git_hooks

git hooks

Automate actions at Git events.

📁 Hook Location

Hooks are in .git/hooks/

ls .git/hooks/

Lists available hook samples.

📊 Hook Types

graph TD
    A[Client Hooks] --> B[pre-commit]
    A --> C[commit-msg]
    A --> D[pre-push]
    E[Server Hooks] --> F[pre-receive]
    E --> G[post-receive]

🔧 Create Hook

Make Hook File

touch .git/hooks/pre-commit

Creates hook file.

Make Executable

chmod +x .git/hooks/pre-commit

Makes hook executable (required).

📋 Common Client Hooks

pre-commit

Runs before commit is created.

#!/bin/bash
# .git/hooks/pre-commit

npm test

Exit non-zero to cancel commit.

commit-msg

Validates commit message.

#!/bin/bash
# .git/hooks/commit-msg

message=$(cat "$1")
if ! [[ "$message" =~ ^(feat|fix|docs): ]]; then
    echo "Error: Message must start with feat:, fix:, or docs:"
    exit 1
fi

Enforces commit message format.

pre-push

Runs before push.

#!/bin/bash
# .git/hooks/pre-push

npm test

Cancel push if tests fail.

post-checkout

Runs after checkout.

#!/bin/bash
# .git/hooks/post-checkout

npm install

Install dependencies after checkout.

📦 Sharing Hooks

Create Hooks Directory

mkdir .githooks

Create hooks in version control.

Configure Git to Use

git config core.hooksPath .githooks

Points Git to shared hooks.

🛠️ Hook Management Tools

Install Husky

npm install husky --save-dev

Popular hook manager for Node.js projects.

Initialize Husky

npx husky install

Sets up Husky.

Add Husky Pre-commit

npx husky add .husky/pre-commit "npm test"

Adds pre-commit hook.

Install pre-commit (Python)

pip install pre-commit

Python-based hook manager.

Run pre-commit Install

pre-commit install

Installs hooks from config.

📋 Example .pre-commit-config.yaml

repos:
  - repo: https://github.com/pre-commit/pre-commit-hooks
    rev: v4.4.0
    hooks:
      - id: trailing-whitespace
      - id: end-of-file-fixer

Configuration for pre-commit.

⏭️ Skip Hooks

Skip Pre-commit

git commit --no-verify -m "Message"

Skips pre-commit and commit-msg hooks.

Skip Pre-push

git push --no-verify

Skips pre-push hooks.

💡 Tips

🔗 Related

• Bisect
• CI/CD

#git #hooks #automation #advanced