#!/bin/sh

usage() {
   echo "usage: $0 <source root>"
   echo "  Prints the source control revision of the given source directory,"
   echo "  the exact format of the revision string depends on the source "
   echo "  control system. If the source control system isn't known, the output"
   echo "  is empty and the exit code is 1."
   exit 1
}

if [ $# != 1 ] || [ ! -d $1 ]; then
  usage;
fi

cd $1
if [ -d .svn ]; then
   svnversion
elif [ -d .git/svn ]; then
   git svn info | grep 'Revision:' | cut -d: -f2-
elif [ -d .git ]; then
   git log -1 --pretty=format:%H
else
   exit 1;
fi

exit 0