9/12/2023 0 Comments Git rebase vs pullWhat will happen during a Git rebase is that the commits you want to add to the codebase are replayed on top of the target branch. This is where things start to get a bit scary, because it involves rewriting history due to force pushing. As you can see, there are a lot of reasons for a rebase. Or your code hooks into new code that is now added in the target branch. Another reason might be that you have just opened the PR at a time where the tests or build were in a bad state. On the Xamarin.Forms repository we might ask you to do a rebase whenever there are conflicts. That will however give a lot of merge commits and isn’t very clean. What you could do is merge the changes from the target branch into your PR branch. These are conflicts between your code changes in the PR and other changes that got merged into the target branch. ![]() Meanwhile, development goes on and the branch you are targeting with your PR gets updated. Unfortunately reality is that your PR might be sitting there for a while. You have gathered the courage to open that PR and hope it will get merged soon. ![]() The Backstory #įinally, your change is ready for the world to see. So where it says master in the screenshots, you can substitute that for main. Before closing the editor please take a quick look on the available commands, maybe you’ll need them in future, just good to know.Note! In the screenshots the branch is named master I have updated the text to now use main. So i’m replacing the pick of the commit by reword and save the file. In this case my commit just needs a new message so i can sign it off. Then you need to pick only your commits and delete all of the other commits to ensure your branch only contains your changes. If the latter is the case you had a merge conflict or somehow messed up your history (usually by merging things). You will get an editor listing all your commits and hopefully no commits of other people. This can be done doing an interactive rebase using following command: git rebase -i upstream/main Rebasing is potentially destructive, so make sure you have a backup.Īs my commit message is broken, i’ll need to change it also. This changes the history as my change was added before i’ve merged. To fix our issue, my changes have to be applied at the last position. What does rebasing mean? Git is primarily just a collection of diffs with descriptions where the order matters. One solution would be to create a new fork, but that’s somehow cumbersome, let’s do it right. It’s required to base our changes on the current main. So the DCO-check at github when doing a Pull Request will block it. And now i’ve seen i did not sign off my commit. That is bad, as i don’t want to be responsible for changes of other people. ![]() They are part of the commit history after (!) the repository was forked and are in that case also part of the future pull request. Okay, at least the official changes are now also in my branch. It contains any changes that happened since i forked from main and is now part of my branch. Okay, another commit was made, a merge commit. However this is enough to demonstrate how to do things. It consists just in an edit of the README. In my example i’ve made a change in my existing binding. Do not use them if you have not done the same actions in command line once. There are many GUIs there which should help you, but they hide the complexity you need to understand to not break the history. Okay let’s begin.įirst of all: make sure to get a proper Terminal (Unixes do have usually a good one integrated, Windows Users should take a look on the Windows Terminal) and git setup. Best thing to solve this, is to rebase your code changes on the current main branch. If you don’t rebase or merge the right way, you may create unintentional changes in other modules you did not even touch. This is necessary to get a proper history as the openHAB project with many contributors. As git is not easy to handle for new contributors and often first time contributors having trouble with branches here is a guide how to rebase your contribution before creating a pull request.
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