docs: add crates.io installation instructions

pkh v0.1.0 is published to crates.io, so cargo install pkh is now the
primary installation path; building from source stays as the
alternative. Drop the 'no distribution channel' notice.

.github/workflows/ci.yml

@@ -3,6 +3,7 @@ name: CI
 on:
   push:
     branches: [ "main", "ci-test" ]
+    tags: [ "v*" ]
   pull_request:
     branches: [ "main" ]
 
@@ -121,3 +122,41 @@ jobs:
           name: snap
           path: ./*.snap
           if-no-files-found: error
+
+  publish:
+    # Publishes the crate to crates.io on a v* tag. Trusted publishing
+    # (OIDC) is GitHub-Actions-only, so authentication goes through a
+    # crates.io API token stored as the CARGO_REGISTRY_TOKEN secret,
+    # scoped to the pkh crate.
+    if: startsWith(github.ref, 'refs/tags/v')
+    needs: build
+    runs-on: ubuntu-latest
+    container:
+      image: ubuntu:26.04
+      options: --privileged --cap-add SYS_ADMIN --security-opt apparmor:unconfined
+    steps:
+    - name: Set up container image
+      run: |
+        apt-get update
+        apt-get install -y nodejs sudo curl wget ca-certificates build-essential
+    - uses: actions/checkout@v6
+    - uses: dtolnay/rust-toolchain@stable
+    - name: Install build dependencies
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y pkg-config libssl-dev libgpg-error-dev libgpgme-dev
+    - name: Check the tag matches the crate version
+      # cargo publish ships whatever version Cargo.toml declares,
+      # regardless of the tag: a mismatch must fail loudly instead of
+      # publishing the wrong version under the release tag.
+      run: |
+        crate_version="$(awk -F'"' '/^version =/{print $2; exit}' Cargo.toml)"
+        tag_version="${GITHUB_REF_NAME#v}"
+        if [ "$crate_version" != "$tag_version" ]; then
+          echo "tag $GITHUB_REF_NAME does not match crate version $crate_version" >&2
+          exit 1
+        fi
+    - name: Publish
+      run: cargo publish
+      env:
+        CARGO_REGISTRY_TOKEN: ${{ secrets.CARGO_REGISTRY_TOKEN }}

.gitignore

@@ -1,2 +1,8 @@
-*.lock
 target
+
+# Local snapcraft builds
+.craft
+parts
+prim
+stage
+*.snap

AGENTS.md

@@ -48,6 +48,8 @@ Rules:
   - `prune`, `package_info` — remaining subcommand modules
   - `context` — build contexts: local, ssh, chroot/schroot, unshare
     (`src/context/`)
+  - `interrupt` — Ctrl+C interception and interrupt-time cleanup
+    (`src/interrupt.rs`)
   - `debian` — Debian format primitives: control, versions, checksums,
     arch (`src/debian/`)
   - `apt`, `launchpad`, `distro_info`, `quirks` — archive/distro

Cargo.toml

@@ -3,6 +3,10 @@ name = "pkh"
 version = "0.1.0"
 edition = "2024"
 authors = ["vhaudiquet"]
+description = "pkh is a packaging helper for Debian/Ubuntu packages"
+license = "MIT OR GPL-2.0-only"
+repository = "https://git.vhaudiquet.fr/vhaudiquet/pkh"
+readme = "README.md"
 
 [dependencies]
 clap = { version = "4.5.51", features = ["cargo"] }
@@ -35,6 +39,8 @@ gpgme = "0.11"
 serde_yaml = "0.9"
 lazy_static = "1.4.0"
 unicode-width = "0.2"
+parking_lot = "0.12"
+suppaftp = "12"
 
 [dev-dependencies]
 test-log = "0.2.19"

LICENSE-GPL

@@ -0,0 +1,338 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The licenses for most software are designed to take away your
+freedom to share and change it.  By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users.  This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it.  (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.)  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
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+
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+
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+a notice placed by the copyright holder saying it may be distributed
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+
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+
+  8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded.  In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+  9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
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+
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+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation.  If the Program does not specify a version number of
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+
+  10. If you wish to incorporate parts of the Program into other free
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+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License along
+    with this program; if not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+    Gnomovision version 69, Copyright (C) year name of author
+    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary.  Here is a sample; alter the names:
+
+  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+  `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+  <signature of Moe Ghoul>, 1 April 1989
+  Moe Ghoul, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs.  If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.

LICENSE-MIT

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2025-2026 Valentin Haudiquet
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -2,6 +2,30 @@
 
 `pkh` is a packaging helper for Debian/Ubuntu packages.
 
+![](.github/pkh.gif)
+
+## Installation
+
+From crates.io:
+
+```
+cargo install pkh
+```
+
+Or build from source (the same system packages are needed either way):
+
+```
+sudo apt install pkg-config libssl-dev libgpg-error-dev libgpgme-dev
+git clone https://git.vhaudiquet.fr/vhaudiquet/pkh.git
+cd pkh
+cargo install --path .
+```
+
+At runtime pkh shells out to the Debian packaging toolchain (git,
+dpkg-dev, quilt, mmdebstrap, lintian, pristine-tar, ...): install the
+ones your workflows use, or build the classic snap from
+`snap/snapcraft.yaml` (`snapcraft pack`), which carries them.
+
 ## Usage and features
 
 ### Basic concepts
@@ -25,12 +49,19 @@ Options:
 Commands and workflows include:
 ```
 Commands:
+  new    Scaffold a new Debian source package (buildable right away)
   pull   Pull a source package from the archive or git
   chlog  Auto-generate changelog entry, editing it, committing it afterwards
   build  Build the source package (into a .dsc)
-  deb    Build the source package into binary package (.deb)
   put    Upload the built source package to a PPA
+  deb    Build the source package into binary package (.deb)
+  lint   Lint the package (lintian wrapper + pkh-native checks)
+  prune  Prune residual pkh build artifacts and caches
   help   Print this message or the help of the given subcommand(s)
+
+Options:
+  -h, --help     Print help
+  -V, --version  Print version
 ```
 
