Summary of Changes

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This pull request refines the uv_repository rule by adjusting its return mechanism to leverage Bazel's repo_metadata feature. This modification is key for enabling the rule to interact effectively with Bazel's remote repository content cache, which will enhance build performance and consistency when fetching uv toolchain dependencies. The implementation also includes a safeguard to ensure backward compatibility with older Bazel versions that may not yet support this specific API.

Highlights

• Repository Rule Return Value: The _uv_repo_impl function now returns repository_ctx.repo_metadata instead of a plain dictionary, which is essential for Bazel's remote repository content caching.
• Bazel Version Compatibility: A check has been added to ensure compatibility with Bazel versions older than 8.3.0, which may not have the repo_metadata attribute on repository_ctx.
• Remote Cache Utilization: This change enables the uv repository rule to properly utilize Bazel's remote repository content cache, leading to more efficient dependency fetching.

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Changelog

• python/uv/private/uv_repository.bzl
  • Modified the _uv_repo_impl function to return repository_ctx.repo_metadata for improved caching capabilities.
  • Introduced a conditional check for the presence of repository_ctx.repo_metadata to maintain compatibility with older Bazel versions.

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