Incorrect wheel tag for platform-dependent packages on PyPy

[mmaslowskicc]

• I am on the latest Poetry version.

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

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

• OS version and name: Debian GNU/Linux 10 (buster)

• Poetry version: 1.0.0

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/mmaslowskicc/7485e795e3c8fec873515981293fd17c

Issue

When running on PyPy and having the build key in pyproject.toml, Poetry chooses a wheel tags that is not supported by the platform, so it cannot be installed afterwards.

When running docker build . with files from the linked Gist:

Step 6/7 : RUN poetry build
 ---> Running in a893c9f76461
Creating virtualenv wheeltagtest-9TtSrW0h-py3.6 in /root/.cache/pypoetry/virtualenvs
Building wheeltagtest (0.1.0)
 - Building sdist
 - Built wheeltagtest-0.1.0.tar.gz

 - Building wheel
 - Built wheeltagtest-0.1.0-pp369-pypy36_pp73-linux_x86_64.whl
Removing intermediate container a893c9f76461
 ---> c99768df9fda
Step 7/7 : RUN poetry run pip install dist/*.whl
 ---> Running in 33d70ae40527
ERROR: wheeltagtest-0.1.0-pp369-pypy36_pp73-linux_x86_64.whl is not a supported wheel on this platform.
WARNING: You are using pip version 19.2.3, however version 19.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
The command '/bin/sh -c poetry run pip install dist/*.whl' returned a non-zero code: 1

A proper wheel tag would contain pp373 instead of pp369: this runs on PyPy 7.3.0 (which is otherwise compatible with Python 3.6.9).

[lambdaclan]

Might be related to #1616. There seems to be issues with platform detection in general.

[mmaslowskicc]

I did found this issue when working around #1616. If I install one package from wheel on CPython, a differently named package from wheel on PyPy, then I can install dependencies for the proper platform. However, if I build the platform-dependent wheel for PyPy using Poetry, I get the incorrect wheel tag and it isn't installable.

A fix is to use sys.pypy_version_info like in https://github.com/pypa/wheel/blob/master/wheel/pep425tags.py#L56 (with proper changes for obtaining versions from the virtualenv if one is used). I can fix it, but I'm not exactly sure how to test it properly (this probably needs being able to run Poetry tests on PyPy).

[mmaslowskicc]

packaging.tags has its own implementation of PEP 425 tags and pip master uses it. It considers pp36-pypy36_pp73-linux_x86_64 valid for this case, while both pp369 and pp373 are unsupported.

[gitonthescene]

Connecting related issue. #3509

[domvwt]

For anyone else waiting on this fix, the following shell script may be sufficient as a temporary workaround:

#!/bin/bash

# Rename the wheel file to match the currently active python version
wheel_file=$(find dist/ -type f -name '*.whl')
echo "Renaming ${wheel_file}"
python_ver=$(python -c 'import platform; print("".join(platform.python_version_tuple()[:2]))')
echo "Using Python version: ${python_ver}"
new_wheel_file=$(echo ${wheel_file} | sed "s/-cp[0-9]*/-cp${python_ver}/g")
echo "New wheel file name: ${new_wheel_file}"
mv ${wheel_file} ${new_wheel_file}