3.4.0~beta1 maas-region-api fails to start with pylxd 2.3.2~alpha1-420-10-g.72426bf~ubuntu22.04.1

[Alexander Balderson]

When testing in the SQA lab on a Jammy host, we had one group of hosts that was running pylxd 2.3.2~alpha1-420-10-g.72426bf~ubuntu22.04.1 (the older version of python3-pylxd) but the maas-region-api failed to start during apt install because it couldnot import get_session_for_url from pylxd/client.py:

ImportError: cannot import name 'get_session_for_url' from 'pylxd.client' (/usr/lib/python3/dist-packages/pylxd/client.py)

Looking at the debian/control file for MAAS, it requires python3-pylxd >= 2.3.1. It looks like this version requirement isnt always compatible with the the requirements in MAAS.

The service does start when running on python3-pylxd 2.3.2~alpha1-431-10-g.fe37358~ubuntu22.04.1, currently in the archive.

Setting up maas-region-api (1:3.4.0~beta1-14097-g.08ee1439a-0ubuntu1~22.04.1) ...
Traceback (most recent call last):
  File "/usr/sbin/maas-region", line 33, in <module>
    sys.exit(load_entry_point('maas==3.4.0b1', 'console_scripts', 'maas-region')())
  File "/usr/lib/python3/dist-packages/maasserver/region_script.py", line 81, in run
    run_django(is_snap, is_devenv)
  File "/usr/lib/python3/dist-packages/maasserver/region_script.py", line 70, in run_django
    management.execute_from_command_line()
  File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python3/dist-packages/django/core/management/__init__.py", line 395, in execute
    django.setup()
  File "/usr/lib/python3/dist-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/usr/lib/python3/dist-packages/django/apps/registry.py", line 114, in populate
    app_config.import_models()
  File "/usr/lib/python3/dist-packages/django/apps/config.py", line 301, in import_models
    self.models_module = import_module(models_module_name)
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/lib/python3/dist-packages/maasserver/models/__init__.py", line 114, in <module>
    from maasserver.models.bmc import (
  File "/usr/lib/python3/dist-packages/maasserver/models/bmc.py", line 55, in <module>
    from maasserver.models.node import get_default_zone, Machine, Node
  File "/usr/lib/python3/dist-packages/maasserver/models/node.py", line 185, in <module>
    from provisioningserver.drivers.power.registry import (
  File "/usr/lib/python3/dist-packages/provisioningserver/drivers/power/registry.py", line 9, in <module>
    from provisioningserver.drivers.pod.registry import PodDriverRegistry
  File "/usr/lib/python3/dist-packages/provisioningserver/drivers/pod/registry.py", line 10, in <module>
    from provisioningserver.drivers.pod.lxd import LXDPodDriver
  File "/usr/lib/python3/dist-packages/provisioningserver/drivers/pod/lxd.py", line 16, in <module>
    from pylxd.client import get_session_for_url
ImportError: cannot import name 'get_session_for_url' from 'pylxd.client' (/usr/lib/python3/dist-packages/pylxd/client.py)
[0mdpkg: error processing package maas-region-api (--configure):

[Christian Grabowski (cgrabowski)]

Hmm it appears that specific commit has `get_session_for_url()` was moved into the Client class https://github.com/lxc/pylxd/blob/72426bf7c5d2b8768cfd1779523c9860cfafd266/pylxd/client.py, however it was moved back as of ba8f06f42f3575526623f3ce78361feeea9be458. Marking as triaged.