[PATCH] MODULES.html.sh: handle tarball builds

[Bernhard M. Wiedemann]

Distributions typically build binaries from release tarballs
that do not contain a .git directory.
In such a setup the git log would fail.
This patch provides a fallback that still allows for reproducibility.

See https://reproducible-builds.org/specs/source-date-epoch/
for the definition of this variable.

This also replaces the git log line with a simpler equivalent.

CC: Bruno Haible <address@hidden>
---
 MODULES.html.sh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/MODULES.html.sh b/MODULES.html.sh
index b1638dada..0151670cc 100755
--- a/MODULES.html.sh
+++ b/MODULES.html.sh
@@ -3695,7 +3695,10 @@ func_echo '<LI>A POT file and some PO files'
 func_end UL
 
 func_echo '<HR>'
-git_checkout_date=`git log -n 1 --date=iso --format=fuller | sed -n -e 
's/^CommitDate: //p'`
+git_checkout_date=`PAGER= git log -n 1 --format=%ci`
+if [ -z "$git_checkout_date" ] ; then
+  git_checkout_date=@${SOURCE_DATE_EPOCH:-`date +%s`}
+fi
 pretty_date=`LC_ALL=C date +"%e %B %Y" --date="$git_checkout_date"`
 func_echo "Generated by <CODE>MODULES.html.sh</CODE> from a git checkout as of 
${pretty_date}."
 
-- 
2.16.4