#!/bin/sh

# set -e

export PATH="/root/usr/bin:/root/usr/sbin:/root/bin:/root/sbin:/usr/bin:/usr/sbin:/bin:/sbin"

echo "/root/lib" >> /etc/ld.so.conf
echo "/root/usr/lib" >> /etc/ld.so.conf

mountpoint="/live/image"
LIVE_MEDIA_PATH="live"

root_persistence="live-rw"
home_persistence="home-rw"
root_snapshot_label="live-sn"
home_snapshot_label="home-sn"

USERNAME="user"
USERFULLNAME="Live user"
HOSTNAME="host"

mkdir -p "${mountpoint}"

[ -f /etc/live.conf ] && . /etc/live.conf
export USERNAME USERFULLNAME HOSTNAME

. /scripts/live-helpers

if [ ! -f /live.vars ]
then
	touch /live.vars
fi

Arguments ()
{
	PRESEEDS=""

	for ARGUMENT in $(cat /proc/cmdline)
	do
		case "${ARGUMENT}" in
			access=*)
				ACCESS="${ARGUMENT#access=}"
				export ACCESS
				;;

			console=*)
				DEFCONSOLE="${ARGUMENT#*=}"
				export DEFCONSOLE
				;;

			debug)
				DEBUG="Yes"
				export DEBUG

				set -x
				;;

			fetch=*)
                                FETCH="${ARGUMENT#fetch=}"
                                export FETCH
                                ;;

			hook=*)
				HOOK="${ARGUMENT#hook=}"
				export HOOK
				;;

			ftpfs=*)
				FTPFS="${ARGUMENT#ftpfs=}"
				export FTPFS
				;;

			httpfs=*)
				HTTPFS="${ARGUMENT#httpfs=}"
				export HTTPFS
				;;

			hostname=*)
				HOSTNAME="${ARGUMENT#hostname=}"
				LIVECONF="changed"
				export HOSTNAME LIVECONF
				;;

			username=*)
				USERNAME="${ARGUMENT#username=}"
				LIVECONF="changed"
				export USERNAME LIVECONF
				;;

			userfullname=*)
				USERFULLNAME="${ARGUMENT#userfullname=}"
				LIVECONF="changed"
				export USERFULLNAME LIVECONF
				;;

			ignore_uuid)
				IGNORE_UUID="Yes"
				export IGNORE_UUID
				;;

			ip=*)
				STATICIP="${ARGUMENT#ip=}"

				if [ -z "${STATICIP}" ]
				then
					STATICIP="frommedia"
				fi

				export STATICIP
				;;

			keyb=*|kbd-chooser/method=*)
				KBD="${ARGUMENT#*=}"
				export KBD
				;;

			klayout=*|console-setup/layoutcode=*)
				KLAYOUT="${ARGUMENT#*=}"
				export KLAYOUT
				;;

			kvariant=*|console-setup/variantcode=*)
				KVARIANT="${ARGUMENT#*=}"
				export KVARIANT
				;;

			kmodel=*|console-setup/modelcode=*)
				KMODEL="${ARGUMENT#*=}"
				export KMODEL
				;;

			koptions=*)
				KOPTIONS="${ARGUMENT#koptions=}"
				export KOPTIONS
				;;

			live-getty)
				LIVE_GETTY="1"
				export LIVE_GETTY
				;;

			live-media=*|bootfrom=*)
				LIVE_MEDIA="${ARGUMENT#*=}"
				export LIVE_MEDIA
				;;

			live-media-encryption=*|encryption=*)
				LIVE_MEDIA_ENCRYPTION="${ARGUMENT#*=}"
				export LIVE_MEDIA_ENCRYPTION
				;;

			live-media-offset=*)
				LIVE_MEDIA_OFFSET="${ARGUMENT#live-media-offset=}"
				export LIVE_MEDIA_OFFSET
				;;

			live-media-path=*)
				LIVE_MEDIA_PATH="${ARGUMENT#live-media-path=}"
				export LIVE_MEDIA_PATH
				;;

			live-media-timeout=*)
				LIVE_MEDIA_TIMEOUT="${ARGUMENT#live-media-timeout=}"
				export LIVE_MEDIA_TIMEOUT
				;;

			language=*|debian-installer/language=*)
				language=${x#debian-installer/language=}
				locale="$(lang2locale "$language")"
				set_locale="true"
				;;

			locale=*|debian-installer/locale=*)
				LOCALE="${ARGUMENT#*=}"
				export LOCALE
				;;

			module=*)
				MODULE="${ARGUMENT#module=}"
				export MODULE
				;;

