Description of problem:

I just tried to run preupgrade to upgrade my F12 x86_64 system to F14 x86_64. Our company has local mirrors of Fedora, Livna and Rpmfusion.

Ran preupgrade, it went and fetched package metadata, warned me about /boot not having enough space, and then continued to (supposedly) download packages.

Then, (clearly) without having downloaded anywhere near enough, I got to the "Completion" dialogue, where I was told preupgrade had downloaded everything it needed, and all I needed to do was reboot.

What it had _actually_ done, is look on our local mirror for Fedora 14 packages (we have _none_) not spot that there were none, and continue on like it had found repositories there, instead of what it actually found, '404' pages.

Version-Release number of selected component (if applicable):

preupgrade-1.1.8-1.fc12.1.noarch

How reproducible:

Always

Steps to Reproduce:
1. Configure a Fedora 12 machine for a local mirror that doesn't have F14 packages
2.Start a preupgrade to F14
  
Actual results:

The necessary packages are not downloaded

Expected results:

The user should either be told that the appropriate repositories cannot be found, or preupgrade should default to looking on the default mirror list to find packages. I'm not sure it can actually do this though, as the mirrorlist is only stored in the .repo files, and on our site the mirrorlist lines are commented out. They could just as easily have been deleted.

Additional info: