yum question, reverting to old packages.

[Naoki]

The docs don't mention anything about it but I'm wondering if yum can
handle this sort of functionality :

rpm -Uvh --oldpackage http://kickstart/blah/name

Right now it seems yum can install a specific version of a package, but
it can't 'rollback' to a version if that RPM is already installed.

I'm guessing that's pretty easy for yum to do so maybe it already can
and I'm missing something?
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