This assumes that changes to content in bare repos are made from some
non-bare repo, and that the location log is updated on that side.
That's true for move --from and move --to.
It's *not* true for dropkey and setkey and recvkey. But those are plumbing
level commands, so I guess it's ok to assume that someone running those
in a bare repo knows what they're doing. And git-annex-shell is used to
run those, and if the bare repo is non-local, it needs to be able to use
them even though they cannot update the location log. So this seems
unavoidable.
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