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Part of #11834 Currently, all Python installation are a streaming download-and-extract. With this PR, we add the `UV_PYTHON_CACHE_DIR` variable. When set, the installation is split into downloading the interpreter into `UV_PYTHON_CACHE_DIR` and extracting it there from a second step. If the archive is already present in `UV_PYTHON_CACHE_DIR`, we skip the download. The feature can be used to speed up tests and CI. Locally for me, `cargo test -p uv -- python_install` goes from 43s to 7s (1,7s in release mode) when setting `UV_PYTHON_CACHE_DIR`. It can also be used for offline installation of Python interpreter, by copying the archives to a directory in the offline machine, while the path rewriting is still performed on the target machine on installation. |
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