Скачать или смотреть How to Quickly Find the LAST GOOD COMMIT with Git Bisect

Discover a quick and efficient method to identify the `LAST GOOD COMMIT` when using git bisect to diagnose issues in your codebase.
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This video is based on the question https://stackoverflow.com/q/66266743/ asked by the user 'JL Peyret' ( https://stackoverflow.com/u/1394353/ ) and on the answer https://stackoverflow.com/a/66269590/ provided by the user 'chepner' ( https://stackoverflow.com/u/1126841/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Git Bisect: Finding the Last Good Commit Quickly

Working with Git can sometimes feel overwhelming, especially when you're trying to diagnose issues in your code. One powerful feature that helps identify problematic commits is Git bisect. However, a common question many developers face is how to quickly find the LAST GOOD COMMIT after identifying the first bad commit. Let's break down this problem and explore an efficient solution.

The Problem

You're using Git bisect to find which commit introduced a bug. You've successfully located the first bad commit, but now you want to find the LAST GOOD COMMIT without having to manually sift through the commit history. This can be tedious and time-consuming, especially in large projects with many commits.

For example, after running git bisect good, you may find output like this:

[[See Video to Reveal this Text or Code Snippet]]

Your goal is to quickly retrieve the commit hash of the preceding commit, which is the LAST GOOD COMMIT (in this example, it might be 8993de6cc8bac3d5867e6b84fe30c52c9e604737).

The Solution: Finding the Last Good Commit

To efficiently identify the LAST GOOD COMMIT, you can use a simple Git command to grab the parent commit of the first bad commit. Here’s how:

Steps to Find the Last Good Commit

Identify the First Bad Commit: After running your bisect commands, note down the hash of the first bad commit. For instance, it’s 2060c40f6c3d3c057f9fdab31643599da375296b in our example.

Use Git Show Command: To get the parent commit (which represents the LAST GOOD COMMIT), you can use the following command:

[[See Video to Reveal this Text or Code Snippet]]

Here, ^ signifies the parent of the specified commit. The command retrieves the commit info and head -1 ensures you only get the most relevant information directly.

Check the Results: After running the command, you should see details that represent the LAST GOOD COMMIT, including the commit hash, author, and date.

Why This Works

The parent commit of a "bad" commit is usually a "good" commit, meaning it was the last known stable version of your code before the issue was introduced. By directly referencing the parent commit, you cut down on the need for manual inspection or broader git log commands that can give you overwhelming results.

Conclusion

Using the git show command with the ^ notation allows you to swiftly determine the LAST GOOD COMMIT, saving you time and streamlining your debugging process in Git. This simple yet effective approach leverages the power of Git's commit history to help keep your development workflow efficient.

If you ever find yourself needing to perform a Git bisect, remember this technique to quickly pinpoint your last stable state in the repository. Happy coding!