Support isolated pip.parse

[ouillie]

closes #3668

Adds a fallback at the end of build_config: when defaults["platforms"] is empty, it detects the host OS and CPU and injects a single platform entry. This fixes the test (and the patch works for my motivating use-case).

[gemini-code-assist]

Summary of Changes

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This pull request enhances the pip.parse extension to properly support isolated usage within Bazel modules. It addresses a scenario where rules_python's default platform tags might not be visible in an isolated context, by programmatically providing a minimal host platform configuration. This change ensures that requirement files can still be parsed and dependencies resolved, improving the robustness and flexibility of Python dependency management in Bazel.

Highlights

• Isolated pip.parse Support: Enabled pip.parse extensions to function correctly in isolated Bazel module contexts by ensuring a default host platform configuration is provided when no platforms are explicitly configured.
• New Integration Tests: Introduced a new integration test suite (pip_parse_isolated) to validate the functionality of pip.parse when used with isolate = True.

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Changelog

• .bazelrc.deleted_packages
  • Added tests/integration/pip_parse_isolated to the list of deleted packages.
• python/private/pypi/extension.bzl
  • Implemented logic to automatically configure a default host platform if no platforms are specified, specifically for isolated extension contexts.
• tests/integration/BUILD.bazel
  • Added a new rules_python_integration_test target named pip_parse_isolated_test.
• tests/integration/pip_parse_isolated/.bazelrc
  • Added a new Bazel configuration file for the isolated test, enabling experimental_isolated_extension_usages.
• tests/integration/pip_parse_isolated/BUILD.bazel
  • Added a py_test target test_isolated that depends on @pypi//six.
• tests/integration/pip_parse_isolated/MODULE.bazel
  • Defined a new module pip_parse_isolated that uses pip.parse with isolate = True to fetch six.
• tests/integration/pip_parse_isolated/requirements_lock.txt
  • Added a lock file specifying six==1.17.0.
• tests/integration/pip_parse_isolated/test_isolated.py
  • Added a Python unit test to verify that the six package can be imported successfully.

Activity

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Code Review

This pull request adds support for isolated pip.parse calls in bzlmod. The main change introduces logic to create a default host-based platform when no platforms are configured, which is the case in isolated mode. This allows pip.parse to function correctly. The PR also includes a comprehensive integration test to validate the new functionality. The changes are well-implemented and the tests cover the new feature appropriately. I have one minor suggestion to improve code readability.