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[Lee Yarwood <lyarwood@xxxxxxxxxx>]

I've attached a simple script to reproduce this behaviour outside of
placement.

I'm struggling to find where but AFAICT the oslo.config code parsing the
command line args is failing and defaulting to the default help func for
the top level command parser.

# cat /etc/redhat-release 
Fedora release 28 (Twenty Eight)
# python --version
Python 2.7.15
# pip freeze | grep oslo.config
oslo.config==6.7.0
# python reproduce.py cmd bar
<bound method Commands.bar of <__main__.Commands object at 0x7f50d187c110>>

# cat /etc/redhat-release 
CentOS Linux release 7.5.1804 (Core) 
# python --version
Python 2.7.5
# pip freeze | grep oslo.config
oslo.config==6.7.0
# python reproduce.py cmd bar
<bound method _CachedArgumentParser.print_help of _CachedArgumentParser(prog='reproduce cmd', usage=None, description=None, version=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)>


** Attachment added: "reproduce.py"
   https://bugs.launchpad.net/nova/+bug/1804420/+attachment/5215276/+files/reproduce.py

** Also affects: oslo.config
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1804420

Title:
  placement unit test
  placement.tests.unit.cmd.test_manage.TestCommandParsers.test_commands_associated
  fails on CentOS 7

Status in OpenStack Compute (nova):
  New
Status in oslo.config:
  New

Bug description:
  Test
  placement.tests.unit.cmd.test_manage.TestCommandParsers.test_commands_associated
  fails to run using tox -epy27 on CentOS 7. However, it works fine on
  Fedora 28 (with a different Python 2 version).

  I get the following:

  placement.tests.unit.cmd.test_manage.TestCommandParsers.test_commands_associated
  --------------------------------------------------------------------------------

  Captured stdout:
  ~~~~~~~~~~~~~~~~
      usage: run db [-h] {sync,version} ...
      
      optional arguments:
        -h, --help      show this help message and exit
      
      subcommands:
        database commands
      
        {sync,version}
          sync          Sync the datatabse to the current version.
          version       Report the current database version.
      

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      Traceback (most recent call last):
        File "placement/tests/unit/cmd/test_manage.py", line 55, in test_commands_associated
          mock_command.assert_called_once_with()
        File "/placement/.tox/py27/lib/python2.7/site-packages/mock/mock.py", line 947, in assert_called_once_with
          raise AssertionError(msg)
      AssertionError: Expected 'db_version' to be called once. Called 0 times.

  This started to fail since https://review.openstack.org/600161 was
  merged.

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