Version Control and Jujutsu

日本語版

Version Control and Jujutsu

Git is the foundation of modern development, yet few truly understand its internals. This guide dives deep into Git's internal object model, advanced operations, and the next-generation VCS Jujutsu (jj) -- exploring the depths of version control.

Target Audience

• Engineers who want to understand Git's internal architecture
• Developers looking to master advanced Git operations (rebase, bisect, reflog, etc.)
• Those interested in the next-generation VCS, Jujutsu

Prerequisites

• Basic Git operations (add, commit, push, pull, branch)
• Basic terminal operations

Study Guide

00-git-internals — Git Internals

01-advanced-git — Advanced Git Operations

02-jujutsu — Jujutsu (jj)

Quick Reference

Git Internal Objects:
  blob   — File contents
  tree   — Directory structure
  commit — Snapshot + metadata
  tag    — Named reference

Advanced Git Commands:
  git rebase -i HEAD~5        — Interactively edit the last 5 commits
  git bisect start/​bad/​good   — Identify the commit that introduced a bug
  git reflog                  — View HEAD movement history
  git worktree add ../​feature — Work on a branch in a separate directory
  git log -S "keyword"        — Search for code changes

Jujutsu (jj) Basics:
  jj init                     — Initialize a repository
  jj status                   — Check status
  jj describe -m "message"    — Set commit message
  jj new                      — Create a new change set
  jj squash                   — Squash into parent
  jj git push                 — Push to Git remote

References

1. Chacon, S. & Straub, B. "Pro Git." git-scm.com/​book, 2024.
2. Git. "Git Internals." git-scm.com/​book/​en/​v2/​Git-Internals, 2024.
3. Jujutsu. "Documentation." martinvonz.github.io/​jj, 2024.