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aux-files: sitecustomize: Cleanup and add explanatory comments.

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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>
This commit is contained in:
Maxim Cournoyer 2021-08-03 20:41:20 -04:00
parent ac4417328d
commit 874188c0ab
No known key found for this signature in database
GPG key ID: 1260E46482E63562
1 changed files with 21 additions and 7 deletions
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28
gnu/packages/aux-files/python/sitecustomize.py
View file

@ -20,13 +20,26 @@
import os
import sys
python_root = os.path.realpath(sys.executable).split('/bin/')[0]
major_minor = '{}.{}'.format(sys.version_info[0], sys.version_info[1])
site_packages_prefix = 'lib/python' + major_minor + '/site-packages'
python_site = python_root + '/' + site_packages_prefix
# Commentary:
#
# Site-specific customization for Guix.
#
# The program below honors the GUIX_PYTHONPATH environment variable to
# discover Python packages. File names appearing in this variable that match
# a predefined versioned installation prefix are added to the sys.path. To be
# considered, a Python package must be installed under the
# 'lib/pythonX.Y/site-packages' directory, where X and Y are the major and
# minor version numbers of the Python interpreter.
#
# Code:
major_minor = '{}.{}'.format(*sys.version_info)
site_packages_prefix = os.path.join(
'lib', 'python' + major_minor, 'site-packages')
python_site = os.path.join(sys.prefix, site_packages_prefix)
try:
all_sites_raw = os.environ['GUIX_PYTHONPATH'].split(':')
all_sites_raw = os.environ['GUIX_PYTHONPATH'].split(os.path.pathsep)
except KeyError:
all_sites_raw = []
# Normalize paths, otherwise a trailing slash would cause it to not match.
@ -35,7 +48,8 @@ matching_sites = [p for p in all_sites_norm
if p.endswith(site_packages_prefix)]
# Insert sites matching the current version into sys.path, right before
# Python's own site.
# Python's own site. This way, the user can override the libraries provided
# by Python itself.
sys_path_absolute = [os.path.realpath(p) for p in sys.path]
index = sys_path_absolute.index(python_site)
sys.path = sys.path[:index] + matching_sites + sys.path[index:]
sys.path[index:index] = matching_sites