Martin Pitt <martin@piware.de> writes:
> I recently got a rather interesting Debian bug [1]: When upgrading a
> pre-8.1 database to 8.1, the upgrade messes up permissions if the old
> database had users and groups with the same name. Since in 8.1 they
> get collapsed to a 'role' there will be a name clash.

I think the only real problem here is that the role ends up with
NOLOGIN set, which we could probably fix by reordering the commands;
but of course we can't do anything about dumps made with existing
versions of pg_dump.

> My current solution checks for this situation and aborts the upgrade

That seems like serious overkill.

regards, tom lane

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