I've had previously working "mock" setups for RHEL 5.0, but I've moved
to a new environment and need a new build setup, on an isolated
subnet. I've got:

* A clean RHEL 5.1 server.
* A separate /var/lib/mock partition, to segment off potential
partition overflows
* A local mirror of http://buildsys.fedoraproject.org/buildgroups/
* A DVD image unfolded at the website http://repomirror/pub/DVD/rhel-5.1-server-i386-dvd/
* A local reposync mirror of RHEL's updates.

I'm not sure whether to use the CentOS extras versionof mock,
RPMforge, or EPEL. And I'm not sure whether I should just point my
RHEL 5 config file to the DVD image first as the base OS, or to the
local reposync mirror and use that as the sole source of packages.

Does anyone have a workiing RHEL 5 mock setup, with the particular
mock version number and an RHEL config file?