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[Akira KAMIO <2081009@xxxxxxxxxxxxxxxxxx>]

** Also affects: glance (Ubuntu)
   Importance: Undecided
       Status: New

** No longer affects: glance (Ubuntu)

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https://bugs.launchpad.net/bugs/2081009

Title:
  oslo_config.cfg.NotInitializedError when switching default policy_file
  in oslo.policy

Status in Glance:
  Fix Released

Bug description:
  While we attempted to update the default policy file in
  https://review.opendev.org/c/openstack/oslo.policy/+/929714 , we
  observed the glance-api can't start and complains the error below.

  ```
  Traceback (most recent call last):
    File "/opt/stack/data/venv/bin/glance-wsgi-api", line 6, in <module>
      from glance.common.wsgi_app import init_app
    File "/opt/stack/glance/glance/common/wsgi_app.py", line 24, in <module>
      from glance.common import config
    File "/opt/stack/glance/glance/common/config.py", line 643, in <module>
      policy.Enforcer(CONF)
    File "/opt/stack/oslo.policy/oslo_policy/policy.py", line 543, in __init__
      self.policy_file = policy_file or pick_default_policy_file(
    File "/opt/stack/oslo.policy/oslo_policy/policy.py", line 378, in pick_default_policy_file
      if conf.find_file(conf.oslo_policy.policy_file):
    File "/opt/stack/data/venv/lib/python3.10/site-packages/oslo_config/cfg.py", line 2782, in find_file
  Traceback (most recent call last):
    File "/opt/stack/data/venv/bin/glance-wsgi-api", line 6, in <module>
      from glance.common.wsgi_app import init_app
    File "/opt/stack/glance/glance/common/wsgi_app.py", line 24, in <module>
      from glance.common import config
    File "/opt/stack/glance/glance/common/config.py", line 643, in <module>
      policy.Enforcer(CONF)
    File "/opt/stack/oslo.policy/oslo_policy/policy.py", line 543, in __init__
      self.policy_file = policy_file or pick_default_policy_file(
    File "/opt/stack/oslo.policy/oslo_policy/policy.py", line 378, in pick_default_policy_file
      raise NotInitializedError()
  oslo_config.cfg.NotInitializedError: call expression on parser has not been invoked
  ```

  The problem here is that Enforcer() is called directly at the module
  level in glance.common.config and we can't guarantee the module is
  imported after CONF instance is initialized.

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