HAClusterRequires has no attribute add_systemd_service

[Alexander Balderson]

Our standard baremetal k8s deploys use HAcluster with kubernetes master and received the following error:

2019-11-23 15:53:12 INFO juju-log etcd:13: Invoking reactive handler: reactive/hacluster.py:42:configure_hacluster
2019-11-23 15:53:12 ERROR juju-log etcd:13: Hook error:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-kubernetes-master-1/.venv/lib/python3.6/site-packages/charms/reactive/__init__.py", line 74, in main
    bus.dispatch(restricted=restricted_mode)
  File "/var/lib/juju/agents/unit-kubernetes-master-1/.venv/lib/python3.6/site-packages/charms/reactive/bus.py", line 390, in dispatch
    _invoke(other_handlers)
  File "/var/lib/juju/agents/unit-kubernetes-master-1/.venv/lib/python3.6/site-packages/charms/reactive/bus.py", line 359, in _invoke
    handler.invoke()
  File "/var/lib/juju/agents/unit-kubernetes-master-1/.venv/lib/python3.6/site-packages/charms/reactive/bus.py", line 181, in invoke
    self._action(*args)
  File "/var/lib/juju/agents/unit-kubernetes-master-1/charm/reactive/hacluster.py", line 73, in configure_hacluster
    hacluster.add_systemd_service(name, service)
AttributeError: 'HAClusterRequires' object has no attribute 'add_systemd_service'

Crashdump is attached

[George Kraft (cynerva)]

Thanks for the report. Looks like this is happening because we messed up a stable backport for this bug: https://bugs.launchpad.net/charm-kubernetes-master/+bug/1841005

We backported the charm-kubernetes-master and layer-hacluster fixes, but did not backport the interface-hacluster fix that they depend on.

[George Kraft (cynerva)]

We just rebased stable branches in preparation for the CK 1.17 release. I've confirmed that the missing interface-hacluster fix is now in our stable branch, so we should expect this to be fixed in the CK 1.17 release.