I am trying to compare the difference between two repositories at given commits. The closest StackOverflow post that I've come across suggests adding one repo as a remote to compare with the working repo with below commands:
git remote add -f b path/to/repo_b.git
git remote update
git diff master remotes/b/master
git remote rm b
However, if I want to compare with the point at a specific past commit of the repo_b (and not just a branch), how can I do that?
Just use the commit hashes instead of the branch names in git diff. For example:
git remote add -f b path/to/repo_b.git
git remote update
git diff 547cd49 600cd49
git remote rm b
Commit hashes are unique over branches (and universe)