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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 * as os from 'os';
import * as crypto from 'crypto';
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 class GitService {
private projectRoot: string;
constructor(projectRoot: string) {
this.projectRoot = path.resolve(projectRoot);
}
private getHistoryDir(): string {
const hash = crypto
.createHash('sha256')
.update(this.projectRoot)
.digest('hex');
return path.join(os.homedir(), '.gemini', 'history', hash);
}
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.setupShadowGitRepository();
}
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 setupShadowGitRepository() {
const repoDir = this.getHistoryDir();
await fs.mkdir(repoDir, { recursive: true });
const isRepoDefined = await simpleGit(repoDir).checkIsRepo(
CheckRepoActions.IS_REPO_ROOT,
);
if (!isRepoDefined) {
await simpleGit(repoDir).init(false, {
'--initial-branch': 'main',
});
const repo = simpleGit(repoDir);
await repo.commit('Initial commit', { '--allow-empty': null });
}
const userGitIgnorePath = path.join(this.projectRoot, '.gitignore');
const shadowGitIgnorePath = path.join(repoDir, '.gitignore');
let userGitIgnoreContent = '';
try {
userGitIgnoreContent = await fs.readFile(userGitIgnorePath, 'utf-8');
} catch (error) {
if (isNodeError(error) && error.code !== 'ENOENT') {
throw error;
}
}
await fs.writeFile(shadowGitIgnorePath, userGitIgnoreContent);
}
private get shadowGitRepository(): SimpleGit {
const repoDir = this.getHistoryDir();
return simpleGit(this.projectRoot).env({
GIT_DIR: path.join(repoDir, '.git'),
GIT_WORK_TREE: this.projectRoot,
});
}
async getCurrentCommitHash(): Promise<string> {
const hash = await this.shadowGitRepository.raw('rev-parse', 'HEAD');
return hash.trim();
}
async createFileSnapshot(message: string): Promise<string> {
const repo = this.shadowGitRepository;
await repo.add('.');
const commitResult = await repo.commit(message);
return commitResult.commit;
}
async restoreProjectFromSnapshot(commitHash: string): Promise<void> {
const repo = this.shadowGitRepository;
await repo.raw(['restore', '--source', commitHash, '.']);
// Removes any untracked files that were introduced post snapshot.
await repo.clean('f', ['-d']);
}
}
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