I Rebuilt Git Without Git — 3,390 Lines of Python, Zero Dependencies

说明与用途

在单个 Python 文件中实现了完整的版本控制系统，完全不依赖外部库，包含 141 条测试、30 条命令以及自定义同步协议。

问题

Reimplement a full Git‑like version control system using only Python’s standard library, eliminating external dependencies.

结果

A fully functional Git‑like VCS implemented in a single Python file with no external dependencies, 141 tests, and a custom sync protocol.

工作流

• 1. Design content‑addressed object model using hashlib.sha256 and zlib. 2. Implement staging area with JSON index mapping paths to blob hashes. 3. Build three‑way merge logic using difflib.SequenceMatcher. 4. Add 30 Git‑style commands (init, add, commit, branch, checkout, merge, etc.). 5. Create custom networking protocol over socket for clone/fetch/push. 6. Replace external libraries with stdlib equivalents (difflib, zlib, json, argparse, socket, fnmatch, unittest, os.walk). 7. Write 141 unit tests covering all features. 8. Verify reproducibility via SHA‑256 checksum of source file. 9. Run the tool with simple commands: python3 pygit_single.py init; python3 pygit_single.py add .; python3 pygit_single.py commit -m "First commit".

证据

3,390 lines. 1 Python file. 141 tests. 30 commands. 0 external dependencies.

来源

The substitution table ended up looking like this: GitPython / dulwich / pygit2 → My own implementation, difflib, zlib, json, argparse, socket, fnmatch, unittest, os.walk.

来源