Poetry doesn't recognize setuptools based project if it has no setup.py (only setup.cfg)

[fmagin]

• [x] I am on the latest Poetry version.

• [x] I have searched the issues of this repo and believe that this is not a duplicate.

• [x] If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: Arch Linux

• Poetry version: 1.2.0b1

• Link of a Gist with the contents of your pyproject.toml file: https://github.com/angr/angr-dev/blob/28531802747918c5610e3e5f239d98eb9015afd4/pyproject.toml

Issue

the angr project has various subprojects that only have a setup.cfg file and no setup.py file. This results in poetry throwing an exception when trying to use them as a local path package: i.e. Directory /home/fmagin/Projects/angr-dev/archinfo does not seem to be a Python package. in poetry/core/packages/directory_dependency.py:54. Specifically this happens because the check only checks if a setup.py exists or if the pyproject.toml has tool.poetry keys. Both aren't true for the angr subprojects. If I edit the poetry source code and add a check for the existence of setup.cfg file then poetry works as expected (and like if I had specified the dependency as a pinned git commit from GitHub directly), so I am considering this a bug

[abn]

@fmagin can you try the fix at https://github.com/python-poetry/poetry-core/pull/368#issue-1246356001 please?

[fmagin]

@abn yep that fix works! I searched the previous issues for setup.cfg and didn't find any, so I didn't realize there was such a recent issue/PR for this already

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