#!/bin/sh

VN=$(git describe --abbrev=8 HEAD 2>/dev/null)
case "$VN" in
v[0-9]*) : happy ;;
*)       exit 1  ;;
esac

dirty=$(sh -c 'git diff-index --name-only HEAD' 2>/dev/null) || dirty=
case "$dirty" in
'')
	;;
*)
	VN="$VN-dirty" ;;
esac

echo $VN