cloud-compute-relation-changed hook errors when database is in maintenance mode

[Chris MacNaughton]

2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed Traceback (most recent call last):
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/cloud-compute-relation-changed", line 1382, in <module>
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed main()
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/cloud-compute-relation-changed", line 1374, in main
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed hooks.execute(sys.argv)
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/charmhelpers/core/hookenv.py", line 934, in execute
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed self._hooks[hook_name]()
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/cloud-compute-relation-changed", line 674, in cloud_compute_relation_changed
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed add_hosts_to_cell_when_ready()
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/cloud-compute-relation-changed", line 688, in add_hosts_to_cell_when_ready
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed ncc_utils.add_hosts_to_cell()
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/nova_cc_utils.py", line 950, in add_hosts_to_cell
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed cell1_uuid = get_cell_uuid('cell1')
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/nova_cc_utils.py", line 831, in get_cell_uuid
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed cells = get_cell_details()
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/var/lib/juju/agents/unit-nova-cloud-controller-0/charm/hooks/nova_cc_utils.py", line 849, in get_cell_details
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed out = subprocess.check_output(cmd).decode('utf-8')
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/usr/lib/python3.5/subprocess.py", line 626, in check_output
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed **kwargs).stdout
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed File "/usr/lib/python3.5/subprocess.py", line 708, in run
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed output=stdout, stderr=stderr)
2020-04-08 13:06:21 DEBUG cloud-compute-relation-changed subprocess.CalledProcessError: Command '['sudo', 'nova-manage', 'cell_v2', 'list_cells', '--verbose']' returned non-zero exit status 1
2020-04-08 13:06:22 ERROR juju.worker.uniter.operation runhook.go:132 hook "cloud-compute-relation-changed" failed: exit status 1

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/718467
Committed: https://git.openstack.org/cgit/openstack/charm-nova-cloud-controller/commit/?id=65ed6620c7594cac914d21c2203742f63dc43d17
Submitter: Zuul
Branch: master

commit 65ed6620c7594cac914d21c2203742f63dc43d17
Author: Chris MacNaughton <email address hidden>
Date: Wed Apr 8 16:09:25 2020 +0200

    We cannot talk to the database during maintenance

    Change-Id: Ie0d58c3f11b34d5fd6354c3f2130e8618e49b915
    Closes-Bug: #1871647