--- /dev/null
+#!/bin/sh
+# TopGit - A different patch queue manager
+# (c) Petr Baudis <pasky@suse.cz> 2008
+# (c) Per Cederqvist <ceder@lysator.liu.se> 2010
+# GPLv2
+
+name="$(git symbolic-ref HEAD | sed 's#^refs/\(heads\|top-bases\)/##')"
+base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" || exit 1
+echo $base_rev