 ### Examples
@@ -66,68 +97,25 @@ That is a lot of different tools and operations. With pkh, the same workflow:
 pkh pull hello # needs -d ubuntu if you are not running Ubuntu
 # Apply the patch to the package
 ...
-pkh commit -m "Applied patch xxx"
+git add debian/patches/xxx.patch
+git commit -m "Applied patch xxx"
 pkh chlog
+git add debian/changelog
+git commit -m "d/changelog"
 # Test that the package builds
 pkh build
 pkh deb
 # Upload the package to a ppa
 pkh put --ppa user/hello_xxx
-# Push previously commited changes
+# Push the commits to your fork
 git push xxx user-fork
 ```
 
-## Roadmap: features needed for 1.0
-
-Basically, wrapping the basic debian workflows.
-Missing features:
-- [ ] `pkh pull`
-  - [x] Obtain package sources from git
-  - [x] Obtain package sources from the archive (fallback)
-  - [x] Obtain package source from PPA (--ppa)
-  - [ ] Obtain a specific version of the package
-  - [x] Fetch the correct git branch for series on Ubuntu
-  - [ ] Try to fetch the correct git branch for series on Debian, or fallback to the archive
-- [ ] `pkh chlog`
-  - [x] Auto-generate changelog entry
-  - [x] Extra flags: backport, non-maintainer upload, no change rebuild, ...
-  - [ ] Commit changelog entry
-- [ ] `pkh build`
-  - [x] Build the source package
-- [ ] `pkh deb`
-  - [x] Build the binary package
-  - [x] Build for a specific architecture
-  - [ ] Three build modes:
-    - [ ] Build locally (discouraged)
-    - [x] Build using unshare chroot, with binary emulation (default)
-    - [x] Cross-compilation
-  - [ ] Async build
-- [ ] `pkh status`
-  - [ ] Show build status
-- [ ] `pkh put`
-  - [x] Upload the source package to a PPA (native SFTP, no `dput` dependency)
-  - [ ] Upload the source package to the archive
-- [ ] `pkh commit`
-  - [ ] Commit the changes to git
-- [ ] `pkh lint`
-  - [ ] Lint the package
-- [ ] `pkh test`
-  - [ ] Run autopkgtest
-  - [ ] Provide options: local (discouraged), chroot, VM?, ppa
-  - [ ] Async test
-
-## Nice-to-have features
-
-- [ ] 'pkh pull'
-  - [ ] Cache the Sources.gz files, to improve speed
-  - [ ] Work in an already downloaded package, to git pull and re-fetch orig tar gz
-- [ ] 'pkh context'
-  - [x] Select, add, remove, list contexts
-  - [x] Context-scoped command execution
-  - [ ] Context-scoped deb and test commands
-  - [ ] Per-architecture contexts
-  - [ ] Per-series contexts
-  - [x] ssh contexts
-  - [ ] docker, lxc contexts?
-  - [ ] context push, context pop: context stack
+## Future improvement ideas
 
+- pull: try to fetch the correct git branch for series on Debian
+- deb: asynchronous build, detachable and monitorable
+- put: allow uploads to Debian or Ubuntu archives
+- test: add 'pkh test' to run autopkgtests
+- pull: cache Sources.gz files to improve speed
+- pull: 'pkh pull' in a package tree should git pull and re-fetch orig tgz

data/distro_info.yml

@@ -28,6 +28,12 @@
 ##                   series (`<series>-updates`, ...). Deliberately not the
 ##                   `pockets` key: that one is the *search order* of pull,
 ##                   where backports must not fold in.
+##   suite_aliases:  the changelog suite names that alias a series
+##                   codename: Debian packages conventionally target
+##                   'unstable' where the series data carries 'sid'.
+##                   Mapped suite name -> series codename; the two
+##                   names identify the same series, and the selector
+##                   offers the aliased entry as '<suite> (<series>)'.
 ##   build_profiles: the vendor's default DEB_BUILD_PROFILES (Ubuntu
 ##                   activates derivative.ubuntu noudeb, Debian none),
 ##                   mirroring what Dpkg::BuildProfiles resolves when the
@@ -47,6 +53,10 @@ dist:
       - updates
       - security
       - proposed-updates
+    # Debian changelogs conventionally target 'unstable'; the series data
+    # knows the same series as 'sid'.
+    suite_aliases:
+      unstable: sid
     sections:
       # Valid Section values for debian/control: the Debian policy section
       # list unioned with the sections observed in the live Ubuntu archive.

data/launchpad.yml

@@ -13,6 +13,9 @@
 ##   ssh_*:        the PPA upload queue, as expanded by dput-ng's
 ##                 ppa:user/ppa profile (ppa.launchpad.net:22, incoming
 ##                 ~<user>/<ppa>)
+##   ftp_*:        the same upload queue over anonymous FTP, dput-ng's
+##                 plain ppa: profile: the transport pkh degrades to
+##                 when the SSH connection itself never comes up
 ##   content_host_template: ppa.launchpadcontent.net serves PPA apt
 ##                 repositories since the 2022 move off ppa.launchpad.net
 ##   git_web_template: Launchpad's CGit mirrors of Ubuntu source packages
@@ -21,6 +24,10 @@
 api_base: https://api.launchpad.net/1.0
 ssh_host: ppa.launchpad.net
 ssh_port: 22
+## The anonymous FTP upload queue dput-ng's plain ppa: profile uses:
+## pkh degrades to it when the SSH connection itself never comes up.
+ftp_host: ppa.launchpad.net
+ftp_port: 21
 incoming_template: "~{owner}/{ppa}"
 content_host_template: https://ppa.launchpadcontent.net/{owner}/{ppa}/ubuntu
 git_web_template: https://git.launchpad.net/ubuntu/+source/{package}

data/quirks.yml

@@ -1,15 +1,47 @@
 # Quirks configuration for package-specific workarounds
 # This file defines package-specific quirks that are applied during pull and deb operations
+#
+# `pull` and `deb` hold one entry per scope: several entries can carry
+# different `series` lists, and every matching entry applies in file
+# order. Entries can be scoped with `series`: an empty list applies to
+# every series, otherwise only the listed ones. Packaging workarounds
+# should carry the series they were verified against so they can be
+# dropped once the upstream packaging catches up.
 
 quirks:
 
+  # The resolute kernels declare `llvm-21-dev` unqualified while their
+  # other llvm pieces are `:native`; the dpkg cross rules then resolve it
+  # against the host architecture, whose dependency closure conflicts with
+  # the `:native` python3. Resolve it against the build architecture
+  # until the control is fixed upstream.
+  linux:
+    deb:
+      - series: [resolute]
+        dependencies:
+          replace:
+            llvm-21-dev: llvm-21-dev:native <!stage1>
+  linux-riscv:
+    deb:
+      - series: [resolute]
+        dependencies:
+          replace:
+            llvm-21-dev: llvm-21-dev:native <!stage1>
+
   # Add more packages and their quirks as needed
   # example-package:
   #   pull:
-  #     method: archive
+  #     - series: [noble]
+  #       package_directory:
+  #         - linux-main
   #   deb:
-  #     extra_dependencies:
-  #       - another-dependency
+  #     - series: [resolute]
+  #       dependencies:
+  #         replace:
+  #           llvm-21-dev: llvm-21-dev:native <!stage1>
+  #     - series: [stonking]
+  #       dependencies:
+  #         replace:
+  #           llvm-22-dev: llvm-22-dev:native <!stage1>
   #       parameters:
   #         key: value
-

data/skill/SKILL.md

@@ -0,0 +1,130 @@
+---
+name: pkh
+description: 'Drive pkh, a Debian/Ubuntu packaging helper: pull source packages, generate changelog entries, build .dsc/.deb, lint, and upload to a PPA. Use it whenever the task touches Debian or Ubuntu packaging: patching an existing package, preparing an SRU, backport or NMU, scaffolding a new .deb, rebuilding for a PPA, or uploading a source package. Trigger on "update the changelog", "package this", or a bare package name, even when the user never mentions Debian.'
+---
+
+# pkh
+
+`pkh` wraps the Debian packaging toolchain (`dch`, `dpkg-buildpackage`,
+`sbuild`, `dpkg-source`, `quilt`, `lintian`, PPA uploads) in one CLI.
+The subcommands share one set of option names, so `-s` always targets
+the series and `--ppa` always names the PPA. Each step also does more
+than the raw tool it replaces: `pull` fetches the orig tarball with the
+source, `chlog` commits the entry it writes, `deb` sets up a chroot and
+installs the build dependencies.
+
+Check the install with `pkh --version`. Each command lists its flags
+with `pkh <command> --help`, so check there instead of guessing. pkh
+shells out to host tools (git, dpkg-dev, quilt, mmdebstrap, lintian,
+pristine-tar, schroot, ...). Install the ones your workflow uses, or
+use the classic snap, which carries them.
+
+## Shared options
+
+| Option | Meaning |
+|---|---|
+| `-d, --dist <dist>` | Target distribution, `debian` or `ubuntu` |
+| `-s, --series <series>` | Target series, for example `resolute` or `noble` |
+| `-v, --version <version>` | Target package version |
+| `-a, --arch <arch>` | Target architecture, for example `amd64` or `riscv64` |
+| `-p, --pocket <pocket>` | Distribution pocket: `updates`, `security`, `proposed` |
+| `--ppa <user/ppa>` | Act on the named PPA |
+
+Defaults come from the host vendor, its development series, and its
+architecture. When the target differs, pass the flags: packaging for
+Ubuntu on a Debian host needs `-d ubuntu`, and a series or architecture
+that differs from the host needs `-s` or `-a`.
+
+## Patch an Ubuntu package
+
+```
+pkh pull hello                     # source and orig tarball; add -d ubuntu off an Ubuntu host
+# edit the package, committing each patch to git
+pkh chlog                          # generates the entry, opens it for editing, commits it
+git add debian/changelog && git commit -m "d/changelog"
+pkh build                          # source package, written next to the tree
+pkh deb                            # binary build in a chroot with build deps installed
+pkh lint                           # lintian plus pkh-native checks
+pkh put --ppa user/hello_xxx       # uploads the .changes file from the build
+git push xxx user-fork             # push the branch to your fork
+```
+
+Run `pkh chlog` and `pkh build` from the root of the source tree; they
+act on the package in the current directory.
+
+## Command reference
+
+- `pkh new [name]` scaffolds a buildable source package. `--lang`
+  picks the build system (`rust`, `python`, `meson`, `cmake`,
+  `autotools`, `go`, `shell`, `makefile`); `--source <PATH>` packages
+  existing sources instead. `--upstream-version` and `--revision` set
+  the version. `--description`, `--homepage`, `--license <SPDX>`,
+  `--command`, `--maintainer "Name <email>"`, and `--depends` fill in
+  the package metadata, with the maintainer defaulting to
+  `DEBFULLNAME`/`DEBEMAIL` and then git config. `--quilt` and
+  `--native` choose the source format; `--orig-from
+  release|git|path|snapshot` and `--orig-path` control the orig
+  tarball. The changelog starts as `UNRELEASED`; `--release` targets
+  `--series` instead. `--defaults` answers every remaining question
+  with its default, which keeps the run non-interactive.
+
+- `pkh pull <package>` fetches a source package from the archive or
+  git. `--archive` skips git. `--ppa user/ppa` and `--repository
+  <suite-url>` pull from a PPA or an external flat repository instead.
+  `-d`, `-s`, `-v`, and `-p` target an exact source.
+
+- `pkh chlog` generates the changelog entry from the commits since the
+  last version tag, opens it for editing, and commits it. `--backport`,
+  `--nmu`, and `--rebuild` apply the matching numbering scheme
+  (`3.1-1ubuntu2~24.04.1`, `1.0-1.1`, `1.0-1build1`); `-v` sets an
+  explicit version instead.
+
+- `pkh build` produces the .dsc. `--orig auto|always|never` controls
+  whether the upload includes the orig tarball; the default, `auto`,
+  includes it only when the upstream version changed.
+
+- `pkh deb` builds the binary packages in an isolated context with the
+  build dependencies installed. `--ppa` (repeatable) adds dependency
+  sources, `--inject <package|.deb>` preinstalls a package, and `-j`
+  caps parallel jobs. `--cross` cross-compiles instead of using
+  qemu-binfmt, but most packages cannot cross-compile, so prefer qemu.
+  Leave `--mode` unset unless you need a specific build context.
+
+- `pkh lint [path]` runs lintian plus the pkh-native checks. `--json`
+  emits a machine-readable report and `--list-tags` prints the native
+  tag catalog. `--fail-on` sets the severities that fail the run
+  (errors by default), `--suppress-tags` ignores tags, `--check` runs a
+  single native check, and `--info`, `--pedantic`, and
+  `--experimental` add detail. `--repack` packs the tree fresh instead
+  of reusing the existing build output.
+
+- `pkh put [changes]` uploads a .changes file to `--ppa user/ppa`.
+  With no argument it uploads the .changes from this package's last
+  build, found next to the source tree. `--force` re-uploads a file
+  that was already uploaded.
+
+- `pkh prune` removes build artifacts and caches. Run it with
+  `--dry-run` first to list them. `--all` also deletes the cached
+  chroot tarballs, which take long to download again, so use it when
+  you need the disk space.
+
+## Notes for agent runs
+
+- Pass `-d`, `-s`, and `-a` whenever the target differs from the host,
+  so runs are reproducible.
+- Keep runs non-interactive. Pass explicit flags, use `pkh new
+  --defaults`, and set `EDITOR` before `pkh chlog` (`EDITOR=true` keeps
+  the generated text). Commands may ask short questions on the
+  terminal; flags avoid most prompts.
+- Pass `RUST_LOG=debug` for pkh's own logs. `--verbose` on `pkh build`
+  and `pkh deb` prints raw tool output instead of the live view.
+- pkh writes the build artifacts (.dsc, .changes, logs) next to the
+  source tree. `pkh put` finds them without arguments, and `pkh prune`
+  removes them again.
+- Run `pkh lint` before `pkh put`. It exits nonzero when findings reach
+  the `--fail-on` level, which defaults to errors.
+- pkh intercepts Ctrl+C, runs its cleanup hooks, and exits with status
+  130. `pkh prune` removes anything left over.
+
+The upstream repository is https://git.vhaudiquet.fr/vhaudiquet/pkh.
+Its README has longer workflow examples.

snap/snapcraft.yaml

@@ -5,9 +5,14 @@ description: |
   pkh aims at wrapping the different debian tools and workflows
   into one tool, that would have the same interface for everything,
   while being smarter at integrating all workflows.
+
+  This snap uses classic confinement and carries the packaging
+  toolchain it drives (dpkg-dev, git, mmdebstrap, lintian, quilt, ...)
+  so it behaves the same on any Debian/Ubuntu host.
+license: MIT OR GPL-2.0-only
 adopt-info: pkh-part
 
-confinement: devmode
+confinement: classic
 
 apps:
     pkh:
@@ -19,24 +24,92 @@ parts:
     source: .
     override-pull: |
       craftctl default
-      craftctl set version=$(git rev-parse --short=11 HEAD)
-      craftctl set grade="devel"
+      # Release metadata comes from the crate, not the git state: a build
+      # of any commit must produce the version the crate declares.
+      craftctl set version="$(awk -F'"' '/^version =/{print $2; exit}' Cargo.toml)"
+      craftctl set grade="stable"
     build-packages:
       - build-essential
+      - file
+      - patchelf
       - pkg-config
       - libssl-dev
       - libgpg-error-dev
       - libgpgme-dev
+    # Host-side tools pkh execs directly. Tools that only run *inside*
+    # the build chroot (dose-builddebcheck, dpkg-cross) are provisioned
+    # there by pkh itself and must not be staged; likewise qemu-user-static
+    # is host binfmt configuration, not a bundled file.
+    #
+    # The apt and dpkg state-owning tools are deliberately excluded below:
+    # they must be the host's (classic mode makes them visible), since a
+    # core24 apt/dpkg managing a newer host's package database is exactly
+    # the version skew classic snaps must avoid. The source-package tools
+    # (dpkg-buildpackage, dpkg-source, ...) are bundled instead.
     stage-packages:
       - libgpgme11t64
       - git
       - curl
+      - gnupg
+      - gpgv
+      - dpkg-dev
+      - quilt
       - pristine-tar
       - mmdebstrap
+      - lintian
+      - fakeroot
       - util-linux
-      - dpkg-dev
+      # mount/umount moved to their own package (split from util-linux)
+      - mount
+      - schroot
+      - openssh-client
+      - tar
+      - xz-utils
+      - bzip2
     stage:
-    - -usr/lib/x86_64-linux-gnu/libicuio.so.74.2
-    - -usr/lib/x86_64-linux-gnu/libicutest.so.74.2
-    - -usr/lib/x86_64-linux-gnu/libicutu.so.74.2
-    - -usr/lib/x86_64-linux-gnu/libicui18n.so.74.2
+    - -usr/bin/apt
+    - -usr/bin/apt-cache
+    - -usr/bin/apt-cdrom
+    - -usr/bin/apt-config
+    - -usr/bin/apt-get
+    - -usr/bin/apt-key
+    - -usr/bin/apt-mark
+    - -usr/lib/*/libapt-*
+    - -usr/lib/*/libicuio*
+    - -usr/lib/*/libicutest*
+    - -usr/lib/*/libicutu*
+    - -usr/lib/*/libicui18n*
+    # update-alternatives does not run at staging time: expose the sysv
+    # fakeroot under the plain name dpkg-buildpackage and pkh exec.
+    override-prime: |
+      craftctl default
+      ln -sfn fakeroot-sysv "${CRAFT_PRIME}/usr/bin/fakeroot"
+      # Ship the license texts with the binary: the MIT grant requires
+      # the notice to accompany copies, and GPL-2 requires the license
+      # text alongside distribution.
+      mkdir -p "${CRAFT_PRIME}/usr/share/doc/pkh"
+      cp "${CRAFT_PART_SRC}/LICENSE-MIT" "${CRAFT_PART_SRC}/LICENSE-GPL" \
+        "${CRAFT_PRIME}/usr/share/doc/pkh/"
+      # Classic-confined ELFs default to the host loader, which pins the
+      # snap to hosts shipping at least the build environment's glibc,
+      # and cannot see the libraries deduplicated against the base.
+      # Point every bundled ELF at the core24 loader and give it an
+      # rpath resolving base libraries from the mounted base and
+      # snap-local libraries from $ORIGIN — the classic linter's
+      # guidance, and what Canonical's own classic snaps do. DT_RPATH
+      # (--force-rpath) is required over the default DT_RUNPATH: the
+      # host ld.so.cache would otherwise resolve sonames to host
+      # libraries first, mixing host libm/libresolv with base libc.
+      # DT_RPATH also propagates transitively, covering dependencies of
+      # dependencies (libgpgme -> libassuan). Host tools spawned later
+      # (host apt-get, ...) run with a pristine environment since no
+      # LD_LIBRARY_PATH is exported.
+      find "${CRAFT_PRIME}" -type f -exec sh -c '
+        for f do
+          [ "$(od -An -N4 -tx1 "$f" | tr -d " \n")" = "7f454c46" ] || continue
+          patchelf --set-interpreter \
+            /snap/core24/current/lib64/ld-linux-x86-64.so.2 "$f" 2>/dev/null || true
+          patchelf --force-rpath --set-rpath \
+            "/snap/core24/current/lib/x86_64-linux-gnu:/snap/core24/current/usr/lib/x86_64-linux-gnu:\$ORIGIN:\$ORIGIN/../lib/x86_64-linux-gnu:\$ORIGIN/../usr/lib/x86_64-linux-gnu" \
+            "$f" 2>/dev/null || true
+        done' sh {} +

src/apt/keyring.rs

@@ -89,24 +89,27 @@ pub async fn download_cache_keyrings(
                     keyring_dir.display()
                 )
             })?;
+            // Upgrade cache directories created by versions that made them
+            // private: mmdebstrap's unshare-mode hooks cannot read them.
         } else {
             // Remote contexts (e.g. ssh) have no stat/metadata access through
             // the context API, so the ownership guard cannot be performed;
             // keep the previous best-effort behavior of tightening the
-            // directory permissions instead (0700 instead of the former
-            // world-writable a+rwx).
-            ctx.command("chmod").arg("700").arg(&keyring_dir).status()?;
+            // directory permissions instead (no group/others write).
         }
+        ctx.command("chmod").arg("755").arg(&keyring_dir).status()?;
     } else {
-        // Create the directory private to the invoking user (0700). This is
-        // sufficient for mmdebstrap in unshare mode: it runs with the same
-        // real uid (the user namespace only maps that uid to root, file
-        // access still happens as the real uid), so no world-accessible
-        // permissions are needed.
+        // Create the directory readable but not writable by group/others.
+        // mmdebstrap's unshare-mode hooks run under an identity that cannot
+        // read the invoking user's private directories, so 0700 breaks the
+        // keyring copy into the chroot; the planting guard stays on the
+        // ownership and no-write checks of validate_keyring_dir (the
+        // skip-if-exists logic below trusts pre-existing keyrings, so the
+        // directory must never be writable by anyone else).
         ctx.command("mkdir")
             .arg("-p")
             .arg("-m")
-            .arg("700")
+            .arg("755")
             .arg(&keyring_dir)
             .status()?;
     }
@@ -178,6 +181,11 @@ pub async fn download_cache_keyrings(
                 binary_path.display()
             );
         }
+
+        // Readable like the directory: mmdebstrap's hooks copy these into
+        // the chroot. Applies to legacy files too, which a restrictive
+        // umask may have left private, and a permissive one group-writable.
+        let _ = ctx.command("chmod").arg("644").arg(&binary_path).status();
     }
 
     log::info!(
@@ -348,6 +356,10 @@ mod tests {
         assert!(validate_keyring_dir(1000, 0o750, 1000).is_ok());
         assert!(validate_keyring_dir(1000, 0o1744, 1000).is_ok());
         assert!(validate_keyring_dir(0, 0o700, 0).is_ok());
+        // The world-readable modes the cache now uses: readable so that
+        // mmdebstrap's unshare-mode hooks can copy the keyrings, while the
+        // ownership and no-write checks keep the planting guard.
+        assert!(validate_keyring_dir(1000, 0o755, 1000).is_ok());
     }
 
     #[test]

src/changelog.rs

@@ -137,7 +137,9 @@ pub async fn generate_entry(
 enum Bump {
     /// Regular upload: increment the trailing number
     Normal,
-    /// Ubuntu upload: `1.0-9` becomes `1.0-9ubuntu1`
+    /// Ubuntu upload: `1.0-9` becomes `1.0-9ubuntu1`; a trailing
+    /// no-change-rebuild marker is dropped first (`1.0-9build1` becomes
+    /// `1.0-9ubuntu1`)
     Ubuntu,
     /// Non-maintainer upload: `1.0-1` becomes `1.0-1.1`, native `1.0`
     /// becomes `1.0+nmu1`
@@ -158,7 +160,7 @@ fn compute_new_version(
     bump: Bump,
 ) -> Result<String, Box<dyn std::error::Error>> {
     match bump {
-        Bump::Ubuntu => increment_suffix(old_version, "ubuntu"),
+        Bump::Ubuntu => increment_suffix(strip_build_suffix(old_version), "ubuntu"),
         Bump::Rebuild => increment_suffix(old_version, "build"),
         Bump::Nmu => {
             if old_version.contains('-') {
@@ -177,6 +179,19 @@ fn compute_new_version(
     }
 }
 
+/// The version an Ubuntu upload is numbered from: a trailing
+/// no-change-rebuild marker is dropped, because a real change on top of a
+/// rebuild replaces the marker rather than appending to it — `X-2build1`
+/// becomes `X-2ubuntu1`, where an appended `X-2build1ubuntu1` would
+/// misrepresent the lineage and sort below `X-2ubuntu1`
+fn strip_build_suffix(version: &str) -> &str {
+    let stem = version.trim_end_matches(|c: char| c.is_ascii_digit());
+    match stem.strip_suffix("build") {
+        Some(base) if stem.len() < version.len() => &version[..base.len()],
+        _ => version,
+    }
+}
+
 /// The version bump a regular ([`EntryKind::Normal`]) upload gets, derived
 /// from the vendor of the target series: Ubuntu series number their uploads
 /// the Ubuntu way (`1.0-1` becomes `1.0-1ubuntu1`), everything else —
@@ -294,9 +309,16 @@ pub enum SeriesCandidates {
     /// cannot be made (cancelled, no interactive user) `fallback` — the
     /// changelog's current series — is used instead.
     Choose {
-        /// Series names to offer.
+        /// Selector labels: each series name, or `<suite> (<series>)`
+        /// for a series aliased by a changelog suite name (Debian's
+        /// 'unstable (sid)').
         options: Vec<String>,
-        /// Preselected series.
+        /// Changelog distribution each label of `options` maps to,
+        /// parallel to it: an aliased label selects its suite name —
+        /// what a changelog distribution field expects — while every
+        /// other label selects itself.
+        values: Vec<String>,
+        /// Preselected label.
         default: String,
         /// Series to fall back to when nothing can be selected.
         fallback: String,
@@ -312,8 +334,10 @@ pub enum SeriesCandidates {
 /// An UNRELEASED entry offers itself as a pinned first option (selecting it
 /// keeps the changelog unreleased) on top of the current vendor's series
 /// list, defaulting to the development series; any other series resolves
-/// through the series list of its own distribution. `None` when the
-/// changelog cannot be parsed (no default to derive at all).
+/// through the series list of its own distribution. A changelog suite name
+/// (Debian's 'unstable') identifies the same series as its alias's codename
+/// ('sid') and resolves to that dist's list. `None` when the changelog
+/// cannot be parsed (no default to derive at all).
 pub async fn series_candidates(changelog_path: &Path) -> Option<SeriesCandidates> {
     let (_package, _version, current) = parse_changelog_header(changelog_path).ok()?;
 
@@ -321,10 +345,13 @@ pub async fn series_candidates(changelog_path: &Path) -> Option<SeriesCandidates
         // Vendors keep original casing ("Ubuntu"), while the series data
         // keys are lowercase
         let dist = crate::build::env::current_vendor().to_lowercase();
-        let mut options = vec![crate::distro_info::UNRELEASED.to_string()];
         match crate::distro_info::get_ordered_series_name(&dist).await {
             Ok(series_list) => {
-                options.extend(series_list);
+                let (labels, series_values, _) = selector_options(&dist, &series_list, "");
+                let mut options = vec![crate::distro_info::UNRELEASED.to_string()];
+                let mut values = vec![crate::distro_info::UNRELEASED.to_string()];
+                options.extend(labels);
+                values.extend(series_values);
                 // Default to the development series (the first real entry),
                 // not to the pinned UNRELEASED entry itself
                 let default = if options.len() > 1 {
@@ -334,6 +361,7 @@ pub async fn series_candidates(changelog_path: &Path) -> Option<SeriesCandidates
                 };
                 Some(SeriesCandidates::Choose {
                     options,
+                    values,
                     default,
                     fallback: current,
                 })
@@ -341,20 +369,79 @@ pub async fn series_candidates(changelog_path: &Path) -> Option<SeriesCandidates
             Err(_) => Some(SeriesCandidates::Keep(current)),
         }
     } else {
-        match crate::distro_info::get_dist_from_series(&current).await {
-            Ok(dist) => match crate::distro_info::get_ordered_series_name(&dist).await {
+        // The changelog may target a suite name instead of a series
+        // codename: Debian conventionally writes 'unstable' where the
+        // series data carries 'sid'. The two identify the same series:
+        // the alias resolves to its codename's dist for the lookup.
+        let resolved = match crate::distro_info::get_dist_from_series(&current).await {
+            Ok(dist) => Some((dist, current.clone())),
+            Err(_) => crate::distro_info::resolve_suite_alias(&current),
+        };
+        match resolved {
+            Some((dist, canonical)) => {
+                match crate::distro_info::get_ordered_series_name(&dist).await {
                     // Even an empty list goes through the selector: its
                     // fallback prints and takes the default, like it always has
-                Ok(options) => Some(SeriesCandidates::Choose {
+                    Ok(series_list) => {
+                        let (options, values, default) =
+                            selector_options(&dist, &series_list, &canonical);
+                        Some(SeriesCandidates::Choose {
                             options,
-                    default: current.clone(),
+                            values,
+                            // A stale alias whose codename left the series
+                            // list offers the raw name instead
+                            default: default.unwrap_or_else(|| canonical.clone()),
                             fallback: current,
-                }),
-                Err(_) => Some(SeriesCandidates::Keep(current)),
-            },
+                        })
+                    }
                     Err(_) => Some(SeriesCandidates::Keep(current)),
                 }
             }
+            None => Some(SeriesCandidates::Keep(current)),
+        }
+    }
+}
+
+/// The selector entries for a dist's series list: (labels, changelog
+/// targets, label of `current`'s entry). A series aliased by a
+/// changelog suite name (Debian's 'unstable' for 'sid') is offered as
+/// `<suite> (<series>)` but targets the suite name — what a changelog
+/// distribution field expects — while every other series is offered,
+/// and targeted, under its own name. `current` may be a name that is
+/// not in the list at all (e.g. UNRELEASED), in which case no default
+/// is returned.
+fn selector_options(
+    dist: &str,
+    series: &[String],
+    current: &str,
+) -> (Vec<String>, Vec<String>, Option<String>) {
+    let mut labels = Vec::with_capacity(series.len());
+    let mut values = Vec::with_capacity(series.len());
+    let mut default = None;
+    for s in series {
+        let (label, value) = match crate::distro_info::series_suite_alias(dist, s) {
+            Some(suite) => (format!("{suite} ({s})"), suite),
+            None => (s.clone(), s.clone()),
+        };
+        if s == current {
+            default = Some(label.clone());
+        }
+        labels.push(label);
+        values.push(value);
+    }
+    (labels, values, default)
+}
+
+/// The changelog distribution a selected series-selector label maps to
+/// ([`SeriesCandidates::Choose`]): an aliased entry ('unstable (sid)')
+/// targets its suite name, any other label targets itself, and a
+/// free-typed series the selector does not offer is its own target.
+pub fn selected_series(options: &[String], values: &[String], selected: String) -> String {
+    options
+        .iter()
+        .position(|o| *o == selected)
+        .and_then(|idx| values.get(idx).cloned())
+        .unwrap_or(selected)
 }
 
 /// Parse a changelog file footer to extract maintainer information
@@ -639,12 +726,18 @@ mod tests {
         match series_candidates(&path).await {
             Some(SeriesCandidates::Choose {
                 options,
+                values,
                 default,
                 fallback,
             }) => {
                 assert_eq!(options[0], "UNRELEASED");
+                assert_eq!(values[0], "UNRELEASED");
                 assert!(options.len() > 1, "the vendor series list is offered");
                 assert_eq!(default, options[1]);
+                assert_eq!(
+                    selected_series(&options, &values, default.clone()),
+                    values[1]
+                );
                 assert_eq!(fallback, "UNRELEASED");
             }
             other => panic!("expected Choose, got {other:?}"),
@@ -677,17 +770,105 @@ mod tests {
         match series_candidates(&path).await {
             Some(SeriesCandidates::Choose {
                 options,
+                values,
                 default,
                 fallback,
             }) => {
-                assert_eq!(options, vendor_series);
-                assert_eq!(default, *current);
+                // The current series is preselected through its label, and
