Bisect for finding bug-introducing commits in Git - Mini Project: Build & Apply

Bisect for finding bug-introducing commits

📖 Scenario: You are working on a software project using Git. Suddenly, a bug appears in your code. You want to find out which commit introduced this bug so you can fix it quickly.

🎯 Goal: Learn how to use git bisect to find the commit that introduced a bug by marking commits as good or bad and letting Git narrow down the search.

📋 What You'll Learn

Use git bisect start to begin the bisect session

Mark a known bad commit with git bisect bad

Mark a known good commit with git bisect good <commit>

Use git bisect reset to end the bisect session

💡 Why This Matters

🌍 Real World

Finding the exact commit that introduced a bug helps developers fix problems faster and understand code changes better.

💼 Career

Software developers and DevOps engineers use git bisect to debug code efficiently in real projects.

1

Start bisect and mark the bad commit

Run git bisect start to begin the bisect session, then mark the current commit as bad using git bisect bad.

Git

# Run git bisect start and git bisect bad commands
# Your code here

Need a hint?

First, start bisecting with git bisect start. Then tell Git that the current commit has the bug with git bisect bad.

2

Mark a known good commit

Mark a known good commit where the bug was not present using git bisect good <commit-hash>. Use the commit hash abc1234 as the good commit.

Git

git bisect start

git bisect bad
# Mark the good commit with git bisect good abc1234
# Your code here

Need a hint?

Use the exact commit hash abc1234 with git bisect good to tell Git this commit is bug-free.

3

Test commits and mark them good or bad

After Git checks out a commit, test if the bug is present. Then mark the commit as bad with git bisect bad if the bug is there, or good with git bisect good if it is not. Write the command to mark the current commit as bad.

Git

git bisect start

git bisect bad

git bisect good abc1234
# Mark the current commit as bad or good after testing
# Your code here

Need a hint?

Use git bisect bad to mark the current commit as bad after testing.

4

Reset bisect after finding the bad commit

Once Git finds the first bad commit, end the bisect session by running git bisect reset.

Git

git bisect start

git bisect bad

git bisect good abc1234

git bisect bad
# Reset bisect session
# Your code here

Need a hint?

Use git bisect reset to stop bisecting and return to your original branch.