Tzu-ping Chung <uranu...@gmail.com> added the comment:
Gentle ping again :) I’ve also created a PR for this.
> The Debian/Ubuntu packages have a local patch for distutils/setuptools
> introducing an --install-layout option. Maybe have the same for pip?
Pip already has a similar mechanism. The default layout is `prefix` and you can
change the installation prefix with `--prefix`; `home` and `user` layouts can
be specified with `--home={base}` and `--user`.
> So the problem to solve is
>
> - let a "sudo pip install" fail by default on the real system
> - let the same install succeed in a docker environment, or any other "image".
These need to be done in pip, so we’ll have a separate discussion on them
elsewhere.
> - behave transparently on venv and virtualenv installations.
This is what this issue tries to address. A distribution can overwrite
`sysconfig.get_default_scheme()` and `sysconfig.get_preferred_scheme(variant)`
to return the correct scheme based on whether the current Python is in a
virtual environment (by detecting `sys.prefix` and `sys.base_prefix`, I think).
When in a virtual environment, it can return the same scheme as the upstream.
Outside of a virtual environment, it can do whatever the platform sees fit, and
pip (or whatever calls sysconfig) will install things into wherever it’s told
to by the two functions.
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<https://bugs.python.org/issue43312>
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