Undoing a git pull and it's effects on the history.

Question

Here is my sad story

Today I made the mistake of pulling from a different Repository into mine. I am working on Repository A and I pulled the contents of Repository B into A. I did it because I wanted some files from that Repository.

After that I pushed my repository to remote.

My problem is not my code because both repositories are different. But the problem is the history.

Now my remote Repository which can be seen by the public has all the history of commits from Repository B mixed with my commits in the log.

How can I remove those commits from the history LOG?

Is there a way to kinda reset my repository to it's state like yesterday ? Would that cause the commits from Repository B in my history to disappear ?

I tried to reset the Merge, Use Re-base and Cherry-pick but the history wasn't removed in either case.

Thanks for your time

Answer 1

Thank you everyone. I've solved my problem. I managed to solve it with reference to different articles and questions.

I will explain the answer here along with things I've learned through my struggle.

To begin with, in order to selectively remove commits from history that are scattered around the best way Can be found in the answer to this question:

Specifically the answer by Charles Bailey. The closest to this answer was Stuart.

Note: Reverting a commit doesn't remove it from history, Reset does.

As for my particular situation I thought I have to follow the previous method for every commit that I don't want but actually the answer was simpler.

In my situation I had to reset git to the commit just before I pulled Repository B and it has to be done for all branches. Once this is done all the undesired commits from B disappeared from my history.

Another Interesting thing to mention is that using git Cherry-Pick or Revert on many commits isn't as straight forward as it sounds from online articles, least for me.

Thank you everyone.

Answer 2

If you know where all of your branches were yesterday, you can go through and reset each of them to their original positions. For each relevant branch:

git checkout <branch name>
git reset --hard <old hash>
git push -f <repository A> <branch name>

You can then delete any new branches you don't want. For each such branch:

git branch -D <branch name>
git push <repository A> :<branch name>

This is all extremely sketchy if other people might have pulled from Repository A in the meantime though. The solution may be partly social as well as technical -- other people who are using the repository may need to be told what's going on so they can fix up their local clones.

Answer 3

git reflog is where you want to look. So long as you haven't garbage collected in a while, you should be able to do a git reset --hard HEAD@{x} with x being the specific point in history that you want to reset everything in your local branch back to.

As soon as you do that, I'd do a git push --force to put your public repo back to where you want it...

This has the unfortunate problems that if someone else has already pulled from your remote, their history will be messed up.