![]() ![]() Because not only do we risk losing important data, but also repairing such a problem may stop work on a given project for some time. This can be a big problem for our company. So how can we deal with it? It is not that simple, especially when many people use our git repository at the same time. “In 2018, an experiment was conducted to search Github for withdrawn commits that contained the words “removed password” in the message. In my article about ransomware attacks on GitHub, Bitbucket, and GitLab I am describing a case that proves that such things happen in the real world: This is very dangerous because it gives the illusion that the password is no longer available in the git repository. Well, it will not be visible in the current version of code, in the current HEAD, but it will be stored in a git log. Git revert will also do nothing because my git commit will still be public and there is no need to write a commit message to the team. What’s next, any other subsequent commits? The quick git reset won’t work as it would ruin the commit history. I accidentally added this file to my current commit and I did a push. Suppose I had a password or other very important piece of information saved in the plaintext in the notes.txt file. Let us now consider a more difficult case. But these were only theoretical examples to learn any git command. We already know several ways to roll back changes, each has its own advantages and disadvantages. How to revert commit in git I have accidentally pushed critical data Visual learner? Then, don’t read but watch our GitProtect Academy video to find out how to undo a commit in git (Psst, don’t forget to subscribe!) Now, let’s go back to the main topic and find the answer to how to undo changes in git. To be more specific, we are getting into a dangerous area where you may end up with some lost data and work, so… be careful. There are a few basic tools (and rules too), but keep in mind that some of these operations can not be undone later. ![]() There may come a time when you will need to undo something – for instance, undo local commit, undo git restore, or undo changes in git. We’ll get an error when trying to push because Git doesn’t allow such tampering with history. This is important because when we ‘break’ such a sequence and the git log is not consistent, we will not be able to synchronize with an external repository. I’ve already mentioned that the history in Git is linear and that each specified commit has a parent. Git will allow us to do that, why not, but we should avoid such an operation ourselves. In such a situation there is no problem and we can safely perform this operation.īut what if we wanted to reset a git commit that already exists in the remote shared repository? Well, this is where it gets a little wild. Above, in the following example, we have considered the case where the latest commit B was only on our local repository. Tought, you need to know that such an operation has serious consequences. We also have to choose the flag (soft, mixed, hard), which determines whether the changes will be saved in our working directory or not. ![]() We can easily edit and remove this last commit with the git reset command operation. It turns out, however, that this feature is redundant (or wrong) and we don’t want to have it. Our linear story goes something like this: A - B. We’ve created a new feature, made our own commit B, but it’s still only local, we haven’t done a push yet. The last commit in the remote repository is A. Thus, any attempt to manipulate such a linear history can cause us trouble. Each git commit has a parent and its own unique SHA commit hash. Ok, we can branch the work, but it’s still linear. Another important thing, before we move on with our further consideration, is the fact that Git has a linear history. Those layers are important because rollback operations can work contrastingly for different levels.
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