+                // selecting it targets the name the changelog already carries
+                let idx = values
+                    .iter()
+                    .position(|v| v == current)
+                    .expect("the current series is offered");
+                assert_eq!(default, options[idx]);
+                assert_eq!(
+                    selected_series(&options, &values, options[idx].clone()),
+                    *current
+                );
                 assert_eq!(fallback, *current);
             }
             other => panic!("expected Choose, got {other:?}"),
         }
     }
 
+    /// A changelog targeting Debian's 'unstable' suite — the conventional
+    /// Debian development distribution, which the series data knows as the
+    /// codename 'sid' — resolves to the Debian series list: the selector
+    /// offers the aliased entry as 'unstable (sid)', preselected, and
+    /// selecting it targets 'unstable' itself.
+    #[tokio::test]
+    async fn series_candidates_suite_alias_matches_unstable_and_sid() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("changelog");
+        std::fs::write(
+            &path,
+            "hello (1.0-1) unstable; urgency=medium\n\n  * Something.\n\n \
+             -- A B <a@b.c>  Mon, 01 Jan 2024 00:00:00 +0000\n",
+        )
+        .unwrap();
+
+        match series_candidates(&path).await {
+            Some(SeriesCandidates::Choose {
+                options,
+                values,
+                default,
+                fallback,
+            }) => {
+                let idx = options
+                    .iter()
+                    .position(|o| o == "unstable (sid)")
+                    .expect("sid is offered as its suite alias");
+                assert_eq!(values[idx], "unstable");
+                assert_eq!(default, "unstable (sid)");
+                assert_eq!(fallback, "unstable");
+                // Selecting the aliased entry targets the suite name
+                assert_eq!(
+                    selected_series(&options, &values, options[idx].clone()),
+                    "unstable"
+                );
+                // A free-typed series the selector does not offer is its own
+                // target
+                assert_eq!(
+                    selected_series(&options, &values, "trixie".to_string()),
+                    "trixie"
+                );
+            }
+            other => panic!("expected Choose, got {other:?}"),
+        }
+    }
+
+    /// A changelog naming the codename ('sid') resolves to the same
+    /// selector entry as the suite alias ('unstable'): the two identify
+    /// the same series.
+    #[tokio::test]
+    async fn series_candidates_sid_defaults_to_the_suite_alias_label() {
+        let dir = tempfile::tempdir().unwrap();
+        let path = dir.path().join("changelog");
+        std::fs::write(
+            &path,
+            "hello (1.0-1) sid; urgency=medium\n\n  * Something.\n\n \
+             -- A B <a@b.c>  Mon, 01 Jan 2024 00:00:00 +0000\n",
+        )
+        .unwrap();
+
+        match series_candidates(&path).await {
+            Some(SeriesCandidates::Choose {
+                options,
+                values,
+                default,
+                fallback,
+            }) => {
+                assert_eq!(default, "unstable (sid)");
+                assert_eq!(
+                    selected_series(&options, &values, default.clone()),
+                    "unstable"
+                );
+                assert_eq!(fallback, "sid");
+            }
+            other => panic!("expected Choose, got {other:?}"),
+        }
+    }
+
     /// Without a parsable changelog there is no candidate at all.
     #[tokio::test]
     async fn series_candidates_none_without_changelog() {
@@ -973,6 +1154,22 @@ mod tests {
             compute_new_version("15.2.0-9ubuntu1", Bump::Ubuntu).unwrap(),
             "15.2.0-9ubuntu2"
         );
+        // Ubuntu upload on top of a rebuild drops the buildN marker:
+        // appending would give 15.2.0-9build1ubuntu1, which sorts below
+        // the proper 15.2.0-9ubuntu1
+        assert_eq!(
+            compute_new_version("15.2.0-9build1", Bump::Ubuntu).unwrap(),
+            "15.2.0-9ubuntu1"
+        );
+        assert_eq!(
+            compute_new_version("15.2.0-9ubuntu1build1", Bump::Ubuntu).unwrap(),
+            "15.2.0-9ubuntu2"
+        );
+        // Native packages
+        assert_eq!(
+            compute_new_version("15.2.0build1", Bump::Ubuntu).unwrap(),
+            "15.2.0ubuntu1"
+        );
 
         // No change rebuild
         assert_eq!(
@@ -1229,6 +1426,38 @@ mod tests {
         assert_eq!(entry.new_version, "1.0-1ubuntu2");
     }
 
+    /// An Ubuntu upload of a package whose changelog carries a rebuild
+    /// version drops the buildN marker: 1.0-1build1 numbers the next entry
+    /// 1.0-1ubuntu1 (1.0-1build1ubuntu1 would sort below 1.0-1ubuntu1).
+    /// Relies on the host distro-info data listing noble (see the
+    /// distro_info tests). The git repo provides the maintainer identity:
+    /// DEBFULLNAME/DEBEMAIL are process-global and other tests mutate them
+    /// in parallel.
+    #[tokio::test]
+    async fn test_generate_entry_ubuntu_series_numbering_after_rebuild() {
+        let temp_dir = TempDir::new().unwrap();
+        let repo_dir = temp_dir.path();
+        setup_repo(repo_dir);
+        let changelog_path = repo_dir.join("debian/changelog");
+        std::fs::create_dir_all(repo_dir.join("debian")).unwrap();
+        std::fs::write(
+            &changelog_path,
+            "mypackage (1.0-1build1) noble; urgency=medium\n\n  * Initial release\n\n -- Maintainer <m@e.com>  Wed, 01 Jan 2020 00:00:00 +0000\n",
+        )
+        .unwrap();
+
+        let entry = generate_entry(
+            "debian/changelog",
+            Some(repo_dir),
+            None,
+            Some("noble"),
+            EntryKind::Normal,
+        )
+        .await
+        .unwrap();
+        assert_eq!(entry.new_version, "1.0-1ubuntu1");
+    }
+
     #[test]
     fn test_get_maintainer_info() {
         let _identity = IDENTITY_LOCK.blocking_lock();

src/context/api.rs

@@ -70,6 +70,12 @@ pub trait ContextDriver {
     fn read_file(&self, path: &Path) -> io::Result<String>;
     fn write_file(&self, path: &Path, content: &str) -> io::Result<()>;
     fn exists(&self, path: &Path) -> io::Result<bool>;
+    /// Check if a path is a directory inside the context
+    ///
+    /// Distinct from [`ContextDriver::exists`] because paths returned by
+    /// [`ContextDriver::list_files`] are context-relative and can only be
+    /// classified through the context, never with a host-side stat.
+    fn is_dir(&self, path: &Path) -> io::Result<bool>;
 
     /// Clean up any resources held by the driver (e.g. unmount overlay filesystems).
     /// Called before the chroot directory is removed.
@@ -243,12 +249,22 @@ impl Context {
     }
 
     /// Make a command inside context
+    ///
+    /// Build tooling must not inherit the session's locale: dpkg-family
+    /// tools and perl-based packaging scripts change their output (and
+    /// dpkg-buildpackage treats some of it as data) with the environment,
+    /// and a translated or mixed locale leaks host state into builds. The
+    /// C locale is the default; a caller can still override it by setting
+    /// LANG/LC_ALL through [`ContextCommand::envs`] afterwards.
     pub fn command<S: AsRef<OsStr>>(&self, program: S) -> ContextCommand<'_> {
         ContextCommand {
             context: self,
             program: program.as_ref().to_string_lossy().to_string(),
             args: Vec::new(),
-            env: Vec::new(),
+            env: vec![
+                ("LANG".to_string(), "C".to_string()),
+                ("LC_ALL".to_string(), "C".to_string()),
+            ],
             cwd: None,
             sink: None,
         }
@@ -303,6 +319,15 @@ impl Context {
         self.driver().as_ref().unwrap().exists(path)
     }
 
+    /// Check if a path is a directory inside context
+    ///
+    /// Paths returned by [`Context::list_files`] are context-relative
+    /// (e.g. rooted inside the chroot for an unshare context): whether they
+    /// are directories can only be decided through the context.
+    pub fn is_dir(&self, path: &Path) -> io::Result<bool> {
+        self.driver().as_ref().unwrap().is_dir(path)
+    }
+
     /// Clean up any resources held by the driver (e.g. unmount overlay filesystems).
     /// Called before the chroot directory is removed.
     pub fn cleanup(&self) -> io::Result<()> {
@@ -530,4 +555,31 @@ mod endpoint_tests {
         let err = ContextConfig::from_endpoint("host:99999").unwrap_err();
         assert_eq!(err, "Invalid port number");
     }
+
+    /// Commands run in the C locale whatever the session environment
+    /// carries: host locale variables must not leak into builds. An
+    /// explicit caller override still wins.
+    #[test]
+    fn commands_default_to_the_c_locale() {
+        let ctx = Context::new(ContextConfig::Local).unwrap();
+
+        let locale = ctx
+            .command("sh")
+            .arg("-c")
+            .arg("printf '%s' \"${LC_ALL:-unset}:${LANG:-unset}\"")
+            .output()
+            .unwrap()
+            .stdout;
+        assert_eq!(String::from_utf8_lossy(&locale), "C:C");
+
+        let locale = ctx
+            .command("sh")
+            .arg("-c")
+            .arg("printf '%s' \"$LC_ALL\"")
+            .env("LC_ALL", "C.UTF-8")
+            .output()
+            .unwrap()
+            .stdout;
+        assert_eq!(String::from_utf8_lossy(&locale), "C.UTF-8");
+    }
 }

src/context/local.rs

@@ -24,33 +24,31 @@ impl ContextDriver for LocalDriver {
     }
 
     fn create_temp_dir(&self) -> io::Result<String> {
-        // Generate a unique temporary directory name with random string
+        // Sub-second precision and an atomic create: two concurrent
+        // contexts racing on the same name must never share a directory,
+        // so the loser of a create falls through to the next attempt
+        // instead of probing for existence first (a probe-then-create
+        // window loses exactly when two callers arrive together).
         let base_timestamp = SystemTime::now()
             .duration_since(SystemTime::UNIX_EPOCH)
             .unwrap()
-            .as_secs();
+            .as_millis();
 
         let mut attempt = 0;
         loop {
             let work_dir_name = if attempt == 0 {
-                format!("pkh-{}", base_timestamp)
+                format!("pkh-{base_timestamp}")
             } else {
-                format!("pkh-{}-{}", base_timestamp, attempt)
+                format!("pkh-{base_timestamp}-{attempt}")
             };
 
             let temp_dir_path = std::env::temp_dir().join(&work_dir_name);
 
-            // Check if directory already exists
-            if temp_dir_path.exists() {
-                attempt += 1;
-                continue;
+            match std::fs::create_dir(&temp_dir_path) {
+                Ok(()) => return Ok(temp_dir_path.to_string_lossy().to_string()),
+                Err(e) if e.kind() == io::ErrorKind::AlreadyExists => attempt += 1,
+                Err(e) => return Err(e),
             }
-
-            // Create the directory
-            std::fs::create_dir_all(&temp_dir_path)?;
-
-            // Return the path as a string
-            return Ok(temp_dir_path.to_string_lossy().to_string());
         }
     }
 
@@ -157,6 +155,10 @@ impl ContextDriver for LocalDriver {
     fn exists(&self, path: &Path) -> io::Result<bool> {
         Ok(path.exists())
     }
+
+    fn is_dir(&self, path: &Path) -> io::Result<bool> {
+        Ok(path.is_dir())
+    }
 }
 
 fn copy_dir_recursive(src: &Path, dest: &Path) -> io::Result<()> {
@@ -190,3 +192,39 @@ fn copy_dir_recursive(src: &Path, dest: &Path) -> io::Result<()> {
     }
     Ok(())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// Concurrent callers must never share a temporary directory: the
+    /// create is atomic, so a lost race falls through to the next name
+    /// instead of both callers probing the same free name and unpacking
+    /// into the same directory.
+    #[test]
+    fn create_temp_dir_is_unique_under_concurrency() {
+        const CALLERS: usize = 8;
+        let (tx, rx) = std::sync::mpsc::channel();
+        let handles: Vec<_> = (0..CALLERS)
+            .map(|_| {
+                let tx = tx.clone();
+                std::thread::spawn(move || {
+                    let dir = LocalDriver.create_temp_dir().unwrap();
+                    tx.send(dir).unwrap();
+                })
+            })
+            .collect();
+        for handle in handles {
+            handle.join().unwrap();
+        }
+        drop(tx);
+
+        let mut names: Vec<String> = rx.iter().collect();
+        names.sort();
+        let unique: std::collections::BTreeSet<&String> = names.iter().collect();
+        assert_eq!(names.len(), unique.len(), "duplicate temp dirs: {names:?}");
+        for name in &unique {
+            std::fs::remove_dir(name).unwrap();
+        }
+    }
+}

src/context/mod.rs

@@ -385,6 +385,40 @@ mod tests {
         assert!(!dest.join("src/.svn").exists());
     }
 
+    /// The unshare driver maps context-relative paths onto the chroot root
+    /// on the host: `is_dir` must answer through that mapping (a host-side
+    /// stat of the unmapped path sees nothing), which is what lets the deb
+    /// package-directory search classify staged entries.
+    #[test]
+    fn test_unshare_is_dir_maps_through_the_chroot_root() {
+        let chroot = tempfile::tempdir().unwrap();
+        fs::create_dir_all(chroot.path().join("tmp/work/tree/debian")).unwrap();
+        fs::write(chroot.path().join("tmp/work/orig.tar.xz"), "tar").unwrap();
+
+        let base = Context::new(ContextConfig::Local).unwrap();
+        let ctx = Context::with_parent(
+            ContextConfig::Unshare {
+                path: chroot.path().to_string_lossy().to_string(),
+                parent: None,
+            },
+            Arc::new(base),
+        );
+
+        assert!(ctx.is_dir(std::path::Path::new("/tmp/work/tree")).unwrap());
+        assert!(
+            ctx.exists(std::path::Path::new("/tmp/work/tree/debian"))
+                .unwrap()
+        );
+        assert!(
+            !ctx.is_dir(std::path::Path::new("/tmp/work/orig.tar.xz"))
+                .unwrap()
+        );
+        assert!(
+            !ctx.exists(std::path::Path::new("/tmp/work/missing"))
+                .unwrap()
+        );
+    }
+
     /// The overlay-mount path exposes the tree verbatim, so pruning happens
     /// after the fact: nested VCS metadata must be removed recursively.
     #[test]

src/context/schroot.rs

@@ -296,6 +296,16 @@ impl ContextDriver for SchrootDriver {
         )?;
         Ok(status.success())
     }
+
+    fn is_dir(&self, path: &Path) -> io::Result<bool> {
+        let status = self.run(
+            "test",
+            &["-d".to_string(), path.to_string_lossy().to_string()],
+            &[],
+            None,
+        )?;
+        Ok(status.success())
+    }
 }
 
 #[cfg(test)]

src/context/ssh.rs

@@ -306,6 +306,14 @@ impl ContextDriver for SshDriver {
             Err(_) => Ok(false),
         }
     }
+
+    fn is_dir(&self, path: &Path) -> io::Result<bool> {
+        let sess = connect_ssh(&self.host, self.user.as_deref(), self.port)?;
+        let sftp = sess.sftp().map_err(io::Error::other)?;
+        // Same error tolerance as `exists`: an unreachable path is not a
+        // directory, and the caller decides what absence means.
+        Ok(sftp.stat(path).map(|stat| stat.is_dir()).unwrap_or(false))
+    }
 }
 
 impl SshDriver {

src/context/unshare.rs

@@ -296,36 +296,40 @@ impl ContextDriver for UnshareDriver {
 
     fn create_temp_dir(&self) -> io::Result<String> {
         // Create a temporary directory inside the chroot with unique naming
+        // Sub-second precision and an atomic create, like the local
+        // driver: concurrent callers racing on the same name must not
+        // share a directory, so an existing target falls through to the
+        // next attempt instead of a probe-then-create window.
         let base_timestamp = std::time::SystemTime::now()
             .duration_since(std::time::UNIX_EPOCH)
             .unwrap()
-            .as_secs();
+            .as_millis();
 
         let mut attempt = 0;
         loop {
             let work_dir_name = if attempt == 0 {
-                format!("pkh-build-{}", base_timestamp)
+                format!("pkh-build-{base_timestamp}")
             } else {
-                format!("pkh-build-{}-{}", base_timestamp, attempt)
+                format!("pkh-build-{base_timestamp}-{attempt}")
             };
 
-            let work_dir_inside_chroot = format!("/tmp/{}", work_dir_name);
+            let work_dir_inside_chroot = format!("/tmp/{work_dir_name}");
             let host_path = Path::new(&self.path).join("tmp").join(&work_dir_name);
 
-            // Check if directory already exists
-            if host_path.exists() {
-                attempt += 1;
-                continue;
-            }
-
-            // Create the directory on the host filesystem
-            std::fs::create_dir_all(&host_path)?;
-
+            match std::fs::create_dir(&host_path) {
+                Ok(()) => {
                     debug!(
                         "Created work directory: {} (host: {})",
                         work_dir_inside_chroot,
                         host_path.display()
                     );
+                }
+                Err(e) if e.kind() == io::ErrorKind::AlreadyExists => {
+                    attempt += 1;
+                    continue;
+                }
+                Err(e) => return Err(e),
+            }
 
             // Return the path as it appears inside the chroot
             return Ok(work_dir_inside_chroot);
@@ -352,6 +356,11 @@ impl ContextDriver for UnshareDriver {
         let host_path = Path::new(&self.path).join(path.to_string_lossy().trim_start_matches('/'));
         self.parent().exists(&host_path)
     }
+
+    fn is_dir(&self, path: &Path) -> io::Result<bool> {
+        let host_path = Path::new(&self.path).join(path.to_string_lossy().trim_start_matches('/'));
+        Ok(host_path.is_dir())
+    }
 }
 
 impl UnshareDriver {

src/deb/ephemeral.rs

@@ -1,139 +1,24 @@
 use crate::context::{self, Context, ContextConfig};
 use crate::deb::{Phase, enter_phase};
+use crate::interrupt::CleanupHookGuard;
 use crate::report::BuildView;
 use directories::ProjectDirs;
-use std::any::Any;
 use std::error::Error;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
 use std::sync::Arc;
-use std::sync::Mutex;
-use std::sync::atomic::{AtomicU64, Ordering};
-use std::time::Duration;
 use tar::Archive;
 use xz2::read::XzDecoder;
 
-// ---------------------------------------------------------------------------
-// Process-global cleanup hooks
-//
-// On Ctrl-C, the SIGINT handler in `ui::deb` restores the terminal and then
-// `libc::_exit(130)`s, skipping all destructors — including
-// [`EphemeralContextGuard::drop`] — which leaks the freshly bootstrapped
-// chroot under /tmp together with its bind-mounted /proc and any overlayfs
-// mounts. To make interrupt-time cleanup possible anyway, resources register
-// a self-contained cleanup hook here; the SIGINT handler drains and runs the
-// registry right before exiting.
-// ---------------------------------------------------------------------------
-
-/// A boxed, send-safe cleanup hook body
-type CleanupFn = Box<dyn Fn() + Send>;
-
-/// A pending cleanup hook together with its registry id
-struct CleanupHook {
-    id: u64,
-    f: CleanupFn,
-}
-
-/// Registry of cleanup hooks waiting to run at interrupt time
-static CLEANUP_HOOKS: Mutex<Vec<CleanupHook>> = Mutex::new(Vec::new());
-
-/// Source of the registry ids used to deregister a specific hook
-static NEXT_CLEANUP_HOOK_ID: AtomicU64 = AtomicU64::new(1);
-
-/// Register a hook to be run by [`run_cleanup_hooks`] (i.e. when the process
-/// is interrupted), returning a guard whose drop deregisters the hook again
-fn register_cleanup_hook(f: CleanupFn) -> CleanupHookGuard {
-    let id = NEXT_CLEANUP_HOOK_ID.fetch_add(1, Ordering::Relaxed);
-    CLEANUP_HOOKS.lock().unwrap().push(CleanupHook { id, f });
-    CleanupHookGuard(id)
-}
-
-/// RAII handle to a registered cleanup hook: dropping it (or an explicit
-/// [`CleanupHookGuard::deregister`]) removes the hook from the registry so
-/// the interrupt path can no longer run it
-struct CleanupHookGuard(u64);
-
-impl CleanupHookGuard {
-    /// Registry id of the hook (used to filter the registry in tests)
-    #[cfg(test)]
-    fn id(&self) -> u64 {
-        self.0
-    }
-
-    /// Remove the hook from the registry; returns whether it was still pending
-    fn deregister(&mut self) -> bool {
-        deregister_cleanup_hook(self.0)
-    }
-}
-
-impl Drop for CleanupHookGuard {
-    fn drop(&mut self) {
-        deregister_cleanup_hook(self.0);
-    }
-}
-
-/// Remove a hook from the registry; returns whether it was still pending
-fn deregister_cleanup_hook(id: u64) -> bool {
-    let mut hooks = CLEANUP_HOOKS.lock().unwrap();
-    let len_before = hooks.len();
-    hooks.retain(|hook| hook.id != id);
-    hooks.len() != len_before
-}
-
-/// Drain and run every registered cleanup hook exactly once
-///
-/// Called from the SIGINT handler right before the process exits. Draining
-/// uses `try_lock` with a bounded retry instead of a blocking lock: if the
-/// signal interrupted the main thread while it held [`CLEANUP_HOOKS`] (inside
-/// register/deregister), blocking on the same non-recursive mutex from the
-/// handler would deadlock the process. Timing out therefore skips cleanup
-/// (leaking, as before this registry existed) rather than hanging.
-pub(crate) fn run_cleanup_hooks() {
-    run_drained_hooks(drain_cleanup_hooks());
-}
-
-/// Take every pending hook out of the registry, waiting at most ~1s for the
-/// registry lock (see [`run_cleanup_hooks`] for why this must not block forever)
-fn drain_cleanup_hooks() -> Vec<CleanupHook> {
-    const RETRIES: usize = 200;
-    const RETRY_DELAY: Duration = Duration::from_millis(5);
-
-    for _ in 0..RETRIES {
-        if let Ok(mut hooks) = CLEANUP_HOOKS.try_lock() {
-            return std::mem::take(&mut *hooks);
-        }
-        std::thread::sleep(RETRY_DELAY);
-    }
-    log::error!("Timed out waiting for the cleanup hook registry; skipping interrupt cleanup");
-    Vec::new()
-}
-
-/// Run drained hooks one by one, isolating panics so that one failing hook
-/// cannot skip the remaining ones
-fn run_drained_hooks(hooks: Vec<CleanupHook>) {
-    for CleanupHook { id, f } in hooks {
-        // Hooks are arbitrary user code; assert unwind safety so they can be
-        // run inside a catching context
-        if let Err(panic) = std::panic::catch_unwind(std::panic::AssertUnwindSafe(f)) {
-            log::error!("Cleanup hook {id} panicked: {}", panic_message(&panic));
-        }
-    }
-}
-
-/// Best-effort message extraction from a panic payload
-fn panic_message(panic: &(dyn Any + Send)) -> String {
-    if let Some(s) = panic.downcast_ref::<&str>() {
-        (*s).to_string()
-    } else if let Some(s) = panic.downcast_ref::<String>() {
-        s.clone()
-    } else {
-        "non-string panic payload".to_string()
-    }
-}
-
 // ---------------------------------------------------------------------------
 // Interrupt-time chroot cleanup
+//
+// On Ctrl-C, the watchdog in `crate::interrupt` runs the hook registered in
+// [`EphemeralContextGuard::new_with_context`] right before exiting — the
+// interrupt sequence skips all destructors, which would otherwise leak the
+// freshly bootstrapped chroot under /tmp together with its bind-mounted
+// /proc and any overlayfs mounts.
 // ---------------------------------------------------------------------------
 
 /// Interrupt-time cleanup of an ephemeral chroot: unmount every host-side
@@ -143,9 +28,9 @@ fn panic_message(panic: &(dyn Any + Send)) -> String {
 /// Unlike [`EphemeralContextGuard::drop`], this deliberately does NOT go
 /// through the context manager, the ephemeral context's driver (whose
 /// `cleanup()` unmounts the tracked overlays) or the base context's command
-/// builder: the signal may arrive while the interrupted thread holds any of
-/// those mutexes, and re-locking them from the signal handler would deadlock.
-/// Instead it only reads /proc/mounts and spawns umount/rm directly.
+/// builder: interrupt-time hooks must be self-contained, and those
+/// machineries may be mid-mutation on the interrupted thread. Instead it
+/// only reads /proc/mounts and spawns umount/rm directly.
 ///
 /// It also differs from `drop` in that it removes the chroot regardless of
 /// the build result: the build was aborted, and leaving a still-mounted
@@ -175,31 +60,48 @@ fn sigint_cleanup_chroot(chroot_path: &Path) {
         }
     }
 
-    // Remove the chroot tree itself (tolerates a missing directory)
-    let status = privileged_command("rm", is_root)
+    // Remove the chroot tree itself (tolerates a missing directory). A
+    // child the Ctrl+C interrupted may still be finishing its writeout —
+    // dpkg defers SIGINT until it reaches a safe state — so retry while rm
+    // reports the tree non-empty instead of leaving it half-removed.
+    const RETRIES: usize = 10;
+    const RETRY_DELAY: std::time::Duration = std::time::Duration::from_millis(300);
+    let mut last = None;
+    for attempt in 0..=RETRIES {
+        if attempt > 0 {
+            std::thread::sleep(RETRY_DELAY);
+        }
+        last = Some(
+            privileged_command("rm", is_root)
                 .arg("-rf")
                 .arg(chroot_path)
-        .status();
-    match status {
-        Ok(status) if status.success() => {
+                .status(),
+        );
+        if matches!(&last, Some(Ok(status)) if status.success()) {
+            break;
+        }
+    }
+    match last {
+        Some(Ok(status)) if status.success() => {
             log::debug!(
                 "Removed chroot {} during interrupt cleanup",
                 chroot_path.display()
             );
         }
-        Ok(status) => {
+        Some(Ok(status)) => {
             log::error!(
                 "Failed to remove chroot {} during interrupt cleanup \
                  (rm exited with {status}); run `pkh prune`",
                 chroot_path.display()
             );
         }
-        Err(e) => {
+        Some(Err(e)) => {
             log::error!(
                 "Failed to run rm for chroot {} during interrupt cleanup: {e}; run `pkh prune`",
                 chroot_path.display()
             );
         }
+        None => unreachable!("at least one rm attempt ran"),
     }
 }
 
@@ -334,15 +236,14 @@ impl EphemeralContextGuard {
 
         // Register the interrupt-time cleanup hook before any heavy work: if
         // the user hits Ctrl-C during bootstrap or the build itself, the
-        // SIGINT handler unmounts and removes the chroot through this hook
-        // (see `sigint_cleanup_chroot`). This only works for a local base
-        // context: the hook must be self-contained (stored path + direct
-        // umount/rm subprocesses) and cannot go through `base_ctx`, whose
-        // driver mutex may be held by the interrupted thread. For remote or
-        // nested bases the chroot lives elsewhere, and leftovers stay
-        // handled by `pkh prune` as before.
+        // interrupt watchdog unmounts and removes the chroot through this
+        // hook (see `sigint_cleanup_chroot`). This only works for a local
+        // base context: the hook must be self-contained (stored path +
+        // direct umount/rm subprocesses) and cannot go through `base_ctx`.
+        // For remote or nested bases the chroot lives elsewhere, and
+        // leftovers stay handled by `pkh prune` as before.
         let cleanup_hook = if matches!(base_ctx.config, ContextConfig::Local) {
-            Some(register_cleanup_hook(Box::new({
+            Some(crate::interrupt::register_cleanup_hook(Box::new({
                 let chroot_path = chroot_path.clone();
                 move || sigint_cleanup_chroot(&chroot_path)
             })))
@@ -359,10 +260,18 @@ impl EphemeralContextGuard {
             Self::download_and_extract_chroot(series, arch, &chroot_path, base_ctx.clone(), view)
                 .await
         {
-            // The guard (and its Drop) never materializes on this path, so
-            // stop tracking the chroot for interrupt cleanup; as before, a
-            // failed bootstrap leaves its partial directory in place.
+            // On a Ctrl+C the interrupt watchdog owns the tree: keep the
+            // hook registered (forgetting the guard) so it removes the
+            // partial directory, instead of the historical behavior of
+            // leaving it in place. Without an interrupt this is a plain
+            // bootstrap failure and the partial directory stays, as before.
+            if crate::interrupt::interrupted()
+                && let Some(hook) = cleanup_hook
+            {
+                std::mem::forget(hook);
+            } else {
                 drop(cleanup_hook);
+            }
             return Err(e);
         }
 
@@ -437,6 +346,11 @@ impl EphemeralContextGuard {
         let poll_interval = 5; // Check every 5 seconds
 
         while ctx.exists(&lockfile_path)? {
+            // Stop waiting on a Ctrl+C: the interrupt watchdog removes the
+            // (yet empty) chroot and exits without waiting for the poll
+            if crate::interrupt::interrupted() {
+                return Err("Interrupted while waiting for the chroot tarball".into());
+            }
             if wait_time >= timeout {
                 log::warn!(
                     "Lockfile {} exists and has been present for more than {} seconds. \
@@ -585,6 +499,11 @@ impl EphemeralContextGuard {
         // too expensive for multi-hundred-MB chroot tarballs)
         let mut count = 0usize;
         for entry in archive.entries()? {
+            // Bail on a Ctrl+C before the interrupt watchdog's rm -rf races
+            // this loop writing entries into the tree being removed
+            if crate::interrupt::interrupted() {
+                return Err("Interrupted while extracting the chroot".into());
+            }
             let mut entry = entry?;
             entry.unpack_in(chroot_path)?;
             count += 1;
@@ -702,6 +621,20 @@ impl EphemeralContextGuard {
 
 impl Drop for EphemeralContextGuard {
     fn drop(&mut self) {
+        // On Ctrl+C the interrupt watchdog owns the chroot teardown through
+        // the registered hook: duplicating it here would race the hook's
+        // umount/rm (mounts vanish under each other). Dropping this guard
+        // would normally deregister the hook, so while the watchdog runs it
+        // must be leaked instead to keep it registered (if it was already
+        // drained, forgetting is a harmless no-op).
+        if crate::interrupt::interrupted() {
+            context::manager().set_current_ephemeral(self.previous_context.clone());
+            if let Some(hook) = self.cleanup_hook.take() {
+                std::mem::forget(hook);
+            }
+            return;
+        }
+
         // Deregister the interrupt-time cleanup hook first: the normal
         // cleanup below takes care of the chroot, so the hook must not fire
         // afterwards. (If a SIGINT arrived mid-drop and the hook is already
@@ -799,132 +732,8 @@ impl Drop for EphemeralContextGuard {
 }
 
 #[cfg(test)]
-mod cleanup_registry_tests {
+mod chroot_cleanup_tests {
     use super::*;
-    use std::sync::atomic::AtomicUsize;
-
