How do you see / show a git merge conflict resolution that was done, given a merge commit SHA1?

Question

When you resolve a conflict, then stage the changes, then do a git diff, it shows you two columns of +'s and -'s, one for "ours" and one for "theirs". Given a merge commit in a repo's git history, how do I see that resolution, which was done by someone else? In other instances, I've seen it before (in gitk, I think), but I can't seem to determine it for this SHA1 that I have.

Answer 1

If you know the ref, then git show <MERGE_COMMIT> will show you the resolution done (if any) for the merge commit.

For log, use git log -p -c or git log -p --cc. From the manpage of git log:

   -c
       With this option, diff output for a merge commit shows the differences from each 
       of the parents to the merge result simultaneously instead of showing pairwise 
       diff between a parent and the result one at a time. Furthermore, it lists only 
       files which were modified from all parents.

   --cc
       This flag implies the -c option and further compresses the patch output by 
       omitting uninteresting hunks whose contents in the parents have only two 
       variants and the merge result picks one of them without modification.

Answer 2

Slight bikeshed: you could use diff3 or kdiff3 to see the merge in reverse, particularly if it was a (git style) 'evil' merge, where a secondary change was introduced to resolve the conflict. (watch out for an exploding head trying to see how it 'backs out' the changes;-)

Obviously the 'base' commit would be the merged commit.