Mailing List Archive: [issue43976] Allow Python distributors to add custom site install schemes

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

> In the short term, and possible for the long term, Debian can continue to patch the install routine...

The problem with this approach is Setuptools is attempting to adopt distutils by exposing its own vendored copy of distutils as `distutils` (top-level name). By doing this, it bypasses the Debian's patching of distutils as found in CPython. Because this bypass behavior breaks distutils for Debian users, the functionality has been disabled (opt-in).

Setuptools would like to be able to present a version of distutils that, unpatched, runs on all the major platforms, and thus make it default.

That won't be possible until Debian can stop relying on its patching of distutils.

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Jason R. Coombs <jaraco@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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