Build and Update the Yum Repository
From MediaWiki
Before building the ISO release image, you should make sure the NST yum repository is up to date and built for a ISO release.
The following will prune any old package builds and delta RPMs out of your repository and make sure the configuration files in the nst-release package are updated (these are the files that end up under the /etc/nst/iso/ directory). This can be done using the following command:
[nst@nst24-repo repo]$ svn update # To make sure you are in sync with your manifest commit [nst@nst24-repo repo]$ make release-repo-build