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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import * as fs from 'fs/promises';
import * as path from 'path';
import { isNodeError } from '../utils/errors.js';
import { isGitRepository } from '../utils/gitUtils.js';
import { exec } from 'node:child_process';
import { simpleGit, SimpleGit, CheckRepoActions } from 'simple-git';
export const historyDirName = '.gemini_cli_history';
export class GitService {
private projectRoot: string;
constructor(projectRoot: string) {
this.projectRoot = path.resolve(projectRoot);
}
async initialize(): Promise<void> {
if (!isGitRepository(this.projectRoot)) {
throw new Error('GitService requires a Git repository');
}
const gitAvailable = await this.verifyGitAvailability();
if (!gitAvailable) {
throw new Error('GitService requires Git to be installed');
}
this.setupHiddenGitRepository();
}
verifyGitAvailability(): Promise<boolean> {
return new Promise((resolve) => {
exec('git --version', (error) => {
if (error) {
resolve(false);
} else {
resolve(true);
}
});
});
}
/**
* Creates a hidden git repository in the project root.
* The Git repository is used to support checkpointing.
*/
async setupHiddenGitRepository() {
const historyDir = path.join(this.projectRoot, historyDirName);
const repoDir = path.join(historyDir, 'repository');
await fs.mkdir(repoDir, { recursive: true });
const repoInstance: SimpleGit = simpleGit(repoDir);
const isRepoDefined = await repoInstance.checkIsRepo(
CheckRepoActions.IS_REPO_ROOT,
);
if (!isRepoDefined) {
await repoInstance.init();
try {
await repoInstance.raw([
'worktree',
'add',
this.projectRoot,
'--force',
]);
} catch (error) {
console.log('Failed to add worktree:', error);
}
}
const visibileGitIgnorePath = path.join(this.projectRoot, '.gitignore');
const hiddenGitIgnorePath = path.join(repoDir, '.gitignore');
let visibileGitIgnoreContent = ``;
try {
visibileGitIgnoreContent = await fs.readFile(
visibileGitIgnorePath,
'utf-8',
);
} catch (error) {
if (isNodeError(error) && error.code !== 'ENOENT') {
throw error;
}
}
await fs.writeFile(hiddenGitIgnorePath, visibileGitIgnoreContent);
if (!visibileGitIgnoreContent.includes(historyDirName)) {
const updatedContent = `${visibileGitIgnoreContent}\n# Gemini CLI history directory\n${historyDirName}\n`;
await fs.writeFile(visibileGitIgnorePath, updatedContent);
}
const commit = await repoInstance.raw([
'rev-list',
'--all',
'--max-count=1',
]);
if (!commit) {
await repoInstance.add(hiddenGitIgnorePath);
await repoInstance.commit('Initial commit');
}
}
private get hiddenGitRepository(): SimpleGit {
const historyDir = path.join(this.projectRoot, historyDirName);
const repoDir = path.join(historyDir, 'repository');
return simpleGit(this.projectRoot).env({
GIT_DIR: path.join(repoDir, '.git'),
GIT_WORK_TREE: this.projectRoot,
});
}
async getCurrentCommitHash(): Promise<string> {
const hash = await this.hiddenGitRepository.raw('rev-parse', 'HEAD');
return hash.trim();
}
async createFileSnapshot(message: string): Promise<string> {
const repo = this.hiddenGitRepository;
await repo.add('.');
const commitResult = await repo.commit(message);
return commitResult.commit;
}
async restoreProjectFromSnapshot(commitHash: string): Promise<void> {
const repo = this.hiddenGitRepository;
await repo.raw(['restore', '--source', commitHash, '.']);
}
}
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