[FIX] ARTEFACT condemned two correct packages

Run against stage 2's output for the first time, the check reported:

  python      17 x s390x-linux-gnu/
  filesystem  11 x usr/local/

Both are correct. CPython names two paths after the build triplet on every
platform -- the Arch x86_64 package ships
_sysconfigdata__linux_x86_64-linux-gnu.py and config-3.14-x86_64-linux-gnu/ --
so the triplet there is CPython's convention, not Debian's layout leaking in. And
creating /usr/local's skeleton is what the filesystem package exists for; the FHS
requires those directories.

Exempted by (package, pattern) pair rather than by package, so python is still
checked for lib64 and dist-packages and filesystem for multiarch. A blanket
exemption is how a real leak gets waved through -- and this check has now
condemned correct code three times: the tcl8.6 grep in sqlite's hook, the
intolerant-rm guard in systemd's, and this.

With the exemptions, stage 2's 209 packages pass: no multiarch, no lib64, no
dist-packages, no usr/local.

--- FR ---

Passé pour la première fois sur la production de l'étage 2, le test signalait :

  python      17 x s390x-linux-gnu/
  filesystem  11 x usr/local/

Les deux sont justes. CPython nomme deux chemins d'après le triplet de
construction sur toute plateforme — le paquet Arch x86_64 livre
_sysconfigdata__linux_x86_64-linux-gnu.py et config-3.14-x86_64-linux-gnu/ — le
triplet y est donc une convention de CPython, non la disposition de Debian qui
s'infiltre. Et créer le squelette de /usr/local est la raison d'être du paquet
filesystem ; le FHS l'exige.

Exemptés par couple (paquet, motif) et non par paquet : python reste contrôlé pour
lib64 et dist-packages, filesystem pour le multiarch. Une exemption globale est la
façon dont une vraie fuite passe — et ce test a désormais condamné du code juste
trois fois : le grep tcl8.6 du hook sqlite, le garde rm de celui de systemd, et
ceci.

Avec les exemptions, les 209 paquets de l'étage 2 passent : ni multiarch, ni
lib64, ni dist-packages, ni usr/local.

Assisted-by: Claude Opus 5

scripts/test-chroot.sh

@@ -110,11 +110,37 @@ note "2. ARTEFACT -- wrong library directories, which raise no error"
 # as its default libdir, which changed where pkgconf installed, which changed
 # pkgconf's compiled-in search path, which broke every pkg-config lookup in the
 # chroot. One stray .a file at the bottom of that.
+# TWO EXEMPTIONS, each named with its reason, because this check condemned
+# correct packages on its first run against stage 2's output:
+#
+#   python      17 x s390x-linux-gnu/    usr/lib/python3.14/config-3.14-s390x-linux-gnu/
+#                                        usr/lib/python3.14/_sysconfigdata__linux_s390x-linux-gnu.py
+#   filesystem  11 x usr/local/          usr/local/{bin,etc,games,include,...}
+#
+# CPython names those two after the build triplet on EVERY platform -- the Arch
+# x86_64 package ships _sysconfigdata__linux_x86_64-linux-gnu.py -- so the
+# triplet there is CPython's convention, not Debian's layout leaking in. And
+# creating /usr/local's skeleton is what the filesystem package is for; the FHS
+# requires it.
+#
+# Exempted by (package, pattern) pair rather than by package, so python is still
+# checked for lib64 and dist-packages, and filesystem for multiarch. A blanket
+# exemption is how a real leak gets waved through.
+_exempt() {  # _exempt <pkgfile> <pattern>
+    case "$(basename "$1")|$2" in
+        python-3*'|s390x-linux-gnu/')  return 0 ;;
+        filesystem-*'|^usr/local/')    return 0 ;;
+    esac
+    return 1
+}
+
 n=0
 for f in "$REPO"/*.pkg.tar.*; do
     _l=$(bsdtar -tf "$f" 2>/dev/null)
-    c=$(grep -c 's390x-linux-gnu/' <<< "$_l")
-    [ "$c" -gt 0 ] && { bad "$(basename "$f"): $c multiarch paths"; n=$((n + 1)); }
+    if ! _exempt "$f" 's390x-linux-gnu/'; then
+        c=$(grep -c 's390x-linux-gnu/' <<< "$_l")
+        [ "$c" -gt 0 ] && { bad "$(basename "$f"): $c multiarch paths"; n=$((n + 1)); }
+    fi
     c=$(grep -c '^usr/lib64/' <<< "$_l")
     [ "$c" -gt 0 ] && { bad "$(basename "$f"): $c paths under usr/lib64"; n=$((n + 1)); }
     # dist-packages: Debian's name for site-packages.
@@ -134,8 +160,10 @@ for f in "$REPO"/*.pkg.tar.*; do
     [ "$c" -gt 0 ] && { bad "$(basename "$f"): $c paths under dist-packages"; n=$((n + 1)); }
     # usr/local: python's posix_local scheme, and anything else that took the
     # host's idea of where a local install goes.
-    c=$(grep -c '^usr/local/' <<< "$_l")
-    [ "$c" -gt 0 ] && { bad "$(basename "$f"): $c paths under usr/local"; n=$((n + 1)); }
+    if ! _exempt "$f" '^usr/local/'; then
+        c=$(grep -c '^usr/local/' <<< "$_l")
+        [ "$c" -gt 0 ] && { bad "$(basename "$f"): $c paths under usr/local"; n=$((n + 1)); }
+    fi
 done
 [ "$n" -eq 0 ] && good "no multiarch, no lib64, no dist-packages, no usr/local"