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32cc6ae273
Fix pylint errors that can be fixed and mask those that seem to be incorrect. Signed-off-by: Simon Glass <sjg@chromium.org>
92 lines
2.8 KiB
ReStructuredText
92 lines
2.8 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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Python code quality
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===================
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U-Boot has about 60k lines of Python code, mainly in the following areas:
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- tests
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- pytest hooks
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- patman patch submission tool
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- buildman build / analysis tool
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- dtoc devicetree-to-C tool
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- binman firmware packaging tool
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`PEP 8`_ is used for the code style, with the single quote (') used by default for
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strings and double quote for doc strings. All non-trivial functions should be
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commented.
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Pylint is used to help check this code and keep a consistent code style. The
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build system tracks the current 'score' of the source code and detects
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regressions in any module.
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To run this locally you should use this version of pylint::
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# pylint --version
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pylint 2.11.1
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astroid 2.8.6
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Python 3.8.10 (default, Sep 28 2021, 16:10:42)
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[GCC 9.3.0]
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You should be able to select and this install other required tools with::
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pip install pylint==2.11.1
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pip install -r test/py/requirements.txt
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pip install asteval pyopenssl
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Note that if your distribution is a year or two old, you make need to use `pip3`
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instead.
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To configure pylint, make sure it has docparams enabled, e.g. with::
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echo "[MASTER]" >> .pylintrc
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echo "load-plugins=pylint.extensions.docparams" >> .pylintrc
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Once everything is ready, use this to check the code::
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make pylint
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This creates a directory called `pylint.out` which contains the pylint output
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for each Python file in U-Boot. It also creates a summary file called
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`pylint.cur` which shows the pylint score for each module::
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_testing 0.83
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atf_bl31 -6.00
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atf_fip 0.49
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binman.cbfs_util 7.70
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binman.cbfs_util_test 9.19
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binman.cmdline 7.73
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binman.control 4.39
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binman.elf 6.42
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binman.elf_test 5.41
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...
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This file is in alphabetical order. The build system compares the score of each
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module to `scripts/pylint.base` (which must also be sorted and have exactly the
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same modules in it) and reports any files where the score has dropped. Use
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pylint to check what is wrong and fix up the code before you send out your
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patches.
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New or removed files results in an error which can be resolved by updating the
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`scripts/pylint.base` file to add/remove lines for those files, e.g.::
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meld pylint.cur scripts/pylint.base
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If the pylint version is updated in CI, this may result in needing to regenerate
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`scripts/pylint.base`.
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Checking for errors
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-------------------
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If you only want to check for pylint errors, use::
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PYTHONPATH=/path/to/scripts/dtc/pylibfdt/ make pylint_err
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This will show only pylint errors. Note that you must set PYTHONPATH to point
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to the pylibfdt directory build by U-Boot (typically the sandbox_spl board). If
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you have used `make qcheck` then it sill be in `board-sandbox_spl`.
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.. _`PEP 8`: https://www.python.org/dev/peps/pep-0008/
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