docs: def run_update(self, template_name=None, service_dir=None):
          " Run update scripts. "
  
          LOGGER.info('Site Update start.')
          print_header('Update %s' % self.get_name())
          map(call, self._gen_scripts(
              'update', template_name=template_name, service_dir=service_dir))
          LOGGER.info('Site Update done.')
          return True