[BUG] setup.cfg + pyproject.toml + setup.py (with PBR) breaking.

[synchronizing]

setuptools version

setuptools==64.0.0

Python version

Python 3.8.5

OS

macOS

Additional environment information

No response

Description

Reported originally in #3498. Unsure what is going on, but after the latest setuptools the following is thrown when using editable installs:

      distutils.errors.DistutilsSetupError: Error: setup script specifies an absolute path:
      
          /var/folders/r7/ggtlz3qs465bzrr2zjtf1h380000gp/T/tmpbr2b9x3w.build-temp/test.egg-info/SOURCES.txt
      
      setup() arguments must *always* be /-separated paths relative to the
      setup.py directory, *never* absolute paths.
      
      error: Support for editable installs via PEP 660 was recently introduced
      in `setuptools`. If you are seeing this error, please report to:
      
      https://github.com/pypa/setuptools/issues
      
      Meanwhile you can try the legacy behavior by setting an
      environment variable and trying to install again:
      
      SETUPTOOLS_ENABLE_FEATURES="legacy-editable"
      [end of output]

Expected behavior

No error should be thrown, and the package should be installed.

How to Reproduce

Here is a reproducible repo: https://github.com/synchronizing/setuptools-error

Running pip install -e . inside the folder will cause the error seen above. A few points:

• SETUPTOOLS_ENABLE_FEATURES flag fixes the issue.
• Installing it without being editable (pip install .) fixes the issue.
• Removing pyproject.toml fixes the issue.
• Removing pbr fixes the issue.
• Removing the other folder fixes the issue.

Output

See above.

[abravalheri]

Thank you very much for reporting this and for the reproducer.

I will investigate the issue and try to get back to you as soon as I can.

[synchronizing]

An interesting find. On the repo linked above, I added the following Dockerfile:

FROM python:3.8

RUN pip install --upgrade setuptools

WORKDIR /opt/
COPY . test
WORKDIR /opt/test
RUN pip install -e .

CMD ["/bin/bash"]

The above errors out with the same issue noted. Here are different version results:

Works:

• 3.8.0
• 3.8.1
• 3.8.5
• 3.8.10
• 3.8.11
• 3.8.12
• 3.9.0
• 3.9.1
• 3.9.4
• 3.9.5
• 3.9.9
• 3.9.10

Does not work:

• 3.8 (= 3.8.13)
• 3.9 (= 3.9.13)
• 3.9.12
• 3.9.11

Edit: See more below. This test doesn't seem solid enough.

[synchronizing]

I added Dockerfile and docker-compose.yml to the repo linked. Doing docker-compose up should result in the issue noted.

[abravalheri]

I also can reproduce the error in my machine with Python 3.8.10

[synchronizing]

3.8.10 seems to be working with the Dockerfile above, weirdly enough.

[synchronizing]

It's dependent on the release, and which Python base image is getting pulled based on the tag. Using Github Actions with the matrix functionality fails on all versions: https://github.com/synchronizing/setuptools-error/actions/runs/2841720491

Super weird, but at least its more reassuring this is happening in every version.

[abravalheri]

Thank you very much for helping to investigate that. I really appreciate all the effort.

[synchronizing]

Of course. Version 3.6.x works due to it being tied to setuptools 59.6.0.
See: https://github.com/synchronizing/setuptools-error/actions/runs/2841783973

[abravalheri]

Felipe, please let me know if v64.0.1 works for you, otherwise we can re-open this issue.

[synchronizing]

Yup, fixed! Thank you. https://github.com/synchronizing/setuptools-error/actions/runs/2843387978