fix(bzlmod): let workspace-invoked python_register_toolchains to register toolchains (#2289)

While migrating to bzlmod, users may have a hybrid build where WORKSPACE
contains
python_register_toolchain() calls. Because these calls originate from
WORKSPACE files,
the `native.register_toolchain` APIs are still available. At the same
time, we still
detect that bzlmod is enabled, and thus disable calling those functions.
The net
effect is, users aren't able to register toolchains in such a hybrid
setup. At the
same time, because the code path is shared, we can't have the bzlmod
toolchain code
try to call them, as it'll fail.

To accomodate both cases, have the bzlmod toolchain code pass a special
arg so that
`python_register_toolchains` knows to skip parts that don't apply to the
bzlmod toolchain
invocation.

This was all unwound by some users and pointed out in a Slack thread. A
few people are
manually carrying an equivalent patch for a working hybrid mode.

Fixes https://github.com/bazelbuild/rules_python/issues/1675
4 files changed
tree: 0e34571d394682586dac7801b1cf67185a7380b7
  1. .bazelci/
  2. .bcr/
  3. .ci/
  4. .github/
  5. docs/
  6. examples/
  7. gazelle/
  8. python/
  9. sphinxdocs/
  10. tests/
  11. third_party/
  12. tools/
  13. .bazelignore
  14. .bazelrc
  15. .bazelversion
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .pre-commit-config.yaml
  20. .readthedocs.yml
  21. addlicense.sh
  22. AUTHORS
  23. BUILD.bazel
  24. BZLMOD_SUPPORT.md
  25. CHANGELOG.md
  26. CONTRIBUTING.md
  27. CONTRIBUTORS
  28. DEVELOPING.md
  29. internal_deps.bzl
  30. internal_setup.bzl
  31. LICENSE
  32. MODULE.bazel
  33. README.md
  34. version.bzl
  35. WORKSPACE
  36. WORKSPACE.bzlmod
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.

The core rules are stable. Their implementation is subject to Bazel's backward compatibility policy. This repository aims to 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.