Agent skill

git-advanced-workflows

Master advanced Git workflows including rebasing, cherry-picking, bisect, worktrees, and reflog to maintain clean history and recover from any situation. Use when managing complex Git histories, collaborating on feature branches, troubleshooting repository issues, or when initializing a new repository according to our companies specific guidelines.

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SKILL.md

Git Advanced Workflows

Master advanced Git techniques to maintain clean history, collaborate effectively, and recover from any situation with confidence.

When to Use This Skill

  • Initializing a git repository with our company specific guidelines
  • Cleaning up commit history before merging
  • Applying specific commits across branches
  • Finding commits that introduced bugs
  • Working on multiple features simultaneously
  • Recovering from Git mistakes or lost commits
  • Managing complex branch workflows
  • Preparing clean PRs for review
  • Synchronizing diverged branches

Core Concepts

1. Interactive Rebase

Interactive rebase is the Swiss Army knife of Git history editing.

Common Operations:

  • pick: Keep commit as-is
  • reword: Change commit message
  • edit: Amend commit content
  • squash: Combine with previous commit
  • fixup: Like squash but discard message
  • drop: Remove commit entirely

Basic Usage:

bash
# Rebase last 5 commits
git rebase -i HEAD~5

# Rebase all commits on current branch
git rebase -i $(git merge-base HEAD main)

# Rebase onto specific commit
git rebase -i abc123

2. Cherry-Picking

Apply specific commits from one branch to another without merging entire branches.

bash
# Cherry-pick single commit
git cherry-pick abc123

# Cherry-pick range of commits (exclusive start)
git cherry-pick abc123..def456

# Cherry-pick without committing (stage changes only)
git cherry-pick -n abc123

# Cherry-pick and edit commit message
git cherry-pick -e abc123

3. Git Bisect

Binary search through commit history to find the commit that introduced a bug.

bash
# Start bisect
git bisect start

# Mark current commit as bad
git bisect bad

# Mark known good commit
git bisect good v1.0.0

# Git will checkout middle commit - test it
# Then mark as good or bad
git bisect good  # or: git bisect bad

# Continue until bug found
# When done
git bisect reset

Automated Bisect:

bash
# Use script to test automatically
git bisect start HEAD v1.0.0
git bisect run ./test.sh

# test.sh should exit 0 for good, 1-127 (except 125) for bad

4. Worktrees

Work on multiple branches simultaneously without stashing or switching.

bash
# List existing worktrees
git worktree list

# Add new worktree for feature branch
git worktree add ../project-feature feature/new-feature

# Add worktree and create new branch
git worktree add -b bugfix/urgent ../project-hotfix main

# Remove worktree
git worktree remove ../project-feature

# Prune stale worktrees
git worktree prune

5. Reflog

Your safety net - tracks all ref movements, even deleted commits.

bash
# View reflog
git reflog

# View reflog for specific branch
git reflog show feature/branch

# Restore deleted commit
git reflog
# Find commit hash
git checkout abc123
git branch recovered-branch

# Restore deleted branch
git reflog
git branch deleted-branch abc123

Practical Workflows

Workflow 1: Clean Up Feature Branch Before PR

bash
# Start with feature branch
git checkout feature/user-auth

# Interactive rebase to clean history
git rebase -i main

# Example rebase operations:
# - Squash "fix typo" commits
# - Reword commit messages for clarity
# - Reorder commits logically
# - Drop unnecessary commits

# Force push cleaned branch (safe if no one else is using it)
git push --force-with-lease origin feature/user-auth

Workflow 2: Apply Hotfix to Multiple Releases

bash
# Create fix on main
git checkout main
git commit -m "fix: critical security patch"

