Gittern\Transport\NativeTransport::resolvePackedRef PHP Method

    protected function resolvePackedRef($ref)
    {
        if ($this->isFileRelative('packed-refs')) {
            $packed_refs = $this->readFileRelative('packed-refs');
            if (preg_match('/([0-9a-f]{40}) ' . preg_quote('refs/' . $ref, '/') . '/', $packed_refs, $matches)) {
                return $matches[1];
            }
        }
        return false;
    }