def _validate_customer_service(self):
        """
        Validate input parameters if customer service is on then
        create directory for tarball files with correct premissions for user and group.
        """
        direc = self.customer_service_dir
        if not direc.exists:
            mode = 0o750
            print("Creating customer_service_dir %s with mode %s" % (direc, mode))
            direc.makedirs()
            os.chmod(direc.path, mode)

        if self.mailto is None:
            raise RuntimeError("customer_service_dir requires mailto option in scheduler.yml")