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codex/codex-rs/git-utils
Charlie Marsh 54ef99a365 Disable empty Cargo test targets (#21584)
## Summary

`cargo test` has entails both running standard Rust tests and doctests.
It turns out that the doctest discovery is fairly slow, and it's a cost
you pay even for crates that don't include any doctests.

This PR disables doctests with `doctest = false` for crates that lack
any doctests.

For the collection of crates below, this speeds up test execution by
>4x.

E.g., before this PR:

```
Benchmark 1: cargo test     -p codex-utils-absolute-path     -p codex-utils-cache     -p codex-utils-cli     -p codex-utils-home-dir     -p codex-utils-output-truncation     -p codex-utils-path     -p codex-utils-string     -p codex-utils-template     -p codex-utils-elapsed     -p codex-utils-json-to-toml
  Time (mean ± σ):      1.849 s ±  4.455 s    [User: 0.752 s, System: 1.367 s]
  Range (min … max):    0.418 s … 14.529 s    10 runs
```

And after:

```
Benchmark 1: cargo test     -p codex-utils-absolute-path     -p codex-utils-cache     -p codex-utils-cli     -p codex-utils-home-dir     -p codex-utils-output-truncation     -p codex-utils-path     -p codex-utils-string     -p codex-utils-template     -p codex-utils-elapsed     -p codex-utils-json-to-toml
  Time (mean ± σ):     428.6 ms ±   6.9 ms    [User: 187.7 ms, System: 219.7 ms]
  Range (min … max):   418.0 ms … 436.8 ms    10 runs
```

For a single crate, with >2x speedup, before:

```
Benchmark 1: cargo test -p codex-utils-string
  Time (mean ± σ):     491.1 ms ±   9.0 ms    [User: 229.8 ms, System: 234.9 ms]
  Range (min … max):   480.9 ms … 512.0 ms    10 runs
```

And after:

```
Benchmark 1: cargo test -p codex-utils-string
  Time (mean ± σ):     213.9 ms ±   4.3 ms    [User: 112.8 ms, System: 84.0 ms]
  Range (min … max):   206.8 ms … 221.0 ms    13 runs
```

Co-authored-by: Codex <noreply@openai.com>
2026-05-07 15:44:17 -07:00
..
2026-04-27 18:48:57 -07:00
2026-04-27 18:48:57 -07:00

codex-git-utils

Helpers for interacting with git, including patch application. The crate also exposes a lightweight baseline API for internal directories that use git only as a resettable diff mechanism: ensure_git_baseline_repository preserves a usable root/.git baseline or creates one when it is missing or unusable, reset_git_repository replaces root/.git with a fresh one-commit baseline, and diff_since_latest_init returns structured file changes plus a unified diff from that baseline to the current directory contents.

use std::path::Path;

use codex_git_utils::{apply_git_patch, ApplyGitRequest};

let repo = Path::new("/path/to/repo");

// Apply a patch (omitted here) to the repository.
let request = ApplyGitRequest {
    cwd: repo.to_path_buf(),
    diff: String::from("...diff contents..."),
    revert: false,
    preflight: false,
};
let result = apply_git_patch(&request)?;