77 lines
3.7 KiB
Bash
77 lines
3.7 KiB
Bash
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#!/usr/bin/env bash
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# lvm2: only device-mapper is wanted, and the lvm2 half costs a Rust toolchain.
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#
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# The chain that puts this PKGBUILD in stage 1 is
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# systemd -> cryptsetup -> device-mapper, and device-mapper is one of the two
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# packages this source produces. Nothing in the repository asks for `lvm2`
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# itself -- checked across every .PKGINFO, the only consumer of device-mapper
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# is cryptsetup, and the only consumer of lvm2 is lvm2's own dependency on
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# device-mapper.
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#
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# What the lvm2 half brings with it:
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#
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# thin-provisioning-tools -- rewritten in Rust. Its prepare() stops on
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# `error: Error loading target specification: Could not find
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# specification for target "host-tuple"`, and behind that stands cargo,
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# a crates.io fetch and the whole Rust bootstrap question. This port
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# already declined that detour once, for python-cryptography.
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#
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# libaio -- and not usefully. Ubuntu renamed its library libaio.so.1t64 for
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# the time64 ABI transition, so the lvm2 binaries link a soname Arch has
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# never had. Building Arch's libaio would not change what stage 1 links.
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#
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# Both leave the closure with the sub-package, which is why this is one hook
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# rather than three.
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#
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# THE MEASUREMENT IS THE ARGUMENT, and it is the same one that went the other
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# way for tcl and unixodbc an hour earlier. Those cost zero new packages, so
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# building them beat dropping a sub-package. This one costs a language
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# runtime, so dropping wins. The rule is not "prefer dropping" or "prefer
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# building" -- it is to measure each time.
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#
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# Deferred: a target that wants LVM builds Rust first, restores the sub-package
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# and rebuilds. device-mapper alone is what dm-crypt and systemd need.
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set -euo pipefail
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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 = "pkgname=('lvm2' 'device-mapper')"
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assert s.count(old) == 1, "lvm2: pkgname line not in the expected form"
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s = s.replace(old, "pkgname=('device-mapper')", 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 "^pkgname=('device-mapper')$" PKGBUILD || {
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echo "lvm2: sub-package not reduced to device-mapper" >&2; exit 1; }
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# package_lvm2() stays in the file, uncalled -- makepkg never calls a function
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# whose name is absent from pkgname, as with package_libquadmath() in gcc.
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grep -q "^package_device-mapper()" PKGBUILD || {
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echo "lvm2: device-mapper package function missing" >&2; exit 1; }
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echo "lvm2: only device-mapper built (lvm2 would pull Rust via thin-provisioning-tools)"
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# device-mapper also picked up the host's libselinux, silently.
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#
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# $ readelf -d usr/bin/dmsetup | grep NEEDED
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# (NEEDED) Shared library: [libselinux.so.1]
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#
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# Seventh package in this port to do it, and the second found by the soname
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# audit rather than by a build. lvm2's configure has --disable-selinux and
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# defaults to detecting; Ubuntu's libselinux1-dev is present because
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# libmount-dev and libglib2.0-dev pull it in, so it detected.
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#
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# Arch has no libselinux package at all -- the reason coreutils, findutils,
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# sed, tar and gettext each carry the same three lines. This is the sixth
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# copy, and TODO.md already records that the per-package hook does not scale
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# to a probe every package can trip.
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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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assert "--disable-selinux" not in s, "lvm2: selinux already disabled, hook ran twice"
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anchor = " --enable-cmdlib \\\n"
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assert s.count(anchor) == 1, "lvm2: configure block not in the expected form"
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s = s.replace(anchor, " --disable-selinux \\\n" + anchor, 1)
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io.open("PKGBUILD", "w", encoding="utf-8").write(s)
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PY
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[ "$(grep -c -- '--disable-selinux' PKGBUILD)" = 1 ] || {
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echo "lvm2: --disable-selinux not inserted exactly once" >&2; exit 1; }
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echo "lvm2: --disable-selinux (Arch has no libselinux; the host does)"
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