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Learn how to ensure a clean Git merge without auto-merging issues by disabling auto-merge when squashing commits.
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This video is based on the question https://stackoverflow.com/q/64627986/ asked by the user 'Jerem Lachkar' ( https://stackoverflow.com/u/4508962/ ) and on the answer https://stackoverflow.com/a/64628193/ provided by the user 'Jerem Lachkar' ( https://stackoverflow.com/u/4508962/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Mastering Git Merges: Disable Auto-Merge with Squash

When managing a Git repository, particularly when working with multiple branches like dev and master, it’s crucial to maintain a clean and meaningful commit history. Many developers face challenges while merging changes, especially when they want to merge branches without retaining the intricate details of technical changes. One common scenario is using git merge with --squash, but sometimes that leads to unwanted auto-merges that can introduce errors into your codebase.

In this guide, we'll explore how to successfully perform a merge that aligns with your project's workflow while disabling auto-merge features.

Understanding the Workflow

Before we tackle the solution, it's important to clarify the desired workflow:

Branch Structure: You have two main branches – dev for technical changes and master for release versions.

Commit History: When merging dev into master, you aim to create a clean history, showcasing only significant release markers such as [PROD V1] and [PROD V2].

To achieve this clean history, the following command is generally used:

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

However, you’ve encountered issues with auto-merges that can lead to duplicate code blocks and other errors in your scripts. This article will guide you through effectively avoiding those pitfalls.

The Problem with Auto-Merging

When using the -X theirs option, you might assume that Git replaces entire files with their version. However, this is misleading. Git is not simply a replacement tool; rather, the -X theirs parameter is designed to resolve specific conflicts by favoring the changes from the dev branch, but only when Git cannot automatically merge changes.

This often leads to unintended auto-merges, which may duplicate code or create conflicts that were not meant to happen.

The Solution: Disabling Auto-Merge

To ensure that each file in your master branch is replaced entirely by the corresponding file in the dev branch, follow these revised steps:

Perform the Squash Merge:
Start your merge without resolving conflicts automatically:

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

Git will stage the changes from dev without committing them yet.

Replace with Their Version:
Instead of relying on automatic merging, explicitly check out the version from the dev branch for all files:

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

This command replaces the contents of the files in your working directory with those from the dev branch.

Mark Conflicts as Resolved:
After you’ve checked out the desired versions, you will need to mark all files as resolved:

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

This step tells Git that you have resolved any conflicts and are ready to proceed.

Commit Your Changes:
Finally, create a single commit with a meaningful message to represent the release:

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

Push to Remote Repository:
Push your changes to ensure that the master branch is updated:

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

Conclusion

By following this structured approach, you can effectively manage your Git branches and avoid the pitfalls of unwanted auto-merging. This not only helps in maintaining a clean commit history but also enhances the overall stability and readability of your codebase.

Now, you can confidently merge your branches without the fear of merging errors or duplications. Happy coding!