-    /// Serializes these tests: they drain the process-global registry, and
-    /// unrelated tests (e.g. live end-to-end builds) may hold registrations
-    /// concurrently that must be neither run nor lost. Poison-proof: a test
-    /// failing while holding the lock must not cascade into the others.
-    static TEST_LOCK: Mutex<()> = Mutex::new(());
-
-    fn test_lock() -> std::sync::MutexGuard<'static, ()> {
-        TEST_LOCK
-            .lock()
-            .unwrap_or_else(std::sync::PoisonError::into_inner)
-    }
-
-    /// Drain the registry and take out only the hooks with the given ids,
-    /// putting everything else back so unrelated registrations (e.g. hooks of
-    /// live end-to-end builds running concurrently) stay pending
-    fn take_hooks(ids: &[u64]) -> Vec<CleanupHook> {
-        let drained = drain_cleanup_hooks();
-        let mut mine = Vec::new();
-        let mut others = Vec::new();
-        for hook in drained {
-            if ids.contains(&hook.id) {
-                mine.push(hook);
-            } else {
-                others.push(hook);
-            }
-        }
-        CLEANUP_HOOKS.lock().unwrap().extend(others);
-        mine
-    }
-
-    /// Register a hook that counts its invocations
-    fn counting_hook() -> (CleanupHookGuard, Arc<AtomicUsize>) {
-        let counter = Arc::new(AtomicUsize::new(0));
-        let seen = counter.clone();
-        let guard = register_cleanup_hook(Box::new(move || {
-            seen.fetch_add(1, Ordering::SeqCst);
-        }));
-        (guard, counter)
-    }
-
-    /// Hooks run in registration order, and draining means each hook runs
-    /// exactly once even across repeated cleanup passes.
-    #[test]
-    fn hooks_run_once_in_registration_order() {
-        let _serial = test_lock();
-
-        let log = Arc::new(Mutex::new(Vec::new()));
-        let mut guards = Vec::new();
-        let mut ids = Vec::new();
-        for name in ["hook-a", "hook-b", "hook-c"] {
-            let log = log.clone();
-            // The returned guard must stay alive: dropping it deregisters
-            let guard = register_cleanup_hook(Box::new(move || log.lock().unwrap().push(name)));
-            ids.push(guard.id());
-            guards.push(guard);
-        }
-
-        // Only our own hooks are extracted; they run in registration order
-        let mine = take_hooks(&ids);
-        assert_eq!(mine.len(), ids.len());
-        run_drained_hooks(mine);
-        assert_eq!(*log.lock().unwrap(), vec!["hook-a", "hook-b", "hook-c"]);
-
-        // Draining removed them: a second pass runs nothing again
-        assert!(take_hooks(&ids).is_empty());
-        assert_eq!(*log.lock().unwrap(), vec!["hook-a", "hook-b", "hook-c"]);
-
-        drop(guards);
-    }
-
-    /// A panicking hook is contained by the runner: it neither aborts the
-    /// process nor skips the hooks registered around it.
-    #[test]
-    fn panicking_hook_does_not_skip_the_others() {
-        let _serial = test_lock();
-        // The hook below panics on purpose: do not record it as a test
-        // failure in the end-of-run matrix
-        let _quiet = crate::test_support::suppress_failure_recording();
-
-        let (before, ran_before) = counting_hook();
-        let boom = register_cleanup_hook(Box::new(|| panic!("cleanup exploded")));
-        let (after, ran_after) = counting_hook();
-
-        let ids = [before.id(), boom.id(), after.id()];
-        run_drained_hooks(take_hooks(&ids));
-
-        assert_eq!(ran_before.load(Ordering::SeqCst), 1);
-        assert_eq!(ran_after.load(Ordering::SeqCst), 1);
-    }
-
-    /// Explicit deregistration removes the hook: it is no longer drained and
-    /// never runs; a second deregistration reports it as already gone.
-    #[test]
-    fn deregistered_hook_never_runs() {
-        let _serial = test_lock();
-
-        let (mut guard, ran) = counting_hook();
-
-        assert!(guard.deregister());
-        assert!(!guard.deregister());
-
-        assert!(take_hooks(&[guard.id()]).is_empty());
-        assert_eq!(ran.load(Ordering::SeqCst), 0);
-    }
-
-    /// Dropping the registration guard deregisters the hook implicitly.
-    #[test]
-    fn dropping_the_guard_deregisters_the_hook() {
-        let _serial = test_lock();
-
-        let id;
-        let ran;
-        {
-            let (guard, counter) = counting_hook();
-            id = guard.id();
-            ran = counter;
-            drop(guard);
-        }
-
-        assert!(take_hooks(&[id]).is_empty());
-        assert_eq!(ran.load(Ordering::SeqCst), 0);
-    }
 
     /// /proc/mounts path fields use octal escapes for whitespace and
     /// backslashes; anything else must be kept verbatim.

src/deb/local.rs

@@ -5,13 +5,15 @@ use crate::deb::{Phase, enter_phase, find_dsc_file};
 use crate::logfmt::QuiltClassifier;
 use crate::report::BuildView;
 use log::warn;
-use std::collections::{BTreeMap, HashMap};
+use std::collections::{BTreeMap, BTreeSet, HashMap};
 use std::error::Error;
 use std::path::{Path, PathBuf};
 use std::sync::Arc;
 
 use crate::apt;
 use crate::deb::cross;
+use crate::debian::control::ControlInfo;
+use crate::debian::deps::{Deps, Facts, ParseOpts, PkgRelation};
 
 /// Attach the capture sink to a command when the live UI is active
 fn cap<'a>(
@@ -32,6 +34,7 @@ pub async fn build(
     series: &str,
     pocket: Option<&str>,
     build_root: &str,
+    package_dir: &Path,
     cross: bool,
     ppa: &[String],
     inject_packages: &[String],
@@ -229,9 +232,8 @@ pub async fn build(
         return Err("Could not install essential packages for the build".into());
     }
 
-    // Find the actual package directory
-    let package_dir =
-        crate::deb::find_package_directory(Path::new(build_root), package, version, &ctx)?;
+    // The package directory was resolved by the caller (the staged copy of
+    // the tree the user pointed at, or the name-pattern search fallback)
     let package_dir_str = package_dir
         .to_str()
         .ok_or("Invalid package directory path")?;
@@ -255,59 +257,23 @@ pub async fn build(
         install_injected_packages(inject_packages, &env, ctx.clone(), view, &sink)?;
     }
 
-    // Install arch-specific build dependencies
-    log::debug!("Installing arch-specific build dependencies...");
-    enter_phase(view, Phase::InstallingBuildDeps);
-    let mut cmd = ctx.command("apt-get");
-    cmd.current_dir(package_dir_str)
-        .envs(env.clone())
-        .arg("-y")
-        .arg("build-dep");
-    if cross {
-        cmd.arg(format!("--host-architecture={arch}"));
-    }
-    cmd.arg("--arch-only");
-    let status = cap(&mut cmd, &sink).arg("./").status()?;
-
-    // If build-dep fails, we try to explain the failure using dose-debcheck
-    if !status.success() {
-        view.suspend();
-        dose3_explain_dependencies(package, version, arch, build_root, cross, ctx.clone())?;
-        return Err("Could not install build-dependencies for the build".into());
-    }
-
-    // Install arch-independant build dependencies, only if the source declares
-    // any: without --arch-only this pass resolves the whole Build-Depends field
-    // too, which is redundant after the first pass and breaks cross builds.
-    let has_indep_deps = match ctx.read_file(&package_dir.join("debian/control")) {
-        Ok(control) => control
-            .lines()
-            .any(|l| l.to_ascii_lowercase().starts_with("build-depends-indep:")),
-        Err(e) => {
-            log::debug!("cannot read debian/control for indep build-deps: {}", e);
-            true
-        }
-    };
-    if has_indep_deps {
-        log::debug!("Installing arch-independant build dependencies...");
-        let mut cmd = ctx.command("apt-get");
-        cmd.current_dir(package_dir_str)
-            .envs(env.clone())
-            .arg("-y")
-            .arg("build-dep");
-        if cross {
-            cmd.arg(format!("--host-architecture={arch}"));
-        }
-        cmd.arg("./");
-        let status = cap(&mut cmd, &sink).status()?;
-
-        // If build-dep fails, we try to explain the failure using dose-debcheck
-        if !status.success() {
-            view.suspend();
-            dose3_explain_dependencies(package, version, arch, build_root, cross, ctx.clone())?;
-            return Err("Could not install build-dependencies for the build".into());
-        }
-    }
+    // Resolve and install the Build-* dependencies with dpkg's cross
+    // semantics; this replaces the historical `apt-get build-dep` passes,
+    // whose `--host-architecture` resolution cannot express the
+    // Multi-Arch-aware variant choice dpkg's checker requires.
+    install_build_dependencies(
+        package,
+        version,
+        arch,
+        series,
+        package_dir_str,
+        build_root,
+        cross,
+        &env,
+        ctx.clone(),
+        view,
+        &sink,
+    )?;
 
     // Run the build step
     log::debug!("Building (debian/rules build) package...");
@@ -371,6 +337,416 @@ pub async fn build(
     Ok(artifacts)
 }
 
+/// One candidate binary package for a dependency name, as reported by
+/// `apt-cache show`.
+#[derive(Debug, Clone)]
+struct Candidate {
+    /// Debian architecture of the candidate (`amd64`, `arm64`, `all`, ...).
+    arch: String,
+    /// Multi-Arch attribute; an absent field means `no`.
+    multiarch: String,
+}
+
+/// Pure core of the install strategy: the apt install specification that
+/// satisfies `rel` among the `candidates` available for its package name.
+///
+/// The mapping reproduces the dpkg cross semantics that
+/// [`crate::debian::deps`] evaluates against (`Dpkg::Deps::KnownFacts
+/// _find_package`), preferring the runnable build-architecture variant
+/// whenever dpkg's rules accept several:
+///
+/// - unqualified: a `Multi-Arch: foreign` build-architecture candidate
+///   (tools: the variant that runs on the build machine), then the
+///   host-architecture candidate (the variant dpkg checks unqualified
+///   dependencies against), then an `Architecture: all` candidate. A
+///   foreign-arch candidate of a non-foreign package satisfies nothing in
+///   cross mode — installing it would diverge from the checker;
+/// - `:native`: the build-architecture candidate (`Architecture: all`
+///   accepted); a `Multi-Arch: foreign` candidate aborts the lookup,
+///   like dpkg's checker;
+/// - `:any`: a `Multi-Arch: allowed` candidate, host architecture first;
+/// - explicit `:arch`: exactly that candidate;
+/// - a name with no candidate at all is passed through unqualified, so
+///   apt resolves virtual packages (`debhelper-compat`, dbus session
+///   alternatives, ...) to a satisfying provider.
+///
+/// `None` when no candidate can satisfy the relation per dpkg semantics:
+/// the caller falls through to the next alternative of the clause.
+fn install_spec_for(
+    rel: &PkgRelation,
+    candidates: &[Candidate],
+    build_arch: &str,
+    host_arch: &str,
+) -> Option<String> {
+    let qualified = |arch: &str| format!("{}:{}", rel.package, arch);
+    match rel.arch_qualifier.as_deref() {
+        Some("native") => {
+            if candidates
+                .iter()
+                .any(|c| c.arch == build_arch && c.multiarch == "foreign")
+            {
+                return None;
+            }
+            candidates
+                .iter()
+                .find(|c| c.arch == build_arch)
+                .map(|_| qualified(build_arch))
+                .or_else(|| {
+                    candidates
+                        .iter()
+                        .find(|c| c.arch == "all")
+                        .map(|_| rel.package.clone())
+                })
+        }
+        Some("any") => candidates
+            .iter()
+            .filter(|c| c.multiarch == "allowed")
+            .find(|c| c.arch == host_arch)
+            .or_else(|| candidates.iter().find(|c| c.multiarch == "allowed"))
+            .map(|c| qualified(&c.arch)),
+        Some(qual) => candidates
+            .iter()
+            .find(|c| c.arch == qual)
+            .map(|_| qualified(qual)),
+        None => {
+            if candidates.is_empty() {
+                return Some(rel.package.clone());
+            }
+            candidates
+                .iter()
+                .find(|c| c.arch == build_arch && c.multiarch == "foreign")
+                .map(|_| qualified(build_arch))
+                .or_else(|| {
+                    candidates
+                        .iter()
+                        .find(|c| c.arch == host_arch)
+                        .map(|_| qualified(host_arch))
+                })
+                .or_else(|| {
+                    candidates
+                        .iter()
+                        .find(|c| c.arch == "all")
+                        .map(|_| rel.package.clone())
+                })
+        }
+    }
+}
+
+/// Pure core of the resolver loop: the next batch of install
+/// specifications, one alternative per still-unsatisfied clause,
+/// advancing each clause's cursor past the alternatives that no candidate
+/// can satisfy per dpkg semantics.
+fn next_install_pass(
+    clauses: &[Vec<PkgRelation>],
+    unsatisfied: &[usize],
+    cursors: &mut [usize],
+    candidates: &BTreeMap<String, Vec<Candidate>>,
+    build_arch: &str,
+    host_arch: &str,
+) -> Vec<String> {
+    let mut specs = Vec::new();
+    for &i in unsatisfied {
+        let empty = Vec::new();
+        while cursors[i] < clauses[i].len() {
+            let rel = &clauses[i][cursors[i]];
+            let cands = candidates.get(&rel.package).unwrap_or(&empty);
+            let spec = install_spec_for(rel, cands, build_arch, host_arch);
+            cursors[i] += 1;
+            if let Some(spec) = spec {
+                specs.push(spec);
+                break;
+            }
+        }
+    }
+    specs
+}
+
+/// Query the candidates available in the build context for `names`: one
+/// entry per (package, architecture). The plain name surfaces the
+/// build-architecture and `all` candidates; the host-qualified name is
+/// what surfaces foreign-arch candidates. Names missing from the indexes
+/// and virtual names simply produce no stanza.
+fn query_candidates(
+    ctx: &Arc<Context>,
+    names: &[String],
+    build_arch: &str,
+    host_arch: &str,
+) -> BTreeMap<String, Vec<Candidate>> {
+    let mut query: Vec<String> = Vec::new();
+    for name in names {
+        query.push(name.clone());
+        if host_arch != build_arch {
+            query.push(format!("{name}:{host_arch}"));
+        }
+    }
+    let Ok(output) = ctx.command("apt-cache").arg("show").args(&query).output() else {
+        return BTreeMap::new();
+    };
+
+    let mut map: BTreeMap<String, Vec<Candidate>> = BTreeMap::new();
+    for para in crate::debian::control::parse_paragraphs(&String::from_utf8_lossy(&output.stdout)) {
+        let Some(name) = para.get("Package") else {
+            continue;
+        };
+        let Some(arch) = para.get("Architecture") else {
+            continue;
+        };
+        let entry = map.entry(name.to_string()).or_default();
+        if entry.iter().any(|c| c.arch == arch) {
+            continue;
+        }
+        entry.push(Candidate {
+            arch: arch.to_string(),
+            multiarch: para.get("Multi-Arch").unwrap_or("no").to_string(),
+        });
+    }
+    map
+}
+
+/// Build architecture inside the build context.
+fn context_build_arch(ctx: &Arc<Context>) -> String {
+    ctx.command("dpkg")
+        .arg("--print-architecture")
+        .output()
+        .ok()
+        .filter(|o| o.status.success())
+        .map(|o| String::from_utf8_lossy(&o.stdout).trim().to_string())
+        .filter(|s| !s.is_empty())
+        .unwrap_or_else(crate::get_current_arch)
+}
+
+/// Active build profiles for the dependency evaluation: what the build
+/// steps run with (`DEB_BUILD_PROFILES`, set to `cross` for cross
+/// builds), else the vendor defaults.
+fn build_profiles_for(env: &HashMap<String, String>, ctx: &Arc<Context>) -> Vec<String> {
+    match env.get("DEB_BUILD_PROFILES") {
+        Some(value) => value
+            .split(',')
+            .map(|p| p.trim().to_string())
+            .filter(|p| !p.is_empty())
+            .collect(),
+        None => {
+            let vendor = ctx
+                .read_file(Path::new("/etc/dpkg/origins/default"))
+                .ok()
+                .and_then(|content| crate::build::env::vendor_from_origins_content(&content))
+                .unwrap_or_else(crate::build::env::current_vendor);
+            crate::build::env::resolve_build_profiles(&[], &vendor)
+        }
+    }
+}
+
+/// Installed-package facts inside the build context. An unreadable status
+/// database (fresh chroot) yields empty facts: everything declared then
+/// installs.
+fn load_context_facts(ctx: &Arc<Context>, build_arch: &str, host_arch: &str) -> Facts {
+    match ctx.read_file(Path::new("/var/lib/dpkg/status")) {
+        Ok(content) => Facts::from_status(&content, host_arch, build_arch),
+        Err(e) => {
+            log::debug!("cannot read the context dpkg status: {e}");
+            Facts::new(host_arch, build_arch)
+        }
+    }
+}
+
+/// Resolve and install the Build-* dependencies with dpkg's cross
+/// semantics: the clauses of `debian/control` are evaluated natively (the
+/// `crate::debian::deps` `dpkg-checkbuilddeps` equivalent) against the
+/// context's installed-package state, and the unsatisfied ones install
+/// through explicitly architecture-qualified names.
+///
+/// Build conflicts abort before anything installs. The loop installs one
+/// alternative per still-unsatisfied clause per apt transaction and
+/// re-evaluates after each; a clause whose alternatives no candidate can
+/// satisfy per dpkg semantics aborts the build. On failure the dose3
+/// diagnosis runs, like the historical `build-dep` passes.
+#[allow(clippy::too_many_arguments)]
+fn install_build_dependencies(
+    package: &str,
+    version: &str,
+    arch: &str,
+    series: &str,
+    package_dir: &str,
+    build_root: &str,
+    cross: bool,
+    env: &HashMap<String, String>,
+    ctx: Arc<Context>,
+    view: &dyn BuildView,
+    sink: &Option<Arc<dyn LineSink>>,
+) -> Result<(), Box<dyn Error>> {
+    enter_phase(view, Phase::InstallingBuildDeps);
+
+    let host_arch = arch.to_string();
+    let build_arch = context_build_arch(&ctx);
+    let profiles = build_profiles_for(env, &ctx);
+
+    let control_content = ctx
+        .read_file(&Path::new(package_dir).join("debian/control"))
+        .map_err(|e| format!("cannot read debian/control: {e}"))?;
+    let control = ControlInfo::parse_content(&control_content)
+        .map_err(|e| format!("invalid debian/control in {package_dir}: {e}"))?;
+    let source = &control.source;
+    let deps_value = ["Build-Depends", "Build-Depends-Arch", "Build-Depends-Indep"]
+        .iter()
+        .filter_map(|f| source.get(f))
+        .collect::<Vec<_>>()
+        .join(", ");
+    let conflicts_value = [
+        "Build-Conflicts",
+        "Build-Conflicts-Arch",
+        "Build-Conflicts-Indep",
+    ]
+    .iter()
+    .filter_map(|f| source.get(f))
+    .collect::<Vec<_>>()
+    .join(", ");
+    if deps_value.trim().is_empty() && conflicts_value.trim().is_empty() {
+        return Ok(());
+    }
+
+    let parse_opts = ParseOpts {
+        host_arch: host_arch.clone(),
+        build_arch: build_arch.clone(),
+        build_profiles: profiles,
+        reduce_restrictions: true,
+        union: false,
+        build_dep: true,
+    };
+    let mut clauses: Vec<Vec<PkgRelation>> = Deps::parse(&deps_value, &parse_opts)?
+        .clauses()
+        .map(<[PkgRelation]>::to_vec)
+        .collect();
+    // Package-specific workarounds (see data/quirks.yml), before anything
+    // derives candidate queries or install specs from the clauses.
+    crate::quirks::apply_dependency_quirks(package, series, &mut clauses, &parse_opts)?;
+    let conflict_clauses: Vec<Vec<PkgRelation>> = if conflicts_value.trim().is_empty() {
+        Vec::new()
+    } else {
+        let union_opts = ParseOpts {
+            union: true,
+            ..parse_opts.clone()
+        };
+        Deps::parse(&conflicts_value, &union_opts)?
+            .clauses()
+            .map(<[PkgRelation]>::to_vec)
+            .collect()
+    };
+
+    let names: Vec<String> = clauses
+        .iter()
+        .chain(conflict_clauses.iter())
+        .flatten()
+        .map(|rel| rel.package.clone())
+        .collect::<BTreeSet<_>>()
+        .into_iter()
+        .collect();
+    let candidates = query_candidates(&ctx, &names, &build_arch, &host_arch);
+
+    let mut cursors = vec![0usize; clauses.len()];
+    loop {
+        let facts = load_context_facts(&ctx, &build_arch, &host_arch);
+
+        // Build conflicts use the same lookup as dependencies in dpkg's
+        // checker: a satisfied conflict clause aborts before anything
+        // installs.
+        let mut violated = Vec::new();
+        for alternatives in &conflict_clauses {
+            for rel in alternatives {
+                if facts.evaluate_relation(rel) == Some(true) {
+                    violated.push(rel.output());
+                    break;
+                }
+            }
+        }
+        if !violated.is_empty() {
+            view.suspend();
+            if let Err(e) =
+                dose3_explain_dependencies(package, version, arch, build_root, cross, ctx.clone())
+            {
+                log::debug!("dose-builddebcheck diagnosis failed: {e}");
+            }
+            return Err(format!(
+                "build dependencies conflict with installed packages: {}",
+                violated.join(", ")
+            )
+            .into());
+        }
+
+        let unsatisfied: Vec<usize> = (0..clauses.len())
+            .filter(|&i| {
+                !clauses[i]
+                    .iter()
+                    .any(|rel| facts.evaluate_relation(rel) == Some(true))
+            })
+            .collect();
+        if unsatisfied.is_empty() {
+            return Ok(());
+        }
+
+        let specs = next_install_pass(
+            &clauses,
+            &unsatisfied,
+            &mut cursors,
+            &candidates,
+            &build_arch,
+            &host_arch,
+        );
+        if specs.is_empty() {
+            view.suspend();
+            if let Err(e) =
+                dose3_explain_dependencies(package, version, arch, build_root, cross, ctx.clone())
+            {
+                log::debug!("dose-builddebcheck diagnosis failed: {e}");
+            }
+            let remaining: Vec<String> = unsatisfied
+                .iter()
+                .map(|&i| {
+                    clauses[i]
+                        .iter()
+                        .map(PkgRelation::output)
+                        .collect::<Vec<_>>()
+                        .join(" | ")
+                })
+                .collect();
+            return Err(format!(
+                "Could not satisfy build dependencies per dpkg cross semantics: {}",
+                remaining.join(", ")
+            )
+            .into());
+        }
+
+        log::debug!("Installing build dependencies: {:?}", specs);
+        let mut cmd = ctx.command("apt-get");
+        cmd.envs(env.clone()).arg("-y").arg("install");
+        for spec in &specs {
+            cmd.arg(spec);
+        }
+        let status = cap(&mut cmd, sink).status()?;
+        if !status.success() {
+            view.suspend();
+            // Diagnosing a dependency failure the user interrupted themselves
+            // is wasted work
+            if !crate::interrupt::interrupted()
+                && let Err(e) = dose3_explain_dependencies(
+                    package,
+                    version,
+                    arch,
+                    build_root,
+                    cross,
+                    ctx.clone(),
+                )
+            {
+                log::debug!("dose-builddebcheck diagnosis failed: {e}");
+            }
+            return Err(format!(
+                "Could not install build-dependencies for the build: {}",
+                specs.join(" ")
+            )
+            .into());
+        }
+    }
+}
+
 /// Collect the binary artifacts (.deb/.udeb) registered by the build in
 /// `debian/files`, returning their paths inside the build context
 /// (`<build_root>/<filename>`). `debian/files` is the canonical record of
@@ -724,6 +1100,158 @@ mod tests {
     use super::*;
     use crate::context::ContextConfig;
 
+    fn cand(arch: &str, ma: &str) -> Candidate {
+        Candidate {
+            arch: arch.to_string(),
+            multiarch: ma.to_string(),
+        }
+    }
+
+    fn rel(s: &str) -> PkgRelation {
+        crate::debian::deps::parse_simple(s, true).unwrap()
+    }
+
+    /// Unqualified dependencies install the dpkg-satisfying variant,
+    /// preferring the runnable build-architecture one: Multi-Arch:
+    /// foreign candidates from the build architecture, then the
+    /// host-architecture candidate dpkg checks them against, then
+    /// `Architecture: all`. A foreign-arch candidate of a non-foreign
+    /// package satisfies nothing in cross mode.
+    #[test]
+    fn install_spec_unqualified_prefers_runnable_then_host() {
+        let host = "arm64";
+        let build = "amd64";
+
+        let spec = install_spec_for(
+            &rel("t"),
+            &[cand("amd64", "foreign"), cand("arm64", "same")],
+            build,
+            host,
+        )
+        .unwrap();
+        assert_eq!(spec, "t:amd64");
+
+        let spec = install_spec_for(
+            &rel("t"),
+            &[cand("arm64", "same"), cand("amd64", "no")],
+            build,
+            host,
+        )
+        .unwrap();
+        assert_eq!(spec, "t:arm64");
+
+        assert_eq!(
+            install_spec_for(&rel("t"), &[cand("amd64", "no")], build, host),
+            None
+        );
+
+        let spec = install_spec_for(&rel("t"), &[cand("all", "foreign")], build, host).unwrap();
+        assert_eq!(spec, "t");
+
+        // Native builds (host == build): a plain Multi-Arch: no candidate
+        // is the host candidate.
+        let spec = install_spec_for(&rel("t"), &[cand("amd64", "no")], "amd64", "amd64").unwrap();
+        assert_eq!(spec, "t:amd64");
+    }
+
+    /// Qualified dependencies install exactly the variant their qualifier
+    /// selects per dpkg semantics; virtual names (no candidates) pass
+    /// through unqualified for apt to resolve a provider.
+    #[test]
+    fn install_spec_qualifiers() {
+        let host = "arm64";
+        let build = "amd64";
+
+        // :native: the build-architecture candidate; an Architecture: all
+        // candidate passes under the plain name; a Multi-Arch: foreign
+        // candidate aborts the lookup, like dpkg's checker.
+        assert_eq!(
+            install_spec_for(&rel("t:native"), &[cand("amd64", "no")], build, host).unwrap(),
+            "t:amd64"
+        );
+        assert_eq!(
+            install_spec_for(&rel("t:native"), &[cand("all", "no")], build, host).unwrap(),
+            "t"
+        );
+        assert_eq!(
+            install_spec_for(&rel("t:native"), &[cand("amd64", "foreign")], build, host),
+            None
+        );
+
+        // :any: a Multi-Arch: allowed candidate, host first.
+        assert_eq!(
+            install_spec_for(
+                &rel("t:any"),
+                &[cand("amd64", "allowed"), cand("arm64", "allowed")],
+                build,
+                host
+            )
+            .unwrap(),
+            "t:arm64"
+        );
+        assert_eq!(
+            install_spec_for(&rel("t:any"), &[cand("riscv64", "allowed")], build, host).unwrap(),
+            "t:riscv64"
+        );
+        assert_eq!(
+            install_spec_for(&rel("t:any"), &[cand("amd64", "same")], build, host),
+            None
+        );
+
+        // Explicit qualifier: exactly that candidate.
+        assert_eq!(
+            install_spec_for(&rel("t:arm64"), &[cand("arm64", "same")], build, host).unwrap(),
+            "t:arm64"
+        );
+        assert_eq!(
+            install_spec_for(&rel("t:arm64"), &[cand("amd64", "same")], build, host),
+            None
+        );
+
+        // Virtual package: debhelper-compat and friends.
+        assert_eq!(
+            install_spec_for(&rel("t (= 13)"), &[], build, host).unwrap(),
+            "t"
+        );
+    }
+
+    /// The resolver loop tries the alternatives of a clause in order,
+    /// falling past the ones no candidate can satisfy, and stops
+    /// contributing a clause once its alternatives are exhausted.
+    #[test]
+    fn next_install_pass_falls_through_alternatives() {
+        // `a:arm64` has only an amd64 candidate: no candidate satisfies
+        // the explicit qualifier, so the clause falls through to `t`.
+        let clauses = vec![
+            vec![rel("a:arm64"), rel("t")],
+            vec![rel("u")],
+            vec![rel("v")],
+        ];
+        let mut candidates = BTreeMap::new();
+        candidates.insert("a".to_string(), vec![cand("amd64", "same")]);
+        candidates.insert("t".to_string(), vec![cand("arm64", "same")]);
+        candidates.insert("v".to_string(), vec![cand("amd64", "foreign")]);
+        let mut cursors = vec![0; clauses.len()];
+
+        let host = "arm64";
+        let build = "amd64";
+        let specs = next_install_pass(&clauses, &[0, 1, 2], &mut cursors, &candidates, build, host);
+        assert_eq!(
+            specs,
+            vec![
+                "t:arm64".to_string(),
+                "u".to_string(),
+                "v:amd64".to_string()
+            ]
+        );
+        assert_eq!(cursors, vec![2, 1, 1]);
+
+        // An exhausted clause contributes nothing; the loop aborts with
+        // the remaining clauses when nothing installs any more.
+        let specs = next_install_pass(&clauses, &[1], &mut cursors, &candidates, build, host);
+        assert!(specs.is_empty());
+    }
+
     #[test]
     fn detector_matches_local_options_options_and_dashed_spellings() {
         // The pkh scaffold spelling: bare token in local-options.

src/deb/mod.rs

@@ -269,6 +269,19 @@ async fn build_binary_package_impl(
             .ok_or("Cannot find parent directory name")?;
         let build_root = format!("{}/{}", build_root, parent_dir_name.to_str().unwrap());
 
+        // Resolve the package directory inside the staging area. The tree
+        // the caller pointed at is authoritative (its changelog defined the
+        // package/version/series above), so its staged copy wins; the
+        // name-pattern search only runs as a fallback.
+        let package_dir = resolve_package_directory(
+            Path::new(&build_root),
+            cwd,
+            &package,
+            &version,
+            series,
+            &build_ctx,
+        )?;
+
         // Run the build using target build mode. It returns the exact set of
         // artifacts produced by this build (binary packages registered in
         // debian/files plus the generated .buildinfo/.changes), as paths
@@ -282,6 +295,7 @@ async fn build_binary_package_impl(
                     series,
                     pocket.as_deref(),
                     &build_root,
+                    &package_dir,
                     cross,
                     ppa,
                     inject,
@@ -329,6 +343,38 @@ async fn build_binary_package_impl(
     result
 }
 
+/// Resolve the package directory for a build inside the staged build root.
+///
+/// The tree the caller pointed at is authoritative: `cwd`'s changelog
+/// already defined the package, version and series for this build, so its
+/// staged copy is used outright when it carries a `debian/` tree. The
+/// name-pattern search ([`find_package_directory`], including the quirks
