## Summary
Like https://github.com/astral-sh/uv/pull/4808 but with a few more
changes. I suspect this will require some bikeshedding but I find the
use of "installation" and "installed" in the same sentence to be kind of
a lot.
## Summary
Check the sha256 checksum when downloading a managed python toolchain.
## Test Plan
```sh
$ cargo run -- python install 3.12
warning: `uv python install` is experimental and may change without warning.
Looking for installation Python 3.12.3 (any-3.12.3-any-any-any)
Downloading cpython-3.12.3-windows-x86_64-none
Installed Python 3.12.3 to C:\Users\jo\AppData\Roaming\uv\data\python\cpython-3.12.3-windows-x86_64-none
Installed 1 installation in 6s
$ cargo run -- python uninstall 3.12
$ # manually change the hash in `crates/uv-python/src/downloads.inc`
$ cargo run -- python install 3.12
warning: `uv python install` is experimental and may change without warning.
Looking for installation Python 3.12 (any-3.12-any-any-any)
Downloading cpython-3.12.3-windows-x86_64-none
error: Hash mismatch for `cpython-3.12.3-windows-x86_64-none`
Expected:
xx
Computed:
776568c92c5f3b47dbf5f17c1c58578f70d75a32654419a158aa8bdc6f95b09a
```
Whew this is a lot.
The user-facing changes are:
- `uv toolchain` to `uv python` e.g. `uv python find`, `uv python
install`, ...
- `UV_TOOLCHAIN_DIR` to` UV_PYTHON_INSTALL_DIR`
- `<UV_STATE_DIR>/toolchains` to `<UV_STATE_DIR>/python` (with
[automatic
migration](https://github.com/astral-sh/uv/pull/4735/files#r1663029330))
- User-facing messages no longer refer to toolchains, instead using
"Python", "Python versions" or "Python installations"
The internal changes are:
- `uv-toolchain` crate to `uv-python`
- `Toolchain` no longer referenced in type names
- Dropped unused `SystemPython` type (previously replaced)
- Clarified the type names for "managed Python installations"
- (more little things)
Charlie Marsh