public function get_change_id($commit_hash)
{
$show = $this->shell->shell_exec($this->git . ' show -s --no-color ' . $commit_hash);
$matches = array();
preg_match("/.*Change-Id: ([Ia-z0-9]*)/", $show, $matches);
if (count($matches) === 0) {
throw new GitException("No Change-Id in commit message for {$commit_hash}");
}
return $matches[1];
}
