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[Ihar Hrachyshka <1442543@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When running lbaas unit tests on a system where neutron.conf is
installed into /etc/neutron, and if the file does not have read
permissions for the user running unit tests, I get the following error:

{0}
neutron_lbaas.tests.unit.services.loadbalancer.agent.test_agent.TestLbaasService.test_main
[0.113960s] ... FAILED

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "neutron_lbaas/tests/unit/services/loadbalancer/agent/test_agent.py", line 45, in test_main
        agent.main()
      File "neutron_lbaas/services/loadbalancer/agent/agent.py", line 58, in main
        common_config.init(sys.argv[1:]){0} neutron_lbaas.tests.unit.services.loadbalancer.agent.test_agent.TestLbaasService.test_main [0.113960s] ... FAILED

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "neutron_lbaas/tests/unit/services/loadbalancer/agent/test_agent.py", line 45, in test_main
        agent.main()
      File "neutron_lbaas/services/loadbalancer/agent/agent.py", line 58, in main
        common_config.init(sys.argv[1:])
      File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/src/neutron/neutron/common/config.py", line 185, in init
        **kwargs)
      File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/lib/python2.7/site-packages/oslo_config/cfg.py", line 1856, in __call__
        self._namespace._files_permission_denied)
    oslo_config.cfg.ConfigFilesPermissionDeniedError: Failed to open some config files: /etc/neutron/neutron.conf

      File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/src/neutron/neutron/common/config.py", line 185, in init
        **kwargs)
      File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/lib/python2.7/site-packages/oslo_config/cfg.py", line 1856, in __call__
        self._namespace._files_permission_denied)
    oslo_config.cfg.ConfigFilesPermissionDeniedError: Failed to open some config files: /etc/neutron/neutron.conf

This is because oslo.config tries to autodiscover config files, and read
them, in case they exist. Unit tests should be isolated from those
files.

** Affects: neutron
     Importance: Undecided
     Assignee: Ihar Hrachyshka (ihar-hrachyshka)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1442543

Title:
  oslo_config.cfg.ConfigFilesPermissionDeniedError: Failed to open some
  config files: /etc/neutron/neutron.conf

Status in OpenStack Neutron (virtual network service):
  In Progress

Bug description:
  When running lbaas unit tests on a system where neutron.conf is
  installed into /etc/neutron, and if the file does not have read
  permissions for the user running unit tests, I get the following
  error:

  {0}
  neutron_lbaas.tests.unit.services.loadbalancer.agent.test_agent.TestLbaasService.test_main
  [0.113960s] ... FAILED

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      Traceback (most recent call last):
        File "neutron_lbaas/tests/unit/services/loadbalancer/agent/test_agent.py", line 45, in test_main
          agent.main()
        File "neutron_lbaas/services/loadbalancer/agent/agent.py", line 58, in main
          common_config.init(sys.argv[1:]){0} neutron_lbaas.tests.unit.services.loadbalancer.agent.test_agent.TestLbaasService.test_main [0.113960s] ... FAILED

  Captured traceback:
  ~~~~~~~~~~~~~~~~~~~
      Traceback (most recent call last):
        File "neutron_lbaas/tests/unit/services/loadbalancer/agent/test_agent.py", line 45, in test_main
          agent.main()
        File "neutron_lbaas/services/loadbalancer/agent/agent.py", line 58, in main
          common_config.init(sys.argv[1:])
        File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/src/neutron/neutron/common/config.py", line 185, in init
          **kwargs)
        File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/lib/python2.7/site-packages/oslo_config/cfg.py", line 1856, in __call__
          self._namespace._files_permission_denied)
      oslo_config.cfg.ConfigFilesPermissionDeniedError: Failed to open some config files: /etc/neutron/neutron.conf

        File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/src/neutron/neutron/common/config.py", line 185, in init
          **kwargs)
        File "/home/ihrachyshka/proj/openstack/neutron-lbaas/.tox/py27/lib/python2.7/site-packages/oslo_config/cfg.py", line 1856, in __call__
          self._namespace._files_permission_denied)
      oslo_config.cfg.ConfigFilesPermissionDeniedError: Failed to open some config files: /etc/neutron/neutron.conf

  This is because oslo.config tries to autodiscover config files, and
  read them, in case they exist. Unit tests should be isolated from
  those files.

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