+/// overrides) only runs when that copy cannot be resolved — a default `.`
+/// cwd has no basename, and the pointed-at tree may live outside the staged
+/// parent. Embedded callers are the motivation: their working directory
+/// names (`tree`, `checkout`, ...) match none of the search patterns.
+pub(crate) fn resolve_package_directory(
+    build_root: &Path,
+    cwd: &Path,
+    package: &str,
+    version: &str,
+    series: &str,
+    ctx: &context::Context,
+) -> Result<PathBuf, Box<dyn Error>> {
+    if let Some(tree_name) = cwd.file_name() {
+        let staged_tree = build_root.join(tree_name);
+        if ctx.is_dir(&staged_tree)? && ctx.exists(&staged_tree.join("debian"))? {
+            log::debug!(
+                "Using the staged copy of {} at {}",
+                cwd.display(),
+                staged_tree.display()
+            );
+            return Ok(staged_tree);
+        }
+    }
+    find_package_directory(build_root, package, version, series, ctx)
+}
+
 /// Find the current package directory by trying both patterns:
 /// - package/package
 /// - package/package-origversion
@@ -337,10 +383,11 @@ pub(crate) fn find_package_directory(
     parent_dir: &Path,
     package: &str,
     version: &str,
+    series: &str,
     ctx: &context::Context,
 ) -> Result<PathBuf, Box<dyn Error>> {
     // Check quirks first for custom package directories
-    let custom_dirs = crate::quirks::get_package_directories(package);
+    let custom_dirs = crate::quirks::get_package_directories(package, series);
     for custom_dir in custom_dirs {
         let package_dir = parent_dir.join(&custom_dir);
         if ctx.exists(&package_dir)? && ctx.exists(&package_dir.join("debian"))? {
@@ -412,11 +459,13 @@ pub(crate) fn find_package_directory(
         let entries = ctx.list_files(package_parent)?;
         let mut found_dirs = Vec::new();
         for entry in entries {
-            if entry.is_dir() {
-                if let Some(file_name) = entry.file_name() {
-                    found_dirs.push(file_name.to_string_lossy().into_owned());
-                }
+            // list_files yields context-relative paths (e.g. rooted inside
+            // the chroot for an unshare context): classify through the
+            // context, a host-side stat would miss every entry.
+            let is_dir = ctx.is_dir(&entry)?;
             log::debug!("  - {}", entry.display());
+            if is_dir && let Some(file_name) = entry.file_name() {
+                found_dirs.push(file_name.to_string_lossy().into_owned());
             }
         }
 
@@ -500,6 +549,101 @@ mod tests {
         }
     }
 
+    /// An unshare context mapped over `chroot_root`, parented on a local
+    /// context like the ephemeral build contexts are: exists/list_files/
+    /// is_dir answer through the path mapping, no namespace privileges
+    /// needed.
+    fn unshare_test_context(chroot_root: &Path) -> Context {
+        let base = Context::new(crate::context::ContextConfig::Local).unwrap();
+        Context::with_parent(
+            crate::context::ContextConfig::Unshare {
+                path: chroot_root.to_string_lossy().to_string(),
+                parent: None,
+            },
+            Arc::new(base),
+        )
+    }
+
+    /// The staging-area listing must classify entries through the context:
+    /// an unshare context returns build-root-relative paths that a host-side
+    /// stat never sees (they live under the chroot root on the host), which
+    /// used to silently empty the 'Found directories' list of the search
+    /// failure message — and with it every hint about the actual layout.
+    #[test]
+    fn find_package_directory_lists_staged_directories_through_the_context() {
+        let chroot = tempfile::tempdir().unwrap();
+        // Staged parent holding a single tree whose name matches none of
+        // the search patterns (the embedded-caller layout: <job>/tree)
+        let staged_parent = chroot.path().join("tmp/pkh-build-1/j-42");
+        std::fs::create_dir_all(staged_parent.join("tree/debian")).unwrap();
+
+        let ctx = unshare_test_context(chroot.path());
+        let err = find_package_directory(
+            Path::new("/tmp/pkh-build-1/j-42"),
+            "bc",
+            "1.07.1-1ubuntu1",
+            "questing",
+            &ctx,
+        )
+        .expect_err("no candidate matches a tree named 'tree'");
+
+        let message = err.to_string();
+        assert!(
+            message.contains("Found directories: tree"),
+            "error should list the staged directories through the context: {message}"
+        );
+    }
+
+    /// An explicit cwd must resolve to its staged copy even when its name
+    /// matches none of the search patterns: the pointed-at tree is what the
+    /// parsed changelog came from.
+    #[test]
+    fn resolve_package_directory_prefers_the_pointed_tree() {
+        let chroot = tempfile::tempdir().unwrap();
+        let staged_parent = chroot.path().join("tmp/pkh-build-1/j-42");
+        std::fs::create_dir_all(staged_parent.join("tree/debian/source")).unwrap();
+
+        let ctx = unshare_test_context(chroot.path());
+        let resolved = resolve_package_directory(
+            Path::new("/tmp/pkh-build-1/j-42"),
+            Path::new("/work/jobs/j-42/tree"),
+            "bc",
+            "1.07.1-1ubuntu1",
+            "questing",
+            &ctx,
+        )
+        .expect("the staged copy of the pointed-at tree must resolve");
+
+        assert_eq!(resolved, PathBuf::from("/tmp/pkh-build-1/j-42/tree"));
+    }
+
+    /// When the pointed-at tree is not in the staging area under its own
+    /// name, resolution falls back to the name-pattern search.
+    #[test]
+    fn resolve_package_directory_falls_back_to_the_name_search() {
+        let chroot = tempfile::tempdir().unwrap();
+        let staged_parent = chroot.path().join("tmp/pkh-build-1/j-42");
+        // Staged copy of a pulled tree: <pkg>/<pkg>-<origversion>
+        std::fs::create_dir_all(staged_parent.join("bc/bc-1.07.1/debian")).unwrap();
+
+        let ctx = unshare_test_context(chroot.path());
+        let resolved = resolve_package_directory(
+            Path::new("/tmp/pkh-build-1/j-42"),
+            // A tree never staged under that name
+            Path::new("/work/other/checkout"),
+            "bc",
+            "1.07.1-1ubuntu1",
+            "questing",
+            &ctx,
+        )
+        .expect("the pulled-tree layout must resolve via the name search");
+
+        assert_eq!(
+            resolved,
+            PathBuf::from("/tmp/pkh-build-1/j-42/bc/bc-1.07.1")
+        );
+    }
+
     async fn test_build_end_to_end(
         package: &str,
         series: &str,
@@ -533,8 +677,13 @@ mod tests {
         let ctx = Arc::new(Context::new(crate::context::ContextConfig::Local).unwrap());
 
         // Change directory to the package directory
-        let cwd =
-            crate::deb::find_package_directory(cwd, package, &package_info.stanza.version, &ctx)
+        let cwd = crate::deb::find_package_directory(
+            cwd,
+            package,
+            &package_info.stanza.version,
+            series,
+            &ctx,
+        )
         .expect("Cannot find package directory");
         log::debug!("Package directory: {}", cwd.display());
 
@@ -603,12 +752,34 @@ mod tests {
     /// NOTE: Ideally, we want to run this in CI, but it takes more than 1h
     /// to fully build the linux-riscv package on an amd64 builder, which is too
     /// much time
+    /// The series is the current LTS (26.04) rather than an interim one:
+    /// interim series vanish from the mirrors a few months after their EOL
+    /// (questing is already unreachable), an LTS stays pullable for years.
     #[ignore]
     #[tokio::test]
     #[test_log::test]
     #[cfg(target_arch = "x86_64")]
     async fn test_deb_linux_riscv_ubuntu_cross_end_to_end() {
-        test_build_end_to_end("linux-riscv", "questing", None, Some("riscv64"), true).await;
+        test_build_end_to_end("linux-riscv", "resolute", None, Some("riscv64"), true).await;
+    }
+
+    /// KNOWN-BROKEN cross build of the noble-era kernel, kept as an
+    /// ignored fixture to work from. Noble controls declare their build
+    /// tools unqualified (the `:native` idiom landed later), so exact dpkg
+    /// semantics demand host-architecture instances of them
+    /// (python3:riscv64, gcc-13:riscv64, clang-17:riscv64, ...) and the
+    /// resulting two-architecture install set is unsolvable: t64
+    /// libraries (libclang1-17t64) conflict with their own foreign-arch
+    /// variant, and the riscv64 toolchain instances drag depends chains
+    /// (gcc:riscv64) that do not resolve from the chroot sources. A real
+    /// run fails at the apt transaction with 'Unable to correct problems'.
+    /// Resolute-era controls declare :native properly; see the test above.
+    #[ignore]
+    #[tokio::test]
+    #[test_log::test]
+    #[cfg(target_arch = "x86_64")]
+    async fn test_deb_linux_riscv_noble_cross_end_to_end() {
+        test_build_end_to_end("linux-riscv", "noble", None, Some("riscv64"), true).await;
     }
 
     /// This is a specific test case for the latest gcc package on Debian
@@ -739,4 +910,150 @@ mod tests {
             "arch-independant .deb not produced, got: {deb_files:?}"
         );
     }
+
+    /// A cross build whose build-dependencies cannot be satisfied under
+    /// dpkg's cross semantics must abort at the install step, naming the
+    /// unsatisfied dependency: the expected-failure counterpart of the
+    /// cross builds above.
+    #[tokio::test]
+    #[test_log::test]
+    #[cfg(target_arch = "x86_64")]
+    async fn test_deb_cross_unsatisfiable_build_dep_fails_end_to_end() {
+        let temp_dir = tempfile::tempdir().unwrap();
+        let pkg_dir = temp_dir.path().join("pkh-crosstest");
+        std::fs::create_dir_all(pkg_dir.join("debian/source")).unwrap();
+
+        std::fs::write(
+            pkg_dir.join("debian/changelog"),
+            "pkh-crosstest (1.0) noble; urgency=medium\n\n  \
+             * Synthetic package declaring an unsatisfiable build-dependency.\n\n \
+             -- pkh tests <pkh@example.com>  Tue, 15 Sep 2026 08:00:00 +0000\n",
+        )
+        .unwrap();
+
+        std::fs::write(
+            pkg_dir.join("debian/control"),
+            "Source: pkh-crosstest\n\
+             Section: devel\n\
+             Priority: optional\n\
+             Maintainer: pkh tests <pkh@example.com>\n\
+             Standards-Version: 4.7.4\n\
+             Build-Depends: pkh-no-such-package-xyz\n\
+             Architecture: any\n\
+             \n\
+             Package: pkh-crosstest\n\
+             Architecture: any\n\
+             Depends: ${misc:Depends}, ${shlibs:Depends}\n\
+             Description: Cross-build negative regression package\n \
+              Declares a build-dependency absent from the archive.\n",
+        )
+        .unwrap();
+
+        std::fs::write(
+            pkg_dir.join("debian/rules"),
+            "#!/usr/bin/make -f\n%:\n\tdh $@\n",
+        )
+        .unwrap();
+        use std::os::unix::fs::PermissionsExt;
+        let rules = pkg_dir.join("debian/rules");
+        let mut perms = std::fs::metadata(&rules).unwrap().permissions();
+        perms.set_mode(0o755);
+        std::fs::set_permissions(&rules, perms).unwrap();
+
+        std::fs::write(pkg_dir.join("debian/source/format"), "3.0 (native)\n").unwrap();
+
+        let ctx = Arc::new(Context::new(crate::context::ContextConfig::Local).unwrap());
+
+        let err = crate::deb::build_binary_package(DebBuildOptions {
+            arch: Some("arm64".to_string()),
+            series: Some("noble".to_string()),
+            cwd: Some(pkg_dir),
+            cross: true,
+            ctx: Some(ctx),
+            ..Default::default()
+        })
+        .await
+        .expect_err("an unsatisfiable build-dependency must fail the cross build");
+
+        assert!(
+            err.to_string().contains("pkh-no-such-package-xyz"),
+            "error should name the unsatisfied dependency: {err}"
+        );
+    }
+
+    /// An embedded-caller layout — the tree checked out at <job>/tree, a
+    /// name matching none of the search patterns — must build: the staged
+    /// copy of the tree the caller pointed at is resolved directly instead
+    /// of being re-derived from package/version names (which used to fail
+    /// with 'Could not find package directory').
+    #[tokio::test]
+    #[test_log::test]
+    async fn test_deb_builds_a_tree_named_directory_end_to_end() {
+        let temp_dir = tempfile::tempdir().unwrap();
+        let pkg_dir = temp_dir.path().join("j-42/tree");
+        std::fs::create_dir_all(pkg_dir.join("debian/source")).unwrap();
+
+        std::fs::write(
+            pkg_dir.join("debian/changelog"),
+            "pkh-treetest (1.0) noble; urgency=medium\n\n  \
+             * Synthetic package built from a directory named 'tree'.\n\n \
+             -- pkh tests <pkh@example.com>  Tue, 15 Sep 2026 08:00:00 +0000\n",
+        )
+        .unwrap();
+
+        std::fs::write(
+            pkg_dir.join("debian/control"),
+            "Source: pkh-treetest\n\
+             Section: devel\n\
+             Priority: optional\n\
+             Maintainer: pkh tests <pkh@example.com>\n\
+             Standards-Version: 4.7.4\n\
+             Build-Depends: debhelper-compat (= 13)\n\
+             Architecture: any\n\
+             \n\
+             Package: pkh-treetest\n\
+             Architecture: any\n\
+             Depends: ${misc:Depends}, ${shlibs:Depends}\n\
+             Description: Package-directory resolution regression package\n \
+              Its tree lives in a directory whose name matches none of the\n \
+              package-directory search patterns.\n",
+        )
+        .unwrap();
+
+        std::fs::write(
+            pkg_dir.join("debian/rules"),
+            "#!/usr/bin/make -f\n%:\n\tdh $@\n",
+        )
+        .unwrap();
+        use std::os::unix::fs::PermissionsExt;
+        let rules = pkg_dir.join("debian/rules");
+        let mut perms = std::fs::metadata(&rules).unwrap().permissions();
+        perms.set_mode(0o755);
+        std::fs::set_permissions(&rules, perms).unwrap();
+
+        std::fs::write(pkg_dir.join("debian/source/format"), "3.0 (native)\n").unwrap();
+
+        let ctx = Arc::new(Context::new(crate::context::ContextConfig::Local).unwrap());
+
+        crate::deb::build_binary_package(DebBuildOptions {
+            series: Some("noble".to_string()),
+            cwd: Some(pkg_dir),
+            ctx: Some(ctx),
+            ..Default::default()
+        })
+        .await
+        .expect("a tree named 'tree' must build");
+
+        let deb_files: Vec<String> = std::fs::read_dir(temp_dir.path().join("j-42"))
+            .unwrap()
+            .filter_map(|e| e.ok())
+            .map(|e| e.file_name().to_string_lossy().to_string())
+            .collect();
+        assert!(
+            deb_files
+                .iter()
+                .any(|f| f.starts_with("pkh-treetest_1.0_") && f.ends_with(".deb")),
+            ".deb not produced for the 'tree'-named directory, got: {deb_files:?}"
+        );
+    }
 }

src/debian/deps.rs

@@ -1349,6 +1349,233 @@ Provides: virt2 (>= 1.0), plain
         assert_eq!(facts.evaluate_relation(&o("plain")), Some(false));
     }
 
+    /// Cross-compilation semantics of the package lookup (the `Facts`
+    /// host/build split), mirroring `Dpkg::Deps::KnownFacts::_find_package`:
+    /// an unqualified dependency is satisfied by the HOST architecture
+    /// instance, by any instance of a `Multi-Arch: foreign` package, or by
+    /// an `Architecture: all` instance — never by a foreign-arch instance
+    /// of a `Multi-Arch: no`/`same` package. The build-architecture
+    /// instances only come into play through `:native`.
+    ///
+    /// Verdicts marked «live» were probed against `dpkg-checkbuilddeps -a
+    /// <host>` on a real amd64 system carrying the build-arch instances.
+    #[test]
+    fn cross_lookup_matrix() {
+        const O: fn(&str) -> PkgRelation = |s| parse_simple(s, true).unwrap();
+        // host = arm64 (target), build = amd64 (machine): the instances
+        // below simulate what a cross-building amd64 machine has installed.
+        let facts = |ma_build: &str, ma_host: &str| {
+            let mut f = Facts::new("arm64", "amd64");
+            if !ma_build.is_empty() {
+                f.add_installed("t", "1.0", "amd64", ma_build);
+            }
+            if !ma_host.is_empty() {
+                f.add_installed("t", "1.0", "arm64", ma_host);
+            }
+            f
+        };
+
+        // Unqualified: only the host-arch instance satisfies...
+        assert_eq!(
+            facts("no", "").evaluate_relation(&O("t")),
+            Some(false),
+            "M-A:no build-arch instance must not satisfy an unqualified dep"
+        );
+        assert_eq!(
+            facts("same", "").evaluate_relation(&O("t")),
+            Some(false),
+            "M-A:same build-arch instance must not satisfy an unqualified dep"
+        );
+        assert_eq!(facts("", "no").evaluate_relation(&O("t")), Some(true));
+        assert_eq!(facts("", "same").evaluate_relation(&O("t")), Some(true));
+        // ...unless the package is Multi-Arch: foreign («live»: bison,
+        // flex: the natively-installed variant satisfies the cross check).
+        assert_eq!(facts("foreign", "").evaluate_relation(&O("t")), Some(true));
+        assert_eq!(facts("", "foreign").evaluate_relation(&O("t")), Some(true));
+
+        // `Architecture: all` instances satisfy unqualified dependencies
+        // whatever the Multi-Arch attribute.
+        let mut all = Facts::new("arm64", "amd64");
+        all.add_installed("t", "1.0", "all", "foreign");
+        assert_eq!(all.evaluate_relation(&O("t")), Some(true));
+        let mut all2 = Facts::new("arm64", "amd64");
+        all2.add_installed("t", "1.0", "all", "no");
+        assert_eq!(all2.evaluate_relation(&O("t")), Some(true));
+
+        // Versioned relations check the first matching instance only:
+        // insertion order decides which instance a dependency binds to,
+        // and an unsatisfying version does not fall through to later
+        // instances.
+        let mut mixed = Facts::new("arm64", "amd64");
+        mixed.add_installed("t", "0.5", "arm64", "no");
+        mixed.add_installed("t", "3.0", "amd64", "no");
+        assert_eq!(mixed.evaluate_relation(&O("t (>= 1)")), Some(false));
+        assert_eq!(mixed.evaluate_relation(&O("t (<< 1)")), Some(true));
+
+        // `:native`: the build-architecture instance satisfies («live»:
+        // gcc:native on an amd64 machine, whatever the target); an
+        // Architecture: all instance does too — but a Multi-Arch: foreign
+        // instance aborts the whole lookup, even on the build architecture
+        // («live»: flex:native with natively-installed M-A:foreign flex is
+        // unmet).
+        assert_eq!(
+            facts("no", "").evaluate_relation(&O("t:native")),
+            Some(true)
+        );
+        assert_eq!(
+            facts("same", "").evaluate_relation(&O("t:native")),
+            Some(true)
+        );
+        assert_eq!(
+            facts("foreign", "").evaluate_relation(&O("t:native")),
+            Some(false)
+        );
+        // An Architecture: all instance satisfies :native — unless it is
+        // Multi-Arch: foreign, which aborts the lookup like any foreign
+        // instance.
+        assert_eq!(all2.evaluate_relation(&O("t:native")), Some(true));
+        assert_eq!(all.evaluate_relation(&O("t:native")), Some(false));
+        assert_eq!(
+            facts("", "no").evaluate_relation(&O("t:native")),
+            Some(false)
+        );
+
+        // `:any`: only a Multi-Arch: allowed instance satisfies, on any
+        // architecture («live»: libssl-dev:any with M-A:same libssl-dev is
+        // unmet).
+        assert_eq!(
+            facts("allowed", "").evaluate_relation(&O("t:any")),
+            Some(true)
+        );
+        assert_eq!(
+            facts("", "allowed").evaluate_relation(&O("t:any")),
+            Some(true)
+        );
+        assert_eq!(
+            facts("same", "").evaluate_relation(&O("t:any")),
+            Some(false)
+        );
+
+        // Explicit architecture qualifier: only that exact instance.
+        assert_eq!(facts("no", "").evaluate_relation(&O("t:amd64")), Some(true));
+        assert_eq!(
+            facts("", "no").evaluate_relation(&O("t:amd64")),
+            Some(false)
+        );
+    }
+
+    /// The same cross matrix, validated against the real
+    /// `dpkg-checkbuilddeps`: for each fixture the exit status and the
+    /// reported unmet list must match, with host != build (the machine is
+    /// the native architecture; the host architecture is a foreign one).
+    #[test]
+    fn diff_checkbuilddeps_cross_matrix() {
+        let build_arch = arch::native().unwrap_or_else(|_| "amd64".into());
+        // Any foreign arch the dpkg tables know; the instances only exist
+        // in the synthetic status file.
+        let host_arch = if build_arch == "arm64" {
+            "riscv64".to_string()
+        } else {
+            "arm64".to_string()
+        };
+
+        let mk_status = |entries: &[(&str, &str)]| {
+            let mut s = String::new();
+            for (pkg_arch, ma) in entries {
+                let ma = if ma.is_empty() { "no" } else { ma };
+                s.push_str(&format!(
+                    "Package: t\nStatus: install ok installed\nVersion: 1.0\nArchitecture: {pkg_arch}\nMulti-Arch: {ma}\n\n"
+                ));
+            }
+            s
+        };
+
+        for (name, entries, dep) in [
+            // Unqualified: build-arch instances never satisfy, host-arch
+            // and Multi-Arch: foreign do.
+            ("ma-no-build", &[("amd64", "no")] as &[(&str, &str)], "t"),
+            ("ma-same-build", &[("amd64", "same")], "t"),
+            ("ma-no-host", &[("arm64", "no")], "t"),
+            ("ma-same-host", &[("arm64", "same")], "t"),
+            ("ma-foreign-build", &[("amd64", "foreign")], "t"),
+            ("all-build", &[("all", "foreign")], "t"),
+            // :native and :any qualifiers.
+            ("native-build", &[("amd64", "no")], "t:native"),
+            ("native-foreign-build", &[("amd64", "foreign")], "t:native"),
+            ("any-allowed-build", &[("amd64", "allowed")], "t:any"),
+            ("any-same-build", &[("amd64", "same")], "t:any"),
+            ("explicit-build", &[("amd64", "no")], "t:amd64"),
+            ("explicit-host", &[("arm64", "no")], "t:amd64"),
+        ] {
+            // Substitute the foreign architecture for fixtures that name
+            // the host arch explicitly.
+            let dep = dep.replace("arm64", &host_arch);
+            let entries: Vec<(String, &str)> = entries
+                .iter()
+                .map(|(a, m)| (a.replace("amd64", &build_arch), *m))
+                .collect();
+            let entries: Vec<(&str, &str)> =
+                entries.iter().map(|(a, m)| (a.as_str(), *m)).collect();
+            let status = mk_status(&entries);
+            let verdict = |bd: &str, host: &str| {
+                diff_cross_case(bd, &status, &build_arch, host, |ours, real| {
+                    assert_eq!(ours, real, "verdict mismatch for {name}")
+                })
+            };
+            verdict(&dep, &host_arch);
+        }
+    }
+
+    /// One differential cross case: run the real `dpkg-checkbuilddeps`
+    /// with `-a <host>` against a synthetic admindir, and the native
+    /// checker with the equivalent options on the same control, then hand
+    /// both verdicts to `compare`.
+    fn diff_cross_case(
+        bd: &str,
+        status: &str,
+        build_arch: &str,
+        host_arch: &str,
+        compare: impl Fn(bool, bool),
+    ) {
+        let control_text = format!(
+            "Source: t\nMaintainer: a <a@b.c>\nBuild-Depends: {bd}\n\nPackage: t\nArchitecture: any\nDescription: x\n y\n"
+        );
+        let dir = tempfile::tempdir().unwrap();
+        std::fs::write(dir.path().join("control"), &control_text).unwrap();
+        let admindir = dir.path().join("admin");
+        std::fs::create_dir_all(&admindir).unwrap();
+        std::fs::write(admindir.join("status"), status).unwrap();
+
+        let output = std::process::Command::new("dpkg-checkbuilddeps")
+            .current_dir(dir.path())
+            .env("LC_ALL", "C")
+            .arg("--admindir")
+            .arg(&admindir)
+            .arg("-a")
+            .arg(host_arch)
+            .arg("-I")
+            .arg("control")
+            .output()
+            .expect("run dpkg-checkbuilddeps (is dpkg-dev installed?)");
+        let real_ok = output.status.success();
+
+        let opts = CheckOpts {
+            host_arch: host_arch.to_string(),
+            build_arch: build_arch.to_string(),
+            build_profiles: Vec::new(),
+            ignore_arch: false,
+            ignore_indep: false,
+            ignore_builtin: true,
+            admindir: admindir.to_path_buf(),
+        };
+        let control = ControlInfo::parse_content(&control_text).unwrap();
+        let ours_ok = check_build_depends(&control, &opts)
+            .expect("native check failure")
+            .is_ok();
+
+        compare(ours_ok, real_ok);
+    }
+
     /// The same undecidable verdicts through the direct facts API: an
     /// unreadable provided version and an invalid (non-`=`) provide each
     /// leave a versioned relation undecided, while a readable provider

src/distro_info.rs

@@ -87,6 +87,11 @@ struct DistData {
     cross_pockets: Vec<String>,
     #[serde(default)]
     build_profiles: Vec<String>,
+    /// Changelog suite names aliasing a distro-info series codename
+    /// ('unstable' for Debian's 'sid'): the two names identify the same
+    /// series ([`series_suite_alias`], [`resolve_suite_alias`])
+    #[serde(default)]
+    suite_aliases: HashMap<String, String>,
     series: SeriesInfo,
 }
 
@@ -413,6 +418,30 @@ pub async fn get_dist_from_series(series: &str) -> Result<String, Box<dyn Error>
     Err(format!("Unknown series: {}", series).into())
 }
 
+/// The changelog suite name that aliases the series codename of `dist`
+/// (Debian's 'unstable' for 'sid'): the two names identify the same
+/// series. `None` when the series carries no suite alias.
+pub fn series_suite_alias(dist: &str, series: &str) -> Option<String> {
+    dist_data(dist)
+        .ok()?
+        .suite_aliases
+        .iter()
+        .find(|(_suite, codename)| codename.as_str() == series)
+        .map(|(suite, _)| suite.clone())
+}
+
+/// Identify a changelog suite name with the distro-info series codename
+/// it aliases (Debian's 'unstable' is 'sid'), and the dist that codename
+/// belongs to. `None` when `suite` is not a known alias of any dist.
+pub fn resolve_suite_alias(suite: &str) -> Option<(String, String)> {
+    for (dist, data) in DATA.dist.iter() {
+        if let Some(codename) = data.suite_aliases.get(suite) {
+            return Some((dist.clone(), codename.clone()));
+        }
+    }
+    None
+}
+
 /// Get the package pockets available for a given distribution, in search order
 ///
 /// The main archive ('') comes first so that a search without an explicit
@@ -1035,6 +1064,41 @@ mod tests {
         assert!(series.contains(&"jammy".to_string()));
     }
 
+    /// Suite aliases identify a changelog suite name with the series
+    /// codename of the same series: Debian's 'unstable' is 'sid'
+    #[test]
+    fn test_suite_aliases() {
+        assert_eq!(
+            resolve_suite_alias("unstable"),
+            Some(("debian".to_string(), "sid".to_string()))
+        );
+        // A series codename or unknown suite is not an alias
+        assert_eq!(resolve_suite_alias("sid"), None);
+        assert_eq!(resolve_suite_alias("noble"), None);
+        assert_eq!(
+            series_suite_alias("debian", "sid"),
+            Some("unstable".to_string())
+        );
+        assert_eq!(series_suite_alias("debian", "trixie"), None);
+        assert_eq!(series_suite_alias("ubuntu", "noble"), None);
+    }
+
+    /// Every suite alias must map to a real series of its dist, or the
+    /// selector would offer a phantom entry
+    #[tokio::test]
+    async fn test_suite_aliases_target_real_series() {
+        for (dist, data) in DATA.dist.iter() {
+            for (suite, codename) in &data.suite_aliases {
+                let series = get_ordered_series_name(dist).await.unwrap_or_default();
+                assert!(
+                    series.contains(codename),
+                    "suite alias '{suite}' of {dist} maps to '{codename}', \
+                     which is not a known series"
+                );
+            }
+        }
+    }
+
     #[tokio::test]
     async fn test_get_dist_from_series() {
         assert_eq!(get_dist_from_series("sid").await.unwrap(), "debian");

src/interrupt.rs

@@ -0,0 +1,310 @@
+//! Passive interrupt state shared between the CLI and the library.
+//!
+//! Everything active about Ctrl+C lives in the CLI (`main.rs`): it installs
+//! the SIGINT handler, wakes a watchdog thread, prints the interrupt notice
+//! and exits with the conventional status 130. This module only holds the
+//! state the library's own types need:
+//!
+//! - the interrupted flag ([`mark_interrupted`] / [`interrupted`]), read by
+//!   flows so they stand down while the watchdog tears everything down;
+//! - the cleanup hook registry ([`register_cleanup_hook`]) for resources
+//!   that must not outlive the process (e.g. the ephemeral build chroot,
+//!   see [`crate::deb::ephemeral`]), drained and run by the CLI watchdog
+//!   right before exiting ([`run_cleanup_hooks`]);
+//! - the reporter slot ([`set_reporter`]): the live build view registers
+//!   how to clear the terminal (and where the full log lives); the CLI
+//!   runs it as the first step of the shutdown.
+//!
+//! Nothing here installs signal handlers, prints or exits: a library
+//! consumer embedding these types keeps its own signal disposition.
+
+use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
+use std::sync::{Mutex, PoisonError};
+
+/// How the live view reports an interrupt: it clears the terminal and
+/// returns the log-file hint to print below the notice, if any
+pub type Reporter = Box<dyn FnOnce() -> Option<String> + Send>;
+
+/// A boxed, send-safe cleanup hook body
+type CleanupFn = Box<dyn Fn() + Send>;
+
+/// The reporter run before the cleanup hooks; taken out when it runs
+static REPORTER: Mutex<Option<Reporter>> = Mutex::new(None);
+
+/// Whether a Ctrl+C has been intercepted since the CLI installed the
+/// handler
+static INTERRUPTED: AtomicBool = AtomicBool::new(false);
+
+/// Registry of cleanup hooks waiting to run at interrupt time
+static CLEANUP_HOOKS: Mutex<Vec<CleanupHook>> = Mutex::new(Vec::new());
+
+/// Source of the registry ids used to deregister a specific hook
+static NEXT_CLEANUP_HOOK_ID: AtomicU64 = AtomicU64::new(1);
+
+/// A pending cleanup hook together with its registry id
+struct CleanupHook {
+    id: u64,
+    f: CleanupFn,
+}
+
+/// Record that a Ctrl+C has been intercepted; called by the CLI signal
+/// handler
+pub fn mark_interrupted() {
+    INTERRUPTED.store(true, Ordering::SeqCst);
+}
+
+/// Whether a Ctrl+C has been intercepted; flows use this to stay quiet and
+/// to leave the cleanup to the CLI watchdog
+pub fn interrupted() -> bool {
+    INTERRUPTED.load(Ordering::SeqCst)
+}
+
+/// Register how the live view reports an interrupt: the CLI watchdog runs
+/// it as the first step of the shutdown, before the cleanup hooks. At most
