public function execute(Git_Hook_PushDetails $push_details, $commit_sha1)
{
$rev_id = $push_details->getRepository()->getFullName() . '/' . $commit_sha1;
$text = $this->git_exec->catFile($commit_sha1);
$GLOBALS['group_id'] = $push_details->getRepository()->getProject()->getId();
$this->reference_manager->extractCrossRef($text, $rev_id, Git::REFERENCE_NATURE, $push_details->getRepository()->getProject()->getId(), $push_details->getUser()->getId());
}