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2021-02-03build/python: Handle FileNotFoundError exception in sanity-check.py....This exception was thrown while running the sanity-check on the python-isort package, which doesn't make use of a setuptools-based build system but rather of a PEP 517 compliant one. * gnu/packages/aux-files/python/sanity-check.py: Handle the FileNotFoundError whe attempting to read the 'top_level.txt' metadata file of the package. Remove extraneous 'continue' statement. Maxim Cournoyer
2021-02-01build/python: Add a sanity check phase....Add a new phase validating the usability of installed Python packages. * gnu/packages/aux-files/python/sanity-check.py: New file. * Makefile.am (AUX_FILES): Register it. * guix/build-system/python.scm (sanity-check.py): New variable. (lower): Add the script as an implicit input. * guix/build/python-build-system.scm: Remove trailing #t. (sanity-check): New phase. (%standard-phases): Use it. * tests/builders.scm: (make-python-dummy) (dummy-ok, dummy-dummy-nosetuptools, dummy-fail-requirements) (dummy-fail-import, dummy-fail-console-script): New variables. ("python-build-system: dummy-ok") ("python-build-system: dummy-dummy-nosetuptools") ("python-build-system: dummy-fail-requirements") ("python-build-system: dummy-fail-import") ("python-build-system: dummy-fail-console-script"): Add tests. Lars-Dominik Braun
2021-02-01gnu: python: Replace PYTHONPATH by GUIX_PYTHONPATH....Using PYTHONPATH as a mean to discover the Python packages had the following issues: 1. It is not versioned, so different versions of Python would clash if installed in a shared profile. 2. It would interfere with the host Python site on foreign distributions, sometimes preventing a a user to login their GDM session (!). 3. It would take precedence over user installed Python packages installed through pip. 4. It would leak into Python virtualenvs, which are supposed to create isolated Python environments. This changes fixes the above issues by making use of a sitecustomize.py module. The newly introduced GUIX_PYTHONPATH environment variable is read from the environment, filtered for the current Python version of the interpreter, and spliced in 'sys.path' just before Python's own site location, which provides the expected behavior. * gnu/packages/aux-files/python/sitecustomize.py: New file. * Makefile.am: Register it. * gnu/packages/python.scm (customize-site) (guix-pythonpath-search-path): New procedures. (python-2.7)[phases]{install-sitecustomize.py}: New phase. [native-inputs]{sitecustomize.py}: New input. [native-search-paths]: Replace PYTHONPATH with GUIX_PYTHONPATH. (python-3.9)[native-search-paths]: Likewise. [phases]{install-sitecustomize}: Override with correct version. [native-search-paths]: Replace PYTHONPATH with GUIX_PYTHONPATH. * gnu/packages/commencement.scm (python-boot0): [phases]{install-sitecustomize}: Likewise. [native-inputs]{sitecustomize.py}: New input. [native-search-paths]: Replace PYTHONPATH with GUIX_PYTHONPATH. * guix/build/python-build-system.scm (site-packages): Do not add a trailing '/'. squash! gnu: python: Replace PYTHONPATH by GUIX_PYTHONPATH. Maxim Cournoyer