fix(gazelle): correct runfiles path handling in gazelle_python_manifest test (#3398)

## Summary

This PR fixes the `gazelle_python_manifest.test` failure on Linux CI by
correcting the runfiles path handling in both the Bazel rule definition
and the Go test code.

Fixes #3397

## Problem

The test was failing on Linux but passing on macOS due to inconsistent
file path handling:
- Used `$(rootpath)` instead of `$(rlocationpath)` in the Bazel rule
- Resolved runfiles paths but then didn't use the resolved values

See issue #3397 for full technical details.

## Changes

### `gazelle/manifest/defs.bzl`
- Line 120: Changed `$(rootpath)` to `$(rlocationpath)` for
`_TEST_MANIFEST`
- Line 122: Changed `$(rootpath)` to `$(rlocationpath)` for
`_TEST_REQUIREMENTS`

This makes them consistent with the existing
`_TEST_MANIFEST_GENERATOR_HASH` which already used `$(rlocationpath)`.

### `gazelle/manifest/test/test.go`
- Line 53: Use `manifestPathResolved` instead of `manifestPath` in
`manifestFile.Decode()`
- Line 73: Use `requirementsPathResolved` instead of `requirementsPath`
in `os.Open()`
- Lines 84-86: Use `manifestPathResolved` instead of `manifestPath` in
error handling

The test was already calling `runfiles.Rlocation()` to resolve the
paths, but then wasn't using the resolved values.

## Testing

Tested on Linux by running:
```bash
cd gazelle/examples/bzlmod_build_file_generation
bazel test //:gazelle_python_manifest.test
```

Result: ✅ **PASSED**

## Notes

- This fix aligns with Bazel's recommended runfiles handling practices
- All changes follow the existing pattern used for
`_TEST_MANIFEST_GENERATOR_HASH`
- Some code generation was assisted by Claude AI, but the human author
has reviewed, tested, and takes full responsibility for all changes per
the [contribution
guidelines](https://github.com/bazel-contrib/rules_python/blob/main/CONTRIBUTING.md#ai-assisted-contributions)

**Disclaimer**: This is my first contribution to this project, so I'm
not entirely certain this is the correct contribution method. Please let
me know if any changes to the PR process are needed. Happy to make
adjustments!
3 files changed
tree: d5ffe12227a575570151840a7ec739cfb1892488
  1. .bazelci/
  2. .bcr/
  3. .ci/
  4. .github/
  5. docs/
  6. examples/
  7. gazelle/
  8. private/
  9. python/
  10. sphinxdocs/
  11. tests/
  12. tools/
  13. .bazelignore
  14. .bazelrc
  15. .bazelversion
  16. .editorconfig
  17. .git-blame-ignore-revs
  18. .gitattributes
  19. .gitignore
  20. .pre-commit-config.yaml
  21. .python-version
  22. .readthedocs.yml
  23. addlicense.sh
  24. AGENTS.md
  25. AUTHORS
  26. BUILD.bazel
  27. BZLMOD_SUPPORT.md
  28. CHANGELOG.md
  29. CONTRIBUTING.md
  30. CONTRIBUTORS
  31. GEMINI.md
  32. internal_dev_deps.bzl
  33. internal_dev_setup.bzl
  34. LICENSE
  35. MODULE.bazel
  36. README.md
  37. RELEASING.md
  38. version.bzl
  39. WORKSPACE
  40. 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

See Bzlmod support for more details.