Скачать или смотреть How to Easily Run git bisect with Patches on Top Cleanly

Discover the best techniques to effectively use `git bisect` with patches and solve common conflicts easily.
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This video is based on the question https://stackoverflow.com/q/70027753/ asked by the user 'Dan Scally' ( https://stackoverflow.com/u/2739654/ ) and on the answer https://stackoverflow.com/a/70028096/ provided by the user 'jthill' ( https://stackoverflow.com/u/1290731/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Simplifying git bisect with Patch Management

When working with Git, one of the most powerful features is the ability to identify problematic commits swiftly using git bisect. However, a common challenge arises when the issue isn’t clear without additional patches. If you often find yourself struggling to apply patches cleanly while bisecting your commits, you’re in the right place. In this post, we'll explore how to run git bisect effectively, especially when incorporating patches.

The Problem with git bisect

The essence of git bisect lies in its binary search algorithm that helps you find a specific commit that introduced a bug. The typical workflow involves marking a good commit and a bad one, and Git helps you determine where the issue began. However, in scenarios where you need patches from another branch, applying those patches can lead to complications, especially when:

Merging conflicts occur during the cherry-pick process.

You’re unable to continue the bisect after resolving conflicts.

Common Scenarios Encountered

Conflict Errors: When applying a patch, conflicts can arise preventing Git from moving forward.

Failure to Continue: After resolving conflicts, running git cherry-pick --continue may prompt unexpected errors indicating that your local changes would be overwritten.

Solution: A Streamlined Approach to git bisect with Patches

Instead of applying patches one by one with iterative cherry-pick commands, you can streamline the process significantly with a batch application approach. Here’s a detailed breakdown of how to do this effectively:

1. Batch Apply Patches

Instead of cherry-picking commits individually, use the diff and apply commands to handle all patches at once. Run the following command:

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This command generates the diff between the two commits and applies it while attempting three-way merges, helping to reduce manual merge conflicts.

2. Fix Any Merge Conflicts

After executing the above command, if there are merge conflicts:

Resolve the issues in your files as usual.

Once all conflicts are resolved, add the corrected files with:

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

3. Execute the Test

With the conflicts resolved and the changes staged, you can now run your tests to check if the bisected version works correctly.

4. Taking Advantage of Git’s Rerere Feature

To automate conflict resolution in the future, consider utilizing Git's rerere (reuse recorded resolution) feature. Here’s how to enable it:

Create the Rerere Cache:

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Track Conflicts:

Once you encounter conflicts, run:

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

After resolving conflicts for the first time, repeat the git rerere command after staging your resolutions.

Using rerere allows you to skip repetitive manual resolutions for similar conflicts in the future, saving time and reducing errors.

Conclusion

With these techniques, running git bisect with patches does not have to be a headache. By applying patches in batches and utilizing tools like rerere, you can streamline your Git workflow, making it more efficient and less error-prone. Happy coding, and may you find those pesky bugs with ease!