Joey Hess wrote: > with the old ref I saw on the remote. If the shas are different, I > check `git log --oneline $old..$src` -- if this outputs nothing, then > history is not advancing and it refuses to push that ref, and > reports the error to git.
That's not quite right, because git log outputs commits when the two refs are diverged but share a common ancestor. I think the best way to detect it is git merge-base --ancestor $old $src which will exit nonzero on a non-fast-forward. -- see shy jo
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