openstack-upgrade action not working on Bionic with --channel=4.0/stable

[Paul Goins]

I'm working on a trilio upgrade for a customer, but am having trouble using the openstack-upgrade action.

trilio-wlm's openstack-origin was cloud:bionic-train. I set action-managed-upgrade=true, then openstack-origin=cloud:bionic-ussuri. I then tried to run openstack-upgrade.

Here is what I got:

$ juju run-action --wait trilio-wlm/1 openstack-upgrade
unit-trilio-wlm-1:
  UnitId: trilio-wlm/1
  id: "7011"
  message: run_upgrade() got an unexpected keyword argument 'upgrade_openstack'
  results: {}
  status: failed
  timing:
    completed: 2022-10-20 15:59:09 +0000 UTC
    enqueued: 2022-10-20 15:59:08 +0000 UTC
    started: 2022-10-20 15:59:08 +0000 UTC

Relevant details from "juju status --format=yaml trilio-wlm":

  trilio-wlm:
    charm: trilio-wlm
    series: bionic
    os: ubuntu
    base: ubuntu:18.04
    charm-origin: charmhub
    charm-name: trilio-wlm
    charm-rev: 6
    charm-channel: 4.0/stable
    charm-version: eabf195

[Paul Goins (vultaire)]

While I can't vouch for the cleanliness of this workaround, this seems to have worked for me:

# Reset to the previous series.
# Ideally doesn't do much aside from updating sources
# since action-managed-upgrade is True.
juju config trilio-wlm openstack-origin=cloud:bionic-train

# Disable action-managed upgrades
juju config trilio-wlm action-managed-upgrade=false

# Re-try the upgrade. Note that this affects everything
# all at once rather than 1-by-1.
juju config trilio-wlm openstack-origin=cloud:bionic-ussuri

[Paul Goins (vultaire)]

The same issue appears to affect charm-trilio-dm-api.