Linux Kickstart %pre script Disk Partitioning

We are looking for someone to help us write a kickstart %pre script in bash that will grab the list of drives on a server , order them by size , taking the smallest drive and setting it as a variable. We are ope to other ways of doing this in the kickstart. We simple need the smallest size drive with the highest alphabetical drive letter to be a variable that we can use to put into partitioning layout