kickstart fails when mounting partitions in "%pre" script on Red Hat Enterprise Linux 5.5

Issue

• kickstart fails when using follwing "%pre" script.

  for part in `fdisk -l | grep -i Linux | egrep -iv "swap|raid" | awk '{print $1}' | sort`
  do
      echo -e "${blue}  Trying to rescue data from $part${gray}"
      mkdir -p /tmp/probedisk
      mount -o ro $part /tmp/probedisk
      umount /tmp/probedisk
      rmdir /tmp/probedisk
  done