874188c0ab
Fixes <https://issues.guix.gnu.org/50105>. * gnu/packages/aux-files/python/sitecustomize.py: Add a comment explaining the general idea, and use sys.prefix instead of sys.executable. (major_minor): Use the unpacking operator (*) to provide the arguments. (site_packages_prefix): Use os.path.join to form the path. (python_site): Likewise. Use sys.prefix instead of sys.executable. (all_sites_raw): Split on os.path.pathsep. (sys.path): Directly splice the result in the list. Suggested-by: Hartmut Goebel <h.goebel@crazy-compilers.com> Reported-by: Mathieu Othacehe <othacehe@gnu.org> Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
56 lines
2.1 KiB
Python
56 lines
2.1 KiB
Python
# -*- coding: utf-8 -*-
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# GNU Guix --- Functional package management for GNU
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# Copyright © 2021 Maxim Cournoyer <maxim.cournoyer@gmail.com>
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#
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# This file is part of GNU Guix.
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#
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# GNU Guix is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or (at
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# your option) any later version.
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#
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# GNU Guix is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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import os
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import sys
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# Commentary:
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#
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# Site-specific customization for Guix.
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#
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# The program below honors the GUIX_PYTHONPATH environment variable to
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# discover Python packages. File names appearing in this variable that match
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# a predefined versioned installation prefix are added to the sys.path. To be
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# considered, a Python package must be installed under the
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# 'lib/pythonX.Y/site-packages' directory, where X and Y are the major and
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# minor version numbers of the Python interpreter.
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#
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# Code:
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major_minor = '{}.{}'.format(*sys.version_info)
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site_packages_prefix = os.path.join(
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'lib', 'python' + major_minor, 'site-packages')
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python_site = os.path.join(sys.prefix, site_packages_prefix)
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try:
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all_sites_raw = os.environ['GUIX_PYTHONPATH'].split(os.path.pathsep)
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except KeyError:
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all_sites_raw = []
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# Normalize paths, otherwise a trailing slash would cause it to not match.
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all_sites_norm = [os.path.normpath(p) for p in all_sites_raw]
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matching_sites = [p for p in all_sites_norm
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if p.endswith(site_packages_prefix)]
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# Insert sites matching the current version into sys.path, right before
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# Python's own site. This way, the user can override the libraries provided
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# by Python itself.
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sys_path_absolute = [os.path.realpath(p) for p in sys.path]
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index = sys_path_absolute.index(python_site)
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sys.path[index:index] = matching_sites
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