Large chunks of updaterpms were written after reverse-engineering RedHat's
"rpm",  "rpmlib" and the installation code for RedHat 5.2 and 6.2. 

There's quite likely some other snippets of code that were first written
by Paul Anderson <paul@dcs.ed.ac.uk> and/or George Ross <gdmr@dcs.ed.ac.uk>

Andras.Nagy@cern.ch contributed a patch to extend the rpmcfg file format
(/arch) so that one can specify a particular architecture for an RPM.