			netboot=*)
				NETBOOT="${ARGUMENT#netboot=}"
				export NETBOOT
				;;

			nfsopts=*)
				NFSOPTS="${ARGUMENT#nfsopts=}"
				export NFSOPTS
				;;

			nfscow=*)
				NFS_COW="${ARGUMENT#nfscow=}"
				export NFS_COW
				;;

			noaccessibility)
				NOACCESSIBILITY="Yes"
				export NOACCESSIBILITY
				;;

			noapparmor)
				NOAPPARMOR="Yes"
				export NOAPPARMOR
				;;

			noaptcdrom)
				NOAPTCDROM="Yes"
				export NOAPTCDROM
				;;

			noautologin)
				NOAUTOLOGIN="Yes"
				export NOAUTOLOGIN
				;;

			noxautologin)
				NOXAUTOLOGIN="Yes"
				export NOXAUTOLOGIN
				;;

			noconsolekeyboard)
				NOCONSOLEKEYBOARD="Yes"
				export NOCONSOLEKEYBOARD
				;;

			nofastboot)
				NOFASTBOOT="Yes"
				export NOFASTBOOT
				;;

			nofstab)
				NOFSTAB="Yes"
				export NOFSTAB
				;;

			nognomepanel)
				NOGNOMEPANEL="Yes"
				export NOGNOMEPANEL
				;;

			nohosts)
				NOHOSTS="Yes"
				export NOHOSTS
				;;

			nokpersonalizer)
				NOKPERSONALIZER="Yes"
				export NOKPERSONALIZER
				;;

			nolanguageselector)
				NOLANGUAGESELECTOR="Yes"
				export NOLANGUAGESELECTOR
				;;

			nolocales)
				NOLOCALES="Yes"
				export NOLOCALES
				;;

			nonetworking)
				NONETWORKING="Yes"
				export NONETWORKING
				;;

			nopowermanagement)
				NOPOWERMANAGEMENT="Yes"
				export NOPOWERMANAGEMENT
				;;

			noprogramcrashes)
				NOPROGRAMCRASHES="Yes"
				export NOPROGRAMCRASHES
				;;

			norestrictedmanager)
				NORESTRICTEDMANAGER="Yes"
				export NORESTRICTEDMANAGER
				;;

			nosudo)
				NOSUDO="Yes"
				export NOSUDO
				;;

			noswap)
				NOSWAP="Yes"
				export NOSWAP
				;;

			noupdatenotifier)
				NOUPDATENOTIFIER="Yes"
				export NOUPDATENOTIFIER
				;;

			nouser)
				NOUSER="Yes"
				export NOUSER
				;;

			noxautoconfig)
				NOXAUTOCONFIG="Yes"
				export NOXAUTOCONFIG
				;;

			noxscreensaver)
				NOXSCREENSAVER="Yes"
				export NOXSCREENSAVER
				;;

			persistent)
				PERSISTENT="Yes"
				export PERSISTENT
				;;

			nopersistent)
				NOPERSISTENT="Yes"
				export NOPERSISTENT
				;;

			preseed/file=*|file=*)
				LOCATION="${ARGUMENT#*=}"
				export LOCATION
				;;

			nopreseed)
				NOPRESEED="Yes"
				export NOPRESEED
				;;

			url=*)
				location="${ARGUMENT#url=}"

				mount -n -o bind /sys /root/sys
				mount -n -o bind /proc /root/proc
				mount -n -o bind /dev /root/dev

				mkdir -p /root/var/run/network
				chroot /root dhclient eth0
				chroot /root wget -P /tmp "${location}"
				chroot /root ifconfig eth0 down

				umount /root/sys
				umount /root/proc
				umount /root/dev

				LOCATION="/tmp/$(basename "${location}")"
				;;

			*/*=*)
				question="${ARGUMENT%%=*}"
				value="${ARGUMENT#*=}"
				PRESEEDS="${PRESEEDS}\"${question}=${value}\" "
				export PRESEEDS
				;;

			showmounts)
				SHOWMOUNTS="Yes"
				export SHOWMOUNTS
				;;

			textonly)
				TEXTONLY="Yes"
				export TEXTONLY
				;;

			timezone=*)
				TIMEZONE="${ARGUMENT#timezone=}"
				export TIMEZONE
				;;

			notimezone)
				NOTIMEZONE="Yes"
				export NOTIMEZONE
				;;

			todisk=*)
				TODISK="${ARGUMENT#todisk=}"
				export TODISK
				;;

			toram)
				TORAM="Yes"
				export TORAM
				;;

			toram=*)
				TORAM="Yes"
				MODULETORAM="${ARGUMENT#toram=}"
				export TORAM MODULETORAM
				;;

