Creating custom hook scripts in Git - Quick Revision & Summary

Recall & Review

beginner

What is a Git hook?

A Git hook is a script that Git runs before or after events like commits, pushes, or merges. It helps automate tasks.

beginner

Where do you place custom Git hook scripts?

Custom Git hook scripts go inside the .git/hooks folder of your repository.

beginner

How do you make a Git hook script executable?

You run chmod +x <hook-script> to make the script executable so Git can run it.

beginner

Name two common Git hook types you can customize.

Two common hooks are pre-commit (runs before a commit) and post-commit (runs after a commit).

intermediate

What happens if a pre-commit hook script exits with a non-zero status?

Git stops the commit process and shows an error. This lets you prevent bad commits.

Where should you place a custom Git hook script?

A root folder of the project

B .git/hooks folder

C any folder in your home directory

D inside the .gitignore file

Git looks for hook scripts inside the .git/hooks folder of the repository.

What command makes a Git hook script executable?

A chmod 777 <hook-script>

B git hook enable <hook-script>

C chmod +x <hook-script>

D git run-hook <hook-script>

chmod +x sets the executable permission needed for Git to run the hook script.

Which hook runs before a commit is finalized?

A post-merge

B post-commit

C pre-push

D pre-commit

The pre-commit hook runs before the commit is saved, allowing checks or validations.

What happens if a pre-commit hook script returns a non-zero exit code?

A The commit is stopped

B The commit proceeds normally

C Git deletes the commit

D Git ignores the hook

A non-zero exit code signals failure, so Git stops the commit to prevent errors.

Which language can you use to write Git hook scripts?

A Any scripting language like Bash, Python, or Perl

B Only Git's own language

C Only compiled languages like C

D Only JavaScript

Git hooks are scripts and can be written in any language your system can run.

Explain how to create and enable a custom pre-commit Git hook script.

Think about where the script goes and how Git runs it.

Describe what happens when a Git hook script fails during a commit.

Focus on the effect of the script's exit code.