--- /dev/null
+#!/usr/bin/env bash
+export LANG=C
+[ -n "$TOPDIR" ] && cd $TOPDIR
+
+try_version() {
+ [ -f version ] || return 1
+ REV="$(cat version)"
+ [ -n "$REV" ]
+}
+
+try_svn() {
+ [ -d .svn ] || return 1
+ REV="$(svn info | awk '/^Revision:/ { print $2 }')"
+ REV="${REV:+r$REV}"
+ [ -n "$REV" ]
+}
+
+try_git() {
+ [ -d .git ] || return 1
+ REV="$(git-log | grep -m 1 git-svn-id | awk '{ gsub(/.*@/, "", $2); print $2 }')"
+ REV="${REV:+r$REV}"
+ [ -n "$REV" ]
+}
+
+try_version || try_svn || try_git || REV="unknown"
+echo "$REV"