protected function githubCommitRequest(Project $project, array $payload)
    {
        // Github sends a payload when you close a pull request with a
        // non-existent commit. We don't want this.
        if (array_key_exists('after', $payload) && $payload['after'] === '0000000000000000000000000000000000000000') {
            return array('status' => 'ignored');
        }

        if (isset($payload['commits']) && is_array($payload['commits'])) {
            // If we have a list of commits, then add them all as builds to be tested:

            $results = array();
            $status = 'failed';
            foreach ($payload['commits'] as $commit) {
                if (!$commit['distinct']) {
                    $results[$commit['id']] = array('status' => 'ignored');
                    continue;
                }

                try {
                    $branch = str_replace('refs/heads/', '', $payload['ref']);
                    $committer = $commit['committer']['email'];
                    $results[$commit['id']] = $this->createBuild(
                        $project,
                        $commit['id'],
                        $branch,
                        $committer,
                        $commit['message']
                    );
                    $status = 'ok';
                } catch (Exception $ex) {
                    $results[$commit['id']] = array('status' => 'failed', 'error' => $ex->getMessage());
                }
            }
            return array('status' => $status, 'commits' => $results);
        }

        if (substr($payload['ref'], 0, 10) == 'refs/tags/') {
            // If we don't, but we're dealing with a tag, add that instead:
            $branch = str_replace('refs/tags/', 'Tag: ', $payload['ref']);
            $committer = $payload['pusher']['email'];
            $message = $payload['head_commit']['message'];
            return $this->createBuild($project, $payload['after'], $branch, $committer, $message);
        }

        return array('status' => 'ignored', 'message' => 'Unusable payload.');
    }