Satellite 5.7 Kickstart physicals with variable LUN IDs

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I'm trying to setup our new satellite 5.7 server to be my build server. Currently we create a modified kickstart file for every build, and include the LUN ID on the appropriate part lines:

part /boot --fstype ext4 --size=500 --ondisk=disk/by-id/scsi-3600601602640330000c45806df8ee511

part pv.01 --grow --size=1 --ondisk=disk/by-id/scsi-3600601602640330000c45806df8ee511

What I would like is to have a single kickstart in satellite that prompts for the LUN ID. This is what I tried so far.

In the %pre scripts:

iotty=tty
exec > $iotty 2> $iotty
echo -n "Enter the WWID of the boot LUN: "
read WWID
echo "WWID set to $WWID "
sleep 5
%end

This does successfully ask for the LUN ID.

I then modified the part lines like so:

part /boot --fstype ext4 --size=500 --ondisk=disk/by-id/scsi-$WWID
part pv.01 --grow --size=1 --ondisk=disk/by-id/scsi-$WWID

But it's not taking the WWID and inserting it there, because I'm getting an error saying it can't find the "/disk/by-id/scsi-$WWID". Is what I'm trying to do possible? Am I just going about this incorrectly? I'd love to see how others have solved this issue. All our physical builds are boot-from-san with multipathing, so I've gotta figure out a way to make this work.

am

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