Creating custom hook scripts in Git - Practice Exercises

Challenge - 5 Problems

💻 Command Output

intermediate

Output of a pre-commit hook script

You have a pre-commit hook script that checks for TODO comments in staged files. What will be the output if a staged file contains a TODO comment?

Git

#!/bin/sh
if git diff --cached | grep -q 'TODO'; then
  echo "Commit blocked: TODO comments found."
  exit 1
fi
exit 0

A Commit successful with TODO comments.

B Syntax error in hook script.

C No output, commit proceeds.

D Commit blocked: TODO comments found.

💡 Hint

The script blocks commits if TODO comments are detected in staged changes.

The script searches staged changes for 'TODO'. If found, it prints a message and exits with status 1, blocking the commit.

🧠 Conceptual

intermediate

Purpose of Git hook scripts

What is the primary purpose of creating custom Git hook scripts?

A To automate tasks during Git events like commit or push.

B To change the Git repository URL.

C To increase the size of the Git repository.

D To create new branches automatically.

💡 Hint

Think about what happens automatically when you commit or push.

Git hooks run scripts automatically on certain Git events to automate checks or tasks.

❓ Configuration

advanced

Correct placement of a custom Git hook script

Where should you place a custom hook script named 'pre-push' to ensure Git runs it before pushing?

A .git/hooks/pre-push

B .git/pre-push

C hooks/pre-push

D pre-push/.git/hooks

💡 Hint

Git looks for hooks inside a specific directory within the repository.

Git hook scripts must be placed inside the .git/hooks directory with the exact hook name.

❓ Troubleshoot

advanced

Why a Git hook script is not running

You created a 'post-commit' hook script but it does not run after commits. What is the most likely reason?

A Git does not support post-commit hooks.

B The script is placed in the wrong directory.

C The script file is not executable.

D The repository is not initialized.

💡 Hint

Git requires hook scripts to have execute permissions.

If the hook script is not executable, Git will ignore it and not run it.

🔀 Workflow

expert

Sequence of Git hook scripts during a commit

What is the correct order of Git hook scripts triggered during a commit?

A 1,2,3,4

B 2,1,3,4

C 2,3,1,4

D 1,3,2,4

💡 Hint

Some hooks run before the commit message is prepared.

The order is: prepare-commit-msg, pre-commit, commit-msg, then post-commit.