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How do I undo or abort a merge in GIT?

+2 votes
370 views

I am learning, and experimenting. I was experimenting with "git merge", forgot the "--no-commit", and discovered the hard way that aborting the editor that comes up without saving does NOT abort the merge.

And git merge --abort fails, because the merge succeeded.

Git Gui has a way to amend the comment of the last merge, but no way to undo it. I figure this should be simple, but I don't know how.

posted Feb 23, 2015 by Satish Mishra

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1 Answer

+1 vote

One way to do that :
- look up the hash of the commit you want to go back to, let's say it's 'abc1234'
- run git reset --hard abc1234.

answer Feb 23, 2015 by Arjuna
Similar Questions
+2 votes

I am getting some unexpected results from a merge and I'd like to understand why.

I have two commits X and Y that I want to merge.

git merge-base X Y # yields B
git diff B X -- F # is empty
git diff B Y -- F # contains the change I want merged
git rev-list X ^B -- F # is empty
git rev-list Y ^B -- F # contains one commit

git checkout X
git merge Y

fails with fixable merge conflicts on other files, but uses X's copy of F instead of Y's. I was expecting it to use Y's copy of F, since only Y has modified F since B. What could cause this?

+2 votes

I tend to accumulate lots of branches as I'd do one branch per feature. When cleaning up, I'd like to
delete all branches, which have been merged.

I could use

 $ git branch -d (which was merged already?) ^C
 $ git branch --merged # let's find out
 ...
 $ # Now run git branch -d with each of the branches.

This kind of question has already been discussed,
http://stackoverflow.com/questions/6127328/how-can-i-delete-all-git-branches-which-are-already-merged
suggests: git branch --merged | grep -v "*" | xargs -n 1 git branch -d

I could think of:

 $ git branch -d --merged # no need to specifiy a branch iff --merged is given with -d
 $ git branch --delete-merged # comes as an new extra option, doesn't clutter other commands
 $ git branch -d keyword-for-all-merged-branches

Before starting such a feature, I'd like to hear input of others.

+2 votes

Let's say I have two identical branches: master and topic. In master I remove some code, i.e. function bar(). In topic I do the same (commit) and after some time I realize I need bar() and revert previous commit
with removal.

So I end with master with no bar() and topic with bar() in its original state. When I merge I get code without bar() and no merge conflict (recursive or resolve strategies). Is it possible to detect such situations as conflicts? When bar() is C++ virtual there is no possibility to catch this with compiler.

+1 vote

My most recent commit was the creation of a tag. I want to delete that tag. Should I reverse merge the commit or simply delete the tag?

If I do a reverse merge I see a tree conflict:

C:>svn merge -c -69  

--- Reverse-merging r69 into '.': 

 C tagsTAG_ 

--- Recording mergeinfo for reverse merge of r69 into '.': 

U . 

Tree conflict on 'tagsTAG_ 

 > local dir edit, incoming dir delete upon merge 

Select: (r) mark resolved, (p) postpone, (q) quit resolution, (h) help: 

What is the best thing to do here?

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