			exposedroot)
				EXPOSED_ROOT="Yes"
				export EXPOSED_ROOT
				;;

			plainroot)
				PLAIN_ROOT="Yes"
				export PLAIN_ROOT
				;;

			root=*)
				ROOT="${ARGUMENT#root=}"
				export ROOT
				;;

			union=*)
				UNIONTYPE="${ARGUMENT#union=}"
				export UNIONTYPE
				;;

			utc=*)
				UTC="${ARGUMENT#utc=}"
				export UTC
				;;

			xdebconf)
				XDEBCONF="Yes"
				export XDEBCONF
				;;

			xdriver=*)
			        XDRIVER="${ARGUMENT#xdriver=}"
				export XDRIVER
				;;

			xvideomode=*)
				XVIDEOMODE="${ARGUMENT#xvideomode=}"
				export XVIDEOMODE
				;;
		esac
	done

	# sort of compatibility with netboot.h from linux docs
	if [ -z "${NETBOOT}" ]
	then
		if [ "${ROOT}" = "/dev/nfs" ]
		then
			NETBOOT="nfs"
			export NETBOOT
		elif [ "${ROOT}" = "/dev/cifs" ]
		then
			NETBOOT="cifs"
			export NETBOOT
		fi
	fi

	if [ -z "${MODULE}" ]
	then
		MODULE="filesystem"
		export MODULE
	fi

	if [ -z "${UNIONTYPE}" ]
	then
		UNIONTYPE="unionfs"
		export UNIONTYPE
	fi
}

is_live_path ()
{
	DIRECTORY="${1}"

	if [ -d "${DIRECTORY}"/"${LIVE_MEDIA_PATH}" ]
	then
		for FILESYSTEM in squashfs ext2 ext3 xfs dir jffs2
		do
			if [ "$(echo ${DIRECTORY}/${LIVE_MEDIA_PATH}/*.${FILESYSTEM})" != "${DIRECTORY}/${LIVE_MEDIA_PATH}/*.${FILESYSTEM}" ]
			then
				return 0
			fi
		done
	fi

	return 1
}

matches_uuid ()
{
	if [ "${IGNORE_UUID}" ] || [ ! -e /conf/uuid.conf ]
	then
		return 0
	fi

	path="${1}"
	uuid="$(cat /conf/uuid.conf)"

	for try_uuid_file in "${mountpoint}/.disk/live-uuid"*
	do
		[ -e "${try_uuid_file}" ] || continue

		try_uuid="$(cat "${try_uuid_file}")"

		if [ "${uuid}" = "${try_uuid}" ]
		then
			return 0
		fi
	done

	return 1
}

get_backing_device ()
{
	case "${1}" in
		*.squashfs|*.ext2|*.ext3|*.jffs2)
			echo $(setup_loop "${1}" "loop" "/sys/block/loop*" '0' "${LIVE_MEDIA_ENCRYPTION}" "${2}")
			;;

		*.dir)
			echo "directory"
			;;

		*)
			panic "Unrecognized live filesystem: ${1}"
			;;
	esac
}

match_files_in_dir ()
{
	# Does any files match pattern ${1} ?
	local pattern="${1}"

	if [ "$(echo ${pattern})" != "${pattern}" ]
	then
		return 0
	fi

	return 1
}

mount_images_in_directory ()
{
	directory="${1}"
	rootmnt="${2}"
    	mac="${3}"


	if match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.squashfs" ||
		match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.ext2" ||
		match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.ext3" ||
		match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.jffs2" ||
		match_files_in_dir "${directory}/${LIVE_MEDIA_PATH}/*.dir"
	then
		[ -n "${mac}" ] && adddirectory="${directory}/${LIVE_MEDIA_PATH}/${mac}"
		setup_unionfs "${directory}/${LIVE_MEDIA_PATH}" "${rootmnt}" "${adddirectory}"
	else
		:
	fi
}

is_nice_device ()
{
	sysfs_path="${1#/sys}"

	if /lib/udev/path_id "${sysfs_path}" | grep -E -q "ID_PATH=(usb|pci-[^-]*-[ide|scsi|usb])"
	then
		return 0
	fi

	return 1
}

copy_live_to ()
{
	copyfrom="${1}"
	copytodev="${2}"
	copyto="${copyfrom}_swap"

	if [ -z "${MODULETORAM}" ]
	then
		size=$(fs_size "" ${copyfrom} "used")
	else
		MODULETORAMFILE="${copyfrom}/${LIVE_MEDIA_PATH}/${MODULETORAM}"

