Support Jammy

[Eric Chen]

Jammy (22.04) is not available in charmhub now
https://charmhub.io/juju-lint

[Mert Kirpici (mertkirpici)]

When built on focal and running on jammy, following error occurs during runtime:

Traceback (most recent call last):
  File "/usr/local/bin/auto_lint.py", line 280, in <module>
    main()
  File "/usr/local/bin/auto_lint.py", line 270, in main
    juju_status = loop.run(get_juju_status(auto_lint_config))
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/jasyncio.py", line 118, in run
    raise task.exception()
  File "/usr/local/bin/auto_lint.py", line 80, in get_juju_status
    await model.connect(
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/model.py", line 736, in connect
    await self._connector.connect(**kwargs)
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connector.py", line 74, in connect
    self._connection = await Connection.connect(**kwargs)
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connection.py", line 339, in connect
    await self._connect_with_redirect([_ep])
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connection.py", line 862, in _connect_with_redirect
    login_result = await self._connect_with_login(endpoints)
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connection.py", line 826, in _connect_with_login
    await self._connect(endpoints)
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connection.py", line 776, in _connect
    result = await task
  File "/usr/lib/python3.10/asyncio/tasks.py", line 571, in _wait_for_one
    return f.result() # May raise f.exception().
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connection.py", line 765, in _try_endpoint
    return await self._open(endpoint, cacert)
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/client/connection.py", line 407, in _open
    return (await websockets.connect(
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/websockets/py35/client.py", line 12, in __await_impl__
    transport, protocol = await self._creating_connection
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1089, in create_connection
    transport, protocol = await self._create_connection_transport(
  File "/usr/lib/python3.10/asyncio/base_events.py", line 1107, in _create_connection_transport
    protocol = protocol_factory()
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/websockets/client.py", line 411, in <lambda>
    factory = lambda: create_protocol(
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/websockets/client.py", line 58, in __init__
    super().__init__(**kwds)
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/websockets/protocol.py", line 218, in __init__
    self._drain_lock = asyncio.Lock(loop=loop)
  File "/usr/lib/python3.10/asyncio/locks.py", line 78, in __init__
    super().__init__(loop=loop)
  File "/usr/lib/python3.10/asyncio/mixins.py", line 17, in __init__
    raise TypeError(
TypeError: As of 3.10, the *loop* parameter was removed from Lock() since it is no longer necessary

It is surfacing from a libjuju dependency package `websockets`.

The problem in a nutshell, websockets>=10.0 adds support for python3.10(jammy) and drops
support for python3.6(b...

[Mert Kirpici (mertkirpici)]

In the previous comment I wrote:

> When the charm is built on python3.10(jammy), websockets==10 is installed, which does not support python3.6(bionic). Causing a similar error.

For completeness sake here is the output from that scenario:

Traceback (most recent call last):
  File "/usr/local/bin/auto_lint.py", line 34, in <module>
    from juju import loop # noqa E402
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/loop.py", line 1, in <module>
    from .jasyncio import * # noqa
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/juju/jasyncio.py", line 26, in <module>
    import websockets
  File "/var/lib/juju/agents/unit-juju-lint-0/charm/venv/websockets/__init__.py", line 1
    from __future__ import annotations
    ^
SyntaxError: future feature annotations is not defined

Which incidentally also shows that the previous issue encountered during the jammy support of charm-juju-backup-all has the exact same underlying reason:

https://git.launchpad.net/charm-juju-backup-all/commit/?id=6ec79a51eaf37a776b90c62aafddb5d17645c322