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Env variables for python downloads (#6416)

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## Summary

Resolves #6406

## Test Plan

```
❯ UV_PYTHON_PREFERENCE=only-managed cargo run -q -- sync --show-settings | rg python_preference
    python_preference: OnlyManaged,
❯ UV_PYTHON_PREFERENCE=system cargo run -q -- sync --show-settings | rg python_preference
    python_preference: System,
❯ UV_NO_PYTHON_DOWNLOADS=1 cargo run -q -- sync --show-settings | rg python_downloads
    python_downloads: Never,
❯ UV_ALLOW_PYTHON_DOWNLOADS=1 cargo run -q -- sync --show-settings | rg python_downloads
    python_downloads: Automatic,
```
This commit is contained in:
Ahmed Ilyas
2024-08-22 14:52:52 +02:00
committed by GitHub
parent a3a5b82a17
commit bbd9adaa40
3 changed files with 50 additions and 24 deletions
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docs/configuration/environment.md
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@@ -69,6 +69,10 @@ In addition, uv respects the following environment variables:
packages.
- `UV_TOOL_DIR`: Used to specify the directory where uv will store managed tools.
- `UV_TOOL_BIN_DIR`: Used to specify the "bin" directory where uv will install tool executables.
- `UV_NO_PYTHON_DOWNLOADS`: Disable automatic downloads of Python.
- `UV_ALLOW_PYTHON_DOWNLOADS`: Allow automatically downloading Python when required.
- `UV_PYTHON_PREFERENCE`: Whether to prefer using Python installations that are already present on
the system, or those that are downloaded and installed by uv.
- `UV_PYTHON_INSTALL_DIR`: Used to specify the directory where uv will store managed Python
installations.
- `UV_PYTHON_INSTALL_MIRROR`: Managed Python installations are downloaded from