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As described in #4242, we're currently incorrectly downloading glibc python-build-standalone on musl target, but we also can't fix this by using musl python-build-standalone on musl targets since the musl builds are effectively broken. We reintroduce the libc detection previously removed in #2381, using it to detect which libc is the current one before we have a python interpreter. I changed the strategy a big to support an empty `PATH` which we use in the tests. For simplicity, i've decided to just filter out the musl python-build-standalone archives from the list of available archive, given this is temporary. This means we show the same error message as if we don't have a build for the platform. We could also add a dedicated error message for musl. Fixes #4242 ## Test Plan Tested manually. On my ubuntu host, python downloads continue to pass: ``` target/x86_64-unknown-linux-musl/debug/uv python install ``` On alpine, we fail: ``` $ docker run -it --rm -v .:/io alpine /io/target/x86_64-unknown-linux-musl/debug/uv python install Searching for Python installations error: No download found for request: cpython-any-linux-x86_64-musl ``` |
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