Mathieu Benoit
2a1997e06d
pacman's resolver named 70 unresolved dependencies. Excluding python-brotli alone took that to 47 and removed `python` outright, with libffi, mpdecimal and gdbm behind it. python-libseccomp would have re-admitted the same tree, and nothing across 135 packages depends on either. Both wheels are unusable on the target anyway: built by the host's python 3.13, ABI-tagged cpython-313, while Arch ships 3.14. Stage 2 produces real ones. systemd-ukify is different -- it is architectural. ukify assembles a PE binary and its EFI_ARCH_MAP has no s390x entry, so guess_efi_arch() raises ValueError on this machine. Shipping it would put a program in the repository that cannot start. systemd-tests followed it out: a test suite behind --nocheck, and the only reason five more python packages were wanted. The dropped artefacts were still indexed in core.db afterwards. repo-add only adds, so a sub-package removed from pkgname leaves its last build installable forever. Removed by hand; TODO.md records the gap. --- FR --- Le résolveur de pacman nommait 70 dépendances non résolues. Écarter le seul python-brotli a ramené le compte à 47 et retiré `python` d'un coup, avec libffi, mpdecimal et gdbm derrière. python-libseccomp aurait réadmis le même arbre, et rien parmi 135 paquets ne dépend de l'un ou de l'autre. Les deux roues sont de toute façon inutilisables sur la cible : bâties par le python 3.13 de l'hôte, marquées cpython-313, quand Arch livre la 3.14. L'étage 2 en produira de vraies. systemd-ukify est d'une autre nature — architectural. ukify assemble un binaire PE et son EFI_ARCH_MAP n'a pas d'entrée s390x : guess_efi_arch() lève donc ValueError sur cette machine. Le livrer mettrait au dépôt un programme incapable de démarrer. systemd-tests l'a suivi : une suite de tests derrière --nocheck, et la seule raison de réclamer cinq paquets python de plus. Les artefacts écartés restaient indexés dans core.db. repo-add n'ajoute que : un sous-paquet retiré de pkgname laisse sa dernière compilation installable à jamais. Retirés à la main ; TODO.md consigne le manque. Assisted-by: Claude Opus 5
77 lines
3.8 KiB
Bash
Executable file
77 lines
3.8 KiB
Bash
Executable file
#!/usr/bin/env bash
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# brotli: a Debian default that ships silently, and a sub-package that costs
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# more than it is worth.
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#
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# The first produces no error. makepkg exits 0 and the repository gains a
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# package whose library sits where nothing on the target will look -- the case
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# "an exit code proves nothing, only the artefact proves" was written for,
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# where the symptom arrives months later, far from the cause.
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#
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# The second is a closure decision, not a defect, and it is measured rather
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# than argued.
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set -euo pipefail
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# 1. The C library, and the one that actually matters.
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#
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# brotli's PKGBUILD calls plain `cmake`, not the arch-cmake stand-in, so it
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# never sees the -DCMAKE_INSTALL_LIBDIR=lib that stand-in passes. CMake's
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# GNUInstallDirs then picks its branch by sniffing the host: no
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# /etc/arch-release, /etc/debian_version present, so
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#
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# CMAKE_INSTALL_LIBDIR = lib/s390x-linux-gnu
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#
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# Measured on a DESTDIR install of a real build: libbrotlicommon.so.1,
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# libbrotlidec.so.1, libbrotlienc.so.1 and their .pc files all under
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# /usr/lib/s390x-linux-gnu. brotli is in stage 1 only because the chroot said
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# openssl and curl need libbrotli*.so -- and the filesystem package's
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# /etc/ld.so.conf reads only ld.so.conf.d, so the target would never find
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# them. A no-op in stage 2, where CMake takes the /etc/arch-release branch.
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python3 - <<'PY'
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import io
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s = io.open("PKGBUILD", encoding="utf-8").read()
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old = ' -DCMAKE_INSTALL_PREFIX=/usr \\\n'
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assert s.count(old) == 1, "expected exactly one cmake configure, found %d" % s.count(old)
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s = s.replace(old, old + ' -DCMAKE_INSTALL_LIBDIR=lib \\\n', 1)
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io.open("PKGBUILD", "w", encoding="utf-8").write(s)
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PY
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grep -q 'DCMAKE_INSTALL_LIBDIR=lib' PKGBUILD || {
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echo "brotli: libdir not pinned" >&2; exit 1; }
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echo "brotli: cmake libdir pinned to lib (host GNUInstallDirs says multiarch)"
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# 2. python-brotli: dropped, because it costs the entire python closure.
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#
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# THE MEASUREMENT THAT DECIDED IT. pacman resolver named 70 missing
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# dependencies. Excluding this one sub-package from the ledger took that to
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# 47 and removed `python` outright -- with libffi, mpdecimal and gdbm behind
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# it. Three packages of closure, for one module.
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#
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# And the module could not work anyway. The wheel is built by the host python
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# 3.13 and is ABI-tagged cpython-313; Arch ships 3.14. No destination makes it
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# importable on the target, so stage 2 is what has to produce a real one.
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# TODO.md carries that entry already.
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#
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# Note what is NOT the reason. The wheel also lands in
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# /usr/local/lib/python3.13/dist-packages, because Debian patches sysconfig to
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# prefer its posix_local scheme, and an Arch package may not ship /usr/local.
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# That was worth a relocation while the sub-package existed; with the
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# sub-package gone there is nothing to relocate, and keeping the relocation
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# would be editing a package() function makepkg never calls.
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#
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# build() still builds the wheel -- it is one function for all three
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# sub-packages -- and the result is simply not packaged. Cheap, and it keeps
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# this hook to one line of real change.
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#
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# brotli-testdata stays: nothing depends on it, it costs no closure, and
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# removing it would be churn.
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python3 - <<'PYB'
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import io
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s = io.open("PKGBUILD", encoding="utf-8").read()
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old = "pkgname=('brotli' 'python-brotli' 'brotli-testdata')"
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assert s.count(old) == 1, "brotli: expected exactly one pkgname line"
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s = s.replace(old, "pkgname=('brotli' 'brotli-testdata')", 1)
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io.open("PKGBUILD", "w", encoding="utf-8").write(s)
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PYB
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grep -q "^pkgname=('brotli' 'brotli-testdata')$" PKGBUILD || {
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echo "brotli: python-brotli not removed from pkgname" >&2; exit 1; }
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grep -q "python-brotli" PKGBUILD && echo "brotli: python-brotli remains only in its own package function (never called)"
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echo "brotli: python-brotli dropped (pulled the whole python closure)"
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