How to “git show” a merge commit with combined diff output even when every changed file agrees with one of the parents?

Question

After doing a \"simple\" merge (one without conflicts), git show usually only shows something like

commit 0e1329e551a5700614a2a34d8101e92fd9f2ca         


        

Answer 1

Seems like answered here: https://public-inbox.org/git/7vd392ezhx.fsf@alter.siamese.dyndns.org/

So in a similar way, running

$ git diff --cc $M $M^1 $M^2 $(git merge-base $M^1 $M^2)

should show a combined patch that explains the state at $M relative to the states recorded in its parents and the merge base.

Answer 2

I built a general-purpose approach to doing various operations on a merge's commits.

Step One: Add an alias to git by editing ~/.gitconfig:

[alias]
  range = "!. ~/.githelpers && run_on_merge_range"

Step Two: In ~/.githelpers, define a bash function:

run_on_merge_range() {
  cmd=$1; shift
  commit=$1; shift
  range=$(git show $commit | grep Merge: | awk '{print $2 "..." $3}')
  echo "git $cmd $range $@"
  if [ -z $range ]; then
    echo "No merge detected"
    exit 1
  fi
  git $cmd $range $@
}

Step Three: Profit!

git range log <merge SHA> --oneline
git range diff <merge SHA> --reverse -p
git range diff <merge SHA> --name-only

There is probably a LOT of room for improvement here, I just whipped this together to get past an annoying situation. Feel free to mock my bash syntax and/or logic.

Answer 3

in your case you just need to

git diff HEAD^ HEAD^2

or just hash for you commit:

git diff 0e1329e55^ 0e1329e55^2

Answer 4

You can create branch with HEAD set to one commit before merge. Then, you can do:

git merge --squash testing

This will merge, but not commit. Then:

git diff

Answer 5

If your merge commit is commit 0e1329e5, as above, you can get the diff that was contained in this merge by:

git diff 0e1329e5^..0e1329e5

I hope this helps!

Answer 6

If you are sitting at the merge commit then this shows the diffs:

git diff HEAD~1..HEAD

If you're not at the merge commit then just replace HEAD with the merge commit. This method seems like the simplest and most intuitive.