gistfile1.php

<?php

    /**
     * get current git revision
     */
    if (sfConfig::get('sf_environment') != 'prod' && file_exists(sfConfig::get('sf_root_dir').'/../.git/logs/HEAD'))
    {
      $fp = fopen(sfConfig::get('sf_root_dir').'/../.git/logs/HEAD', 'r');
      
      $pos = -2; $line = ''; $c = '';
      do {
          $line = $c . $line;
          fseek($fp, $pos--, SEEK_END);
          $c = fgetc($fp);
      } while ($c != "\n" && $c !== false);
  
      list(, $rev) = explode(' ', $line);
      $rev = substr($rev, 0, 10);
  
      sfConfig::set('app_git_revision', $rev);
    }