DB migration downgrades fail with oslo.config.cfg.ArgsAlreadyParsedError error

[Jay Bryant]

While testing downgrade of the database today I saw the following traceback:

-bash-4.1# python manage.py downgrade 1
23 -> 22...
Traceback (most recent call last):
  File "manage.py", line 33, in <module>
    repository=os.path.abspath(os.path.dirname(migrate_repo.__file__)))
  File "/usr/lib/python2.6/site-packages/migrate/versioning/shell.py", line 209, in main
    ret = command_func(**kwargs)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/api.py", line 202, in downgrade
    return _migrate(url, repository, version, upgrade=False, err=err, **opts)
  File "<string>", line 2, in _migrate
  File "/usr/lib/python2.6/site-packages/migrate/versioning/util/__init__.py", line 160, in with_engine
    return f(*a, **kw)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/api.py", line 366, in _migrate
    schema.runchange(ver, change, changeset.step)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/schema.py", line 93, in runchange
    change.run(self.engine, step)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/script/py.py", line 141, in run
    script_func = self._func(funcname)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/script/py.py", line 160, in _func
    if not hasattr(self.module, funcname):
  File "/usr/lib/python2.6/site-packages/migrate/versioning/script/py.py", line 156, in module
    self._module = self.verify_module(self.path)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/script/py.py", line 97, in verify_module
    module = import_path(path)
  File "/usr/lib/python2.6/site-packages/migrate/versioning/util/importpath.py", line 14, in import_path
    module = __import__(filename)
  File "/usr/lib/python2.6/site-packages/cinder/db/sqlalchemy/migrate_repo/versions/023_add_expire_reservations_index.py", line 19, in <module>
    from cinder.openstack.common import log as logging
  File "/usr/lib/python2.6/site-packages/cinder/openstack/common/log.py", line 192, in <module>
    CONF.register_cli_opts(common_cli_opts)
  File "/usr/lib/python2.6/site-packages/oslo/config/cfg.py", line 1547, in __inner
    result = f(self, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/oslo/config/cfg.py", line 1711, in register_cli_opts
    self.register_cli_opt(opt, group, clear_cache=False)
  File "/usr/lib/python2.6/site-packages/oslo/config/cfg.py", line 1551, in __inner
    return f(self, *args, **kwargs)
  File "/usr/lib/python2.6/site-packages/oslo/config/cfg.py", line 1703, in register_cli_opt
    raise ArgsAlreadyParsedError("cannot register CLI option")
oslo.config.cfg.ArgsAlreadyParsedError: arguments already parsed: cannot register CLI option

This happens in multiple migration versions and on both mysql and DB2. It looks like this might be related to this bug: https://bugs.launchpad.net/oslo.vmware/+bug/1284837

I will investigate further.

[Sean McGinnis (sean-mcginnis)]

Closing stale bug. If this is still an issue please reopen.