Re: BUG: git pull --rebase on detatched head prints a lot of usage warnings

Santi Béjar [off-list ref] writes:

No, I'm not sure. In fact the documentation explicit says that they
are different. But I fail to see when it matters, and more
specifically (now that I've reread the docs), what is the point of
"merge-base A B C".

See c5dc9a2 (git-merge-octopus: use (merge-base A (merge B C D E...)) for
stepwise merge, 2008-07-27), not the patch but the explanation.

Just a data point, show-branch --merge-base is only used once in the
code, in git-pull.sh, but "git merge-base A B C" is not used (at least
using my grep).

Your grep skill needs honing ;-)  The variable MRC in git-merge-octopus is
a space separated list of commit object names, split at $IFS when
merge-base is called.