Find the Drupal root quickly in bash

drupal_root.sh

#!/bin/bash

test_root () {
  if [ "$(pwd)" != "/" ]; then
    lnct=$(find . -maxdepth 2 -type f -path './includes/bootstrap.inc' | wc -l)
    if [ $lnct -gt 0 ]; then
      drupal_root=$(pwd)
      return 0
    else
      cd ..
      test_root
      return $?
    fi
  else
    return 1
  fi
}

start_dir=$(pwd)

if test_root ; then
  cd $start_dir
  echo $drupal_root
  exit 0
else
  cd $start_dir
  echo "Not currently in a Drupal site directory."
  exit 1
fi