Hook

Add a pre-commit hook and make it executable.

What Is a Git Hook?

A Git hook is a script that runs automatically before or after specific Git operations. Hook files are located in the repository's .git/hooks directory. For example, a pre-commit hook runs before a commit is created and can perform formatting or simple validation checks.

.git/hooks/pre-commit

The hook file must have executable permissions.

Exercise Create a Pre-Commit Hook

Add a Bash script to .git/hooks/pre-commit. When the script runs, it should print Checking commit and return a successful exit code. Specify the Bash interpreter on the first line.

Show example solution

#!/bin/bash
echo "Checking commit"
exit 0

Exercise Make the Hook File Executable

Grant executable permission to the pre-commit file you created. Then use the ls -l command to inspect its permissions. The command sequence must perform the permission change first and the inspection second.

Show example solution

chmod +x .git/hooks/pre-commit
ls -l .git/hooks/pre-commit

Test yourself

Which hook runs immediately before a commit is created?
- post-merge
- pre-push
- pre-commit
- post-commit
Show answer

pre-commit — <code>pre-commit</code> runs before the commit operation is completed.

Make the Hook File Executable

chmod +x .git/hooks/pre-commit____

Show answer

chmod +x .git/hooks/pre-commit+x

Hook Concepts

pre-commit

Runs before a commit
post-commit

Runs after a commit
.git/hooks

Directory containing hook files
chmod +x

Grants executable permission

Next lesson: Advanced section exam

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