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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** No longer affects: oslo.config

** Changed in: nova
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1837199

Title:
  nova-manage  Tracebeck on missing arg

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  # nova-manage cell_v2
  An error has occurred:
  Traceback (most recent call last):
    File "/usr/local/lib/python3.7/site-packages/oslo_config/cfg.py", line 3179, in __getattr__
      return getattr(self._conf._namespace, name)
  AttributeError: '_Namespace' object has no attribute 'action_fn'

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/opt/stack/nova/nova/cmd/manage.py", line 2205, in main
      fn, fn_args, fn_kwargs = cmd_common.get_action_fn()
    File "/opt/stack/nova/nova/cmd/common.py", line 169, in get_action_fn
      fn = CONF.category.action_fn
    File "/usr/local/lib/python3.7/site-packages/oslo_config/cfg.py", line 3181, in __getattr__
      raise NoSuchOptError(name)
  oslo_config.cfg.NoSuchOptError: no such option action_fn in group [DEFAULT]

  # nova-manage cell_v2 help
  usage: nova-manage cell_v2 [-h]
                             {create_cell,delete_cell,delete_host,discover_hosts,list_cells,list_hosts,map_cell0,map_cell_and_hosts,map_instances,simple_cell_setup,update_cell,verify_instance}
                             ...
  nova-manage cell_v2: error: argument action: invalid choice: 'help' (choose from 'create_cell', 'delete_cell', 'delete_host', 'discover_hosts', 'list_cells', 'list_hosts', 'map_cell0', 'map_cell_and_hosts', 'map_instances', 'simple_cell_setup', 'update_cell', 'verify_instance')

  # nova-manage cell_v2 -h
  usage: nova-manage cell_v2 [-h]
                             {create_cell,delete_cell,delete_host,discover_hosts,list_cells,list_hosts,map_cell0,map_cell_and_hosts,map_instances,simple_cell_setup,update_cell,verify_instance}
                             ...

  positional arguments:
    {create_cell,delete_cell,delete_host,discover_hosts,list_cells,list_hosts,map_cell0,map_cell_and_hosts,map_instances,simple_cell_setup,update_cell,verify_instance}

  optional arguments:
    -h, --help            show this help message and exit

  python version:
  /usr/bin/python3 --version
  Python 3.7.3

  nova version:
  $ git log -1
  commit 78f9961d293e3b3e0ac62345b78abb1c9e2bd128 (HEAD -> master, origin/master, origin/HEAD)

  oslo.config              6.11.0

  Instead of printing Traceback, nova-manage should give a hint for the
  user choices.

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