conf get opt failed when group is string

[Dou Rui Yuan]

CONF._get(name, group) will failed if group is string and namespace is not none:

2018-02-02 09:14:27.720 49134 ERROR glance Traceback (most recent call last):
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/bin/glance-api", line 10, in <module>
2018-02-02 09:14:27.720 49134 ERROR glance sys.exit(main())
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/glance/cmd/api.py", line 88, in main
2018-02-02 09:14:27.720 49134 ERROR glance server.start(config.load_paste_app('glance-api'), default_port=9292)
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/glance/common/wsgi.py", line 506, in start
2018-02-02 09:14:27.720 49134 ERROR glance self.configure()
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/glance/common/wsgi.py", line 582, in configure
2018-02-02 09:14:27.720 49134 ERROR glance initialize_glance_store()
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/glance/common/wsgi.py", line 428, in initialize_glance_store
2018-02-02 09:14:27.720 49134 ERROR glance glance_store.create_stores(CONF)
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/glance_store/backend.py", line 329, in create_stores
2018-02-02 09:14:27.720 49134 ERROR glance real_store_entry = conf._get('store_driver', group=store_entry)
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2928, in _get
2018-02-02 09:14:27.720 49134 ERROR glance value = self._do_get(name, group, namespace)
2018-02-02 09:14:27.720 49134 ERROR glance File "/usr/lib/python2.7/site-packages/oslo_config/cfg.py", line 2963, in _do_get
2018-02-02 09:14:27.720 49134 ERROR glance group_name = group.name if group else None
2018-02-02 09:14:27.720 49134 ERROR glance AttributeError: 'str' object has no attribute 'name'
2018-02-02 09:14:27.720 49134 ERROR glance

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/540208

[Doug Hellmann (doug-hellmann)]

The _get() method is private (indicated by the _ prefix in the name), so it shouldn't be called directly from application code.

The correct way to access the config setting is CONF.group_name.store_driver where "group_name" is whatever the value of the story_entry variable is in the traceback above.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Dou Rui Yuan (<email address hidden>) on branch: master
Review: https://review.openstack.org/540208