protected function getDrupalUuid()
    {
        $uuid = null;
        $version = $this->getProjectVersion();

        if ($version >= 8) {
            $result = $this->runDrushCommand('cget system.site uuid', true);

            if ($result->getExitCode() === ResultData::EXITCODE_OK) {
                $message = $result->getMessage();

                if ($colon_pos = strrpos($message, ':')) {
                    $uuid = trim(substr($message, $colon_pos + 1));
                }
            }
        }

        return $uuid;
    }