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name: worktree-setup-hook description: "Post-checkout git hook for automatic worktree setup. Use when: (1) Setting up automatic configuration for new git worktrees, (2) Creating post-checkout hooks that detect new worktrees and run setup tasks, (3) Configuring worktrees to automatically copy env files and install dependencies"

Worktree Setup Hook

Provides a post-checkout git hook template that automatically configures new git worktrees by detecting new worktree creation and running setup tasks.

Overview

The hook detects when a new worktree is created (not a regular checkout) and automatically:

• Copies environment files (.env, .env.local, etc.)
• Detects the project's package manager and installs dependencies
• Runs setup scripts if available

Quick Start

Install the hook template:

Copycp .cursor/skills/worktree-setup-hook/assets/hook-templates/post-checkout .git/hooks/post-checkout
chmod +x .git/hooks/post-checkout

The hook will automatically run after git worktree add completes.

How It Works

Worktree Detection

The hook detects new worktrees by checking if the previous HEAD is the null-ref (0000000000000000000000000000000000000000). This is how git indicates a new worktree creation.

Setup Tasks

1. Environment Files: Copies .env.example to .env, .env.local.example to .env.local, or copies env files from the main worktree
2. Package Manager Detection: Automatically detects and installs dependencies:
   • package.json → npm or yarn
   • requirements.txt → pip
   • Cargo.toml → cargo
   • go.mod → go
   • Gemfile → bundle
3. Setup Scripts: Runs setup.sh or scripts/setup.sh if present and executable

Installation

See setup-guide.md for detailed installation instructions, including:

• Step-by-step installation
• Handling existing hooks
• Backup procedures
• Troubleshooting

Customization

The hook is a standard POSIX shell script. Edit .git/hooks/post-checkout to add custom setup steps or modify behavior.

Resources

• Hook Template: assets/hook-templates/post-checkout - The main hook script
• Setup Guide: references/setup-guide.md - Detailed installation and configuration instructions