What Are Git Hooks: Automate Git Actions Easily

Git hooks are scripts that run automatically at specific points in the git workflow, like before a commit or after a push. They let you automate tasks such as checking code style or running tests by placing executable scripts in the .git/hooks folder.

How It Works

Git hooks act like automatic reminders or helpers that run at certain moments during your work with git. Imagine you have a checklist you want to follow every time you save your work or share it with others. Instead of doing it manually, git hooks do it for you.

These hooks are small scripts stored inside your project’s .git/hooks folder. When you perform actions like committing changes or pushing code, git looks for these scripts and runs them if they exist. This way, you can add custom checks or tasks that happen without you needing to remember them.

Example

This example shows a simple pre-commit hook that checks if your commit message is not empty. If the message is empty, it stops the commit.

sh

#!/bin/sh

if [ -z "$(git log -1 --pretty=%B)" ]; then
  echo "Error: Commit message is empty. Please add a message."
  exit 1
fi
exit 0

Output

Error: Commit message is empty. Please add a message.

When to Use

Use git hooks when you want to automate checks or tasks during your git workflow. For example, you can run tests before allowing a commit, check code style, or send notifications after pushing code. This helps keep your code clean and your team informed without extra manual work.

Common uses include:

• Running automated tests before commits
• Checking code formatting or linting
• Preventing commits with sensitive data
• Automatically updating documentation

Key Points

• Git hooks are scripts triggered by git actions like commit or push.
• They live in the .git/hooks directory of your project.
• Hooks can stop actions if checks fail, helping maintain code quality.
• You can write hooks in any scripting language your system supports.
• Hooks run locally and are not shared by default, so teams often share them via other means.

Key Takeaways

Git hooks automate tasks by running scripts at key git events like commit or push.

Hooks live in the .git/hooks folder and must be executable to work.

Use hooks to enforce code quality, run tests, or automate repetitive tasks.

Hooks run locally and need manual sharing for team use.

You can write hooks in any scripting language supported by your system.