private function getOptions(Project $project, $permission)
 {
     $user_groups = $this->user_group_factory->getAllForProject($project);
     $options = array();
     $selected_values = $this->permissions_manager->getAuthorizedUGroupIdsForProject($project, $this->repository->getId(), $permission);
     foreach ($user_groups as $ugroup) {
         if ($ugroup->getId() == ProjectUGroup::ANONYMOUS && $permission !== Git::PERM_READ) {
             continue;
         }
         $selected = in_array($ugroup->getId(), $selected_values) ? 'selected="selected"' : '';
         $options[] = array('value' => $ugroup->getId(), 'label' => $ugroup->getName(), 'selected' => $selected);
     }
     return $options;
 }