code: def set_owner_params(self, uid=None, gid=None, add_gids=None, set_asap=False):
          
          prefix = 'immediate-' if set_asap else ''
  
          self._set(prefix + 'uid', uid)
          self._set(prefix + 'gid', gid)
          self._set('add-gid', add_gids, multi=True)
  
          # This may be wrong for subsequent method calls.
          self.owner = [uid, gid]
  
          return self._section
docs: Set process owner params - user, group.
  
          :param str|unicode|int uid: Set uid to the specified username or uid.
  
          :param str|unicode|int gid: Set gid to the specified groupname or gid.
  
          :param list|str|unicode|int add_gids: Add the specified group id to the process credentials.
              This options allows you to add additional group ids to the current process.
              You can specify it multiple times.
  
          :param bool set_asap: Set as soon as possible.
              Setting them on top of your vassal file will force the instance to setuid()/setgid()
              as soon as possible and without the (theoretical) possibility to override them.