+/// one reporter runs per process: a later call replaces the one set before.
+/// Without any reporter the watchdog only prints the plain notice.
+pub fn set_reporter(report: Reporter) {
+    *REPORTER.lock().unwrap_or_else(PoisonError::into_inner) = Some(report);
+}
+
+/// Take the registered reporter out of the slot; `None` when no live view
+/// registered one (`--verbose`, piped output)
+pub fn take_reporter() -> Option<Reporter> {
+    REPORTER
+        .lock()
+        .unwrap_or_else(PoisonError::into_inner)
+        .take()
+}
+
+/// Register a hook to be run when the process is interrupted (after the
+/// reporter), returning a guard whose drop deregisters the hook again.
+///
+/// Hooks must be self-contained — stored paths plus direct subprocesses —
+/// and must never block indefinitely: they run in the watchdog while the
+/// interrupted flow is still unwinding, and a second Ctrl+C during cleanup
+/// is a no-op.
+pub fn register_cleanup_hook(f: CleanupFn) -> CleanupHookGuard {
+    let id = NEXT_CLEANUP_HOOK_ID.fetch_add(1, Ordering::Relaxed);
+    CLEANUP_HOOKS
+        .lock()
+        .unwrap_or_else(PoisonError::into_inner)
+        .push(CleanupHook { id, f });
+    CleanupHookGuard(id)
+}
+
+/// RAII handle to a registered cleanup hook: dropping it (or an explicit
+/// [`CleanupHookGuard::deregister`]) removes the hook from the registry so
+/// the interrupt path can no longer run it
+pub struct CleanupHookGuard(u64);
+
+impl CleanupHookGuard {
+    /// Registry id of the hook (used to filter the registry in tests)
+    #[cfg(test)]
+    fn id(&self) -> u64 {
+        self.0
+    }
+
+    /// Remove the hook from the registry; returns whether it was still
+    /// pending
+    pub fn deregister(&mut self) -> bool {
+        deregister_cleanup_hook(self.0)
+    }
+}
+
+impl Drop for CleanupHookGuard {
+    fn drop(&mut self) {
+        deregister_cleanup_hook(self.0);
+    }
+}
+
+/// Remove a hook from the registry; returns whether it was still pending
+fn deregister_cleanup_hook(id: u64) -> bool {
+    let mut hooks = CLEANUP_HOOKS.lock().unwrap_or_else(PoisonError::into_inner);
+    let len_before = hooks.len();
+    hooks.retain(|hook| hook.id != id);
+    hooks.len() != len_before
+}
+
+/// Drain and run every registered cleanup hook exactly once.
+///
+/// Called by the CLI watchdog right before the process exits. Draining uses
+/// `try_lock` with a bounded retry instead of a blocking lock as a hard
+/// upper bound on interrupt latency: the sequence must never hang waiting
+/// for a lock, however unlikely a stalled holder is. Timing out therefore
+/// skips cleanup (leaking) rather than hanging.
+pub fn run_cleanup_hooks() {
+    run_drained_hooks(drain_cleanup_hooks());
+}
+
+/// Take every pending hook out of the registry, waiting at most ~1s for the
+/// registry lock (see [`run_cleanup_hooks`] for why this must not block
+/// forever)
+fn drain_cleanup_hooks() -> Vec<CleanupHook> {
+    const RETRIES: usize = 200;
+    const RETRY_DELAY: std::time::Duration = std::time::Duration::from_millis(5);
+
+    for _ in 0..RETRIES {
+        if let Ok(mut hooks) = CLEANUP_HOOKS.try_lock() {
+            return std::mem::take(&mut *hooks);
+        }
+        std::thread::sleep(RETRY_DELAY);
+    }
+    log::error!("Timed out waiting for the cleanup hook registry; skipping interrupt cleanup");
+    Vec::new()
+}
+
+/// Run drained hooks one by one, isolating panics so that one failing hook
+/// cannot skip the remaining ones
+fn run_drained_hooks(hooks: Vec<CleanupHook>) {
+    for CleanupHook { id, f } in hooks {
+        // Hooks are arbitrary user code; assert unwind safety so they can be
+        // run inside a catching context
+        if let Err(panic) = std::panic::catch_unwind(std::panic::AssertUnwindSafe(f)) {
+            log::error!("Cleanup hook {id} panicked: {}", panic_message(&panic));
+        }
+    }
+}
+
+/// Best-effort message extraction from a panic payload
+fn panic_message(panic: &(dyn std::any::Any + Send)) -> String {
+    if let Some(s) = panic.downcast_ref::<&str>() {
+        (*s).to_string()
+    } else if let Some(s) = panic.downcast_ref::<String>() {
+        s.clone()
+    } else {
+        "non-string panic payload".to_string()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::sync::Arc;
+    use std::sync::Mutex as StdMutex;
+    use std::sync::atomic::AtomicUsize;
+
+    /// Serializes these tests: they drain the process-global registry, and
+    /// unrelated tests may hold registrations concurrently that must be
+    /// neither run nor lost. Poison-proof: a test failing while holding the
+    /// lock must not cascade into the others.
+    static TEST_LOCK: StdMutex<()> = StdMutex::new(());
+
+    fn test_lock() -> std::sync::MutexGuard<'static, ()> {
+        TEST_LOCK.lock().unwrap_or_else(PoisonError::into_inner)
+    }
+
+    /// Drain the registry and take out only the hooks with the given ids,
+    /// putting everything else back so unrelated registrations stay pending
+    fn take_hooks(ids: &[u64]) -> Vec<CleanupHook> {
+        let drained = drain_cleanup_hooks();
+        let mut mine = Vec::new();
+        let mut others = Vec::new();
+        for hook in drained {
+            if ids.contains(&hook.id) {
+                mine.push(hook);
+            } else {
+                others.push(hook);
+            }
+        }
+        CLEANUP_HOOKS
+            .lock()
+            .unwrap_or_else(PoisonError::into_inner)
+            .extend(others);
+        mine
+    }
+
+    /// Register a hook that counts its invocations
+    fn counting_hook() -> (CleanupHookGuard, Arc<AtomicUsize>) {
+        let counter = Arc::new(AtomicUsize::new(0));
+        let seen = counter.clone();
+        let guard = register_cleanup_hook(Box::new(move || {
+            seen.fetch_add(1, Ordering::SeqCst);
+        }));
+        (guard, counter)
+    }
+
+    /// Hooks run in registration order, and draining means each hook runs
+    /// exactly once even across repeated cleanup passes.
+    #[test]
+    fn hooks_run_once_in_registration_order() {
+        let _serial = test_lock();
+
+        let log = Arc::new(StdMutex::new(Vec::new()));
+        let mut guards = Vec::new();
+        let mut ids = Vec::new();
+        for name in ["hook-a", "hook-b", "hook-c"] {
+            let log = log.clone();
+            // The returned guard must stay alive: dropping it deregisters
+            let guard = register_cleanup_hook(Box::new(move || {
+                log.lock().unwrap().push(name);
+            }));
+            ids.push(guard.id());
+            guards.push(guard);
+        }
+
+        // Only our own hooks are extracted; they run in registration order
+        let mine = take_hooks(&ids);
+        assert_eq!(mine.len(), ids.len());
+        run_drained_hooks(mine);
+        assert_eq!(*log.lock().unwrap(), vec!["hook-a", "hook-b", "hook-c"]);
+
+        // Draining removed them: a second pass runs nothing again
+        assert!(take_hooks(&ids).is_empty());
+        assert_eq!(*log.lock().unwrap(), vec!["hook-a", "hook-b", "hook-c"]);
+
+        drop(guards);
+    }
+
+    /// A panicking hook is contained by the runner: it neither aborts the
+    /// process nor skips the hooks registered around it.
+    #[test]
+    fn panicking_hook_does_not_skip_the_others() {
+        let _serial = test_lock();
+        // The hook below panics on purpose: do not record it as a test
+        // failure in the end-of-run matrix
+        let _quiet = crate::test_support::suppress_failure_recording();
+
+        let (before, ran_before) = counting_hook();
+        let boom = register_cleanup_hook(Box::new(|| panic!("cleanup exploded")));
+        let (after, ran_after) = counting_hook();
+
+        let ids = [before.id(), boom.id(), after.id()];
+        run_drained_hooks(take_hooks(&ids));
+
+        assert_eq!(ran_before.load(Ordering::SeqCst), 1);
+        assert_eq!(ran_after.load(Ordering::SeqCst), 1);
+    }
+
+    /// Explicit deregistration removes the hook: it is no longer drained and
+    /// never runs; a second deregistration reports it as already gone.
+    #[test]
+    fn deregistered_hook_never_runs() {
+        let _serial = test_lock();
+
+        let (mut guard, ran) = counting_hook();
+
+        assert!(guard.deregister());
+        assert!(!guard.deregister());
+
+        assert!(take_hooks(&[guard.id()]).is_empty());
+        assert_eq!(ran.load(Ordering::SeqCst), 0);
+    }
+
+    /// Dropping the registration guard deregisters the hook implicitly.
+    #[test]
+    fn dropping_the_guard_deregisters_the_hook() {
+        let _serial = test_lock();
+
+        let id;
+        let ran;
+        {
+            let (guard, counter) = counting_hook();
+            id = guard.id();
+            ran = counter;
+            drop(guard);
+        }
+
+        assert!(take_hooks(&[id]).is_empty());
+        assert_eq!(ran.load(Ordering::SeqCst), 0);
+    }
+}

src/launchpad.rs

@@ -41,6 +41,11 @@ struct LaunchpadData {
     ssh_host: String,
     /// Port of the PPA SFTP upload server
     ssh_port: u16,
+    /// Host of the PPA upload queue over anonymous FTP (the transport
+    /// `pkh put` degrades to when the SSH connection never comes up)
+    ftp_host: String,
+    /// Port of the anonymous FTP upload queue
+    ftp_port: u16,
     /// Upload queue incoming directory template (`{owner}`/`{ppa}`)
     incoming_template: String,
     /// PPA package-content (apt repository) URL template
@@ -53,6 +58,13 @@ embed_data! {
     static ref LAUNCHPAD_DATA: LaunchpadData = "../data/launchpad.yml"
 }
 
+/// The PPA upload queue over anonymous FTP (host, port): the transport
+/// dput-ng's plain `ppa:` profile pushes over, and the one `pkh put`
+/// degrades to when the SSH connection itself never comes up.
+pub(crate) fn ppa_ftp_queue() -> (String, u16) {
+    (LAUNCHPAD_DATA.ftp_host.clone(), LAUNCHPAD_DATA.ftp_port)
+}
+
 /// Base URL of the Launchpad REST API
 fn api_base() -> &'static str {
     &LAUNCHPAD_DATA.api_base
@@ -422,6 +434,13 @@ mod tests {
         assert_eq!(target.login, None);
     }
 
+    /// The anonymous FTP fallback queue resolves from the same data the
+    /// dput-ng `ppa:` profile uses.
+    #[test]
+    fn ppa_ftp_queue_resolves() {
+        assert_eq!(ppa_ftp_queue(), ("ppa.launchpad.net".to_string(), 21));
+    }
+
     #[test]
     fn ppa_target_rejects_missing_separator() {
         assert!(ppa_target("just-a-name").is_err());

src/lib.rs

@@ -19,6 +19,9 @@ pub mod deb;
 pub mod debian;
 /// Obtain general information about distribution, series, etc
 pub mod distro_info;
+/// Passive interrupt state: the interrupted flag, the cleanup hook registry
+/// and the live view's reporter slot (the CLI owns the signal handling)
+pub mod interrupt;
 /// Launchpad integration: PPA upload targets and account discovery
 pub mod launchpad;
 /// Lint a source tree: lintian wrapper for full parity plus pkh-native checks (`pkh lint`)

src/main.rs

@@ -3,7 +3,6 @@ use std::io::Write;
 
 extern crate clap;
 use clap::{Command, arg, command};
-use pkh::context::ContextConfig;
 
 extern crate flate2;
 
@@ -21,6 +20,155 @@ fn current_dir_or_exit() -> std::path::PathBuf {
     }
 }
 
+/// CLI-side Ctrl+C wiring. The passive state (interrupted flag, cleanup
+/// hook registry, reporter slot) lives in `pkh::interrupt`; everything that
+/// installs, prints or exits lives here: the SIGINT handler only wakes a
+/// watchdog through a self-pipe (async-signal-safe), and the watchdog runs
+/// the whole shutdown in thread context — the live view's reporter clears
+/// the terminal, the notice is printed, further Ctrl+C is absorbed as a
+/// no-op, the cleanup hooks release their resources, and the process exits
+/// with the conventional status 130, skipping destructors.
+mod interrupt {
+    use std::sync::atomic::{AtomicBool, AtomicI32, Ordering};
+
+    /// Whether the interrupt notice has been shown; the first caller prints
+    /// it, later ones stay silent
+    static NOTICE_SHOWN: AtomicBool = AtomicBool::new(false);
+
+    /// Whether handler, self-pipe and watchdog are in place
+    static INSTALLED: AtomicBool = AtomicBool::new(false);
+
+    /// Write end of the self-pipe the signal handler wakes the watchdog
+    /// through; `-1` until [`install`] set it up
+    static SELF_PIPE_WRITE: AtomicI32 = AtomicI32::new(-1);
+
+    /// Install the process-global Ctrl+C (SIGINT) handler; idempotent.
+    ///
+    /// When the self-pipe or the watchdog cannot be set up, the default
+    /// SIGINT disposition is kept (the process dies immediately) rather
+    /// than installing a handler that could not run the shutdown.
+    pub fn install() {
+        if INSTALLED.swap(true, Ordering::SeqCst) {
+            return;
+        }
+
+        let mut fds = [0 as libc::c_int; 2];
+        // SAFETY: pipe(2) into a two-element array we own
+        if unsafe { libc::pipe(fds.as_mut_ptr()) } != 0 {
+            INSTALLED.store(false, Ordering::SeqCst);
+            return;
+        }
+        let (read_fd, write_fd) = (fds[0], fds[1]);
+
+        // The write end is used from the signal handler: non-blocking, so
+        // even a full pipe degrades to a dropped wake-up instead of
+        // blocking the handler.
+        // SAFETY: fcntl(2) on a pipe file descriptor we just created
+        unsafe {
+            let flags = libc::fcntl(write_fd, libc::F_GETFL);
+            libc::fcntl(write_fd, libc::F_SETFL, flags | libc::O_NONBLOCK);
+        }
+        SELF_PIPE_WRITE.store(write_fd, Ordering::SeqCst);
+
+        let spawned = std::thread::Builder::new()
+            .name("pkh-interrupt".to_string())
+            .spawn(move || watchdog(read_fd));
+        if spawned.is_err() {
+            // SAFETY: closing pipe file descriptors we just created
+            unsafe {
+                libc::close(read_fd);
+                libc::close(write_fd);
+            }
+            SELF_PIPE_WRITE.store(-1, Ordering::SeqCst);
+            INSTALLED.store(false, Ordering::SeqCst);
+            return;
+        }
+
+        // SAFETY: installing a signal handler whose body only records the
+        // interruption and writes to the self-pipe (async-signal-safe)
+        unsafe {
+            libc::signal(libc::SIGINT, on_sigint as *const () as usize);
+        }
+    }
+
+    /// Never returns: park the calling thread until the watchdog exits the
+    /// process
+    ///
+    /// The watchdog owns the interrupt shutdown; a caller that would
+    /// otherwise reach its own `std::process::exit` and kill the process
+    /// mid-cleanup must park here instead.
+    pub fn wait_for_shutdown() -> ! {
+        loop {
+            std::thread::sleep(std::time::Duration::from_millis(100));
+        }
+    }
+
+    /// Signal handler body: record the interruption and wake the watchdog
+    /// through the self-pipe
+    extern "C" fn on_sigint(_sig: libc::c_int) {
+        pkh::interrupt::mark_interrupted();
+        let fd = SELF_PIPE_WRITE.load(Ordering::SeqCst);
+        if fd >= 0 {
+            // SAFETY: write(2) of one byte to the self-pipe is
+            // async-signal-safe; a failed write (e.g. EAGAIN) drops the
+            // wake-up instead of blocking the handler
+            unsafe {
+                libc::write(fd, b"x".as_ptr().cast(), 1);
+            }
+        }
+    }
+
+    /// Watchdog body: block until the signal handler's byte arrives, then
+    /// run the shutdown sequence
+    fn watchdog(read_fd: libc::c_int) {
+        let mut byte = [0u8; 1];
+        // SAFETY: read(2) into a local buffer of the announced length
+        let received = unsafe { libc::read(read_fd, byte.as_mut_ptr().cast(), 1) };
+        // The write end is never closed, so a short read cannot happen in
+        // practice; on error there is nothing to clean up either way.
+        if received > 0 {
+            run_interrupt_sequence();
+        }
+    }
+
+    /// Reporter, notice, cleanup hooks, exit 130: the whole shutdown, run
+    /// in the watchdog thread immediately on Ctrl+C — never in the signal
+    /// handler itself
+    ///
+    /// Further Ctrl+C while this runs writes bytes nobody reads: absorbed
+    /// as a no-op (send SIGTERM/SIGKILL if a hook ever hangs).
+    fn run_interrupt_sequence() {
+        let hint =
+            pkh::interrupt::take_reporter().and_then(|report| {
+                match std::panic::catch_unwind(std::panic::AssertUnwindSafe(report)) {
+                    Ok(hint) => hint,
+                    Err(_) => {
+                        log::error!("Interrupt reporter panicked");
+                        None
+                    }
+                }
+            });
+        show_notice();
+        if let Some(hint) = hint {
+            eprintln!("{hint}");
+        }
+        pkh::interrupt::run_cleanup_hooks();
+        // SAFETY: raw exit bypassing destructors, intended at interrupt time
+        unsafe {
+            libc::_exit(130);
+        }
+    }
+
+    /// Print the interrupt notice, once per process: the first caller
+    /// prints it, later ones stay silent
+    fn show_notice() {
+        if NOTICE_SHOWN.swap(true, Ordering::SeqCst) {
+            return;
+        }
+        eprintln!("CTRL+C: Build interrupted by user.");
+    }
+}
+
 fn main() {
     let rt = tokio::runtime::Runtime::new().unwrap();
     let logger =
@@ -32,7 +180,6 @@ fn main() {
     LogWrapper::new(multi.clone(), logger).try_init().unwrap();
     let matches = command!()
         .subcommand_required(true)
-        .disable_version_flag(true)
         .subcommand(
             Command::new("new")
                 .about("Scaffold a new Debian source package (buildable right away)")
@@ -274,33 +421,6 @@ fn main() {
                         .help("Print the pkh-native tag catalog and exit"),
                 ),
         )
-        .subcommand(
-            Command::new("context")
-                .about("Manage contexts")
-                .subcommand_required(true)
-                .subcommand(
-                    Command::new("create")
-                        .about("Create a new context")
-                        .arg(arg!(<name> "Context name"))
-                        .arg(arg!(--type <type> "Context type: ssh (only type supported for now)"))
-                        .arg(arg!(--endpoint <endpoint> "Context endpoint (for example: ssh://user@host:port)"))
-                )
-                .subcommand(
-                    Command::new("rm")
-                        .about("Remove a context")
-                        .arg(arg!(<name> "Context name"))
-                )
-                .subcommand(
-                    Command::new("ls")
-                        .about("List contexts")
-                )
-                .subcommand(Command::new("show").about("Show current context"))
-                .subcommand(
-                    Command::new("use")
-                        .about("Set current context")
-                        .arg(arg!(<name> "Context name"))
-                )
-        )
         .subcommand(
             Command::new("prune")
                 .about("Prune residual pkh build artifacts and caches")
@@ -474,10 +594,13 @@ fn main() {
                 match rt.block_on(pkh::changelog::series_candidates(&changelog_path)) {
                     Some(pkh::changelog::SeriesCandidates::Choose {
                         options,
+                        values,
                         default,
                         fallback,
                     }) => match pkh::ui::select_series(&options, &default) {
-                        Ok(selected) => Some(selected),
+                        Ok(selected) => {
+                            Some(pkh::changelog::selected_series(&options, &values, selected))
+                        }
                         Err(e) => {
                             error!(
                                 "Series selection failed: {}. Using current series '{}' instead.",
@@ -539,6 +662,7 @@ fn main() {
         }
         Some(("build", sub_matches)) => {
             let cwd = current_dir_or_exit();
+            interrupt::install();
             let verbose = sub_matches
                 .get_one::<bool>("verbose")
                 .copied()
@@ -589,6 +713,11 @@ fn main() {
                     }
                 }
                 Err(e) => {
+                    // On Ctrl+C the interrupt watchdog owns the shutdown
+                    // (see `pkh deb`): park here instead of racing it
+                    if pkh::interrupt::interrupted() {
+                        interrupt::wait_for_shutdown();
+                    }
                     // The unmet-dependency diagnostics first, then the
                     // summary: the exact rendering the flow used to do.
                     if let Some(unmet) =
@@ -610,6 +739,7 @@ fn main() {
         }
         Some(("put", sub_matches)) => {
             let cwd = current_dir_or_exit();
+            interrupt::install();
             let ppa = sub_matches.get_one::<String>("ppa").map(|s| s.as_str());
             let changes = sub_matches
                 .get_one::<String>("changes")
@@ -639,12 +769,22 @@ fn main() {
                 prompter: &prompter,
             };
             if let Err(e) = rt.block_on(async { pkh::put::put(&options).await }) {
+                // On Ctrl+C the interrupt watchdog owns the shutdown (see
+                // `pkh deb`): park here instead of racing it
+                if pkh::interrupt::interrupted() {
+                    interrupt::wait_for_shutdown();
+                }
                 error!("{}", e);
                 std::process::exit(1);
             }
         }
         Some(("deb", sub_matches)) => {
             let cwd = current_dir_or_exit();
+            // Ctrl+C during the build must say what happened and release the
+            // ephemeral chroot instead of dying on the default disposition.
+            // The live view (when enabled) registers its own reporter on top
+            // of this to clear the widget first.
+            interrupt::install();
             let series = sub_matches.get_one::<String>("series").cloned();
             let pocket = sub_matches.get_one::<String>("pocket").cloned();
             let arch = sub_matches.get_one::<String>("arch").cloned();
@@ -711,85 +851,18 @@ fn main() {
             match result {
                 Ok(_) => info!("Done."),
                 Err(e) => {
+                    // On Ctrl+C the interrupt watchdog owns the shutdown: it
+                    // has already shown the notice, is releasing the build
+                    // resources, and will exit with 130 — park here instead
+                    // of racing it with another exit.
+                    if pkh::interrupt::interrupted() {
+                        interrupt::wait_for_shutdown();
+                    }
                     error!("{}", e);
                     std::process::exit(1);
                 }
             }
         }
-        Some(("context", sub_matches)) => {
-            let mgr = pkh::context::manager();
-
-            match sub_matches.subcommand() {
-                Some(("create", args)) => {
-                    let name = args.get_one::<String>("name").unwrap();
-                    let type_str = args
-                        .get_one::<String>("type")
-                        .map(|s| s.as_str())
-                        .unwrap_or("local");
-
-                    let context = match type_str {
-                        "local" => ContextConfig::Local,
-                        "ssh" => {
-                            let endpoint =
-                                args.get_one::<String>("endpoint").unwrap_or_else(|| {
-                                    error!(
-                                        "An --endpoint is required to create an ssh context. \
-                                         Expected format: [ssh://][user@]host[:port]"
-                                    );
-                                    std::process::exit(1);
-                                });
-
-                            match pkh::context::ContextConfig::from_endpoint(endpoint) {
-                                Ok(config) => config,
-                                Err(e) => {
-                                    error!("{e}");
-                                    std::process::exit(1);
-                                }
-                            }
-                        }
-                        _ => {
-                            error!("Unknown context type: {}", type_str);
-                            std::process::exit(1);
-                        }
-                    };
-
-                    if let Err(e) = mgr.add_context(name, context) {
-                        error!("Failed to create context: {}", e);
-                        std::process::exit(1);
-                    }
-                    info!("Context '{}' created.", name);
-                }
-                Some(("rm", args)) => {
-                    let name = args.get_one::<String>("name").unwrap();
-                    if let Err(e) = mgr.remove_context(name) {
-                        error!("Failed to remove context: {}", e);
-                        std::process::exit(1);
-                    }
-                    info!("Context '{}' removed.", name);
-                }
-                Some(("ls", _)) => {
-                    let contexts = mgr.list_contexts();
-                    let current = mgr.current_name();
-                    for ctx in contexts {
-                        if ctx == current {
-                            println!("* {}", ctx);
-                        } else {
-                            println!("  {}", ctx);
-                        }
-                    }
-                }
-                Some(("show", _)) => {}
-                Some(("use", args)) => {
-                    let name = args.get_one::<String>("name").unwrap();
-                    if let Err(e) = mgr.set_current(name) {
-                        error!("Failed to set context: {}", e);
-                        std::process::exit(1);
-                    }
-                    info!("Switched to context '{}'.", name);
-                }
-                _ => unreachable!(),
-            }
-        }
         Some(("prune", sub_matches)) => {
             let dry_run = sub_matches
                 .get_one::<bool>("dry_run")
@@ -916,3 +989,56 @@ fn main() {
         _ => unreachable!("Exhausted list of subcommands and subcommand_required prevents `None`"),
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::interrupt;
+
+    /// End-to-end check of the whole sequence: installed handler → self-pipe
+    /// → watchdog → notice + hooks → exit status 130. The sequence ends in
+    /// `libc::_exit`, so it cannot be exercised in-process: this test
+    /// re-spawns the test binary in child mode (env var), where the test
+    /// installs the handler and raises SIGINT at itself.
+    #[test]
+    fn sigint_sequence_prints_the_notice_and_exits_130() {
+        const CHILD_ENV: &str = "PKH_SIGINT_TEST_CHILD";
+        if std::env::var(CHILD_ENV).is_ok() {
+            // Child mode: install, register a pending hook, then interrupt
+            // ourselves. If the sequence never runs, the sleep below turns
+            // the failure into a wrong (zero) exit code instead of a hang.
+            interrupt::install();
+            // Alive until the watchdog drains it: a dropped guard would
+            // deregister the hook and the drain would run empty
+            let _hook = pkh::interrupt::register_cleanup_hook(Box::new(|| ()));
+            // SAFETY: kill(2) to our own process with SIGINT
+            unsafe {
+                libc::kill(libc::getpid(), libc::SIGINT);
+            }
+            std::thread::sleep(std::time::Duration::from_secs(30));
+            std::process::exit(0);
+        }
+
+        let exe = std::env::current_exe().expect("locate the test executable");
+        let output = std::process::Command::new(exe)
+            // --nocapture: libtest's capture buffer would otherwise swallow
+            // the watchdog's notice (threads spawned during a test inherit
+            // the capture), and the process exits before the harness prints
+            // anything it captured
+            .args([
+                "--exact",
+                "tests::sigint_sequence_prints_the_notice_and_exits_130",
+                "--test-threads=1",
+                "--nocapture",
+            ])
+            .env(CHILD_ENV, "1")
+            .output()
+            .expect("re-spawn the test binary");
+
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        assert_eq!(output.status.code(), Some(130), "child stderr:\n{stderr}");
+        assert!(
+            stderr.contains("CTRL+C: Build interrupted by user."),
+            "child stderr:\n{stderr}"
+        );
+    }
+}

src/pull.rs

@@ -452,15 +452,18 @@ async fn fetch_orig_tarball(
         Path::new(&info.stanza.package).to_path_buf()
     };
 
-    // Find the orig tarball in the file list
-    // Usually ends with .orig.tar.gz or .orig.tar.xz
-    let orig_file = info
+    // Upstream tarballs in the file list: the main orig tarball plus, for
+    // multi-orig ("3.0 (quilt)" extra-component) sources, one component
+    // tarball per bundled module (`*.orig-<component>.tar.<ext>`). dpkg-source
+    // unpacks all of them side by side, so a git pull must fetch them all.
+    let orig_files: Vec<_> = info
         .stanza
         .files
         .iter()
-        .find(|f| f.name.contains(".orig.tar."))
-        .ok_or_else(|| {
-            format!(
+        .filter(|f| crate::build::changes::is_orig_tarball(&f.name))
+        .collect();
+    if orig_files.is_empty() {
+        return Err(format!(
             "Could not find orig tarball in file list for package '{}'. \
              Available files: {:?}",
             info.stanza.package,
@@ -470,14 +473,17 @@ async fn fetch_orig_tarball(
                 .map(|f| &f.name)
                 .collect::<Vec<_>>()
         )
-        })?;
-    let filename = &orig_file.name;
+        .into());
+    }
 
     // 1. Try executing pristine-tar
 
     // Setup pristine-tar branch if needed (by tracking remote branch)
     let _ = setup_pristine_tar_branch(&package_dir, info.dist.as_str());
 
+    for orig_file in orig_files {
+        let filename = &orig_file.name;
+
         if let Err(e) = checkout_pristine_tar(&package_dir, filename.as_str()) {
             debug!(
                 "pristine-tar failed: {}. Falling back to archive download.",
@@ -497,6 +503,7 @@ async fn fetch_orig_tarball(
             )
             .await?;
         }
+    }
 
     Ok(())
 }
@@ -844,23 +851,29 @@ mod tests {
             }
         }
 
-        // Check for orig tarball in package dir (only for non-native packages)
-        let mut found_tarball = false;
+        // Check for the orig tarballs in the package dir (only for non-native
+        // packages): every orig listed in the stanza must be present, including
+        // the component tarballs of multi-orig packages (dpkg-source needs them
+        // all to unpack the merged upstream tree)
         let mut found_dsc = false;
-        for entry in std::fs::read_dir(package_dir).unwrap() {
+        for entry in std::fs::read_dir(&package_dir).unwrap() {
             let entry = entry.unwrap();
             let name = entry.file_name().to_string_lossy().to_string();
-            if name.contains(".orig.tar.") {
-                found_tarball = true;
-            }
             if name.ends_with(".dsc") {
                 found_dsc = true;
             }
         }
 
-        // Only check for orig tarball if the package is not native
         if !info.is_native() {
-            assert!(found_tarball, "Orig tarball not found in package dir");
+            for file in &info.stanza.files {
