Add build-system to pyproject.toml for pep517 (tox-wheel)

[altendky]

Stalled on:

• tox is too cowardly to handle PyPy on Windows tox-dev/tox#1850

[codecov]

Codecov Report

Merging #314 (5deee29) into master (00f19b4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #314   +/-   ##
=======================================
  Coverage   96.78%   96.78%           
=======================================
  Files          20       20           
  Lines        1183     1183           
  Branches      106      106           
=======================================
  Hits         1145     1145           
  Misses         20       20           
  Partials       18       18           

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[graingert]

might be worth doing a pipx run setup-py-upgrade . too

[altendky]

Welp, I was trying to do a quick i-lost-my-momentum-but-still-have-stuff-to-do-but-i-will-release-now-anyways release but... while we're reworking the project and defining the release process and automating publishing... :]

[altendky]

Kick CI

[altendky]

@gaborbernat, FYI related to tox-dev/tox#1850, it seems that PyPy itself is unable to create a venv. Further it does so without a failure exit code from what I can tell. I noticed this locally first but recreated in CI for sharing.

I would normally put this over in tox-dev/tox#1850 so anyone that looked would be aware, but I can't. I mention you just in case you were to spend some time on this, I wouldn't want you to do so without being aware of this. I'll try to dig into this in the PyPy direction later.

Note that this exploration was added in the separate PR https://github.com/twisted/towncrier/pull/321/files.

https://github.com/twisted/towncrier/pull/321/checks?check_run_id=1995458141

    - name: Try creating an env
      if: matrix.python.major == 3
      run: |
        python -m venv a_unique_env_directory
        tree /f a_unique_env_directory

2021-02-27T21:01:27.3134872Z �[36;1mpython -m venv a_unique_env_directory�[0m
2021-02-27T21:01:27.3135441Z �[36;1mtree /f a_unique_env_directory�[0m
2021-02-27T21:01:27.3200612Z shell: C:\Program Files\PowerShell\7\pwsh.EXE -command ". '{0}'"
2021-02-27T21:01:27.3201167Z env:
2021-02-27T21:01:27.3201713Z   pythonLocation: C:\hostedtoolcache\windows\PyPy\3.7.9\x86
2021-02-27T21:01:27.3202321Z ##[endgroup]
2021-02-27T21:01:28.0784308Z Unable to copy 'C:\\hostedtoolcache\\windows\\PyPy\\3.7.9\\x86\\venvlauncher.exe'
2021-02-27T21:01:28.2212747Z Error: [WinError 2] The system cannot find the file specified
2021-02-27T21:01:28.2590284Z Folder PATH listing for volume Temporary Storage
2021-02-27T21:01:28.2591041Z Volume serial number is 3672-F364
2021-02-27T21:01:28.2591678Z D:\A\TOWNCRIER\TOWNCRIER\A_UNIQUE_ENV_DIRECTORY
2021-02-27T21:01:28.2594289Z �   pyvenv.cfg
2021-02-27T21:01:28.2594893Z �   
2021-02-27T21:01:28.2595728Z ����Include
2021-02-27T21:01:28.2596391Z ����Lib
2021-02-27T21:01:28.2596961Z �   ����site-packages
2021-02-27T21:01:28.2598233Z ����Scripts
2021-02-27T21:01:28.2599258Z         libpypy3-c.dll
2021-02-27T21:01:28.2600784Z         pypy3.exe

[gaborbernat]

Unlocked.

[altendky]

Thanks.

For linkage, an updated copy of the above comment is included at tox-dev/tox#1850 (comment).

[gaborbernat]

Please open an issue at https://foss.heptapod.net/groups/pypy/-/issues and post back the link here 👍

[altendky]

#321 (comment)

@gaborbernat, I believe your report at pypa/virtualenv#2071 is 'in place of' the requested report to PyPy? Or do you still feel PyPy needs a change? I want to make sure I don't drop the ball on any of the paths here.

[gaborbernat]

I think pypy is here correct, virtualenv is the one mistaken.

[altendky]

Went with #323, for now at least.