build: Export runtime_env_toolchain_interpreter.sh file

[hofbi]

I am working on bazelbuild/bazel#27674 towards bazelbuild/bazel#10225 to flip incompatible_no_implicit_file_export. I found that https://github.com/bazelbuild/bazel/blob/master/src/test/py/bazel/bzlmod/bazel_repo_mapping_test.py and https://github.com/bazelbuild/bazel/blob/master/src/test/py/bazel/bzlmod/bazel_module_test.py require runtime_env_toolchain_interpreter.sh. Since it is no longer implicitly exported after flipping the flag, we have to export it explicitly.

[gemini-code-assist]

Summary of Changes

Hello @hofbi, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves a build issue encountered when enabling the incompatible_no_implicit_file_export flag in Bazel. It ensures that a critical shell script, runtime_env_toolchain_interpreter.sh, remains accessible to a specific test by explicitly declaring its export, thereby maintaining the build's integrity and compatibility with the new flag behavior.

Highlights

• Explicit File Export: The runtime_env_toolchain_interpreter.sh file is now explicitly exported in python/private/BUILD.bazel. This change is necessary because the incompatible_no_implicit_file_export flag, when flipped, prevents implicit export of this file, which is required by bazel_repo_mapping_test.py.

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[gemini-code-assist]

Code Review

This pull request correctly identifies the need to export runtime_env_toolchain_interpreter.sh to support the incompatible_no_implicit_file_export flag. However, the exports_files declaration is missing an explicit visibility, which means it defaults to private. This would prevent the file from being used by other packages, defeating the purpose of the change. I've recommended adding public visibility to ensure the file is accessible to all consumers of the toolchain.

[gemini-code-assist]

This exports_files declaration is missing a visibility attribute, so it defaults to private (//visibility:private). This means runtime_env_toolchain_interpreter.sh will only be accessible within the python/private package. However, since it's part of a toolchain used by other packages, it needs to be public. Please add visibility = ["//visibility:public"] to align with other exported toolchain files in this package, like python_bootstrap_template.txt.

Suggested change

	exports_files(["runtime_env_toolchain_interpreter.sh"])
	exports_files(["runtime_env_toolchain_interpreter.sh"], visibility = ["//visibility:public"])