[Bug 1960319] Re: Missing dependency for neutron-server: openvswitch-common

[Edward Hope-Morley]

** Patch added: "lp1960319-wallaby.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/neutron/+bug/1960319/+attachment/5643655/+files/lp1960319-wallaby.debdiff

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https://bugs.launchpad.net/bugs/1960319

Title:
  Missing dependency for neutron-server: openvswitch-common

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  New
Status in Ubuntu Cloud Archive victoria series:
  New
Status in Ubuntu Cloud Archive wallaby series:
  New
Status in Ubuntu Cloud Archive xena series:
  New
Status in Ubuntu Cloud Archive yoga series:
  Fix Released
Status in neutron package in Ubuntu:
  Fix Released
Status in neutron source package in Focal:
  New
Status in neutron source package in Jammy:
  Fix Released

Bug description:
  [Impact]
  Backporting patch that adds openvswitch-common dependency to neutron-server to prior releases of Openstack (U,V,W,X).

  [Test Plan]
  * deploy Openstack with neutron ml2-ovn
  * create a vm and add a floating ip
  * check Mac Binding table in southbound database and make note of entries
  * delete the vm and floating ip
  * corresponding entries in db should be gone

  [Regression Potential]
  This is not expected to have a regression potential.

  =========================================================================

  The Neutron Server code will in some circumstances call out to the
  `ovsdb-client` binary for OVN database maintenance. [0]

  This change appeared recently but has been backported all the way to
  OpenStack Train [1].

  The neutron-server does currently not depend on openvswitch-common and
  as such the call will fail with log entries like:

  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event [req-46b888be-d233-4aec-a4d4-3ba04d220f64 - - - - -] Unexpected exception in notify_loop: FileNotFoundError: [Errno 2] No such file or directory: 'ovsdb-client'
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event Traceback (most recent call last):
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3/dist-packages/ovsdbapp/event.py", line 143, in notify_loop
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     match.run(event, row, updates)
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/ovsdb/ovsdb_monitor.py", line 347, in run
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     self.driver.delete_mac_binding_entries(row.external_ip)
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3/dist-packages/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py", line 1068, in delete_mac_binding_entries
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     return processutils.execute(*cmd,
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3/dist-packages/oslo_concurrency/processutils.py", line 383, in execute
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     obj = subprocess.Popen(cmd,
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3/dist-packages/eventlet/green/subprocess.py", line 58, in __init__
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     subprocess_orig.Popen.__init__(self, args, 0, *argss, **kwds)
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3.8/subprocess.py", line 858, in __init__
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     self._execute_child(args, executable, preexec_fn, close_fds,
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event   File "/usr/lib/python3.8/subprocess.py", line 1704, in _execute_child
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event     raise child_exception_type(errno_num, err_msg, err_filename)
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event FileNotFoundError: [Errno 2] No such file or directory: 'ovsdb-client'
  2022-02-08 13:38:23.053 386820 ERROR ovsdbapp.event

  0: https://github.com/openstack/neutron/blob/2999b8e579dd9d5ac6ee5f0ec77ff5607b6a1143/neutron/plugins/ml2/drivers/ovn/mech_driver/mech_driver.py#L1113
  1: https://review.opendev.org/q/Id84bf17953527c415d611bfc198038fb6f811de3

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