Mathieu Benoit
dcaa55b19a
--nodeps means every makedepend must be named here by hand. Seven builds stopped on one, each naming a different tool: itstool, convert, fig2dev, asciidoctor, libnsl, python -m build, libbpf, history. The list was also a lie by omission. libreadline-dev, libncurses-dev, zlib1g-dev, python3-dev, doxygen, xsltproc, docbook-xsl, elinks and libcap2-bin were on this VM by hand and never declared. They made the builds pass here and would fail on a fresh Ubuntu, for reasons that have nothing to do with s390x. history.pc is generated rather than copied: our own readline package ships a correct one, but its libdir names /usr/lib, which on a multiarch host holds no libhistory. The .pc has to describe THIS host. Three hooks for what apt cannot buy. systemd asks for an EFI arch s390x does not have -- and says "python3 is missing modules: elftools", which sends you to apt for four lines before admitting the real reason. --- FR --- --nodeps veut dire que chaque makedepend doit être nommé ici à la main. Sept compilations se sont arrêtées sur l'une d'elles, chacune désignant un outil différent : itstool, convert, fig2dev, asciidoctor, libnsl, python -m build, libbpf, history. La liste mentait aussi par omission. libreadline-dev, libncurses-dev, zlib1g-dev, python3-dev, doxygen, xsltproc, docbook-xsl, elinks et libcap2-bin étaient posés à la main sur cette VM, jamais déclarés. Ils faisaient passer les compilations ici et auraient échoué sur un Ubuntu neuf, pour des raisons étrangères à s390x. history.pc est généré et non copié : notre propre paquet readline en livre un correct, mais son libdir nomme /usr/lib, qui sur un hôte multiarch ne contient aucun libhistory. Le .pc doit décrire CET hôte-ci. Trois crochets pour ce qu'apt n'achète pas. systemd réclame une architecture EFI que s390x n'a pas — et annonce « python3 is missing modules: elftools », ce qui envoie chez apt pour quatre lignes avant d'avouer la vraie raison. Assisted-by: Claude Opus 5
85 lines
4.1 KiB
Bash
Executable file
85 lines
4.1 KiB
Bash
Executable file
#!/usr/bin/env bash
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# brotli: two Debian defaults, and both of them ship silently.
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#
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# Neither produces an error. makepkg exits 0 both times and the repository
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# gains a package whose files are in places nothing on the target will look.
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# This is the case "an exit code proves nothing, only the artefact proves"
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# was written for -- the symptom arrives months later, far from the cause.
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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. The python wheel, and an honest account of what this buys.
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#
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# package_python-brotli() runs
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#
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# python -m installer --destdir="$pkgdir" dist/*.whl
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#
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# and `installer` asks sysconfig where a wheel belongs. Debian and Ubuntu
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# patch sysconfig to prefer the "posix_local" scheme, so the answer here is
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# /usr/local/lib/python3.13/dist-packages. Verified by running the real wheel
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# through the real installer into a scratch pkgdir.
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#
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# BE CLEAR ABOUT WHAT THIS FIXES. It does NOT make the module importable on
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# Arch. Arch ships python 3.14 and this wheel is cp313 with an ABI-tagged
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# _brotli.cpython-313-*.so, so no destination makes a stage-1 wheel work on
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# the target; stage 2 is what produces a usable one. What the move buys is
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# that an Arch package must not ship files under /usr/local, which Arch
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# reserves for the administrator. That is the whole justification, and
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# writing a bigger one here would mislead the next reader.
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#
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# `installer --prefix=/usr` does NOT help: posix_local is literally
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# "{base}/local/lib/pythonX.Y/dist-packages", so overriding base with /usr
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# still lands in /usr/local. The SCHEME would have to change, and the only
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# supported way to change it is to be a different interpreter.
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#
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# Guarded on the directory, not the host name: under an Arch python the
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# directory is absent and the block does nothing. Only purelib moves -- the
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# wheel declares py_modules=["brotli"] plus the extension, no scripts and no
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# data files, so nothing else of it ever leaves /usr/local.
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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 = ' python -m installer --destdir="$pkgdir" dist/*.whl\n'
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assert old in s, "installer invocation not found"
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new = old + """ # Ubuntu's python installs to /usr/local/lib/pythonX.Y/dist-packages
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# (sysconfig's posix_local scheme). An Arch package may not ship /usr/local.
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local _pyver=$(python -c 'import sys; print("%d.%d" % sys.version_info[:2])')
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if [ -d "$pkgdir/usr/local/lib/python$_pyver/dist-packages" ]; then
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install -dm 755 "$pkgdir/usr/lib/python$_pyver"
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mv "$pkgdir/usr/local/lib/python$_pyver/dist-packages" \\
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"$pkgdir/usr/lib/python$_pyver/site-packages"
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rm -rf "$pkgdir/usr/local"
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fi
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"""
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s = s.replace(old, new, 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 "posix_local scheme" PKGBUILD || {
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echo "brotli: wheel relocation not inserted" >&2; exit 1; }
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echo "brotli: python wheel moved out of /usr/local"
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