[CentOS] OT - Automated rpm builds

Hi

Currently devs check code into perforce and we have to checkout > 
package > update repo > deploy

I know this could be scripted but are there any tools out there that can 
take code from a repository and build rpm's in a continuous integration 
type manner? I have been hunting around for such a tool and so far not 
seeing anything obvious as i dont want to reinvent the wheel if at all 
possible.

thanks