[Bug 1830770] [NEW] UCA python-nova requires UCA python-oslo.middleware but doesn't specify in dependency

[Paul Goins]

Public bug reported:

This occurred specifically on python-nova 2:15.1.5-0ubuntu1~cloud3,
pulled from http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-
updates/ocata/main amd64 Packages.

Upon attempting to deploy some nova compute nodes, we ended up with
several nodes which would not start up properly.  /var/log/syslog had a
traceback which seems to point at python-nova:

May 27 16:49:50 <HOSTNAME> systemd[1]: Starting OpenStack Compute...
May 27 16:49:50 <HOSTNAME> systemd[1]: Started OpenStack Compute.
May 27 16:49:51 <HOSTNAME> nova-compute[20093]: Traceback (most recent call last):
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/bin/nova-compute", line 10, in <module>
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     sys.exit(main())
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/lib/python2.7/dist-packages/nova/cmd/compute.py", line 42, in main
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     config.parse_args(sys.argv)
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/lib/python2.7/dist-packages/nova/config.py", line 47, in parse_args
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     config.set_middleware_defaults()
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/lib/python2.7/dist-packages/nova/common/config.py", line 20, in set_middleware_defaults
May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     cors.set_defaults(
May 27 16:49:51 <HOSTNAME> nova-compute[20093]: AttributeError: 'module' object has no attribute 'set_defaults'
May 27 16:49:51 <HOSTNAME> systemd[1]: nova-compute.service: Main process exited, code=exited, status=1/FAILURE
May 27 16:49:51 <HOSTNAME> systemd[1]: nova-compute.service: Unit entered failed state.
May 27 16:49:51 <HOSTNAME> systemd[1]: nova-compute.service: Failed with result 'exit-code'.

Upon deeper investigation, it appears that the system is running python-
oslo.middleware version 3.8.0-2ubuntu1, rather than the UCA version
3.23.1-0ubuntu1.1~cloud0.  As such, it's missing the set_defaults()
function which is available in the UCA version.

The reason we ended up in this state: ubuntu-cloud-keyring was installed
after python-nova, thus originally python-nova and python-
oslo.middleware were both pulled from the distro.  However, a package
installed after the cloud keychain was available required an upgrade of
python-nova.  However, since the UCA python-nova simply requires
"python-oslo.middleware (>= 3.0.0)", no update to python-oslo.middleware
was pulled.

** Affects: cloud-archive
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1830770

Title:
  UCA python-nova requires UCA python-oslo.middleware but doesn't
  specify in dependency

Status in Ubuntu Cloud Archive:
  New

Bug description:
  This occurred specifically on python-nova 2:15.1.5-0ubuntu1~cloud3,
  pulled from http://ubuntu-cloud.archive.canonical.com/ubuntu xenial-
  updates/ocata/main amd64 Packages.

  Upon attempting to deploy some nova compute nodes, we ended up with
  several nodes which would not start up properly.  /var/log/syslog had
  a traceback which seems to point at python-nova:

  May 27 16:49:50 <HOSTNAME> systemd[1]: Starting OpenStack Compute...
  May 27 16:49:50 <HOSTNAME> systemd[1]: Started OpenStack Compute.
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]: Traceback (most recent call last):
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/bin/nova-compute", line 10, in <module>
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     sys.exit(main())
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/lib/python2.7/dist-packages/nova/cmd/compute.py", line 42, in main
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     config.parse_args(sys.argv)
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/lib/python2.7/dist-packages/nova/config.py", line 47, in parse_args
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     config.set_middleware_defaults()
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:   File "/usr/lib/python2.7/dist-packages/nova/common/config.py", line 20, in set_middleware_defaults
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]:     cors.set_defaults(
  May 27 16:49:51 <HOSTNAME> nova-compute[20093]: AttributeError: 'module' object has no attribute 'set_defaults'
  May 27 16:49:51 <HOSTNAME> systemd[1]: nova-compute.service: Main process exited, code=exited, status=1/FAILURE
  May 27 16:49:51 <HOSTNAME> systemd[1]: nova-compute.service: Unit entered failed state.
  May 27 16:49:51 <HOSTNAME> systemd[1]: nova-compute.service: Failed with result 'exit-code'.

  Upon deeper investigation, it appears that the system is running
  python-oslo.middleware version 3.8.0-2ubuntu1, rather than the UCA
  version 3.23.1-0ubuntu1.1~cloud0.  As such, it's missing the
  set_defaults() function which is available in the UCA version.

  The reason we ended up in this state: ubuntu-cloud-keyring was
  installed after python-nova, thus originally python-nova and python-
  oslo.middleware were both pulled from the distro.  However, a package
  installed after the cloud keychain was available required an upgrade
  of python-nova.  However, since the UCA python-nova simply requires
  "python-oslo.middleware (>= 3.0.0)", no update to python-
  oslo.middleware was pulled.

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