#!/bin/sh

dname=`dirname $0`

if [ ! -d $dname/../.git ]; then
    echo "not updating .git_version (no $dname/../.git)"
    exit 0
fi

cur=`cd $dname && git rev-parse HEAD 2>/dev/null; git describe 2>/dev/null`
[ -e $1 ] && old=`cat $1`

if [ "$cur" != "$old" ]; then
    echo regenerating $1 with $cur
    echo "$cur" > $1
else
    echo $1 is up to date.
fi