git rebase interactive: squash merge commits together

Question

I wanted to have a simple solution to squash two merge commits together during an interactive rebase.

My repository looks like:

   X --- Y ---------          


        

Answer 1

I came to this topic wanting to squash a single merge commit; so my answer is not that useful to the original question.

               X
                \   
                 \  
a --- b --- c --- M1 (subtree merge)

What I wanted was to rebase the M1 merge and squash everything as a single commit on top of b.

a --- b --- S (include the changes from c, X and M1)

I tried all kinds of different combinations but this is what worked:

git checkout -b rebase b (checkout a working branch at point b)
git merge --squash M1

This will apply the changes into the index where they can be committed git commit