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deb: survive crashed sessions and config-blind resumes
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Two failures from resumed kernel sessions:

A resumed build re-runs debian/rules build, but the kernels keep
their wrapper-step stamps in debian/stamps and the flavour config
rule there exports .config from the annotations with no config
prerequisite: the resumed build silently kept the previous
attempt's configuration and a config edit never reached the .deb.
Dropping the stamp cache unconditionally would impose the kernel
packaging's shape on every package, so it is data-driven instead:
packages declare the caches under a resume_clear quirk, and
resumed builds remove those tree-relative paths before the build.
The inner kbuild keeps its own incremental state, so only the
cheap wrapper passes re-run and config-affected objects recompile.

A SIGKILLed build (OOM) leaves its overlay mounts and /proc bind
mount behind, and overlayfs creates root-owned work state inside
the workdir: the next plain build (recording is always on, it
replaces the session of its identity) failed to clear the
leftovers with a permission error. Session clearing now unmounts
everything under each entry at depth (re-reading /proc/mounts,
tolerating mount stacks from consecutive crashes) and escalates
through sudo; when the tree still cannot be cleared, the build
reports it and continues without a session instead of layering
over a half-cleared one.
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vhaudiquet
2026-09-28 00:05:14 +02:00
parent 6bb8ab5016
commit d927dc93ab
8 changed files with 230 additions and 42 deletions
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README.md
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@@ -134,6 +134,14 @@ A plain `pkh deb` never reuses a session — everything is rechecked from
scratch — and it replaces the session of its target. `pkh deb --resume`
refuses to adopt a session built for a different series/architecture.
Packages whose `debian/rules` keeps an input-untracked stamp cache (the
kernels' `debian/stamps`) declare it in the quirks data (`resume_clear`):
resumed builds drop the cache so the wrapper steps — including the
kernel's flavour config export — re-run over the incremental inner
builds, and a config edit is never silently ignored. If a build died
hard (OOM kill), the next build unmounts and clears the leftover session
state first (escalating through sudo when needed).
### Running the DEP-8 tests
`pkh test` runs the package's as-installed tests (`debian/tests/control`,