wait_until_done ()
{
  pid=$1
  cnt=${DRILLBIT_TIMEOUT:-300}
  origcnt=$cnt
  while kill -0 $pid > /dev/null 2>&1; do
    if [ $cnt -gt 1 ]; then
      cnt=`expr $cnt - 1`
      sleep 1
    else
      echo "Process did not complete after $origcnt seconds, killing."
      kill -9 $pid
      exit 1
    fi
  done
  return 0
}