Comment # 19 on bug 1041742 from Michael Andres

- Without fixing rpm, %transfiletrigger* will not be executed because
--noposttrans also disables the %transfiletrigger in rpm. 

- Even if rpm would be fixed and would execute %transfiletrigger, they will
behave the same way as if you use ordinary %filetrigger* due to the way we use
rpm.

Workaround could be to use %filetrigger to touch some indicator file and a
posttrans rebuilding the cache if the indicator file exists. This should work
no matter if rpm gets fixed or not.