Accessing CDROM in POST section

[GRIGG, Stuart]

Does anyone know how to access the cdrom in the post install section of the
kickstart file.
 
I dumped out /proc/mounts in the post section and I can see that the CDROM
is mounted as follows
/tmp/cdrom  /mnt/source iso9660 ro 0 0 
 
But from the post section I cannot access /mnt/source (source directory does
not exist)
 
I am using RedHat 7.3 with all the updates applied (custom DVD)
 
Any help appreciated.