#!/bin/bash

scan_for_lvp() {
	unset lvp_drives
	num_found=0

	for x in /dev/cdroms/* ; do
		if mount -n ${x} /mnt >/dev/null 2>&1 ; then
			if grep -q LVP /mnt/etc/VERSION ; then
				lvp_drives="${lvp_drives} ${x}"
				num_found=$(( ${num_found} + 1 ))
			fi
			umount /mnt
		fi
	done
}

if [ ! -e /dev/cdroms/cdrom0 ] ; then
	echo "EEP! I have not found any cdroms!"
	echo "Can't continue."
	echo
	echo "Press -<enter>- to shut down"
	read
	echo -n o >/proc/sysrq-trigger
fi

first_pass=1
while : ; do
	scan_for_lvp
	if [ ${num_found} -ne 1 -o ${first_pass} -eq 0 ] ; then
		echo "Found ${num_found} LVP Disks. Please choose one:"
		choice=0
		for x in ${lvp_drives} ; do
			choice=$(( ${choice} + 1 ))
			echo "${choice}	${x}"
			eval "choice_${choice}=${x}"
		done
		echo
		echo "r	rescan devices"
		echo "0	shut down"
		read -p "> " s
		if [ "${s}" == "0" ] ; then
			echo "Ejecting LVP Disks"
			for x in ${lvp_drives} ; do
				eject -p ${x}
			done
			echo
			echo "Press -<enter>- to turn off the machine."
			read
			echo -n o >/proc/sysrq-trigger
			while : ; do echo -n ; done
		fi
	else
		s=1
		choice_1=${lvp_drives}
		echo "Found LVP Disk in ${choice_1}. Starting ..."
	fi
	first_pass=0

	exec 2>/dev/null
	if [ ${s} -gt 0 -a ${s} -le ${num_found} ] ; then
		eval "x=\${choice_${s}}"
		mount -n ${x} /mnt
		chroot /mnt /linuxrc
		# man, this sucks
		# sometimes the livesystem's linuxrc seems to be unable to umount everything...
		for x in 1 2 3 4 5 6 7 8 9 0 ; do
			umount /mnt/* >/dev/null 2>&1
		done
		umount /mnt
		eject ${x}
	fi
	exec 2>&1
done