#339 / v4.8.0 broke stevedore which broke bandit, openstackclient, flake8 and others

[mr-c]

Hello, #339 in v4.8.0 broke stevedore which broke bandit for at least myself (but probably others)

https://github.com/common-workflow-language/cwltool/pull/1482/checks?check_run_id=3454232416#step:9:50
PyCQA/bandit#730

Reverting to importlib_metadata version 4.7.1 resolves the problem for me

Originally posted by @mr-c in #339 (comment)

[Stannislav]

Same

$ bandit
Traceback (most recent call last):
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/_cache.py", line 159, in _get_data_for_path
    with open(filename, 'r') as f:
FileNotFoundError: [Errno 2] No such file or directory: '/Users/me/Library/Caches/Python Entry Points/f02c0770d01da06fbfcfe6435c8feb2e12f0e5fb7e239f6cf91d4d8d088821d8'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/me/project/.tox/lint/bin/bandit", line 5, in <module>
    from bandit.cli.main import main
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/bandit/__init__.py", line 19, in <module>
    from bandit.core import config  # noqa
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/bandit/core/__init__.py", line 17, in <module>
    from bandit.core import config  # noqa
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/bandit/core/config.py", line 12, in <module>
    from bandit.core import extension_loader
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/bandit/core/extension_loader.py", line 109, in <module>
    MANAGER = Manager()
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/bandit/core/extension_loader.py", line 25, in __init__
    self.load_formatters(formatters_namespace)
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/bandit/core/extension_loader.py", line 33, in load_formatters
    verify_requirements=False,
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/extension.py", line 136, in __init__
    verify_requirements)
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/extension.py", line 218, in _load_plugins
    for ep in self.list_entry_points():
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/extension.py", line 207, in list_entry_points
    eps = list(_cache.get_group_all(self.namespace))
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/_cache.py", line 179, in get_group_all
    data = self._get_data_for_path(path)
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/_cache.py", line 162, in _get_data_for_path
    data = _build_cacheable_data(path)
  File "/Users/me/project/.tox/lint/lib/python3.7/site-packages/stevedore/_cache.py", line 119, in _build_cacheable_data
    item = ep[:]  # convert namedtuple to tuple
TypeError: 'EntryPoint' object is not subscriptable

[freedge]

Seems to break openstack cli and rally testing as well. Opening https://storyboard.openstack.org/#!/story/2009151

[WilliamDEdwards]

Same here with flake8 (uses stevedore). I created a stevedore bug here: https://bugs.launchpad.net/python-stevedore/+bug/1941991

[jaraco]

Sorry for the inconvenience. I've yanked 4.8.0 while working out a remedy.

[jaraco]

I'd like devise a way to capture these requirements. I can see from the failure that stevedore is expecting __getitem__(slice) to return a tuple, something that namedtuple (or other tuple) would do implicitly.

[jaraco]

@mtreinish: You may wish to refrain from pinning too many projects as I've yanked the offending version and expect to release the next version without the broken behavior.

[mr-c]

Sorry for the inconvenience. I've yanked 4.8.0 while working out a remedy.

Thanks for the quick yank! I know this isn't nice news to receive.