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Add an in-memory cache for Git references (#2682)

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## Summary

Ensures that, even if we try to resolve the same Git reference twice
within an invocation, it always returns a (cached) consistent result.

Closes https://github.com/astral-sh/uv/issues/2673.

## Test Plan

```
❯ cargo run pip install git+https://github.com/pallets/flask.git --reinstall --no-cache
   Compiling uv-distribution v0.0.1 (/Users/crmarsh/workspace/uv/crates/uv-distribution)
   Compiling uv-resolver v0.0.1 (/Users/crmarsh/workspace/uv/crates/uv-resolver)
   Compiling uv-installer v0.0.1 (/Users/crmarsh/workspace/uv/crates/uv-installer)
   Compiling uv-dispatch v0.0.1 (/Users/crmarsh/workspace/uv/crates/uv-dispatch)
   Compiling uv-requirements v0.1.0 (/Users/crmarsh/workspace/uv/crates/uv-requirements)
   Compiling uv v0.1.24 (/Users/crmarsh/workspace/uv/crates/uv)
    Finished dev [unoptimized + debuginfo] target(s) in 3.95s
     Running `target/debug/uv pip install 'git+https://github.com/pallets/flask.git' --reinstall --no-cache`
 Updated https://github.com/pallets/flask.git (b90a4f1)
Resolved 7 packages in 280ms
   Built flask @ git+https://github.com/pallets/flask.git@b90a4f1f4a370e92054b9cc9db0efcb864f87ebe                                                                                                                                            Downloaded 7 packages in 212ms
Installed 7 packages in 9ms
```
This commit is contained in:
Charlie Marsh 2024-03-26 21:39:01 -04:00 • committed by GitHub
parent 32d8ee8ba3
commit ffd78d0821
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9 changed files with 161 additions and 86 deletions
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2
crates/uv-git/src/git.rs
View file

@ -23,7 +23,7 @@ use crate::FetchStrategy;
const CHECKOUT_READY_LOCK: &str = ".ok";
/// A reference to commit or commit-ish.
#[derive(Debug, Clone)]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub(crate) enum GitReference {
/// From a branch.
#[allow(unused)]

2
crates/uv-git/src/lib.rs
View file

@ -12,7 +12,7 @@ mod source;
mod util;
/// A URL reference to a Git repository.
#[derive(Debug, Clone)]
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct GitUrl {
/// The URL of the Git repository, with any query parameters and fragments removed.
repository: Url,

2
crates/uv-git/src/sha.rs
View file

@ -1,7 +1,7 @@
use std::str::FromStr;
/// A complete Git SHA, i.e., a 40-character hexadecimal representation of a Git commit.
#[derive(Debug, Copy, Clone)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
pub struct GitSha(git2::Oid);
impl GitSha {