devtools/makerepropkg.in

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#!/bin/bash
# makerepropkg - rebuild a package to see if it is reproducible
#
# Copyright (c) 2019 by Eli Schwartz <eschwartz@archlinux.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
m4_include(lib/common.sh)
m4_include(lib/archroot.sh)
source /usr/share/makepkg/util/config.sh
source /usr/share/makepkg/util/message.sh
declare -A buildinfo
declare -a buildenv buildopts installed installpkgs
archiveurl='https://archive.archlinux.org/packages'
buildroot=/var/lib/archbuild/reproducible
chroot=testenv
diffoscope=0
parse_buildinfo() {
local line var val
while read -r line; do
var="${line%% = *}"
val="${line#* = }"
case ${var} in
buildenv)
buildenv+=("${val}")
;;
options)
buildopts+=("${val}")
;;
installed)
installed+=("${val}")
;;
*)
buildinfo["${var}"]="${val}"
;;
esac
done
}
get_pkgfile() {
local cdir=${cache_dirs[0]}
local pkgfilebase=${1}
local mode=${2}
local pkgname=${pkgfilebase%-*-*-*}
local pkgfile ext
# try without downloading
if [[ ${mode} != localonly ]] && get_pkgfile "${pkgfilebase}" localonly; then
return 0
fi
for ext in .zst .xz ''; do
pkgfile=${pkgfilebase}.pkg.tar${ext}
for c in "${cache_dirs[@]}"; do
if [[ -f ${c}/${pkgfile} ]]; then
cdir=${c}
break
fi
done
for f in "${pkgfile}" "${pkgfile}.sig"; do
if [[ ! -f "${cdir}/${f}" ]]; then
if [[ ${mode} = localonly ]]; then
continue 2
fi
msg2 "retrieving '%s'..." "${f}" >&2
curl -Llf -# -o "${cdir}/${f}" "${archiveurl}/${pkgname:0:1}/${pkgname}/${f}" || continue 2
fi
done
printf '%s\n' "file://${cdir}/${pkgfile}"
return 0
done
return 1
}
usage() {
cat << __EOF__
usage: ${BASH_SOURCE[0]##*/} [options] <package_file>
Run this script in a PKGBUILD dir to build a package inside a
clean chroot while attempting to reproduce it. The package file
will be used to derive metadata needed for reproducing the
package, including the .PKGINFO as well as the buildinfo.
For more details see https://reproducible-builds.org/
OPTIONS
-d Run diffoscope if the package is unreproducible
-c <dir> Set pacman cache
-M <file> Location of a makepkg config file
-h Show this usage message
__EOF__
}
while getopts 'dM:c:h' arg; do
case "$arg" in
d) diffoscope=1 ;;
M) archroot_args+=(-M "$OPTARG") ;;
c) cache_dirs+=("$OPTARG") ;;
h) usage; exit 0 ;;
*|?) usage; exit 1 ;;
esac
done
shift $((OPTIND - 1))
check_root
[[ -f PKGBUILD ]] || { error "No PKGBUILD in current directory."; exit 1; }
# without arguments, get list of packages from PKGBUILD
if [[ -z $1 ]]; then
mapfile -t pkgnames < <(source PKGBUILD; pacman -Sddp --print-format '%r/%n' "${pkgname[@]}")
wait $! || {
error "No package file specified and failed to retrieve package names from './PKGBUILD'."
