From: Jo-Philipp Wich <jo@mein.io>
Date: Thu, 8 Nov 2018 10:52:33 +0000 (+0100)
Subject: script: ipkg-build: honour $SOURCE_DATE_EPOCH
X-Git-Tag: v18.06.2~303
X-Git-Url: http://git.openwrt.org/?p=openwrt%2Fopenwrt.git;a=commitdiff_plain;h=55d078b249427380fe9cc3684f7657ccc2b1405c;ds=sidebyside

script: ipkg-build: honour $SOURCE_DATE_EPOCH

When the SOURCE_DATE_EPOCH environment variable is set, use it to
override the timestamps of .ipk archive contents.

This ensures that .ipk archives built in environments without SCM
metadata (mainly the SDK) are reproducible between different runs.

Ref: https://github.com/openwrt/packages/issues/6954
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(cherry picked from commit d157a76c67bcb821d3ec8dcd4312390ef129a95a)
---

diff --git a/scripts/ipkg-build b/scripts/ipkg-build
index 845a6ed04e..d38ba20af3 100755
--- a/scripts/ipkg-build
+++ b/scripts/ipkg-build
@@ -15,8 +15,12 @@ FIND="${FIND:-$(which gfind)}"
 TAR="${TAR:-$(which tar)}"
 GZIP="$(which gzip)"
 
+# try to use fixed source epoch
+if [ -n "$SOURCE_DATE_EPOCH" ]; then
+	TIMESTAMP=$(date --date="@$SOURCE_DATE_EPOCH")
+
 # look up date of last commit
-if [ -d "$TOPDIR/.git" ]; then
+elif [ -d "$TOPDIR/.git" ]; then
 	GIT="$(which git)"
 	TIMESTAMP=$(cd $TOPDIR; $GIT log -1 -s --format=%ci)
 elif [ -d "$TOPDIR/.svn" ]; then