Yum broke in transaction, how to restore system?

[Linus Walleij]

I had yum breaking in the middle of a transaction yesterday (kernel post 
scriptlet failed) so now some packages were installed but no "clean up" 
was done.

Is there some archaic way of resolving this and run just the cleanups 
post-mortem? I never understood this quite, and yum manpage is not very 
helpful to unexpected situations...

Actually this happening so seldom is an indication of how good yum 
actually is, so me not knowing the answer already is a GoodThing(TM).

Linus