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What is a hook?

Learn that a hook is an event-triggered script.

What Is a Git Hook?

A Git hook is a script that runs automatically when specific Git events occur. These scripts are located in the repository's .git/hooks directory and can be triggered before or after operations such as commits. This lets you automate repetitive checks instead of performing them manually.

.git/hooks/
  pre-commit
  commit-msg

The Location of Hook Files

Git hook files are located in the repository's .git/hooks directory by default. When a repository is initialized with git init, example files with the .sample extension are placed in this directory. To enable a hook, you can remove the extension from the relevant sample file and prepare an executable script.

.git/hooks/pre-commit.sample
.git/hooks/commit-msg.sample

Hooks run in the local repository; these scripts are not automatically shared when another user clones the repository.

Practice Build a Hook File Path

Assign the path of the pre-commit file inside the .git/hooks directory to the hookPath variable. Then print the path.

Starter code

terminal
// Hook dosyasının yolunu tanımla
const hookPath = "";

// Yolu yazdır

Sample solution

terminal
const hookPath = ".git/hooks/pre-commit";
console.log(hookPath);

Expected output

.git/hooks/pre-commit

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What is the main purpose of Git hooks?

  • Automatically deleting all repository branches
  • Encrypting commit history
  • Converting a remote repository into a local repository
  • Running scripts during specific Git events Correct answer

Explanation: Hooks are scripts associated with specific Git events and run automatically when those events occur.

2 Complete the Hook Directory

Question 
.git/____/pre-commit
Answer 
.git/hooks/pre-commit

Explanation: Git hook files are stored in the .git/hooks directory by default.

3 Basic Hook Concepts

Term Meaning
Hook Event-triggered script
.git/hooks Directory for hook files
Event Event that starts a script
.sample Sample hook extension

All lessons in Advanced

1 Interactive rebase

  1. rebase -i
  2. pick reword squash
  3. edit drop
  4. Summary - Interactive rebase

2 Bisect

  1. git bisect
  2. good and bad
  3. Automatic bisect
  4. Summary - Bisect

3 Blame

  1. git blame
  2. Line history
  3. blame -L
  4. Summary - Blame

4 Submodule

  1. What is a submodule?
  2. submodule add
  3. submodule update
  4. Summary - Submodule

5 Worktree

  1. git worktree
  2. worktree add
  3. worktree list
  4. Summary - Worktree

6 Hooks

  1. What is a hook?
  2. pre-commit
  3. commit-msg
  4. Summary - Hooks

7 Advanced log

  1. --graph
  2. --format
  3. --since --until
  4. Summary - Advanced log

8 Archive

  1. git archive
  2. zip and tar
  3. Specific branch
  4. Summary - Archive

9 Advanced stash

  1. stash -u
  2. stash branch
  3. stash show -p
  4. Summary - Advanced stash

10 Advanced cherry-pick

  1. cherry-pick -n
  2. cherry-pick range
  3. cherry-pick strategy
  4. Summary - Advanced cherry-pick

11 Actions workflow

  1. matrix
  2. cache
  3. secrets
  4. Summary - Actions workflow

12 GitHub Pages

  1. What is Pages?
  2. Branch publish
  3. Custom domain
  4. Summary - GitHub Pages

13 Branch protection

  1. Protected branch
  2. Required review
  3. Status check
  4. Summary - Branch protection

14 Advanced final

  1. Rebase
  2. Bisect
  3. Submodule
  4. Hook