proper commit hash setting

1 files changed, 23 insertions, 1 deletions

diff --git a/hash.sh b/hash.sh
index e936313..0c97722 100644..100755
--- a/hash.sh
+++ b/hash.sh
@@ -1,3 +1,25 @@
 #!/bin/sh
 # script to determine git hash of current source tree
-FROM_ARCHIVE=$Format:%H$ # set when running git --archive <hash/tag>
\ No newline at end of file
+
+# set a variable when running `git --archive <hash/tag>` (this is what github does)
+# alternatively, you could also git get-tar-commit-id < tarball (but that's a bit dirtier)
+FROM_ARCHIVE=$Format:%H$
+
+# ... but try to use whatever git tells us if there is a .git folder
+if [ -d .git -a -r .git ]
+then
+	hash=$(git log 2>/dev/null | head -n1 2>/dev/null | sed "s/.* //" 2>/dev/null)
+fi
+
+if [ x"$hash" != x ]
+then
+	echo $hash
+elif [ "$FROM_ARCHIVE" != ':%H$' ]
+then
+	echo $FROM_ARCHIVE
+else
+	echo "commit hash detection fail.  Dear packager, please figure out what goes wrong or get in touch with us" >&2
+	echo UNKNOWN
+	exit 2
+fi
+exit 0