+                if crate::build::changes::is_orig_tarball(&file.name) {
+                    assert!(
+                        package_dir.join(&file.name).exists(),
+                        "Orig tarball '{}' not found in package dir",
+                        file.name
+                    );
+                }
+            }
         }
         assert!(found_dsc, "DSC file not found in package dir");
     }
@@ -914,6 +927,17 @@ mod tests {
         test_pull_package_end_to_end("paraview", Some("noble"), None, None).await;
     }
 
+    /// Multi-orig ("3.0 (quilt)" extra component) regression test: node-jest
+    /// ships its bundled modules as separate `*.orig-<component>.tar.xz`
+    /// tarballs next to the main orig. The git pull path must fetch every
+    /// component, or the later `dpkg-source -b` quilt verification fails
+    /// with "can't find file to patch" on the first patch touching a
+    /// component directory.
+    #[tokio::test]
+    async fn test_pull_node_jest_debian_end_to_end() {
+        test_pull_package_end_to_end("node-jest", Some("trixie"), None, None).await;
+    }
+
     /// Build a minimal uncompressed ustar archive from (name, data) entries.
     ///
     /// Raw header blocks are crafted instead of using `tar::Builder` because

src/put/ftp.rs

@@ -0,0 +1,456 @@
+//! Anonymous FTP transport for the Launchpad PPA upload queue: the graceful
+//! degradation of the SFTP transport when the SSH connection itself never
+//! comes up (name resolution, TCP, banner or key exchange). dput-ng's plain
+//! `ppa:user/ppa` profile pushes over this same queue — ppa.launchpad.net
+//! over FTP, anonymous login, incoming `~user/ppa` — so it is the
+//! interoperability-tested path.
+//!
+//! The client is [`suppaftp`]'s (plain-FTP, no TLS) blocking stream on the
+//! same time-bounded sockets as the ssh2 transport: the TCP connect and
+//! the control/data channel reads and writes all carry timeouts, so a
+//! black-holed or stalled server fails the upload instead of hanging it
+//! (suppaftp's defaults do not bound them). The upload order (payload
+//! first, `.changes` last — the caller passes the files in that order) and
+//! the best-effort cleanup of a failed upload (`DELE` of what was already
+//! pushed, in reverse upload order) mirror the SFTP path exactly.
+
+use std::fs::File;
+use std::io::{Read, Write};
+use std::net::{SocketAddr, TcpStream};
+use std::path::{Path, PathBuf};
+use std::time::Duration;
+
+use suppaftp::types::FileType;
+use suppaftp::{FtpError, FtpStream};
+
+use super::ssh;
+
+/// Bounds one TCP connection attempt, to the control channel or a passive
+/// data port: `connect(2)` would otherwise block for minutes (or forever,
+/// behind a silent firewall). Generous enough for slow links to Launchpad,
+/// short enough that a dead target fails in seconds — the same value and
+/// rationale as the SSH path's bound.
+const TCP_CONNECT_TIMEOUT: Duration = Duration::from_secs(15);
+
+/// Read/write timeout on the control channel: every reply is a few bytes,
+/// so a stalled server has had its say by the time this expires.
+const CONTROL_TIMEOUT: Duration = Duration::from_secs(60);
+
+/// Write timeout of one data-transfer chunk: the clock restarts at every
+/// write, so the wall-clock duration of a large upload is not bounded by
+/// design — but a black-holed data connection fails one chunk after this
+/// budget.
+const DATA_TIMEOUT: Duration = Duration::from_secs(120);
+
+/// Data transfers stream in chunks of this size.
+const CHUNK_SIZE: usize = 32 * 1024;
+
+/// Upload `files` to the `incoming` queue of `host:port` over anonymous FTP,
+/// in the order given (payload first, `.changes` last — the queue processor
+/// must never observe a `.changes` without its payload).
+/// `on_progress(name, uploaded_bytes, total_bytes)` reports progress.
+///
+/// A failure mid-upload best-effort removes what was already pushed (`DELE`,
+/// reverse upload order — a lingering payload in the write-only queue area
+/// is only hygiene) before returning the original error, like the SFTP
+/// path's [`super::cleanup_partial_upload`].
+pub fn upload_queue(
+    host: &str,
+    port: u16,
+    incoming: &str,
+    files: &[(PathBuf, String)],
+    on_progress: &dyn Fn(&str, u64, u64),
+) -> Result<(), Box<dyn std::error::Error>> {
+    let mut ftp = connect(host, port)?;
+    let who = std::env::var("USER").unwrap_or_else(|_| "anonymous".to_string());
+    ftp.login("anonymous".to_string(), format!("{who}@pkh.invalid"))
+        .map_err(|e| format!("the FTP queue rejected the anonymous login: {e}"))?;
+    ftp.cwd(incoming)
+        .map_err(|e| format!("cannot enter the upload queue '{incoming}': {e}"))?;
+    ftp.transfer_type(FileType::Binary)
+        .map_err(|e| format!("the FTP queue refused binary transfers: {e}"))?;
+
+    // Remote names pushed so far, in upload order, for the cleanup
+    let mut uploaded: Vec<String> = Vec::new();
+    for (path, name) in files {
+        if let Err(e) = store(&mut ftp, path, name, on_progress) {
+            // The failed file itself joins the cleanup: its `STOR` was
+            // accepted before the transfer failure, so a partial may be
+            // sitting in the queue
+            for leftover in super::cleanup_list(&uploaded, Some(name)) {
+                match ftp.rm(leftover.as_str()) {
+                    Ok(()) => {
+                        log::info!("Removed leftover {leftover} from the failed upload")
+                    }
+                    Err(e) => log::warn!(
+                        "Could not remove the leftover {leftover} of the \
+                         failed upload: {e}"
+                    ),
+                }
+            }
+            return Err(e);
+        }
+        uploaded.push(name.clone());
+    }
+
+    // Best effort: the queue keeps what it accepted, so a failure here must
+    // not fail a completed upload
+    if let Err(e) = ftp.quit() {
+        log::debug!("closing the FTP session: {e}");
+    }
+    Ok(())
+}
+
+/// Connect to the queue, read its banner and set every time bound and
+/// workaround the plain suppaftp stream does not carry by itself.
+fn connect(host: &str, port: u16) -> Result<FtpStream, Box<dyn std::error::Error>> {
+    let tcp = ssh::tcp_connect(host, port)?;
+    let mut ftp = FtpStream::connect_with_stream(tcp)?.passive_stream_builder(data_connect);
+    {
+        let control = ftp.get_ref();
+        control.set_read_timeout(Some(CONTROL_TIMEOUT))?;
+        control.set_write_timeout(Some(CONTROL_TIMEOUT))?;
+    }
+    // A `PASV` reply announcing an unroutable address (a server behind NAT
+    // that does not know its public IP) means the control connection's peer
+    ftp.set_passive_nat_workaround(true);
+    Ok(ftp)
+}
+
+/// The passive data-channel connect: bounded like every other network call,
+/// where suppaftp's default builder is a plain, unbounded
+/// `TcpStream::connect`.
+fn data_connect(addr: SocketAddr) -> Result<TcpStream, FtpError> {
+    TcpStream::connect_timeout(&addr, TCP_CONNECT_TIMEOUT).map_err(FtpError::ConnectionError)
+}
+
+/// Upload `path` as `name` over a passive data connection, reporting
+/// progress through `on_progress` per chunk. `finish` reads the transfer
+/// completion reply — the only way to learn the server accepted the file.
+fn store(
+    ftp: &mut FtpStream,
+    path: &Path,
+    name: &str,
+    on_progress: &dyn Fn(&str, u64, u64),
+) -> Result<(), Box<dyn std::error::Error>> {
+    let mut upload = ftp
+        .put_with_stream(name)
+        .map_err(|e| format!("the FTP queue rejected '{name}': {e}"))?;
+    if let suppaftp::DataStream::Tcp(socket) = upload.get_mut() {
+        socket.set_write_timeout(Some(DATA_TIMEOUT))?;
+    }
+
+    let mut file =
+        File::open(path).map_err(|e| format!("cannot read '{}': {e}", path.display()))?;
+    let total = file.metadata().map(|m| m.len()).unwrap_or(0);
+    let mut buffer = vec![0u8; CHUNK_SIZE];
+    let mut uploaded: u64 = 0;
+    loop {
+        let read = file.read(&mut buffer)?;
+        if read == 0 {
+            break;
+        }
+        upload.write_all(&buffer[..read])?;
+        uploaded += read as u64;
+        on_progress(name, uploaded, total);
+    }
+    upload
+        .finish()
+        .map_err(|e| format!("upload of '{name}' failed: {e}"))?;
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::collections::HashMap;
+    use std::net::TcpListener;
+    use std::sync::Arc;
+    use std::sync::atomic::{AtomicUsize, Ordering};
+
+    use parking_lot::Mutex;
+
+    /// In-process fake of the Launchpad FTP upload queue: one control
+    /// session speaking the protocol subset the client uses (banner,
+    /// USER/PASS, CWD, TYPE, PASV, STOR, DELE, QUIT). Records every
+    /// command, stores received bytes under the `STOR` name, and can be
+    /// told to reject one `STOR` (by index) to exercise the cleanup. Its
+    /// `PASV` replies announce `0.0.0.0`, the NAT form, so the
+    /// happy-path test proves the control-peer fallback too.
+    struct FakeQueue {
+        addr: SocketAddr,
+        commands: Arc<Mutex<Vec<String>>>,
+        files: Arc<Mutex<HashMap<String, Vec<u8>>>>,
+    }
+
+    impl FakeQueue {
+        /// Serve one session on a background thread, greeting it with
+        /// `banner` and rejecting the `STOR` number `reject_stor`, when
+        /// set.
+        fn start(banner: &str, reject_stor: Option<usize>) -> FakeQueue {
+            let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+            let addr = listener.local_addr().unwrap();
+            let commands = Arc::new(Mutex::new(Vec::new()));
+            let files = Arc::new(Mutex::new(HashMap::new()));
+            let (c, f) = (Arc::clone(&commands), Arc::clone(&files));
+            let banner = banner.to_string();
+            std::thread::spawn(move || serve(listener, &banner, c, f, reject_stor));
+            FakeQueue {
+                addr,
+                commands,
+                files,
+            }
+        }
+    }
+
+    fn serve(
+        listener: TcpListener,
+        banner: &str,
+        commands: Arc<Mutex<Vec<String>>>,
+        files: Arc<Mutex<HashMap<String, Vec<u8>>>>,
+        reject_stor: Option<usize>,
+    ) {
+        use std::io::BufRead;
+
+        let (stream, _) = listener.accept().unwrap();
+        let mut reader = std::io::BufReader::new(stream.try_clone().unwrap());
+        let mut writer = stream;
+        writer
+            .write_all(format!("{banner}\r\n").as_bytes())
+            .unwrap();
+
+        let mut pending_data: Option<TcpListener> = None;
+        let stor_index = AtomicUsize::new(0);
+        loop {
+            let mut line = String::new();
+            if reader.read_line(&mut line).unwrap_or(0) == 0 {
+                break;
+            }
+            let cmd = line.trim_end().to_string();
+            commands.lock().push(cmd.clone());
+            let (verb, arg) = cmd.split_once(' ').unwrap_or((cmd.as_str(), ""));
+            match verb {
+                "USER" | "PASS" => {
+                    writer
+                        .write_all(b"230 Anonymous login ok, access restrictions apply.\r\n")
+                        .unwrap();
+                }
+                "CWD" => {
+                    writer.write_all(b"250 Command successful\r\n").unwrap();
+                }
+                "TYPE" => {
+                    writer.write_all(b"200 Type set to I\r\n").unwrap();
+                }
+                "PASV" => {
+                    let data = TcpListener::bind("127.0.0.1:0").unwrap();
+                    let port = data.local_addr().unwrap().port();
+                    writer
+                        .write_all(
+                            format!(
+                                "227 Entering Passive Mode (0,0,0,0,{},{})\r\n",
+                                port / 256,
+                                port % 256
+                            )
+                            .as_bytes(),
+                        )
+                        .unwrap();
+                    pending_data = Some(data);
+                }
+                "STOR" => {
+                    let index = stor_index.fetch_add(1, Ordering::SeqCst);
+                    if Some(index) == reject_stor {
+                        writer.write_all(b"550 Permission denied\r\n").unwrap();
+                        continue;
+                    }
+                    writer.write_all(b"150 Ok to send data\r\n").unwrap();
+                    let (mut data, _) = pending_data.take().unwrap().accept().unwrap();
+                    let mut bytes = Vec::new();
+                    data.read_to_end(&mut bytes).unwrap();
+                    files.lock().insert(arg.to_string(), bytes);
+                    writer.write_all(b"226 Transfer complete\r\n").unwrap();
+                }
+                "DELE" => {
+                    if files.lock().remove(arg).is_some() {
+                        writer.write_all(b"250 File deleted\r\n").unwrap();
+                    } else {
+                        writer.write_all(b"550 No such file\r\n").unwrap();
+                    }
+                }
+                "QUIT" => {
+                    writer.write_all(b"221 Bye\r\n").unwrap();
+                    break;
+                }
+                other => {
+                    writer
+                        .write_all(format!("502 Command '{other}' not implemented\r\n").as_bytes())
+                        .unwrap();
+                }
+            }
+        }
+    }
+
+    /// A temp file with `content`, to upload.
+    fn upload_file(dir: &Path, name: &str, content: &[u8]) -> (PathBuf, String) {
+        let path = dir.join(name);
+        std::fs::write(&path, content).unwrap();
+        (path, name.to_string())
+    }
+
+    /// The full push: anonymous login, the queue directory entered,
+    /// payload files uploaded in order before the `.changes`, their bytes
+    /// intact, and progress reported up to each file's size.
+    #[test]
+    fn upload_queue_pushes_payload_before_changes() {
+        let queue = FakeQueue::start("220 Launchpad upload server", None);
+        let dir = tempfile::tempdir().unwrap();
+        let files = vec![
+            upload_file(dir.path(), "pkg_1.0.orig.tar.xz", b"orig bytes"),
+            upload_file(dir.path(), "pkg_1.0-1.dsc", b"dsc bytes"),
+            upload_file(dir.path(), "pkg_1.0-1_source.changes", b"changes bytes"),
+        ];
+        let seen = Arc::new(Mutex::new(Vec::new()));
+        let progress_log = Arc::clone(&seen);
+
+        upload_queue(
+            "127.0.0.1",
+            queue.addr.port(),
+            "~vhaudiquet/lp2167827",
+            &files,
+            &|name, uploaded, total| {
+                progress_log
+                    .lock()
+                    .push((name.to_string(), uploaded, total))
+            },
+        )
+        .unwrap();
+
+        let commands = queue.commands.lock().clone();
+        assert_eq!(
+            commands[0], "USER anonymous",
+            "the anonymous login comes first"
+        );
+        assert_eq!(
+            commands
+                .iter()
+                .filter(|c| c == &"CWD ~vhaudiquet/lp2167827")
+                .count(),
+            1
+        );
+        let cwd = commands.iter().position(|c| c.starts_with("CWD")).unwrap();
+        let first_stor = commands.iter().position(|c| c.starts_with("STOR")).unwrap();
+        assert!(cwd < first_stor, "the queue directory is entered first");
+        assert!(
+            commands.iter().any(|c| c == "TYPE I"),
+            "binary transfers are requested"
+        );
+        // Upload order: the payload first, the .changes last
+        let stors: Vec<&String> = commands.iter().filter(|c| c.starts_with("STOR")).collect();
+        assert_eq!(
+            stors.iter().map(|s| s.as_str()).collect::<Vec<_>>(),
+            vec![
+                "STOR pkg_1.0.orig.tar.xz",
+                "STOR pkg_1.0-1.dsc",
+                "STOR pkg_1.0-1_source.changes",
+            ]
+        );
+        assert_eq!(*commands.last().unwrap(), "QUIT");
+
+        // The received bytes are intact
+        let stored = queue.files.lock();
+        assert_eq!(stored.get("pkg_1.0.orig.tar.xz").unwrap(), b"orig bytes");
+        assert_eq!(stored.get("pkg_1.0-1.dsc").unwrap(), b"dsc bytes");
+        assert_eq!(
+            stored.get("pkg_1.0-1_source.changes").unwrap(),
+            b"changes bytes"
+        );
+
+        // Progress reached each file's size
+        let progress = seen.lock();
+        for (path, name) in &files {
+            let size = path.metadata().unwrap().len();
+            let reached = progress
+                .iter()
+                .any(|(n, uploaded, total)| n == name && *uploaded == size && *total == size);
+            assert!(reached, "no progress report completed for '{name}'");
+        }
+    }
+
+    /// A `STOR` the queue rejects fails the upload, and the client removes
+    /// what it already pushed — the failed file first, then the earlier
+    /// payloads, in reverse upload order — before returning the error.
+    #[test]
+    fn upload_queue_cleans_up_after_a_rejected_stor() {
+        let queue = FakeQueue::start("220 Launchpad upload server", Some(1));
+        let dir = tempfile::tempdir().unwrap();
+        let files = vec![
+            upload_file(dir.path(), "one.dsc", b"one"),
+            upload_file(dir.path(), "two.tar.xz", b"two"),
+            upload_file(dir.path(), "three.changes", b"three"),
+        ];
+
+        let err = upload_queue(
+            "127.0.0.1",
+            queue.addr.port(),
+            "~user/ppa",
+            &files,
+            &|_, _, _| {},
+        )
+        .unwrap_err();
+        assert!(
+            err.to_string().contains("rejected 'two.tar.xz'"),
+            "the error names the rejected file, got: {err}"
+        );
+
+        let commands = queue.commands.lock();
+        let deles: Vec<&String> = commands.iter().filter(|c| c.starts_with("DELE")).collect();
+        assert_eq!(
+            deles.iter().map(|d| d.as_str()).collect::<Vec<_>>(),
+            vec!["DELE two.tar.xz", "DELE one.dsc"],
+            "the failed file is removed first, then the earlier payloads"
+        );
+        let files = queue.files.lock();
+        assert!(
+            !files.contains_key("one.dsc"),
+            "the pushed payload is removed"
+        );
+        assert!(!files.contains_key("three.changes"), "never reached");
+    }
+
+    /// A multi-line banner (`220-first` closed by `220 last`) parses like
+    /// the single-line form.
+    #[test]
+    fn upload_queue_reads_multiline_replies() {
+        let queue = FakeQueue::start("220-Launchpad\r\n220 upload server", None);
+        let dir = tempfile::tempdir().unwrap();
+        let files = vec![upload_file(dir.path(), "pkg.dsc", b"bytes")];
+
+        upload_queue(
+            "127.0.0.1",
+            queue.addr.port(),
+            "~user/ppa",
+            &files,
+            &|_, _, _| {},
+        )
+        .unwrap();
+
+        let stored = queue.files.lock();
+        assert_eq!(stored.get("pkg.dsc").unwrap(), b"bytes");
+    }
+
+    /// Live control-channel handshake with the real Launchpad FTP queue:
+    /// banner, anonymous login and a `CWD` — nothing is uploaded, the
+    /// queue is left untouched. For deliberate ad-hoc runs
+    /// (`cargo test -- --ignored`), not the pre-commit pass: it hits the
+    /// network.
+    #[test]
+    #[ignore = "hits the network: the real Launchpad FTP queue"]
+    fn live_launchpad_control_channel() {
+        let (host, port) = crate::launchpad::ppa_ftp_queue();
+        assert_eq!((host.as_str(), port), ("ppa.launchpad.net", 21));
+
+        let mut ftp = connect(&host, port).unwrap();
+        ftp.login("anonymous", "pkh@invalid").unwrap();
+        ftp.cwd("/").unwrap();
+        ftp.quit().unwrap();
+    }
+}

src/put/mod.rs

@@ -1,17 +1,12 @@
-//! Native upload of built source packages (`pkh put`): the dput
-//! replacement. Resolves the upload target, discovers and validates the
-//! `.changes` file and its artifacts, then pushes them over SFTP with
-//! host-key verification and an upload record preventing accidental
-//! duplicate uploads.
-//!
-//! Payload files are uploaded first and the `.changes` file last, like
-//! dput does, so a partially uploaded set cannot be picked up by the
-//! server-side queue processors. A run that fails mid-upload removes its
-//! already-uploaded files from the incoming queue (best effort), so a
-//! retried upload starts from a clean queue; a failed upload is never
-//! recorded in the upload log, so a re-run replays every file.
+//! PPA upload: the dput replacement. Resolves the upload target, discovers
+//! and validates the `.changes` file and its artifacts, then pushes them
+//! over SFTP with host-key verification and an upload record preventing
+//! accidental duplicate uploads. When the SSH connection itself never
+//! comes up, the upload degrades to the anonymous FTP queue — the
+//! transport dput's plain `ppa:` profiles use — through [`ftp`].
 
 pub mod changes;
+pub mod ftp;
 pub mod ssh;
 pub mod target;
 
@@ -139,11 +134,6 @@ async fn put_impl(opts: &PutOptions<'_>) -> Result<(), Box<dyn std::error::Error
         .into());
     }
 
-    opts.view
-        .message(&format!("Connecting to {login}@{host}:{port}..."));
-    let session = ssh::connect(&host, port, &login, &ssh_config, opts.prompter)?;
-    let sftp = ssh::sftp(&session)?;
-
     // Payload first, the .changes file last (like dput), so the server-side
     // queue processor can never pick up an incomplete upload
     let dir = changes_path.parent().unwrap_or_else(|| Path::new("."));
@@ -157,48 +147,50 @@ async fn put_impl(opts: &PutOptions<'_>) -> Result<(), Box<dyn std::error::Error
         .and_then(|n| n.to_str())
         .ok_or_else(|| format!("invalid .changes path: {}", changes_path.display()))?
         .to_string();
-    uploads.push((changes_path.clone(), changes_name.clone()));
+    uploads.push((changes_path.clone(), changes_name));
 
     let incoming = target.incoming.trim_end_matches('/');
 
-    // Remote names of the files uploaded so far, in upload order (the
-    // .changes last). A run failing mid-upload removes these from the
-    // write-only incoming queue before returning: the uploaded payloads
-    // would otherwise linger in the queue area forever, and a .changes
-    // truncated by a failed close could even be picked up by the scanner.
-    let mut uploaded: Vec<String> = Vec::new();
-
-    for (path, name) in &uploads {
-        let size = match path.metadata() {
-            Ok(metadata) => metadata.len(),
-            Err(e) => {
-                // Nothing was attempted for this file: only what earlier
-                // iterations uploaded needs removing
-                let error: Box<dyn std::error::Error> =
-                    format!("cannot stat '{}': {}", path.display(), e).into();
-                cleanup_partial_upload(&sftp, incoming, &uploaded, None, &host);
-                return Err(error);
+    // The upload queue is SFTP first, degrading to the anonymous FTP
+    // queue when the SSH connection itself never comes up (name
+    // resolution, TCP, banner or key exchange): dput pushes PPAs over
+    // that FTP queue by default, so it is the interoperability-tested
+    // fallback. A server that answers but refuses the upload (host key
+    // not accepted, no matching key) stays an error: silently switching
+    // transport would bypass the refusal.
+    opts.view
+        .message(&format!("Connecting to {login}@{host}:{port}..."));
+    let transfer = match ssh::connect(&host, port, &login, &ssh_config, opts.prompter) {
+        Ok(session) => sftp_transfer(&session, &uploads, incoming, &host, opts.view),
+        Err(ssh::ConnectFailure::Transport(e)) => {
+            log::warn!("SSH transport to {host}:{port} failed: {e}");
+            let (ftp_host, ftp_port) = launchpad::ppa_ftp_queue();
+            opts.view.message(&format!(
+                "Falling back to the anonymous FTP queue on {ftp_host}:{ftp_port} \
+                 (dput's upload method)..."
+            ));
+            ftp::upload_queue(
+                &ftp_host,
+                ftp_port,
+                incoming,
+                &uploads,
+                &|name, uploaded, total| {
+                    opts.view.progress(
+                        &format!("Uploading {name}"),
+                        uploaded as usize,
+                        total as usize,
+                    );
+                },
+            )
         }
+        Err(ssh::ConnectFailure::Refused(e)) => return Err(e),
     };
-        let remote = format!("{incoming}/{name}");
-        let label = format!("Uploading {name}");
-        let view = opts.view;
-        let on_progress = |uploaded: u64| view.progress(&label, uploaded as usize, size as usize);
-        let result = ssh::upload_file(&sftp, path, &remote, &host, &on_progress);
-        if let Err(e) = result {
-            // The failed file itself joins the cleanup: its remote `create`
-            // may have succeeded before the failure, leaving a partial — or,
-            // on a failed close, a truncated — file behind
-            cleanup_partial_upload(&sftp, incoming, &uploaded, Some(name), &host);
-            return Err(e);
-        }
-        uploaded.push(name.clone());
-    }
+    transfer?;
 
     // Recorded only once the whole upload succeeded: the log backs the
     // duplicate-upload guard, and a failed upload must not count as
-    // uploaded (a re-run replays every file — `sftp.create` truncates, so
-    // replaying is safe).
+    // uploaded (a re-run replays every file — `sftp.create` truncates and
+    // the FTP `STOR` overwrites, so replaying is safe).
     record_upload(&upload_log_path()?, &record)?;
 
     info!(
@@ -212,6 +204,54 @@ async fn put_impl(opts: &PutOptions<'_>) -> Result<(), Box<dyn std::error::Error
     Ok(())
 }
 
+/// Push `uploads` over SFTP: payload files first, the `.changes` last
+/// (like dput), so the server-side queue processor can never pick up an
+/// incomplete upload. Best-effort removal of a partial upload, mirroring
+/// the FTP transport's `DELE` cleanup ([`ftp::upload_queue`]).
+fn sftp_transfer(
+    session: &ssh2::Session,
+    uploads: &[(PathBuf, String)],
+    incoming: &str,
+    host: &str,
+    view: &dyn BuildView,
+) -> Result<(), Box<dyn std::error::Error>> {
+    let sftp = ssh::sftp(session)?;
+
+    // Remote names of the files uploaded so far, in upload order (the
+    // .changes last). A run failing mid-upload removes these from the
+    // write-only incoming queue before returning: the uploaded payloads
+    // would otherwise linger in the queue area forever, and a .changes
+    // truncated by a failed close could even be picked up by the scanner.
+    let mut uploaded: Vec<String> = Vec::new();
+
+    for (path, name) in uploads {
+        let size = match path.metadata() {
+            Ok(metadata) => metadata.len(),
+            Err(e) => {
+                // Nothing was attempted for this file: only what earlier
+                // iterations uploaded needs removing
+                let error: Box<dyn std::error::Error> =
+                    format!("cannot stat '{}': {}", path.display(), e).into();
+                cleanup_partial_upload(&sftp, incoming, &uploaded, None, host);
+                return Err(error);
+            }
+        };
+        let remote = format!("{incoming}/{name}");
+        let label = format!("Uploading {name}");
+        let on_progress = |uploaded: u64| view.progress(&label, uploaded as usize, size as usize);
+        let result = ssh::upload_file(&sftp, path, &remote, host, &on_progress);
+        if let Err(e) = result {
+            // The failed file itself joins the cleanup: its remote `create`
+            // may have succeeded before the failure, leaving a partial — or,
+            // on a failed close, a truncated — file behind
+            cleanup_partial_upload(&sftp, incoming, &uploaded, Some(name), host);
+            return Err(e);
+        }
+        uploaded.push(name.clone());
+    }
+    Ok(())
+}
+
 /// The remote names to attempt removing after a failed upload: everything
 /// already uploaded plus, when set, `failed` (the file whose upload just
 /// failed — its remote `create` may have succeeded before the failure,
@@ -219,8 +259,9 @@ async fn put_impl(opts: &PutOptions<'_>) -> Result<(), Box<dyn std::error::Error
 /// so a `.changes` is removed before the payloads it references and the
 /// queue scanner never observes the payload set shrinking under a
 /// still-present `.changes`. Pure so the ordering decision is testable
-/// without a server; the network side is [`cleanup_partial_upload`].
-fn cleanup_list(uploaded: &[String], failed: Option<&str>) -> Vec<String> {
+/// without a server; the network sides are [`cleanup_partial_upload`] and
+/// the FTP transport's `DELE` loop ([`ftp`]).
+pub(crate) fn cleanup_list(uploaded: &[String], failed: Option<&str>) -> Vec<String> {
     let mut names: Vec<String> = uploaded.to_vec();
     if let Some(failed) = failed {
         names.push(failed.to_string());

src/put/ssh.rs

@@ -253,7 +253,9 @@ fn duration_ms(timeout: Duration) -> u32 {
 /// address in order (like `TcpStream::connect` does) with
 /// [`TCP_CONNECT_TIMEOUT`] per attempt instead of blocking indefinitely.
 /// Fails with a message naming the target and every per-address error.
-fn tcp_connect(host: &str, port: u16) -> Result<TcpStream, String> {
+/// Also the TCP layer of the anonymous FTP fallback transport
+/// ([`super::ftp`]), whose connection semantics are identical.
+pub(crate) fn tcp_connect(host: &str, port: u16) -> Result<TcpStream, String> {
     let addrs: Vec<SocketAddr> = (host, port)
         .to_socket_addrs()
         .map_err(|e| format!("cannot resolve {host}:{port}: {e}"))?
@@ -292,6 +294,39 @@ fn connect_failed_message(
         attempts.len()
     )
 }
+/// Why establishing the SSH session failed.
+///
+/// [`Transport`] failures mean the connection never came up (name
+/// resolution, TCP, banner or key exchange): the target may still be
+/// reachable over another transport, so `pkh put` degrades to the
+/// anonymous FTP queue — dput's default for PPAs ([`super::ftp`]).
+/// [`Refused`] failures mean the server answered but rejected the
+/// upload (host key not accepted, no matching authentication): silently
+/// switching to anonymous FTP would bypass a refusal, so they stay
+/// errors.
+#[derive(Debug)]
+pub enum ConnectFailure {
+    /// The connection itself never came up.
+    Transport(Box<dyn std::error::Error>),
+    /// The server answered but rejected the upload.
+    Refused(Box<dyn std::error::Error>),
+}
+
+impl std::fmt::Display for ConnectFailure {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            ConnectFailure::Transport(e) | ConnectFailure::Refused(e) => write!(f, "{e}"),
+        }
+    }
+}
+
+impl std::error::Error for ConnectFailure {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            ConnectFailure::Transport(e) | ConnectFailure::Refused(e) => Some(e.as_ref()),
+        }
+    }
+}
 
 /// Connect to `host:port`, verify the server host key and authenticate as
 /// `login`: every ssh-agent identity first, then the configured and default
@@ -303,10 +338,13 @@ pub fn connect(
     login: &str,
     config: &SshConfig,
     prompter: &dyn Prompter,
-) -> Result<Session, Box<dyn std::error::Error>> {
-    let tcp = tcp_connect(host, port)?;
+) -> Result<Session, ConnectFailure> {
+    use ConnectFailure::*;
 
-    let mut session = Session::new()?;
+    let tcp = tcp_connect(host, port).map_err(|e| Transport(e.into()))?;