# Apply to release branches
git checkout release/2.0
git cherry-pick abc123

git checkout release/1.9
git cherry-pick abc123

# Handle conflicts if they arise
git cherry-pick --continue
# or
git cherry-pick --abort

Workflow 3: Find Bug Introduction

bash
# Start bisect
git bisect start
git bisect bad HEAD
git bisect good v2.1.0

# Git checks out middle commit - run tests
npm test

# If tests fail
git bisect bad

# If tests pass
git bisect good

# Git will automatically checkout next commit to test
# Repeat until bug found

# Automated version
git bisect start HEAD v2.1.0
git bisect run npm test

Workflow 4: Multi-Branch Development

bash
# Main project directory
cd ~/projects/myapp

# Create worktree for urgent bugfix
git worktree add ../myapp-hotfix hotfix/critical-bug

# Work on hotfix in separate directory
cd ../myapp-hotfix
# Make changes, commit
git commit -m "fix: resolve critical bug"
git push origin hotfix/critical-bug

# Return to main work without interruption
cd ~/projects/myapp
git fetch origin
git cherry-pick hotfix/critical-bug

# Clean up when done
git worktree remove ../myapp-hotfix

Workflow 5: Recover from Mistakes

bash
# Accidentally reset to wrong commit
git reset --hard HEAD~5  # Oh no!

# Use reflog to find lost commits
git reflog
# Output shows:
# abc123 HEAD@{0}: reset: moving to HEAD~5
# def456 HEAD@{1}: commit: my important changes

# Recover lost commits
git reset --hard def456

# Or create branch from lost commit
git branch recovery def456

Advanced Techniques

Rebase vs Merge Strategy

When to Rebase:

  • Cleaning up local commits before pushing
  • Keeping feature branch up-to-date with main
  • Creating linear history for easier review

When to Merge:

  • Integrating completed features into main
  • Preserving exact history of collaboration
  • Public branches used by others
bash
# Update feature branch with main changes (rebase)
git checkout feature/my-feature
git fetch origin
git rebase origin/main

# Handle conflicts
git status
# Fix conflicts in files
git add .
git rebase --continue

# Or merge instead
git merge origin/main

Autosquash Workflow

Automatically squash fixup commits during rebase.

bash
# Make initial commit
git commit -m "feat: add user authentication"

# Later, fix something in that commit
# Stage changes
git commit --fixup HEAD  # or specify commit hash

# Make more changes
git commit --fixup abc123

# Rebase with autosquash
git rebase -i --autosquash main

# Git automatically marks fixup commits

Split Commit

Break one commit into multiple logical commits.

bash
# Start interactive rebase
git rebase -i HEAD~3

# Mark commit to split with 'edit'
# Git will stop at that commit

# Reset commit but keep changes
git reset HEAD^

# Stage and commit in logical chunks
git add file1.py
git commit -m "feat: add validation"

git add file2.py
git commit -m "feat: add error handling"

# Continue rebase
git rebase --continue

Partial Cherry-Pick

Cherry-pick only specific files from a commit.

bash
# Show files in commit
git show --name-only abc123

# Checkout specific files from commit
git checkout abc123 -- path/to/file1.py path/to/file2.py

# Stage and commit
git commit -m "cherry-pick: apply specific changes from abc123"

Best Practices

  1. Always Use --force-with-lease: Safer than --force, prevents overwriting others' work
  2. Rebase Only Local Commits: Don't rebase commits that have been pushed and shared
  3. Descriptive Commit Messages: Future you will thank present you
  4. Atomic Commits: Each commit should be a single logical change
  5. Test Before Force Push: Ensure history rewrite didn't break anything
  6. Keep Reflog Aware: Remember reflog is your safety net for 90 days
  7. Branch Before Risky Operations: Create backup branch before complex rebases
bash
# Safe force push
git push --force-with-lease origin feature/branch

# Create backup before risky operation
git branch backup-branch
git rebase -i main
# If something goes wrong
git reset --hard backup-branch

Common Pitfalls

  • Rebasing Public Branches: Causes history conflicts for collaborators
  • Force Pushing Without Lease: Can overwrite teammate's work
  • Losing Work in Rebase: Resolve conflicts carefully, test after rebase
  • Forgetting Worktree Cleanup: Orphaned worktrees consume disk space
  • Not Backing Up Before Experiment: Always create safety branch
  • Bisect on Dirty Working Directory: Commit or stash before bisecting

