code: def fileserver_update(fileserver):
      '''
      Update the fileserver backends, requires that a salt.fileserver.Fileserver
      object be passed in
      '''
      try:
          if not fileserver.servers:
              log.error(
                  'No fileservers loaded, the master will not be able to '
                  'serve files to minions'
              )
              raise salt.exceptions.SaltMasterError('No fileserver backends available')
          fileserver.update()
      except Exception as exc:
          log.error(
              'Exception %s occurred in file server update', exc,
              exc_info_on_loglevel=logging.DEBUG
          f fileserver_update(fileserver):
      '''
      Update the fileserver backends, requires that a salt.fileserver.Fileserver
      object be passed in
      '''
      try:
          if not fileserver.servers:
              log.error(
                  'No fileservers loaded, the master will not be able to '
                  'serve files to minions'
              )
              raise salt.exceptions.SaltMasterError('No fileserver backends available')
          fileserver.update()
      except Exception as exc:
          log.error(
              'Exception %s occurred in file server update', exc,
              exc_info_on_loglevel=logging.DEBUG
          )
docs: Update the fileserver backends, requires that a salt.fileserver.Fileserver
      object be passed in