rpm --force --upgrade seems to be leaving old files around. See #580 for an example of the mess it can make.
Ronald has some good suggestions though:
The best would be bump the rpm version (not the base version) each time. But we wan't to avoid having to check in a file every time something builds an rpm... A timestamp would be great here.
Hmm, CodehausJira:MNG-1832 had a patch to add this to maven. Sigh, they of course closed this and refuse to apply the patch, referring to non-existent plugins instead. This here has something: CodehausJira:MNG-719 - maybe we can take that and create a own simple plugin to create a timestamp variable which we can then use in the pom.