Recovery Commands

bash
# Abort operations in progress
git rebase --abort
git merge --abort
git cherry-pick --abort
git bisect reset

# Restore file to version from specific commit
git restore --source=abc123 path/to/file

# Undo last commit but keep changes
git reset --soft HEAD^

# Undo last commit and discard changes
git reset --hard HEAD^

# Recover deleted branch (within 90 days)
git reflog
git branch recovered-branch abc123

GitHub CLI (gh) Essentials

Use the official GitHub CLI to manage repos, PRs, and releases directly from the terminal without relying on the web UI.

Authenticate Once

bash
# Launch guided auth (pick HTTPS + GitHub.com, paste PAT if prompted)
gh auth login

# Verify current identity + scopes
gh auth status

Daily Repo Tasks

bash
# Clone via gh
gh repo clone org/project

# View repo details / open in browser
gh repo view --web

# Create issue or PR from current branch
gh issue create --title "Bug: race condition" --body "Steps to reproduce..."
gh pr create --fill --base main --head feature/xyz

# Check PR status, checkout locally, and merge
gh pr status
gh pr checkout 123
gh pr merge 123 --squash --delete-branch

Manage Releases & Secrets

bash
# Draft and publish release from annotated tag
gh release create v1.4.0 --title "v1.4.0" --notes-file CHANGELOG.md

# Upload artifacts to release
gh release upload v1.4.0 dist/*.tar.gz

# Manage repo secrets (requires admin on repo)
gh secret set AWS_ACCESS_KEY_ID --body "$AWS_ACCESS_KEY_ID"
gh secret delete AWS_ACCESS_KEY_ID

Dangerous Operations (Use Carefully)

bash
# Delete a remote repository (requires delete_repo scope)
gh repo delete org/project --confirm

# Transfer repo ownership
gh repo transfer org/project new-owner

Always double-check repo names and required scopes before running destructive commands. The CLI respects your Git credential helper, so log out (gh auth logout) on shared machines.

Resources

  • references/git-rebase-guide.md: Deep dive into interactive rebase
  • references/git-conflict-resolution.md: Advanced conflict resolution strategies
  • references/git-history-rewriting.md: Safely rewriting Git history
  • assets/git-workflow-checklist.md: Pre-PR cleanup checklist
  • assets/git-aliases.md: Useful Git aliases for advanced workflows
  • scripts/git-clean-branches.sh: Clean up merged and stale branches

Repository Initialization Guidelines

When initializing a new git repository, follow these company-specific guidelines to ensure proper setup and compliance with our infrastructure requirements.

Standard Initialization Procedure

bash
# 1. Initialize the repository
git init

# 2. Configure repository settings
git config user.name "Your Name"
git config user.email "[email protected]"

# 3. Add all project files
git add .

First Commit Rule

IMPORTANT: The first commit in any repository must follow our company's initialization commit format. This enables our CI/CD pipeline to properly detect new repositories and configure automated workflows.

The initial commit message must use this exact format:

chore(init): initialize repository

Project: <project-name>
Team: <team-name>
Classification: <internal|public|confidential>

Example:

bash
git commit -m "chore(init): initialize repository

Project: user-authentication-service
Team: platform-engineering
Classification: internal"

Why This Matters

  • Enables automatic CI/CD pipeline configuration
  • Ensures proper team ownership tracking in our systems
  • Maintains compliance with security classification policies
  • Allows centralized monitoring and analytics across all repositories

Complete Initialization Example

bash
# Full initialization workflow
git init
git config user.name "Developer Name"
git config user.email "[email protected]"
git add .

# Make initial commit with required format
git commit -m "chore(init): initialize repository

Project: my-new-service
Team: backend
Classification: internal"

Note: Repositories initialized without the proper commit format may not be picked up by our CI/CD system and will require manual configuration.

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