[Users] set domain credentials to be used during sysprep joining an AD domain.

i'm having trouble finding how set the domain user credentials used when joing a computer to an AD domain using sysprep. i've found where ovirt stores the windows product keys, and the settings in engine-config, but i don't see anything about the domain user credentials. Do I need to replace the domain user variables in sysprep.w7 and statically set them to what I need?