internal(config_settings): make config_setting creation reusable (#1750)

The PR #1743 explored the idea of creating extra config settings for
each target platform that our toolchain is targetting, however that has
a drawback of not being usable in `bzlmod` if someone built Python for
a platform that we don't provide a toolchain for and tried to use the
`pip.parse` machinery with that by providing the
`python_interpreter_target`. That is a niche usecase, but `rules_python`
is a core ruleset that should only provide abstractions/helpers that
work in all cases or make it possible to extend things.

This explores a way to decouple the definition of the available
`config_settings` values and how they are constructed by adding an extra
`is_python_config_setting` macro, that could be used to declare the
config settings from within the `pip.parse` hub repo. This makes the
work in #1744 to support whl-only hub repos more self-contained.

Supersedes #1743.

---------

Co-authored-by: Richard Levasseur <rlevasseur@google.com>
5 files changed
tree: f4bd4ed6f799c02f8543766ce3c2b79fd90df15c
  1. .bazelci/
  2. .bcr/
  3. .ci/
  4. .github/
  5. docs/
  6. examples/
  7. gazelle/
  8. proposals/
  9. python/
  10. sphinxdocs/
  11. tests/
  12. third_party/
  13. tools/
  14. .bazelignore
  15. .bazelrc
  16. .bazelversion
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .pre-commit-config.yaml
  21. .readthedocs.yml
  22. addlicense.sh
  23. AUTHORS
  24. BUILD.bazel
  25. BZLMOD_SUPPORT.md
  26. CHANGELOG.md
  27. CONTRIBUTING.md
  28. CONTRIBUTORS
  29. DEVELOPING.md
  30. internal_deps.bzl
  31. internal_setup.bzl
  32. LICENSE
  33. MODULE.bazel
  34. README.md
  35. renovate.json
  36. version.bzl
  37. WORKSPACE
README.md

Python Rules for Bazel

Build status

Overview

This repository is the home of the core Python rules -- py_library, py_binary, py_test, py_proto_library, and related symbols that provide the basis for Python support in Bazel. It also contains package installation rules for integrating with PyPI and other indices.

Documentation for rules_python is at https://rules-python.readthedocs.io and in the Bazel Build Encyclopedia.

Examples live in the examples directory.

Currently, the core rules build into the Bazel binary, and the symbols in this repository are simple aliases. However, we are migrating the rules to Starlark and removing them from the Bazel binary. Therefore, the future-proof way to depend on Python rules is via this repository. SeeMigrating from the Bundled Rules below.

The core rules are stable. Their implementation in Bazel is subject to Bazel's backward compatibility policy. Once migrated to rules_python, they may evolve at a different rate, but this repository will still follow semantic versioning.

The Bazel community maintains this repository. Neither Google nor the Bazel team provides support for the code. However, this repository is part of the test suite used to vet new Bazel releases. See How to contribute page for information on our development workflow.

Documentation

For detailed documentation, see https://rules-python.readthedocs.io

Bzlmod support

  • Status: Beta
  • Full Feature Parity: No

See Bzlmod support for more details.