[Bug 1948439] Update Released

[Corey Bryant]

The verification of the Stable Release Update for python-glance-store
has completed successfully and the package has now been released to
-updates. In the event that you encounter a regression using the package
from -updates please report a new bug using ubuntu-bug and tag the bug
report regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1948439

Title:
  Not able to create image with cinder as storage backend

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Fix Released
Status in python-glance-store package in Ubuntu:
  Fix Released
Status in python-glance-store source package in Focal:
  Fix Released

Bug description:
  On Ussuri, creation of image with cinder as glance storage backend
  fails.

  Reproduction Steps:

  1. Deploy cloud environment - focal ussuri
  2. Change the following configuration in /etc/glance/glance-api.conf to setup Cinder as Storage backend to Glance.

  [DEFAULT]
  enabled_backends = local:file, cinder:cinder
  [glance_store]
  default_backend = cinder

  Restart glance-api service
  systemctl restart glance-api.service

  3. Upload a cirros image to glance
  openstack image create --container-format bare --disk-format qcow2 --file /home/ubuntu/images/cirros-0.4.0-x86_64-disk.img test

  The above command throws an exception.

  Exception in /var/log/glance/glance-api.log
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder [req-282b09b7-3db4-44f7-937c-b7c2fb71453b da9d04a5652c41b98126e1a2b1ce9601 1c133b846e4e4948873aa3af847c23df - 4d430c7d67e0416a95e38b10aad4fc5f 4d430c7d67e0416a95e38b10aad4fc5f] Exception while accessing to cinder volume 7553d4cd-d315-4f97-8abe-f375864fa84a.: TypeError: temporary_chown() got an unexpected keyword argument 'backend'
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder Traceback (most recent call last):
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder   File "/usr/lib/python3/dist-packages/glance_store/_drivers/cinder.py", line 575, in _open_cinder_volume
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder     with self.temporary_chown(
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder   File "/usr/lib/python3.8/contextlib.py", line 240, in helper
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder     return _GeneratorContextManager(func, args, kwds)
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder   File "/usr/lib/python3.8/contextlib.py", line 83, in __init__
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder     self.gen = func(*args, **kwds)
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder TypeError: temporary_chown() got an unexpected keyword argument 'backend'
  2021-10-20 06:34:34.894 279293 ERROR glance_store._drivers.cinder

  Package used:
  python3-glance-store/focal-updates,now 2.0.0-0ubuntu2 all [installed,automatic]

  Analysis:

  The method signature and the calling method args seems different for function temporary_chown
  https://opendev.org/openstack/glance_store/src/tag/2.0.0/glance_store/_drivers/cinder.py#L458
  https://opendev.org/openstack/glance_store/src/tag/2.0.0/glance_store/_drivers/cinder.py#L573

  This is fixed in upstream as part of https://bugs.launchpad.net/glance-store/+bug/1870289
  The bug fix for LP#1870289 need to be SRU'ed to Ubuntu python3-glance-store packages.

  ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

  [Impact]
  Not able to upload an image to glance

  [Test Case]
  1. Deploy cloud with focal ussuri
  2. Configure cinder as glance storage backend

  Ensure the following configurations in glance-api.conf
  [DEFAULT]
  enabled_backends = local:file, cinder:cinder
  [glance_store]
  default_backend = cinder

  Restart glance-api service
  systemctl restart glance-api.service

  3. Upload an image to glance
  openstack image create --container-format bare --disk-format qcow2 --file /home/ubuntu/images/cirros-0.4.0-x86_64-disk.img test

  Image creation should be successful.

  4. Repeat step 3 with creation of 5 images concurrently.
     Run the command in step3 in 5 different consoles.

  Verify if image creation is successful for all of them.
  'openstack image list' should list all the 5 images 

  [Regression Potential]
  The fix enhanced the locking mechanism to support concurrent image creation requests in addition to correcting the function signature that caused the initial problem. The test case is enhanced to verify concurrent
  creation of images to avoid any regressions.
  Also the patch is verified upstream via CI unit test cases and functional test cases.

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