Kickstart snippet to avoid installing on wrong hard drive (or wiping your USB stick)

root-disk-selection.ks

%pre
MIN_SIZE=100
MAX_SIZE=600

rootdisk=
for dev in sd vd xvd ; do
  for drive in a b c d ; do
    bdev="/sys/block/${dev}${drive}"
    if [ -z "${rootdisk}" ]; then
      if [ -d "${bdev}" ] && [ "$(cat ${bdev}/removable)" == "0" ]; then
        devsize=$(($(cat ${bdev}/size)/2**21))
        if [ "${devsize}" -gt ${MIN_SIZE} ] && [ "${devsize}" -lt ${MAX_SIZE} ]; then
          rootdisk="${dev}${drive}"
        fi
      fi
    fi
  done
done

cat <<EOF>>/tmp/drive-selection
bootloader --location=mbr --driveorder=${rootdisk} --append="crashkernel=auto"
clearpart --drives=${rootdisk} --all --initlabel
zerombr yes
part /boot --fstype=ext4 --size=1024 --ondisk=${rootdisk}
part swap --size=16384 --ondisk=${rootdisk}
part pv.253003 --grow --size=200 --ondisk=${rootdisk}
EOF
%end

%include /tmp/drive-selection

Thanks, this was very useful :)