Helpers for interacting with git, including patch application and worktree snapshot utilities. The crate also exposes a lightweight baseline API for internal directories that use git only as a resettable diff mechanism: 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, create_ghost_commit, restore_ghost_commit, ApplyGitRequest,
    CreateGhostCommitOptions,
};

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)?;

// Capture the current working tree as an unreferenced commit.
let ghost = create_ghost_commit(&CreateGhostCommitOptions::new(repo))?;

// Later, undo back to that state.
restore_ghost_commit(repo, &ghost)?;

Pass a custom message with .message("…") or force-include ignored files with .force_include(["ignored.log".into()]).