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47.2.0 breaks entrypoint on installs >= 3.8

See original GitHub issue

I’m only opening is cause I see the following change log notes for 47.2.0:

* 2194: Editable-installed entry points now load significantly faster on Python versions 3.8+.

With bandersnatch moving to 47.2.0 our editable install no longer runs. The exception tho seems to be from our use of importlib. So we might need to go back to using the backport it seems but wanted to get thoughts here.

...
Using legacy setup.py install for bandersnatch, since package 'wheel' is not installed.
Installing collected packages: bandersnatch
    Running setup.py install for bandersnatch: started
    Running setup.py install for bandersnatch: finished with status 'done'
Successfully installed bandersnatch-4.1.0.dev2
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.8.3/x64/bin/bandersnatch", line 9, in <module>
    for entry_point in distribution('bandersnatch==4.1.0.dev2').entry_points:
  File "/opt/hostedtoolcache/Python/3.8.3/x64/lib/python3.8/importlib/metadata.py", line 504, in distribution
    return Distribution.from_name(distribution_name)
  File "/opt/hostedtoolcache/Python/3.8.3/x64/lib/python3.8/importlib/metadata.py", line 177, in from_name
    raise PackageNotFoundError(name)
importlib.metadata.PackageNotFoundError: bandersnatch==4.1.0.dev2

I’ve opened https://github.com/pypa/bandersnatch/issues/580 to triage and root cause this. Will close if I workout it’s indeed importlib.

Issue Analytics

State:
Created 3 years ago
Comments:12 (9 by maintainers)

Top GitHub Comments

3reactions

richardwhiukcommented, Jun 15, 2020

I did some digging.

distribution('bandersnatch==4.1.0.dev2') calls through to
https://github.com/python/cpython/blob/843c27765652e2322011fb3e5d88f4837de38c06/Lib/importlib/metadata.py#L518-L524 which calls through to
https://github.com/python/cpython/blob/843c27765652e2322011fb3e5d88f4837de38c06/Lib/importlib/_bootstrap_external.py#L1356-L1367 which calls through to
https://github.com/python/cpython/blob/843c27765652e2322011fb3e5d88f4837de38c06/Lib/importlib/metadata.py#L478-L488 which calls through to https://github.com/python/cpython/blob/843c27765652e2322011fb3e5d88f4837de38c06/Lib/importlib/metadata.py#L490-L496

This passes Prepared as Prepared("bandersnatch==4.1.0.dev2"), which then calls through to https://github.com/python/cpython/blob/843c27765652e2322011fb3e5d88f4837de38c06/Lib/importlib/metadata.py#L455-L473

This results in versionless_egg_name being bandersnatch==4.1.0.dev2, which is wrong on the face of it.

1reaction

jaracocommented, Jun 15, 2020

I believe 47.3.0 (releasing now) should fix this issue.

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