pre-commit hook in Git - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a pre-commit hook script that runs before a commit.

Git

#!/bin/sh

[1]

Drag options to blanks, or click blank then click option'

Aecho "Running pre-commit checks..."

Bgit commit -m 'auto commit'

Cgit push origin main

Drm -rf /

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to run git commit inside the pre-commit hook causes recursion.

Using destructive commands like rm in the hook.

The pre-commit hook script should start by printing a message to indicate it is running checks before the commit.

2fill in blank

medium

Complete the code to prevent a commit if a Python file contains syntax errors.

Git

for file in $(git diff --cached --name-only --diff-filter=ACM | grep '\.py$'); do
  python -m py_compile $[1] || exit 1
 done

Drag options to blanks, or click blank then click option'

Afilename

Bfiles

Cfile

Dfilepath

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable name not defined in the loop.

Forgetting to exit with code 1 to stop the commit.

The variable file holds the filename in the loop and is used to check syntax.

3fill in blank

hard

Fix the error in the pre-commit hook that tries to run tests but fails due to wrong command.

Git

echo "Running tests..."
[1]
if [ $? -ne 0 ]; then
  echo "Tests failed, aborting commit."
  exit 1
fi

Drag options to blanks, or click blank then click option'

Anpm test

Bnpm tests

Cnpm testing

Dnpm run test

Attempts:

3 left

💡 Hint

Common Mistakes

Using npm test which may work but is less explicit.

Using commands that do not exist like npm tests.

The correct command to run tests with npm is npm run test.

4fill in blank

hard

Fill both blanks to create a pre-commit hook that checks for trailing whitespace and aborts commit if found.

Git

if git diff --cached --check | grep [1]; then
  echo "Trailing whitespace found in [2]. Commit aborted."
  exit 1
fi

Drag options to blanks, or click blank then click option'

A--quiet

B--cached

Cfiles

Dstaged files

Attempts:

3 left

💡 Hint

Common Mistakes

Using grep without options prints lines but does not help conditionally.

Referring to unstaged files instead of staged files.

The --quiet option makes grep silent but returns status. The message refers to staged files where the whitespace was found.

5fill in blank

hard

Fill all three blanks to create a pre-commit hook that formats Python files with black and adds them back to staging.

Git

for file in $(git diff --cached --name-only --diff-filter=ACM | grep '\.py$'); do
  black [1]
  git add [2]
done

exit [3]

Drag options to blanks, or click blank then click option'

A$file

Bfile

C0

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the $ before the variable name.

Exiting with 1 which aborts the commit even if formatting succeeded.

The variable $file is used to format and add each Python file. The script exits with 0 to allow the commit.