[issue43976] Allow Python distributors to add custom site install schemes

[Jason R. Coombs]

Jason R. Coombs <jaraco at jaraco.com> added the comment:

Here's what I propose:

1. In pypa/distutils, add support for honoring the proposed install schemes (based on PR 25718). Merge with Setuptools.
2. Add whatever ugly hacks are needed to pypa/distutils to honor other Debian-specific behaviors (revive https://github.com/pypa/distutils/pull/4 but properly match Debian expectations). Mark these ugly hacks as deprecated.
3. In Debian, Fedora, etc, provide patches that configure the install schemes. Test with latest Setuptools and SETUPTOOLS_USE_DISTUTILS=local.
4. Formalize the install schemes support in CPython (as in PR 25718).
5. Ask Debian to propose more a cleaner interface for Debian-specific needs.

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