abuild: add last commit hash to .PKGINFO

This can be useful for package browser.

abuild.in

@@ -447,6 +447,18 @@ prepare_language_packs() {
 	done
 }
 
+# echo '-dirty' if git is not clean
+git_dirty() {
+	if [ $(git status -s "$startdir" | wc -l) -ne 0 ]; then
+		echo "-dirty"
+	fi
+}
+
+# echo last commit hash id
+git_last_commit() {
+	git log --format=oneline -n 1 "$startdir" | awk '{print $1}'
+}
+
 prepare_metafiles() {
 	getpkgver || return 1
 	local name=${subpkgname:-$pkgname}
@@ -480,6 +492,7 @@ builddate = $builddate
 packager = ${PACKAGER:-"Unknown"}
 size = $size
 arch = $parch
+commit = $(git_last_commit)$(git_dirty)
 EOF
 	local i deps
 	deps="$depends"