![]() If you examine the log of a rebased branch, it looks like a linear history: it appears that all the work happened in series, even when it originally happened in parallel. There is no difference in the end product of the integration, but rebasing makes for a cleaner history. Now, the snapshot pointed to by C3' is exactly the same as the one that was pointed to by C5 in the merge example. Rebasing the change introduced in C3 onto C4.Īt this point, you can go back to the master branch and do a fast-forward merge (see Figure 3-30).įigure 3-30. Figure 3-29 illustrates this process.įigure 3-29. It works by going to the common ancestor of the two branches (the one you’re on and the one you’re rebasing onto), getting the diff introduced by each commit of the branch you’re on, saving those diffs to temporary files, resetting the current branch to the same commit as the branch you are rebasing onto, and finally applying each change in turn. In this example, you’d run the following: $ git checkout experimentįirst, rewinding head to replay your work on top of it. With the rebase command, you can take all the changes that were committed on one branch and replay them on another one. However, there is another way: you can take the patch of the change that was introduced in C3 and reapply it on top of C4. Merging a branch to integrate the diverged work history. It performs a three-way merge between the two latest branch snapshots (C3 and C4) and the most recent common ancestor of the two (C2), creating a new snapshot (and commit), as shown in Figure 3-28.įigure 3-28. The easiest way to integrate the branches, as we’ve already covered, is the merge command. If you go back to an earlier example from the Merge section (see Figure 3-27), you can see that you diverged your work and made commits on two different branches.įigure 3-27. In this section you’ll learn what rebasing is, how to do it, why it’s a pretty amazing tool, and in what cases you won’t want to use it. Other developers are likely to be looking at your commits, which means that those changes are on a public branch, even if they're not on the master branch.In Git, there are two main ways to integrate changes from one branch into another: the merge and the rebase. Or at least, don't use rebase after creating the pull request. Likewise, if pull requests form part of your code reviews, don't use rebase. If your project has multiple contributors, the safe thing to do is only use rebase on your local repository, and not on public branches. Your changes to your repository are going to cause problems to a lot of people when you push your rebased code to your remote repository. That would restore your master branch, albeit with an odd-looking history.ĭon't use rebase on shared branches where others are likely to work. To get your master branch back, you'd need to rebase again, this time from your new-feature branch to your master branch. You could still rebase in the wrong direction for example, and rebase your master branch onto your new-feature branch. If you're the only developer using a repository, there's less chance of you doing something with rebase that is disastrous. ![]() This stops the work done in branches from messing up the master branch, and it allows simultaneous development to happen in different parts of the code base. Development, such as new features, takes place in segregated side branches. This is where the project's code base sits. A project repository will have a main or master branch. Branches are a fundamental part of version control systems. In particular, working with branches had to be as fast as possible. One of Git's main design decisions was speed. Today Git is used globally, with a massive 98 percent of 71 thousand respondents in a 2022 survey using Git as the version control system. Sites like GitHub, GitLab, and BitBucket have symbiotically promoted and benefited from Git. The Git Explosionįrustrated with other version control systems and their slow updates and commits, Linus Torvalds, of Linux kernel fame, put aside a month in 2005 to write his own. We explain what rebase does, how it's used, and when to use merge instead. The Git rebase command combines two source code branches into one.
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