		if [ -f "${MODULETORAMFILE}" ]
		then
			size=$( expr $(ls -la ${MODULETORAMFILE} | awk '{print $5}') / 1024 + 5000 )
		else
			log_warning_msg "Error: toram-module ${MODULETORAM} (${MODULETORAMFILE}) could not be read."
			return 1
		fi
	fi

	if [ "${copytodev}" = "ram" ]
	then
		# copying to ram:
		freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - ) )
		mount_options="-o size=${size}k"
		free_string="memory"
		fstype="tmpfs"
		dev="/dev/shm"
	else
		# it should be a writable block device
		if [ -b "${copytodev}" ]
		then
			dev="${copytodev}"
			free_string="space"
			fstype=$(get_fstype "${dev}")
			freespace=$(fs_size "${dev}")
		else
			[ "$quiet" != "y" ] && log_warning_msg "${copytodev} is not a block device."
			return 1
		fi
	fi

	if [ "${freespace}" -lt "${size}" ]
	then
		[ "${quiet}" != "y" ] && log_warning_msg "Not enough free ${free_string} (${freespace}k free, ${size}k needed) to copy live media in ${copytodev}."
		return 1
	fi

	# begin copying (or uncompressing)
	mkdir "${copyto}"
	echo "mount -t ${fstype} ${mount_options} ${dev} ${copyto}"
	mount -t "${fstype}" ${mount_options} "${dev}" "${copyto}"

	if [ "${extension}" = "tgz" ]
	then
		cd "${copyto}"
		tar zxf "${copyfrom}/${LIVE_MEDIA_PATH}/$(basename ${FETCH})"
		rm -f "${copyfrom}/${LIVE_MEDIA_PATH}/$(basename ${FETCH})"
		mount -r -o move "${copyto}" "${rootmnt}"
		cd "${OLDPWD}"
	else
		if [ -n "${MODULETORAMFILE}" ]
		then
			cp ${MODULETORAMFILE} ${copyto} # copy only the filesystem module
		else
			cp -a ${copyfrom}/* ${copyto}   # "cp -a" from busybox also copies hidden files
		fi

		livefs_root
		umount ${copyfrom}
		mount -r -o move ${copyto} ${copyfrom}
	fi

	rmdir ${copyto}
	return 0
}

do_netmount ()
{
	rc=1

	modprobe -q af_packet # For DHCP

	udevtrigger
	udevsettle

	ipconfig ${DEVICE} | tee /netboot.config

	# source relevant ipconfig output
	OLDHOSTNAME=${HOSTNAME}
	. /tmp/net-${DEVICE}.conf
	[ -z ${HOSTNAME} ] && HOSTNAME=${OLDHOSTNAME}
	export HOSTNAME

	if [ "${NFSROOT}" = "auto" ]
	then
		NFSROOT=${ROOTSERVER}:${ROOTPATH}
	fi

	if ( [ -n "${FETCH}" ] || [ -n "${HTTPFS}" ] || [ -n "${FTPFS}" ] ) && do_httpmount
	then
		rc=0
		return ${rc}
	fi

	if [ "${NFSROOT#*:}" = "${NFSROOT}" ] && [ "$NETBOOT" != "cifs" ]
	then
		NFSROOT=${ROOTSERVER}:${NFSROOT}
	fi

	[ "${quiet}" != "y" ] && log_begin_msg "Trying netboot from ${NFSROOT}"

	if [ "${NETBOOT}" != "nfs" ] && do_cifsmount
	then
		rc=0
	elif do_nfsmount
	then
		NETBOOT="nfs"
		export NETBOOT
		rc=0
	fi

	[ "${quiet}" != "y" ] && log_end_msg
	return ${rc}
}

do_httpmount ()
{
	rc=1
	dest="${mountpoint}/${LIVE_MEDIA_PATH}"
	mount -t ramfs ram "${mountpoint}"
	mkdir -p "${dest}"

	for webfile in HTTPFS FTPFS FETCH
	do
		url="$(eval echo \"\$\{${webfile}\}\")"
		extension="$(echo "${url}" | sed 's/\(.*\)\.\(.*\)/\2/')"

		if [ -n "$url" ]
		then
			case "${extension}" in
				squashfs|tgz|tar)
					if [ "${webfile}" = "FETCH" ]
					then
						[ "${quiet}" != "y" ] &&
							log_begin_msg "Trying wget ${url} -O ${dest}/$(basename ${url})"
						wget "${url}" -O "${dest}/$(basename ${url})"
					else
						[ "${quiet}" != "y" ] &&
							log_begin_msg "Trying to mount ${url} on ${dest}/$(basename ${url})"
						if [ "${webfile}" = "FTPFS" ]
						then
							FUSE_MOUNT="curlftpfs"
							url="$(dirname ${url})"
						else
							FUSE_MOUNT="httpfs"
						fi
						modprobe fuse
						$FUSE_MOUNT "${url}" "${dest}"
					fi
					[ ${?} -eq 0 ] && rc=0
					[ "${extension}" = "tgz" ] && live_dest="ram"
					break
					;;

