Git Hooks
Introduction
Git Hooks are scripts that Git executes before or after events such as commits, pushes, and receives. They allow automation of tasks and can enhance workflows by enforcing rules or executing scripts in response to certain actions.
What are Git Hooks?
Git Hooks are custom scripts that run at specific points in the Git workflow. They are stored in the .git/hooks
directory of your repository and can be used to check the state of your code, enforce guidelines, or automate processes.
There are two types of hooks: client-side hooks (run on your local machine) and server-side hooks (run on the remote repository).
Types of Git Hooks
There are many types of Git hooks, but the most commonly used include:
- pre-commit
- prepare-commit-msg
- commit-msg
- post-commit
- pre-push
- post-receive
Creating a Git Hook
Creating a Git hook is straightforward. Here’s a step-by-step process to create a basic pre-commit
hook that checks for code formatting:
- Navigate to your Git repository's hooks directory:
- Create a new file named
pre-commit
: - Open the
pre-commit
file in a text editor and add the following code: - Make the hook executable:
cd .git/hooks
touch pre-commit
#!/bin/sh
# Check for formatting
if ! npm run format; then
echo "Code is not properly formatted."
exit 1
fi
chmod +x pre-commit
Best Practices
When working with Git hooks, consider the following best practices:
- Keep hooks simple and fast.
- Document your hooks for team members.
- Use hooks to enforce coding standards.
- Test hooks thoroughly before deploying.
FAQ
Can hooks be shared among team members?
Yes, you can share hooks by including them in your repository and using a setup script to install them in the .git/hooks
directory.
What happens if a hook fails?
If a hook fails, it can prevent the action from completing. For instance, a failing pre-commit
hook will stop the commit process.
Are there any built-in hooks?
Yes, Git provides sample hooks in the .git/hooks
directory that can be modified to suit your needs.