+
+    let mut session = Session::new()
+        .map_err(|e| Transport(format!("cannot initialize the SSH session: {e}").into()))?;
     // In blocking mode (the libssh2 default), a call that would block loops
     // in `_libssh2_wait_socket` (via the `BLOCK_ADJUST` macros of
     // session.h in the vendored libssh2-sys sources), which bounds the
@@ -321,14 +359,14 @@ pub fn connect(
     session.set_tcp_stream(tcp);
     session
         .handshake()
-        .map_err(|e| format!("SSH handshake with {host} failed: {e}"))?;
+        .map_err(|e| Transport(format!("SSH handshake with {host} failed: {e}").into()))?;
 
     let (key, key_type) = session
         .host_key()
-        .ok_or_else(|| format!("{host} offered no host key"))?;
-    verify_host_key(host, port, key, key_type, prompter)?;
+        .ok_or_else(|| Transport(format!("{host} offered no host key").into()))?;
+    verify_host_key(host, port, key, key_type, prompter).map_err(Refused)?;
 
-    authenticate(&session, host, login, config)?;
+    authenticate(&session, host, login, config).map_err(Refused)?;
 
     // Only SFTP open/data calls remain on this session: switch from the
     // connection-phase budget to the generous per-call transfer one

src/quirks.rs

@@ -4,15 +4,46 @@
 //! and apply them during pull and deb operations.
 
 use crate::data::embed_data;
+use crate::debian::deps::{Deps, ParseOpts, PkgRelation};
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 
+/// Build-dependency resolution rules for a package
+///
+/// Applied after the declared Build-* fields are parsed and reduced,
+/// before the resolver derives anything from them. Dependency strings
+/// use the full dependency grammar: `name[:arch] [(op version)]
+/// [arches] <restrictions>`.
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+pub struct DependencyQuirks {
+    /// Declared dependency name -> dependency string to resolve in its
+    /// place. The replacement is parsed fresh and replaces the declared
+    /// dependency wholesale (qualifier, version, restrictions).
+    #[serde(default)]
+    pub replace: HashMap<String, String>,
+
+    /// Dependencies to resolve as if the control declared them.
+    #[serde(default)]
+    pub inject: Vec<String>,
+
+    /// Declared dependency names to ignore.
+    #[serde(default)]
+    pub drop: Vec<String>,
+}
+
 /// Quirks configuration for a specific operation (pull or deb)
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct OperationQuirks {
-    /// Extra dependencies to install before the operation
+    /// Series the entry applies to. An empty list applies to every
+    /// series; packaging workarounds should carry the series they were
+    /// verified against, so they can be dropped once the upstream
+    /// packaging catches up.
     #[serde(default)]
-    pub extra_dependencies: Vec<String>,
+    pub series: Vec<String>,
+
+    /// Build-dependency resolution rules.
+    #[serde(default)]
+    pub dependencies: Option<DependencyQuirks>,
 
     /// Additional parameters for the operation
     #[serde(default)]
@@ -26,15 +57,19 @@ pub struct OperationQuirks {
 }
 
 /// Quirks for a specific package
+///
+/// `pull` and `deb` hold one entry per scope: an operation can carry
+/// several entries with different `series` lists; every matching entry
+/// applies, in file order.
 #[derive(Debug, Clone, Deserialize, Serialize)]
 pub struct PackageQuirks {
     /// Quirks to apply during pull operation
     #[serde(default)]
-    pub pull: Option<OperationQuirks>,
+    pub pull: Vec<OperationQuirks>,
 
     /// Quirks to apply during deb operation
     #[serde(default)]
-    pub deb: Option<OperationQuirks>,
+    pub deb: Vec<OperationQuirks>,
 }
 
 /// Top-level quirks configuration
@@ -63,63 +98,233 @@ pub fn get_package_quirks<'a>(
     config.quirks.get(package)
 }
 
-/// Get deb-time extra dependencies for a package
+/// Whether a quirks entry applies to `series`: an empty series filter
+/// matches every series, otherwise the series must be listed.
+fn entry_applies_to_series(quirks: &OperationQuirks, series: &str) -> bool {
+    quirks.series.is_empty() || quirks.series.iter().any(|s| s == series)
+}
+
+/// Get the build-dependency resolution rules of a package for a series
 ///
-/// This function returns the list of extra dependencies that should be installed
-/// before building a package, as defined in the quirks configuration.
+/// Every deb entry whose series list matches contributes its rules; the
+/// returned rules apply in file order.
 ///
 /// # Arguments
 /// * `package` - The package name
+/// * `series` - The distribution series (e.g. "resolute")
 ///
 /// # Returns
-/// * `Vec<String>` - List of extra dependencies, or empty vector if none
-pub fn get_deb_extra_dependencies(package: &str) -> Vec<String> {
-    if let Some(quirks) = get_package_quirks(&QUIRKS_DATA, package)
-        && let Some(deb_quirks) = &quirks.deb
-    {
-        return deb_quirks.extra_dependencies.clone();
-    }
-
-    Vec::new()
+/// * `Vec<DependencyQuirks>` - The matching rules, empty when the package
+///   has no deb entry or none applies to the series
+pub fn get_deb_dependency_quirks(package: &str, series: &str) -> Vec<DependencyQuirks> {
+    let Some(quirks) = get_package_quirks(&QUIRKS_DATA, package) else {
+        return Vec::new();
+    };
+    quirks
+        .deb
+        .iter()
+        .filter(|deb| entry_applies_to_series(deb, series))
+        .filter_map(|deb| deb.dependencies.clone())
+        .collect()
 }
 
 /// Get package directories from quirks configuration
 ///
 /// This function returns the list of custom package directories to try
-/// when looking for the package source directory.
+/// when looking for the package source directory: every matching deb
+/// entry contributes its directories, falling back to the pull entries
+/// when no deb entry carries any.
 ///
 /// # Arguments
 /// * `package` - The package name
+/// * `series` - The distribution series (e.g. "resolute")
 ///
 /// # Returns
 /// * `Vec<String>` - List of package directories to try, or empty vector if none
-pub fn get_package_directories(package: &str) -> Vec<String> {
-    if let Some(quirks) = get_package_quirks(&QUIRKS_DATA, package) {
-        // Check deb quirks first, then pull quirks
-        if let Some(deb_quirks) = &quirks.deb
-            && !deb_quirks.package_directory.is_empty()
+pub fn get_package_directories(package: &str, series: &str) -> Vec<String> {
+    let Some(quirks) = get_package_quirks(&QUIRKS_DATA, package) else {
+        return Vec::new();
+    };
+
+    let mut directories = Vec::new();
+    for deb in quirks
+        .deb
+        .iter()
+        .filter(|q| entry_applies_to_series(q, series))
     {
-            return deb_quirks.package_directory.clone();
+        directories.extend(deb.package_directory.iter().cloned());
     }
-        if let Some(pull_quirks) = &quirks.pull
-            && !pull_quirks.package_directory.is_empty()
+    if directories.is_empty() {
+        for pull in quirks
+            .pull
+            .iter()
+            .filter(|q| entry_applies_to_series(q, series))
         {
-            return pull_quirks.package_directory.clone();
+            directories.extend(pull.package_directory.iter().cloned());
+        }
+    }
+    directories
+}
+
+/// Apply the dependency quirks of `package` in `series` to parsed
+/// build-dependency clauses
+///
+/// Rules apply in order — drop, replace, inject. `replace` matches by
+/// declared name wherever the dependency appears; rule names that match
+/// nothing are warned about, so stale quirks surface once the upstream
+/// packaging is fixed.
+pub fn apply_dependency_quirks(
+    package: &str,
+    series: &str,
+    clauses: &mut Vec<Vec<PkgRelation>>,
+    opts: &ParseOpts,
+) -> Result<(), String> {
+    for deps in get_deb_dependency_quirks(package, series) {
+        apply_rules(clauses, &deps, opts)?;
+    }
+    Ok(())
+}
+
+/// Apply one set of dependency rules to parsed clauses.
+fn apply_rules(
+    clauses: &mut Vec<Vec<PkgRelation>>,
+    deps: &DependencyQuirks,
+    opts: &ParseOpts,
+) -> Result<(), String> {
+    for name in &deps.drop {
+        let hits = clauses
+            .iter()
+            .flatten()
+            .filter(|rel| &rel.package == name)
+            .count();
+        if hits == 0 {
+            log::warn!("dependency quirk: 'drop {name}' matched nothing");
+        }
+    }
+    if !deps.drop.is_empty() {
+        for clause in clauses.iter_mut() {
+            clause.retain(|rel| !deps.drop.iter().any(|name| name == &rel.package));
+        }
+        clauses.retain(|clause| !clause.is_empty());
+    }
+
+    for (declared, replacement) in &deps.replace {
+        let mut hits = 0;
+        for clause in clauses.iter_mut() {
+            for rel in clause.iter_mut() {
+                if rel.package == *declared {
+                    *rel = crate::debian::deps::parse_simple(replacement, true)
+                        .map_err(|e| format!("invalid replacement '{replacement}': {e}"))?;
+                    hits += 1;
+                }
+            }
+        }
+        if hits == 0 {
+            log::warn!("dependency quirk: 'replace {declared}' matched nothing");
         }
     }
 
-    Vec::new()
+    for injected in &deps.inject {
+        let parsed = Deps::parse(injected, opts)?;
+        clauses.extend(parsed.clauses().map(<[PkgRelation]>::to_vec));
+    }
+
+    Ok(())
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
+    fn parse(s: &str) -> PkgRelation {
+        crate::debian::deps::parse_simple(s, true).unwrap()
+    }
+
+    fn opts() -> ParseOpts {
+        ParseOpts {
+            host_arch: "riscv64".into(),
+            build_arch: "amd64".into(),
+            build_profiles: vec!["cross".into()],
+            reduce_restrictions: true,
+            union: false,
+            build_dep: true,
+        }
+    }
+
     #[test]
     fn test_unknown_package_has_no_quirks() {
-        // A package absent from quirks.yml (currently every package) has no
-        // extra dependencies nor custom directories, and must not panic
-        assert!(get_deb_extra_dependencies("not-in-quirks").is_empty());
-        assert!(get_package_directories("not-in-quirks").is_empty());
+        // A package absent from quirks.yml has no dependency rules nor
+        // custom directories, and must not panic
+        assert!(get_deb_dependency_quirks("not-in-quirks", "resolute").is_empty());
+        assert!(get_package_directories("not-in-quirks", "resolute").is_empty());
+    }
+
+    /// The linux dependency quirks are scoped to the series they were
+    /// verified against.
+    #[test]
+    fn linux_dependency_quirks_are_series_scoped() {
+        for package in ["linux", "linux-riscv"] {
+            let rules = get_deb_dependency_quirks(package, "resolute");
+            assert_eq!(rules.len(), 1, "the resolute entry applies");
+            assert_eq!(
+                rules[0].replace.get("llvm-21-dev").map(String::as_str),
+                Some("llvm-21-dev:native <!stage1>")
+            );
+            assert!(get_deb_dependency_quirks(package, "noble").is_empty());
+        }
+    }
+
+    /// `replace` rewrites exactly the dependencies whose declared name
+    /// matches, wholesale: the replacement carries its own qualifier and
+    /// restrictions.
+    #[test]
+    fn replace_rewrites_matching_names_only() {
+        let mut clauses = vec![vec![
+            parse("llvm-21-dev <!stage1>"),
+            parse("clang-21:native"),
+        ]];
+        let deps = DependencyQuirks {
+            replace: HashMap::from([(
+                "llvm-21-dev".to_string(),
+                "llvm-21-dev:native <!stage1>".to_string(),
+            )]),
+            ..Default::default()
+        };
+        apply_rules(&mut clauses, &deps, &opts()).unwrap();
+        let rewritten = &clauses[0][0];
+        assert_eq!(rewritten.arch_qualifier.as_deref(), Some("native"));
+        assert_eq!(rewritten.restrictions.len(), 1);
+        assert_eq!(clauses[0][1].arch_qualifier.as_deref(), Some("native"));
+    }
+
+    /// `drop` removes named dependencies (empty clauses disappear) and
+    /// `inject` appends dependencies resolved like declared ones.
+    #[test]
+    fn drop_and_inject() {
+        let mut clauses = vec![vec![parse("broken-dep"), parse("keep-me")]];
+        let deps = DependencyQuirks {
+            inject: vec!["injected-dep:any".to_string()],
+            drop: vec!["broken-dep".to_string()],
+            ..Default::default()
+        };
+        apply_rules(&mut clauses, &deps, &opts()).unwrap();
+        let names: Vec<&str> = clauses
+            .iter()
+            .flatten()
+            .map(|rel| rel.package.as_str())
+            .collect();
+        assert_eq!(names, ["keep-me", "injected-dep"]);
+    }
+
+    /// A replacement that does not parse is a quirk configuration error,
+    /// not a silent no-op.
+    #[test]
+    fn invalid_replacement_is_an_error() {
+        let mut clauses = vec![vec![parse("llvm-21-dev")]];
+        let deps = DependencyQuirks {
+            replace: HashMap::from([("llvm-21-dev".to_string(), "not@@valid".to_string())]),
+            ..Default::default()
+        };
+        assert!(apply_rules(&mut clauses, &deps, &opts()).is_err());
     }
 }

src/test_support.rs

@@ -445,6 +445,10 @@ mod imp {
             self.inner.exists(path)
         }
 
+        fn is_dir(&self, path: &Path) -> io::Result<bool> {
+            self.inner.is_dir(path)
+        }
+
         fn cleanup(&self) -> io::Result<()> {
             self.inner.cleanup()
         }

src/ui/deb.rs

@@ -11,14 +11,14 @@
 use std::collections::VecDeque;
 use std::fs::{self, File};
 use std::io::Write;
-use std::path::{Path, PathBuf};
+use std::path::PathBuf;
 use std::sync::atomic::{AtomicBool, Ordering};
 use std::sync::{Arc, Mutex};
 use std::time::{Duration, Instant};
 
-use crossterm::{cursor, execute, style::Stylize, terminal::Clear, terminal::ClearType};
+use crossterm::style::Stylize;
 use directories::ProjectDirs;
-use indicatif::{MultiProgress, ProgressBar, ProgressStyle};
+use indicatif::{MultiProgress, ProgressBar, ProgressDrawTarget, ProgressStyle};
 use unicode_width::{UnicodeWidthChar, UnicodeWidthStr};
 
 use crate::context::{LineSink, Stream};
@@ -50,8 +50,11 @@ struct Pipeline {
 
 /// State shared between [`DebUi`] and its sinks
 struct Shared {
+    multi: MultiProgress,
     top: ProgressBar,
-    pane: ProgressBar,
+    /// The rolling pane bar, created on demand: flows without subprocess
+    /// output (e.g. `pkh put`) never show it at all
+    pane: Mutex<Option<ProgressBar>>,
     state: Mutex<Pipeline>,
     tee: Mutex<Option<File>>,
     log_path: Mutex<PathBuf>,
@@ -81,38 +84,33 @@ impl DebUi {
         let enabled = is_stdout_tty();
 
         let top = if enabled {
+            // The tty renders a ^C keypress as the two visible characters
+            // "^C"; on a terminal where the cursor sits near the right edge
+            // that wraps to the next row, and the erase at teardown —
+            // anchored to where indicatif last drew — ends up one row off,
+            // leaving the first widget line on screen. Rendering control
+            // characters raw instead (ECHOCTL off) makes the echo an
+            // invisible byte that moves nothing; ECHO itself stays on, so
+            // terminals showing a padlock while input is hidden are not
+            // triggered. Restored by `suspend_shared`.
+            suppress_control_char_echo();
+            multi.set_draw_target(ProgressDrawTarget::stderr());
             let pb = multi.add(ProgressBar::new(0));
             pb.enable_steady_tick(Duration::from_millis(80));
             pb.set_style(spinner_style());
             pb.set_prefix("Building package");
-            pb.set_message("(starting…)");
-            pb
-        } else {
-            ProgressBar::hidden()
-        };
-
-        let pane = if enabled {
-            let pb = multi.add(ProgressBar::new(0));
-            pb.enable_steady_tick(Duration::from_millis(150));
-            // No template margin: multi-line messages are only prefixed by
-            // the template on their first line, which would misalign the
-            // pane; each rendered line carries its own indent instead.
-            pb.set_style(
-                ProgressStyle::default_bar()
-                    .template("{msg}")
-                    .expect("valid template"),
-            );
-            pb.set_message("  │ (starting…)");
             pb
         } else {
             ProgressBar::hidden()
         };
+        let pane = Mutex::new(None);
 
         let timestamp = chrono::Utc::now().format("%Y%m%dT%H%M%S").to_string();
         let log_path = default_log_path(&timestamp);
 
         let ui = Self {
             shared: Arc::new(Shared {
+                multi: multi.clone(),
                 top,
                 pane,
                 state: Mutex::new(Pipeline {
@@ -123,7 +121,7 @@ impl DebUi {
                     bar_total: 0,
                 }),
                 tee: Mutex::new(None),
-                log_path: Mutex::new(log_path.clone()),
+                log_path: Mutex::new(log_path),
                 timestamp,
                 enabled,
                 suspended: AtomicBool::new(false),
@@ -131,8 +129,13 @@ impl DebUi {
             }),
         };
 
+        // Ctrl+C: the signal wiring lives in the CLI; this view only
+        // registers with `crate::interrupt` how to clear itself and where
+        // the full log lives. The log path is read from the shared state at
+        // interrupt time, so the rename in `open_log` stays visible to the
+        // reporter.
         if ui.shared.enabled {
-            install_sigint_hook(&log_path);
+            set_interrupt_reporter(ui.shared.clone());
         }
 
         ui
@@ -141,7 +144,7 @@ impl DebUi {
     /// Identify the binary package being built; names the log file and the
     /// status bar
     pub fn set_target(&self, package: &str, version: &str, series: &str, arch: &str) {
-        if self.shared.enabled {
+        if self.active() {
             self.shared.top.set_prefix(format!(
                 "Building {package} ({version}) for {series}/{arch}"
             ));
@@ -162,7 +165,6 @@ impl DebUi {
         };
         let _ = fs::rename(&old_path, &log_path);
         *self.shared.log_path.lock().unwrap() = log_path.clone();
-        update_sigint_log_path(&log_path);
 
         if let Some(dir) = log_path.parent() {
             let _ = fs::create_dir_all(dir);
@@ -195,10 +197,10 @@ impl DebUi {
             st.bar_total = 0;
             st.last_draw = Instant::now();
         }
-        if self.shared.enabled {
+        if self.active() {
             self.shared.top.set_style(spinner_style());
             self.shared.top.set_message(label.to_string());
-            self.shared.pane.set_message("");
+            drop_pane(&self.shared);
         }
     }
 
@@ -210,20 +212,8 @@ impl DebUi {
     /// Release the widget from the terminal (e.g. before printing
     /// passthrough diagnostics or letting child cleanup commands write to
     /// the terminal); idempotent
-    ///
-    /// Steady ticks are disabled first: otherwise a tick can redraw a frame
-    /// right after the clear, leaving stale copies of the widget on screen.
     fn suspend(&self) {
-        if !self.shared.enabled {
-            return;
-        }
-        if self.shared.suspended.swap(true, Ordering::SeqCst) {
-            return;
-        }
-        self.shared.top.disable_steady_tick();
-        self.shared.pane.disable_steady_tick();
-        self.shared.top.finish_and_clear();
-        self.shared.pane.finish_and_clear();
+        suspend_shared(&self.shared);
     }
 
     /// Success outcome body: clear the widget and print the artifacts,
@@ -240,9 +230,17 @@ impl DebUi {
 
     /// Failure outcome body: clear the widget and print a summary (recent
     /// captured errors and the path to the full log)
+    ///
+    /// On a Ctrl+C the interrupt watchdog owns the reporting — its captured
+    /// errors are just the killed children's death throes, and the watchdog
+    /// already points at the full log — so this prints nothing.
     fn failure_summary(&self) {
         self.suspend();
 
+        if crate::interrupt::interrupted() {
+            return;
+        }
+
         let st = self.shared.state.lock().unwrap();
         if self.shared.enabled && !st.errors.is_empty() {
             eprintln!("Last captured errors:");
@@ -270,7 +268,7 @@ impl DebUi {
 /// widget.
 impl crate::report::BuildView for DebUi {
     fn target(&self, target: BuildTarget<'_>) {
-        if self.shared.enabled {
+        if self.active() {
             self.shared.top.set_prefix(target.display.clone());
         }
         if target.tee_log {
@@ -408,7 +406,44 @@ fn push_line(shared: &Shared, st: &mut Pipeline, kind: Kind, text: String) {
     let now = Instant::now();
     if now.duration_since(st.last_draw) >= REDRAW_INTERVAL {
         st.last_draw = now;
-        shared.pane.set_message(render_pane(&st.lines));
+        if let Some(pane) = ensure_pane(shared) {
+            pane.set_message(render_pane(&st.lines));
+        }
+    }
+}
+
+/// The pane bar, added to the terminal on the first call and reused after
+///
+/// Returns `None` once the widget is suspended: a line racing the suspend
+/// must not re-add a bar the cleanup just cleared.
+fn ensure_pane(shared: &Shared) -> Option<ProgressBar> {
+    let mut pane = shared.pane.lock().unwrap();
+    if let Some(pb) = pane.as_ref() {
+        return Some(pb.clone());
+    }
+    if shared.suspended.load(Ordering::SeqCst) {
+        return None;
+    }
+    let pb = shared.multi.add(ProgressBar::new(0));
+    pb.enable_steady_tick(Duration::from_millis(150));
+    // No template margin: multi-line messages are only prefixed by the
+    // template on their first line, which would misalign the pane; each
+    // rendered line carries its own indent instead.
+    pb.set_style(
+        ProgressStyle::default_bar()
+            .template("{msg}")
+            .expect("valid template"),
+    );
+    *pane = Some(pb.clone());
+    Some(pb)
+}
+
+/// Take the pane bar off the terminal; the next pushed line re-creates it
+fn drop_pane(shared: &Shared) {
+    if let Some(pb) = shared.pane.lock().unwrap().take() {
+        pb.disable_steady_tick();
+        pb.finish_and_clear();
+        shared.multi.remove(&pb);
     }
 }
 
@@ -506,61 +541,90 @@ fn default_log_path(timestamp: &str) -> PathBuf {
     dir.join(format!("pkh-{timestamp}.log"))
 }
 
-static SIGINT_LOG_PATH: Mutex<Option<PathBuf>> = Mutex::new(None);
-static SIGINT_INSTALLED: AtomicBool = AtomicBool::new(false);
+/// Register the interrupt reporter: release the widget from the terminal
+/// and return the log-file hint to print below the notice
+///
+/// The CLI watchdog runs this as the first step of the interrupt shutdown,
+/// so the widget disappears the moment Ctrl+C is hit. Registered only for
+/// enabled views: in `--verbose` mode or with piped output there is no
+/// widget and nothing to report.
+fn set_interrupt_reporter(shared: Arc<Shared>) {
+    crate::interrupt::set_reporter(Box::new(move || interrupt_report(&shared)));
+}
 
-/// Install a best-effort Ctrl+C handler clearing the widget and pointing at
-/// the log file before exiting
-fn install_sigint_hook(log_path: &Path) {
-    update_sigint_log_path(log_path);
-    if SIGINT_INSTALLED.swap(true, Ordering::SeqCst) {
+/// [`suspend_shared`] plus the log-file hint, in teardown order
+///
+/// Testable end to end: the reporter closure is private to the interrupt
+/// watchdog, but the drawing behavior is not.
+fn interrupt_report(shared: &Shared) -> Option<String> {
+    suspend_shared(shared);
+    let log_path = shared.log_path.lock().unwrap().clone();
+    if log_path.exists() {
+        Some(format!("Full log: {}", log_path.display()))
+    } else {
+        None
+    }
+}
+
+/// [`DebUi::suspend`] body, shared with the interrupt reporter
+///
+/// Steady ticks are disabled first: otherwise a tick can redraw a frame
+/// right after the clear, leaving stale copies of the widget on screen.
+/// The tty echo suppressed at view start is restored here, before the
+/// erases: an echo from a keypress landing mid-teardown could not shift the
+/// cursor anymore. The draw target is finally killed: the interrupted flow
+/// keeps emitting log records while the cleanup hooks run, and every one of
+/// them would otherwise make the log bridge repaint the cleared bars from
+/// their cached frames.
+fn suspend_shared(shared: &Shared) {
+    if !shared.enabled {
         return;
     }
+    if shared.suspended.swap(true, Ordering::SeqCst) {
+        return;
+    }
+    restore_tty_echo();
+    shared.top.disable_steady_tick();
+    drop_pane(shared);
+    shared.top.finish_and_clear();
+    shared.multi.set_draw_target(ProgressDrawTarget::hidden());
+}
 
-    // SAFETY: installing a signal handler; the handler itself is best-effort
-    // (it performs non async-signal-safe operations, acceptable here because
-    // it immediately exits afterwards).
+/// Termios snapshot taken when the echo is suppressed; `Some` only while the
+/// live view is on screen
+static SAVED_TTY_TERMIOS: Mutex<Option<libc::termios>> = Mutex::new(None);
+
+/// Stop the tty from rendering control-character input (^C would show as a
+/// visible two-character "^C") while the live view is up: rendered echoes
+/// move the cursor without indicatif knowing, and the teardown erase ends
+/// up aimed past the widget
+///
+/// ECHO itself stays on — turning it off would trigger terminals'
+/// hidden-input padlock — so the only visible difference is that a ^C
+/// keypress echoes as a raw, cursor-invisible control byte. No-op without a
+/// tty on stdin.
+fn suppress_control_char_echo() {
+    // SAFETY: tcgetattr on stdin with a valid, zero-initialized buffer
+    let mut termios: libc::termios = unsafe { std::mem::zeroed() };
+    // SAFETY: reading the current attributes of stdin
+    if unsafe { libc::tcgetattr(libc::STDIN_FILENO, &mut termios) } != 0 {
+        return;
+    }
+    *SAVED_TTY_TERMIOS.lock().unwrap() = Some(termios);
+    termios.c_lflag &= !libc::ECHOCTL;
+    // SAFETY: applying the modified attributes to stdin
     unsafe {
-        libc::signal(libc::SIGINT, on_sigint as *const () as usize);
+        libc::tcsetattr(libc::STDIN_FILENO, libc::TCSANOW, &termios);
     }
 }
 
-/// Point the sigint handler at the current log file location
-fn update_sigint_log_path(log_path: &Path) {
-    *SIGINT_LOG_PATH.lock().unwrap() = Some(log_path.to_path_buf());
-}
-
-extern "C" fn on_sigint(_sig: libc::c_int) {
-    // Best-effort cleanup: clear leftover widget lines and show the cursor
-    let _ = execute!(
-        std::io::stdout(),
-        Clear(ClearType::FromCursorDown),
-        cursor::Show
-    );
-    if let Ok(guard) = SIGINT_LOG_PATH.try_lock()
-        && let Some(path) = guard.as_ref()
-    {
-        eprintln!("\nInterrupted — full log: {}", path.display());
-    }
-    // Run the registered cleanup hooks (currently: unmount and remove the
-    // ephemeral build chroot, see `deb::ephemeral::sigint_cleanup_chroot`),
-    // then exit with the conventional 130 status.
-    //
-    // Like the terminal restoration above, this is NOT strictly
-    // async-signal-safe: it locks a mutex, spawns subprocesses and does I/O.
-    // That is a deliberate tradeoff, no worse than the rest of this handler:
-    // exiting immediately would skip all destructors and leak the chroot
-    // together with its bind-mounted /proc and overlay mounts. The hooks are
-    // self-contained (they only touch stored paths and spawn umount/rm
-    // directly), so they cannot deadlock on a lock the interrupted thread
-    // might have held; the hook registry itself is only ever taken with
-    // try_lock plus a bounded retry for the same reason. Note that SIGINT
-    // stays blocked for the duration of the handler, so a second Ctrl-C will
-    // not interrupt a slow cleanup — send SIGTERM/SIGKILL if it ever hangs.
-    crate::deb::ephemeral::run_cleanup_hooks();
-    // SAFETY: raw exit bypassing destructors, intended in a signal handler
+/// Restore the tty attributes saved by [`suppress_tty_echo`]
+fn restore_tty_echo() {
+    if let Some(termios) = SAVED_TTY_TERMIOS.lock().unwrap().take() {
+        // SAFETY: re-applying the snapshot taken at view start
         unsafe {
-        libc::_exit(130);
+            libc::tcsetattr(libc::STDIN_FILENO, libc::TCSANOW, &termios);
+        }
     }
 }
 
@@ -638,6 +702,79 @@ mod tests {
         assert!(rendered.contains("a line that would overflow a narrow pane"));
     }
 
+    /// A fresh view has no pane at all: flows without subprocess output
+    /// (`pkh put`) must not render anything until a line arrives, and a
+    /// dropped or suspended pane stays gone
+    #[test]
+    fn pane_is_created_lazily_and_dropped_cleanly() {
+        let multi = MultiProgress::new();
+        let shared = Shared {
+            multi: multi.clone(),
+            top: multi.add(ProgressBar::new(0)),
+            pane: Mutex::new(None),
+            state: Mutex::new(Pipeline {
+                classifier: Box::new(GenericClassifier::new()),
+                lines: VecDeque::new(),
+                errors: Vec::new(),
+                last_draw: Instant::now(),
+                bar_total: 0,
+            }),
+            tee: Mutex::new(None),
+            log_path: Mutex::new(std::env::temp_dir().join("pkh-pane-test.log")),
+            timestamp: String::new(),
+            enabled: true,
+            suspended: AtomicBool::new(false),
+            started: Instant::now(),
+        };
+
+        assert!(shared.pane.lock().unwrap().is_none());
+
+        ensure_pane(&shared).unwrap();
+        assert!(shared.pane.lock().unwrap().is_some());
+        // Later lines hit the stored bar instead of stacking another one
+        ensure_pane(&shared).unwrap();
+        assert!(shared.pane.lock().unwrap().is_some());
+
+        drop_pane(&shared);
+        assert!(shared.pane.lock().unwrap().is_none());
+
+        // A line racing the suspend must not re-add the cleared bar
+        shared.suspended.store(true, Ordering::SeqCst);
+        assert!(ensure_pane(&shared).is_none());
+    }
+
+    /// The interrupt report kills the shared draw target: during the cleanup
+    /// hooks the interrupted flow keeps emitting log records, and every one
+    /// of them would otherwise make the log bridge repaint the bars from
+    /// their cached frames — resurrecting the widget that was just cleared.
+    #[test]
+    fn interrupt_report_disables_further_redraws() {
+        let multi = MultiProgress::new();
+        let shared = Shared {
+            multi: multi.clone(),
+            top: multi.add(ProgressBar::new(0)),
+            pane: Mutex::new(None),
+            state: Mutex::new(Pipeline {
+                classifier: Box::new(GenericClassifier::new()),
+                lines: VecDeque::new(),
+                errors: Vec::new(),
+                last_draw: Instant::now(),
+                bar_total: 0,
+            }),
+            tee: Mutex::new(None),
+            log_path: Mutex::new(std::env::temp_dir().join("pkh-interrupt-report-test.log")),
+            timestamp: String::new(),
+            enabled: true,
+            suspended: AtomicBool::new(false),
+            started: Instant::now(),
+        };
+
+        interrupt_report(&shared);
+
+        assert!(shared.suspended.load(Ordering::SeqCst));
+        assert!(shared.multi.is_hidden());
+    }
+
     /// Best-effort ANSI escape stripper, enough for the assertions above
     fn strip_ansi(line: &str) -> String {
         let mut out = String::new();