plain "Try '${BASH_SOURCE[0]##*/} -h' for more information." >&2
exit 1
}
msg "Reproducing all pkgnames listed in ./PKGBUILD"
set -- "${pkgnames[@]}"
fi
# check each package to see if it's a file, and if not, try to download it
# using pacman -Sw, and get the filename from there
splitpkgs=()
for p in "$@"; do
if [[ -f ${p} ]]; then
splitpkgs+=("${p}")
else
pkgfile_remote=$(pacman -Sddp "${p}" 2>/dev/null) || { error "package name '%s' not in repos" "${p}"; exit 1; }
pkgfile=${pkgfile_remote#file://}
if [[ ! -f ${pkgfile} ]]; then
msg "Downloading package '%s' into pacman's cache" "${pkgfile}"
sudo pacman -Swdd --noconfirm --logfile /dev/null "${p}" || exit 1
pkgfile_remote=$(pacman -Sddp "${p}" 2>/dev/null)
pkgfile="${pkgfile_remote#file://}"
fi
splitpkgs+=("${pkgfile}")
fi
done
for f in "${splitpkgs[@]}"; do
if ! bsdtar -tqf "${f}" .BUILDINFO >/dev/null 2>&1; then
error "file is not a valid pacman package: '%s'" "${f}"
exit 1
fi
done
if (( ${#cache_dirs[@]} == 0 )); then
mapfile -t cache_dirs < <(pacman-conf CacheDir)
fi
ORIG_HOME=${HOME}
IFS=: read -r _ _ _ _ _ HOME _ < <(getent passwd "${SUDO_USER:-$USER}")
load_makepkg_config
HOME=${ORIG_HOME}
[[ -d ${SRCDEST} ]] || SRCDEST=${PWD}
parse_buildinfo < <(bsdtar -xOqf "${splitpkgs[0]}" .BUILDINFO)
export SOURCE_DATE_EPOCH="${buildinfo[builddate]}"
PACKAGER="${buildinfo[packager]}"
BUILDDIR="${buildinfo[builddir]}"
PKGEXT=${splitpkgs[0]#${splitpkgs[0]%.pkg.tar*}}
# nuke and restore reproducible testenv
for copy in "${buildroot}"/*/; do
[[ -d ${copy} ]] || continue
subvolume_delete_recursive "${copy}"
done
rm -rf --one-file-system "${buildroot}"
(umask 0022; mkdir -p "${buildroot}")
for fname in "${installed[@]}"; do
if ! allpkgfiles+=("$(get_pkgfile "${fname}")"); then
error "failed to retrieve ${fname}"
exit 1
fi
done
printf '%s\n' "${allpkgfiles[@]}" | mkarchroot -M @pkgdatadir@/makepkg-x86_64.conf -U "${archroot_args[@]}" "${buildroot}"/root - || exit 1
# use makechrootpkg to prep the build directory
makechrootpkg -r "${buildroot}" -l "${chroot}" -- --packagelist || exit 1
# set detected makepkg.conf options
{
for var in PACKAGER BUILDDIR PKGEXT; do
printf '%s=%s\n' "${var}" "${!var@Q}"
done
printf 'OPTIONS=(%s)\n' "${buildopts[*]@Q}"
printf 'BUILDENV=(%s)\n' "${buildenv[*]@Q}"
} >> "${buildroot}/${chroot}"/etc/makepkg.conf >> "${buildroot}/${chroot}"/etc/makepkg.conf
install -d -o "${SUDO_UID:-$UID}" -g "$(id -g "${SUDO_UID:-$UID}")" "${buildroot}/${chroot}/${BUILDDIR}"
# kick off the build
arch-nspawn "${buildroot}/${chroot}" \
--bind="${PWD}:/startdir" \
--bind="${SRCDEST}:/srcdest" \
/chrootbuild -C --noconfirm --log --holdver --skipinteg
ret=$?
if (( ${ret} == 0 )); then
msg2 "built succeeded! built packages can be found in ${buildroot}/${chroot}/pkgdest"
msg "comparing artifacts..."
for pkgfile in "${splitpkgs[@]}"; do
comparefiles=("${pkgfile}" "${buildroot}/${chroot}/pkgdest/${pkgfile##*/}")
if cmp -s "${comparefiles[@]}"; then
msg2 "Package '%s' successfully reproduced!" "${pkgfile}"
else
ret=1
warning "Package '%s' is not reproducible. :(" "${pkgfile}"
sha256sum "${comparefiles[@]}"
if (( diffoscope )); then
diffoscope "${comparefiles[@]}"
fi
fi
done
fi
# return failure from chrootbuild, or the reproducibility status
exit ${ret}