Upgrading from < 8.1 with users and groups with same name

Hi PostgreSQL developers!

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.

My current solution checks for this situation and aborts the upgrade
if there is at least one name which is both an user and a group (and
asks for renaming either before attempting the upgrade again).

For an upstream solution, maybe pg_dumpall should detect this
situation and abort with an error?

Thank you in advance for any idea,

Martin

[1] http://bugs.debian.org/343622

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Martin Pitt        http://www.piware.de
Ubuntu Developer   http://www.ubuntu.com
Debian Developer   http://www.debian.org

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