Clarify the uv layer's use of arch in comments#583
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The uv download URL uses the buildpack's compile-time arch (Rust's `std::env::consts::ARCH`, e.g. `x86_64`) since that's how Astral names their archives, whereas the cache metadata uses the CNB target arch (e.g. `amd64`). Add comments explaining this, and also why the layer isn't invalidated on distro or Python version changes. Making this change to reduce both human and LLM confusion when reviewing the codebase. GUS-W-23022354.
colincasey
approved these changes
Jun 16, 2026
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The uv download URL uses the buildpack's compile-time arch (Rust's
std::env::consts::ARCH, e.g.x86_64) since that's how Astral names theirarchives, whereas the cache metadata uses the CNB target arch (e.g.
amd64).Add comments explaining this, and also why the layer isn't invalidated on
distro or Python version changes.
Making this change to reduce both human and LLM confusion when
reviewing the codebase.
GUS-W-23022354.