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authorEli Schwartz <eschwartz@archlinux.org>2017-09-12 23:59:24 -0400
committerAllan McRae <allan@archlinux.org>2017-09-13 14:21:34 +1000
commit4dae3fde17d663bf39a17978c2ee365696a54fb0 (patch)
tree0c3a5f0a1a38fd35995961e550f8111cdf3ed61b
parent39319c1860d200a9b4a3cc2c6975e3cece502f2d (diff)
makepkg: respect $SOURCE_DATE_EPOCH to activate reproducible builds
If SOURCE_DATE_EPOCH is set, `touch` all source files between the (optional) prepare() and build() functions to unify the modification times. This works around build systems and compilers that embed the file modification times into the file contents of release artifacts. Signed-off-by: Eli Schwartz <eschwartz@archlinux.org> Signed-off-by: Allan McRae <allan@archlinux.org>
-rw-r--r--doc/makepkg.8.txt16
-rw-r--r--scripts/makepkg.sh.in13
2 files changed, 28 insertions, 1 deletions
diff --git a/doc/makepkg.8.txt b/doc/makepkg.8.txt
index 2dff1b19..e1d50775 100644
--- a/doc/makepkg.8.txt
+++ b/doc/makepkg.8.txt
@@ -206,6 +206,7 @@ Options
*\--printsrcinfo*::
Generate and print the SRCINFO file to stdout.
+
Additional Features
-------------------
makepkg supports building development versions of packages without having to
@@ -214,6 +215,19 @@ separate utility 'versionpkg'. See linkman:PKGBUILD[5] for details on how to
set up a development PKGBUILD.
+Reproducibility
+---------------
+makepkg is designed to be compatible with
+link:https://reproducible-builds.org/docs/[Reproducible Builds]. If the
+**SOURCE_DATE_EPOCH** environment variable is set, it will be exported to
+subprocesses, and source and package file modification times and package
+metadata will be unified based on the timestamp specified.
+
+If the **SOURCE_DATE_EPOCH** environment variable is not set, makepkg will use
+its own start date for internal use, but will not unify source file timestamps
+before building.
+
+
Environment Variables
---------------------
**PACMAN**::
@@ -265,6 +279,8 @@ Environment Variables
Specify a key to use when signing packages, overriding the GPGKEY setting
in linkman:makepkg.conf[5]
+**SOURCE_DATE_EPOCH=**"<date>"::
+ Used for link:https://reproducible-builds.org/docs/[Reproducible Builds].
Configuration
-------------
diff --git a/scripts/makepkg.sh.in b/scripts/makepkg.sh.in
index 20e9dd7e..a466e4f1 100644
--- a/scripts/makepkg.sh.in
+++ b/scripts/makepkg.sh.in
@@ -79,6 +79,7 @@ PKGFUNC=0
PKGVERFUNC=0
PREPAREFUNC=0
REPKG=0
+REPRODUCIBLE=0
RMDEPS=0
SKIPCHECKSUMS=0
SKIPPGPCHECK=0
@@ -87,7 +88,12 @@ SPLITPKG=0
SOURCEONLY=0
VERIFYSOURCE=0
-export SOURCE_DATE_EPOCH=${SOURCE_DATE_EPOCH:-$(date +%s)}
+if [[ -n $SOURCE_DATE_EPOCH ]]; then
+ REPRODUCIBLE=1
+else
+ SOURCE_DATE_EPOCH=$(date +%s)
+fi
+export SOURCE_DATE_EPOCH
PACMAN_OPTS=()
@@ -1686,6 +1692,11 @@ if (( !REPKG )); then
if (( PREPAREFUNC )); then
run_prepare
fi
+ if (( REPRODUCIBLE )); then
+ # We have activated reproducible builds, so unify source times before
+ # building
+ find "$srcdir" -exec touch -h -d @$SOURCE_DATE_EPOCH {} +
+ fi
fi
if (( PKGVERFUNC )); then