chlog: number regular uploads after the target series' vendor

A flagless entry (no --backport/--nmu/--rebuild) targeting an Ubuntu
series was numbered the Debian way: 1.0-1 became 1.0-2 with distribution
noble, and getting the conventional 1.0-1ubuntu1 required hand-editing
the version. The bump now derives from the vendor of the target series
(distro-info): Ubuntu series get the ubuntu suffix convention (1.0-1
becomes 1.0-1ubuntu1, and re-bumping an already-Ubuntu changelog
increments the counter instead of the revision), Debian series keep the
plain revision bump, and series that cannot be resolved to a vendor
(UNRELEASED, unknown) fall back to it too. There is no reverse sync, so
the Ubuntu-to-Debian direction needs no special casing.

Runs with an explicit --series now consult distro-info once, where they
previously queried it not at all; the interactive flow already did for
the series selector. EntryKind::Ubuntu remains the library-level way to
force the numbering regardless of the series.

src/changelog.rs

@@ -27,8 +27,12 @@ pub struct GeneratedEntry {
 /// explicit version is given.
 #[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
 pub enum EntryKind {
-    /// A regular upload: the Debian revision is bumped (or the trailing
-    /// upstream number for native packages)
+    /// A regular upload: the version numbering follows the vendor of the
+    /// target series — the Debian convention (`1.0-1` becomes `1.0-2`) for
+    /// Debian series, the Ubuntu one for Ubuntu series (`1.0-1` becomes
+    /// `1.0-1ubuntu1`, an already-Ubuntu `1.0-1ubuntu1` becomes
+    /// `1.0-1ubuntu2`). Unresolvable series (UNRELEASED, unknown) number
+    /// the Debian way.
     #[default]
     Normal,
     /// A non-maintainer upload: `1.0-1` becomes `1.0-1.1` (native `1.0`
@@ -36,8 +40,9 @@ pub enum EntryKind {
     Nmu,
     /// A no-change rebuild: `1.0-1` becomes `1.0-1build1`
     Rebuild,
-    /// An Ubuntu upload: `1.0-1` becomes `1.0-1ubuntu1`. Library-only for
-    /// now: the pkh CLI has no flag selecting it.
+    /// An Ubuntu upload regardless of the target series: `1.0-1` becomes
+    /// `1.0-1ubuntu1`. Library-only: the CLI has no flag selecting it,
+    /// and targeting an Ubuntu series already picks this numbering.
     Ubuntu,
     /// A backport: `1.0-1` becomes `1.0-1~bpo12+1`, where 12 is the Debian
     /// release number of the target series (derived from it: the series
@@ -84,7 +89,10 @@ pub async fn generate_entry(
         version.to_string()
     } else {
         match kind {
-            EntryKind::Normal => compute_new_version(&old_version, Bump::Normal)?,
+            EntryKind::Normal => {
+                let bump = normal_bump_for_series(&series).await;
+                compute_new_version(&old_version, bump)?
+            }
             EntryKind::Nmu => compute_new_version(&old_version, Bump::Nmu)?,
             EntryKind::Rebuild => compute_new_version(&old_version, Bump::Rebuild)?,
             EntryKind::Ubuntu => compute_new_version(&old_version, Bump::Ubuntu)?,
@@ -160,6 +168,18 @@ fn compute_new_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 —
+/// Debian series, but also UNRELEASED and series no distro-info data knows —
+/// numbers the Debian way (`1.0-1` becomes `1.0-2`).
+async fn normal_bump_for_series(series: &str) -> Bump {
+    match crate::distro_info::get_dist_from_series(series).await {
+        Ok(dist) if dist == "ubuntu" => Bump::Ubuntu,
+        _ => Bump::Normal,
+    }
+}
+
 /// The Debian release number (e.g. `"12"` for bookworm) that backport
 /// versions are numbered after (`~bpo12+1`), derived from the target series;
 /// a backport suite name (`bookworm-backports`) is accepted too. Errors when
@@ -828,6 +848,51 @@ mod tests {
         assert!(content.starts_with("mypackage (1.0-1) unstable"));
     }
 
+    /// A regular upload is numbered after the vendor of its target series:
+    /// a Debian-style version uploaded to an Ubuntu series gains the
+    /// ubuntu1 suffix, and re-bumping the now-Ubuntu changelog increments
+    /// that counter instead of the revision. 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() {
+        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 (1.0-1) unstable; 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");
+        assert_eq!(entry.series, "noble");
+
+        // Re-bumping the now-Ubuntu changelog increments the counter
+        let entry = generate_entry(
+            "debian/changelog",
+            Some(repo_dir),
+            None,
+            Some("noble"),
+            EntryKind::Normal,
+        )
+        .await
+        .unwrap();
+        assert_eq!(entry.new_version, "1.0-1ubuntu2");
+    }
+
     #[test]
     fn test_get_maintainer_info() {
         // Test with env vars