I make my distribution RPMs available on an NFS export, which is exported read-only in order to
preserve the integrity of the distributions. When UMLBuilder tries to write its index file, it complains
about not being able to write the index, does some more work, and then just stops.
It'd be nice if, in the case of a read-only RPM dir, it'd offer a dialog asking where the user would like
the index to be saved.