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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:

  1. Navigate to your Git repository's hooks directory:
  2. cd .git/hooks
  3. Create a new file named pre-commit:
  4. touch pre-commit
  5. Open the pre-commit file in a text editor and add the following code:
  6. #!/bin/sh
                    # Check for formatting
                    if ! npm run format; then
                        echo "Code is not properly formatted."
                        exit 1
                    fi
  7. Make the hook executable:
  8. 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.