Support reproducible builds

Recent development versions of makepkg support reproducible builds
through the environment variable SOURCE_DATE_EPOCH. Pass this variable
through makechrootpkg to makepkg when available.

Also initialize SOURCE_DATE_EPOCH whenever running archbuild to enforce
reproducible builds for repository packages.

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/archbuild.in b/archbuild.in
index 8339aef..1e5b582 100644
--- a/archbuild.in
+++ b/archbuild.in
@@ -39,7 +39,7 @@ while getopts 'hcr:' arg; do
 	esac
 done
 
-check_root
+check_root SOURCE_DATE_EPOCH
 
 # Pass all arguments after -- right to makepkg
 makechrootpkg_args+=("${@:$OPTIND}")
@@ -74,5 +74,10 @@ else
                 pacman -Syu --noconfirm || abort
 fi
 
+# Always build official packages reproducibly
+if [[ ! -v SOURCE_DATE_EPOCH ]]; then
+	export SOURCE_DATE_EPOCH=$(date +%s)
+fi
+
 msg "Building in chroot for [%s] (%s)..." "${repo}" "${arch}"
 exec makechrootpkg -r "${chroots}/${repo}-${arch}" "${makechrootpkg_args[@]}"