Let's talk about how to use Git to delete merge operations

During the development process, we usually use Git for version control. One of the operations is to merge branches. However, you may find problems with the merge during merge and require a rollback operation. If the rollback is not timely, unnecessary trouble will occur. Therefore, this article will introduce you how to use Git to delete merge operations.

1. Review the Git merge operation

When using Git for merge operations, the following instructions are usually used:

git merge <branch-name>

Among them, branch-name Indicates the name of the branch to be merged. When merging, if conflicts arise, they need to be resolved manually. However, after resolving the conflict, if there is a problem with the merged code, a rollback operation is required.

2. Rollback Git merge operation

There are generally two types of Git rollback operations: one is to use the revert command to roll back; the other is to use reset command to roll back. Among them, the revert command can retain the history record before the rollback, and the reset command will delete the history record before the rollback.

1. Use the revert command to roll back

After we perform the merge operation, if we find that there is a problem with the merged code, we can use revert Command to perform a rollback operation to restore the code to the state before the merge.

The syntax of the rollback operation is as follows:

git revert [-n] <commit-id>

Among them, the -n parameter indicates not to submit automatically; commit-id indicates that it is to be rolled back The commit ID of the merge operation. After executing this command, Git will automatically open an editor and ask you to write rollback commit information. When you're done editing, save and close the editor to commit the rollback. At this point, Git will automatically create a new commit and add the results of the rollback operation to the history.

It should be noted that if other commit operations are performed before the rollback, the commit ID of the rollback operation will change. At this time, you need to use the git log command to view the latest commit ID, and then use the revert command to roll back.

2. Use the reset command to roll back

When using the reset command to perform a rollback operation, you need to select the rollback mode. Git's rollback modes have the following three types:

• --soft mode: roll back to the specified commit, but do not delete the commit and subsequent modification records.
• --Mixed mode (default mode): Roll back to the specified submission, delete the submission and subsequent modification records, but do not delete the modification content.
• --hard mode: Roll back to the specified submission, delete all modification records and modifications after the submission.

The syntax of the rollback operation is as follows:

git reset [--soft | --mixed | --hard] <commit-id>

Among them, commit-id represents the commit ID of the merge operation to be rolled back. After executing this command, Git will delete all modification records and modifications after the rollback. It should be noted that after using the reset command to roll back the operation, the history before the rollback will not be restored. Therefore, careful consideration is required when performing rollback operations.

3. Summary

Git is an important tool for version control, and the merge operation is also one of the commonly used operations in Git. However, when performing the merge operation, you may find that there is a problem with the merged code, and you need to perform a rollback operation. This article introduces how to use Git's revert and reset commands to perform rollback operations. I hope it will be helpful to everyone in the use of Git.

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