[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Petr Viktorin]

Petr Viktorin  added the comment:

Yes. This is a minor bug in the deprecated distutils module.

--
resolution:  -> wont fix
stage: patch review -> resolved
status: open -> closed

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[STINNER Victor]

STINNER Victor  added the comment:

Should we simply close the issue and leave distutils as it is?

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Diego Ramirez]

Change by Diego Ramirez :


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nosy: +DiddiLeija

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Petr Viktorin]

Petr Viktorin  added the comment:

(Sorry for the extra `and`; I hit Submit too soon)

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Petr Viktorin]

Petr Viktorin  added the comment:

AFAICS: this is a bug, but in deprecated code. Not worth fixing in 3.11, and 
definitely not worth fixing in a RC, and .

People should stop using distutils, and those who can't won't be happy with 
changes to it. Consider that existing distutils issues on bpo were already 
auto-closed.

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

I'm doing the release of 3.10.0rc2 as we speak. Please, review this ASAP or 
otherwise this PR will not be backported to 3.10.0 and will have to wait to 
3.10.1 as per the devguide.

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[STINNER Victor]

STINNER Victor  added the comment:

I wrote the PR 28204 to change the unix_home used by the distutils install 
command. Previous code:

if sys.version_info >= (3, 9) and key == "platlib":
# platlibdir is available since 3.9: bpo-1294959
value = value.replace("/lib/", "/$platlibdir/")
INSTALL_SCHEMES[main_key][key] = value

This code was added by:

commit 341e8a939aca6e9f59ffb0e6daee5888933694ed
Author: Lumír 'Frenzy' Balhar 
Date:   Wed Apr 14 17:12:34 2021 +0200

bpo-41282: (PEP 632) Load install schemes from sysconfig (GH-24549)

Modifying the unix_home was not the intended behavior.

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[STINNER Victor]

STINNER Victor  added the comment:

See also the email on python-dev:
https://mail.python.org/archives/list/python-...@python.org/thread/5UU6V2B3KBS4Z7OG5T7D6YQZASFNSBJM/

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[STINNER Victor]

Change by STINNER Victor :


--
pull_requests: +26628
pull_request: https://github.com/python/cpython/pull/28204

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 97b754d4b46ad9dd63f68906484f805931578c81 by Pablo Galindo Salgado 
in branch 'main':
Revert "bpo-45035: Make sysconfig posix_home depend on platlibdir (GH-28011)" 
(GH-28201)
https://github.com/python/cpython/commit/97b754d4b46ad9dd63f68906484f805931578c81


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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Ok, I am reverting PR 28011. Someone should check it again and decide what to 
do, but this won't enter 3.10

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
pull_requests: +26626
pull_request: https://github.com/python/cpython/pull/28201

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Petr Viktorin]

Petr Viktorin  added the comment:

The use case is a "personal stash of Python modules", described here: 
https://docs.python.org/3/install/#alternate-installation-the-home-scheme

We don't need the lib/lib64 distinction here.  I'd revert the 3.11 change and 
go with /lib/ only.

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Miro, Petr, do you think then that we should revert PR 28011

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Miro Hrončok]

Miro Hrončok  added the comment:

> I don't think we need to match the `/usr/` scheme here. For Python software 
> that's not part of a distro, I think just `lib/` is fine.

I agree.

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Hum, I reviewed PR 38011 and the change made sense to me, but If you think 
we should reconsider PR 28011, please say so ASAP because the 3.10 backport is 
close to be merged

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Petr Viktorin]

Petr Viktorin  added the comment:

Here, I'm not sure. What do people use --home for?

I don't think we need to match the `/usr/` scheme here. For Python software 
that's not part of a distro, I think just `lib/` is fine.

--
nosy: +petr.viktorin

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 4f88161f07538dfb24a43189fd59bf966cb40817 by Tzu-ping Chung in 
branch 'main':
bpo-45035: Make sysconfig posix_home depend on platlibdir (GH-28011)
https://github.com/python/cpython/commit/4f88161f07538dfb24a43189fd59bf966cb40817


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nosy: +pablogsal

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 5.0 -> 6.0
pull_requests: +26621
pull_request: https://github.com/python/cpython/pull/28196

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Tzu-ping Chung]

Change by Tzu-ping Chung :


--
keywords: +patch
pull_requests: +26454
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/28011

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[issue45035] sysconfig's posix_home scheme has different platlib value to distutils's unix_home

[Tzu-ping Chung]

New submission from Tzu-ping Chung :

This is similar to bpo-44860, but in the other direction:

$ docker run -it --rm -h=p fedora:34 bash
...
[root@p /]# yum install python3 -y
...
[root@p /]# type python3
python3 is hashed (/usr/bin/python3)
[root@p /]# python3 -V
Python 3.9.6
[root@p /]# python3.9 -q
>>> from distutils.command.install import install
>>> from distutils.dist import Distribution
>>> c = install(Distribution())
>>> c.home = '/foo'
>>> c.finalize_options()
>>> c.install_platlib
'/foo/lib64/python'
>>> import sysconfig
>>> sysconfig.get_path('platlib', 'posix_home', vars={'home': '/root'})
'/foo/lib/python'

sysconfig’s scheme should use `{platlib}` instead of hardcoding 'lib'.

Note that on Python 3.10+ the platlib values from distutils and sysconfig do 
match (since the distutils scheme is automatically generated from sysconfig), 
but the issue remains; sysconfig’s scheme should likely include `{platlib}` 
(adding Victor and Miro to confirm this).

--
components: Distutils, Library (Lib)
messages: 400463
nosy: dstufft, eric.araujo, hroncok, uranusjr, vstinner
priority: normal
severity: normal
status: open
title: sysconfig's posix_home scheme has different platlib value to distutils's 
unix_home
versions: Python 3.10, Python 3.11, Python 3.9

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