Ansible 6 support

[moreati]

No description provided.

[extmind]

I've tried this branch with Ansible 2.13 and Python 3.10. Its not clear to me if the error is the same as in CI, but here are my findings. While execution only stops later, this is the first traceback that I get:

[mux  212055] 17:05:06.914298 D mitogen: While importing 'ansible.module_utils.basic'
Traceback (most recent call last):
  File ".../mitogen/mitogen/master.py", line 1134, in _send_module_and_related
    tup = self._build_tuple(fullname)
  File ".../mitogen/mitogen/master.py", line 1087, in _build_tuple
    for name in self._finder.find_related(fullname)
  File ".../mitogen/mitogen/master.py", line 959, in find_related
    names = self.find_related_imports(name)
  File ".../mitogen/mitogen/master.py", line 933, in find_related_imports
    set(
  File ".../mitogen/mitogen/master.py", line 937, in <genexpr>
    and not is_stdlib_name(name)
  File ".../mitogen/mitogen/master.py", line 140, in is_stdlib_name
    modpath = os.path.abspath(getattr(module, '__file__', ''))
  File "/usr/lib/python3.10/posixpath.py", line 378, in abspath
    path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not NoneType

This is caused by calling is_stdlib_name with jaraco which has its __file__ attribute set to None (as is explicitly allowed in Python's reference). jaraco is installed on my system as a dependency for setuptools.
This can be fixed by modpath = os.path.abspath(getattr(module, '__file__', '') or '') which would then let the function correctly return False, but this may not be adequate in a future situation. Another possibility may be to use a module's __path__ instead of __file__ which would be set in jaraco's case, but may also be empty according to the reference.
I think the best solution would be to replace this machinery altogether by importlib.sys.stdlib_module_names, but I don't know if this is available for all versions that mitogen tries to support. However, it probably should be the preferred variant if available.