#1072668: fix git integration.

 * @param $release The release details array from drupal.org

 */

function package_handler_download_project(&$request, $release) {

  if (isset($release['version_extra']) && $release['version_extra'] == 'dev') {

    // Use the development repository, not supported yet.

  $repository = 'git://git.drupal.org/project/' . $request['name'] . '.git';

    // Strip -dev off the end.

    $tag = substr($release['version'], 0, -4);

  }

  else {

    // Use a stable repository.

    $repository = 'git://git.drupal.org/project-stable/' . $request['name'] . '.git';

    $tag = $release['version'];

  }

  $request['repository'] = $repository;

  $tag = $release['tag'];

  // Clone the repo into its appropriate target location.

  $command = array();

  $command[] = 'git clone';

  $command[] = drush_get_option('gitcloneparams');

  $command[] = $repository;

  $command[] = $request['full_project_path'];

  if (!drush_shell_exec(implode(' ', $command))) {

  $command  = 'git clone';

  $command .= ' ' . drush_get_option('gitcloneparams');

  $command .= ' ' . drush_escapeshellarg($repository);

  $command .= ' ' . drush_escapeshellarg($request['full_project_path']);

  if (!drush_shell_exec($command)) {

    return drush_set_error('DRUSH_PM_GIT_CHECKOUT_PROBLEMS', dt('Unable to clone project !name from git.drupal.org.', array('!name' => $request['name'])));

  }

  // Check out the appropriate branch.

  $command = array();

  $command[] = 'git checkout';

  $command[] = drush_get_option('gitcheckoutparams');

  $command[] = $tag;

  if (!drush_shell_cd_and_exec($request['full_project_path'], implode(' ', $command))) {

  // Check if the 'tag' from the release feed is a tag or a branch.

  // If the tag exists, git will return it

  if (!drush_shell_cd_and_exec($request['full_project_path'], 'git tag -l ' . drush_escapeshellarg($tag))) {

    return drush_set_error('DRUSH_PM_GIT_CHECKOUT_PROBLEMS', dt('Unable to clone project !name from git.drupal.org.', array('!name' => $request['name'])));

  }

  $output = drush_shell_exec_output();

  if (isset($output[0]) && ($output[0] == $tag)) {

    // If we want a tag, simply checkout it. The checkout will end up in

    // "detached head" state.

    $command  = 'git checkout ' . drush_get_option('gitcheckoutparams');

    $command .= ' ' . drush_escapeshellarg($tag);

    if (!drush_shell_cd_and_exec($request['full_project_path'], $command)) {

      return drush_set_error('DRUSH_PM_UNABLE_CHECKOUT', 'Unable to retrieve ' . $request['name'] . ' from git.drupal.org.');

    }

  }

  else {

    // Else, we want to checkout a branch.

    // First check if we are not already in the correct branch.

    if (!drush_shell_cd_and_exec($request['full_project_path'], 'git symbolic-ref HEAD')) {

      return drush_set_error('DRUSH_PM_UNABLE_CHECKOUT', 'Unable to retrieve ' . $request['name'] . ' from git.drupal.org.');

    }

    $output = drush_shell_exec_output();

    $current_branch = preg_replace('@^refs/heads/@', '', $output[0]);

    // If we are not on the correct branch already, switch to the correct one.

    if ($current_branch != $tag) {

      $command  = 'git checkout';

      $command .= ' ' . drush_get_option('gitcheckoutparams');

      $command .= ' --track ' . drush_escapeshellarg('origin/' . $tag) . ' -b ' . drush_escapeshellarg($tag);

      if (!drush_shell_cd_and_exec($request['full_project_path'], $command)) {

        return drush_set_error('DRUSH_PM_UNABLE_CHECKOUT', 'Unable to retrieve ' . $request['name'] . ' from git.drupal.org.');

      }

    }

  }

  return TRUE;

}