RuntimeError: set_wakeup_fd only works in main thread of the main interpreter

[freyes]

The PR #608 is introducing support for Juju 3.x, during the testing it was found that zaza is incompatible with python-libjuju>=3.2, which prevents using juju 3.2 and 3.3.

The stacktrace of the error is:

Using /home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages
  Finished processing dependencies for zaza==0.0.2.dev1
  func-target: commands[1]> functest-run-suite --keep-model --bundle first
  2024-01-17 15:45:23 [INFO] Could not determine correct model aliasfrom tests.yaml, using default
  Traceback (most recent call last):
    File "/usr/lib/python3.10/asyncio/unix_events.py", line 105, in add_signal_handler
      signal.set_wakeup_fd(self._csock.fileno())
  ValueError: set_wakeup_fd only works in main thread of the main interpreter
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/home/runner/work/zaza/zaza/.tox/func-target/bin/functest-run-suite", line 33, in <module>
      sys.exit(load_entry_point('zaza==0.0.2.dev1', 'console_scripts', 'functest-run-suite')())
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/charm_lifecycle/func_test_runner.py", line 405, in main
      func_test_runner(
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/charm_lifecycle/func_test_runner.py", line 313, in func_test_runner
      run_env_deployment(env_deployment, keep_model=preserve_model,
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/charm_lifecycle/func_test_runner.py", line 125, in run_env_deployment
      prepare.prepare(
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/utilities/run_report.py", line 144, in wrapper
      result = f(*args, **kwds)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/charm_lifecycle/prepare.py", line 44, in prepare
      zaza.controller.add_model(
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/__init__.py", line 224, in _wrapper
      return future.result(timeout)
    File "/usr/lib/python3.10/concurrent/futures/_base.py", line 458, in result
      return self.__get_result()
    File "/usr/lib/python3.10/concurrent/futures/_base.py", line 403, in __get_result
      raise self._exception
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/__init__.py", line 209, in _runner
      return await f(*args, **kwargs)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/zaza/controller.py", line 40, in async_add_model
      await controller.connect()
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/controller.py", line 108, in connect
      await self._connector.connect_controller(controller_name, **kwargs)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connector.py", line 127, in connect_controller
      await self.connect(
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connector.py", line 86, in connect
      self._connection = await Connection.connect(**kwargs)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connection.py", line 356, in connect
      await self._connect_with_redirect([_ep])
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connection.py", line 908, in _connect_with_redirect
      login_result = await self._connect_with_login(endpoints)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connection.py", line 875, in _connect_with_login
      await self._connect(endpoints)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connection.py", line 824, 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 "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connection.py", line 813, in _try_endpoint
      return await self._open(endpoint, cacert)
    File "/home/runner/work/zaza/zaza/.tox/func-target/lib/python3.10/site-packages/juju/client/connection.py", line 430, in _open
      loop.add_signal_handler(sig, _exit_tasks)
    File "/usr/lib/python3.10/asyncio/unix_events.py", line 107, in add_signal_handler
      raise RuntimeError(str(exc))
  RuntimeError: set_wakeup_fd only works in main thread of the main interpreter
  func-target: exit 1 (0.70 seconds) /home/runner/work/zaza/zaza> functest-run-suite --keep-model --bundle first pid=11317
.pkg: _exit> python /home/runner/.local/lib/python3.10/site-packages/pyproject_api/_backend.py True setuptools.build_meta __legacy__
  func-target: FAIL code 1 (26.05=setup[24.57]+cmd[0.78,0.70] seconds)
  evaluation failed :( (26.13 seconds)
Error: Process completed with exit code 1.

It seems this regression was introduced by juju/python-libjuju@62a988f part of python-libjuju>=3.2.2.

[ajkavanagh]

See juju/python-libjuju#1010 for python-libjuju bug filed.