[Bug]: `deploy` fails attempting to infer series in a k8s charm deployed from path

[sed-i]

Description

On a k8s charm (grafana-k8s), I get the following error in an itest:

Traceback (most recent call last):
  File "/home/ubuntu/code/grafana-k8s-operator/tests/integration/test_external_url.py", line 27, in test_deploy
    await asyncio.gather(
  File "/home/ubuntu/code/grafana-k8s-operator/.tox/integration/lib/python3.10/site-packages/juju/model.py", line 1820, in deploy
    raise JujuError(
juju.errors.JujuError: Couldn't determine series for charm at /home/ubuntu/code/grafana-k8s-operator/.tox/integration/tmp/pytest/test-external-url-4opr0/charms/grafana-k8s_ubuntu-20.04-amd64.charm. Pass a 'series' kwarg to Model.deploy().

Passing force=True doesn't help.

Passing series="kubernetes" results in a hangup:

controller-0: 12:44:59.563 INFO juju.worker.caasapplicationprovisioner.runner stopped "grafana", err: getting image for base: channel "kubernetes/" not valid
controller-0: 12:44:59.563 ERROR juju.worker.caasapplicationprovisioner.runner exited "grafana": getting image for base: channel "kubernetes/" not valid

Passing series="focal" works.

Urgency

Annoying bug in our test suite

Python-libjuju version

3.0.4

Juju version

2.9.36

Reproduce / Test

https://github.com/canonical/grafana-k8s-operator/blob/catch-ingress-ready/tests/integration/test_external_url.py

[juanmanuel-tirado]

You're right. The logic to determine the series to be used in local charms have not been exposed correctly for 2.9 controllers. We will work to fix it. Thanks for reporting.