				*)
					[ "${quiet}" != "y" ] && log_begin_msg "Unrecognized archive extension for ${url}"
					;;
			esac
		fi
	done

	if [ ${rc} != 0 ]
	then
	    umount "${mountpoint}"
	fi

	return ${rc}
}

do_nfsmount ()
{
	rc=1

	modprobe -q nfs

	if [ -z "${NFSOPTS}" ]
	then
		NFSOPTS=""
	fi

	[ "${quiet}" != "y" ] && log_begin_msg "Trying nfsmount -o nolock -o ro ${NFSOPTS} ${NFSROOT} ${mountpoint}"

	# FIXME: This for loop is an ugly HACK round an nfs bug
	for i in 0 1 2 3 4 5 6 7 8 9 a b c d e f 10 11 12 13
	do
		nfsmount -o nolock -o ro ${NFSOPTS} "${NFSROOT}" "${mountpoint}" && rc=0 && break
		sleep 1
	done

	return ${rc}
}

do_cifsmount ()
{
	rc=1

	if [ -x "/sbin/mount.cifs" ]
	then
		if [ -z "${NFSOPTS}" ]
		then
			CIFSOPTS="-ouser=root,password="
		else
			CIFSOPTS="${NFSOPTS}"
		fi

		[ "${quiet}" != "y" ] && log_begin_msg "Trying mount.cifs ${NFSROOT} ${mountpoint} ${CIFSOPTS}"
		modprobe -q cifs

		if mount.cifs "${NFSROOT}" "${mountpoint}" "${CIFSOPTS}"
		then
			rc=0
		fi
	fi

	return ${rc}
}

do_snap_copy ()
{
	fromdev="${1}"
	todir="${2}"
	snap_type="${3}"
	size=$(fs_size "${fromdev}" "" "used")

	if [ -b "${fromdev}" ]
	then
		# look for free mem
		if [ -n "${HOMEMOUNTED}" -a "${snap_type}" = "HOME" ]
		then
			todev=$(cat /proc/mounts | grep -s " $(base_path ${todir}) " | awk '{print $1}' )
			freespace=$(df -k  | grep -s ${todev} | awk '{print $4}')
		else
			freespace=$( expr $(awk '/MemFree/{print $2}' /proc/meminfo) + $( cat /proc/meminfo | grep Cached | head -n 1 | awk '/Cached/{print $2}' - ))
		fi

		tomount="/mnt/tmpsnap"

		if [ ! -d "${tomount}" ]
		then
			mkdir -p "${tomount}"
		fi

		fstype=$(get_fstype "${fromdev}")

		if [ -n "${fstype}" ]
		then
			# Copying stuff...
			mount -t "${fstype}" -o ro,noatime "${fromdev}" "${tomount}"
			cp -a "${tomount}"/* ${todir}
			umount "${tomount}"
		else
			log_warning_msg "Unrecognized fstype: ${fstype} on ${fromdev}:${snap_type}"
		fi

		rmdir "${tomount}"

		if echo ${fromdev} | grep -qs loop
		then
			losetup -d "${fromdev}"
		fi

		return 0
	else
		return 1

		[ "${quiet}" != "y" ] && log_warning_msg "Unable to find the snapshot ${snap_type} medium"
	fi
}

try_snap ()
{
	# Look for ${snap_label}.* in block devices and copy the contents to ${snap_mount}
	# and remember the device and filename for resync on exit in live-initramfs.init

	snap_label="${1}"
	snap_mount="${2}"
	snap_type="${3}"
	snapdata=$(find_files "${snap_label}.squashfs ${snap_label}.cpio.gz ${snap_label}.ext2 ${snap_label}.ext3 ${snap_label}.jffs2")

	if [ ! -z "${snapdata}" ]
	then
		snapdev="$(echo ${snapdata} | cut -f1 -d ' ')"
		snapback="$(echo ${snapdata} | cut -f2 -d ' ')"
		snapfile="$(echo ${snapdata} | cut -f3 -d ' ')"

		if echo "${snapfile}" | grep -qs '\(squashfs\|ext2\|ext3\|jffs2\)'
		then
			# squashfs, jffs2 or ext2/ext3 snapshot
			dev=$(get_backing_device "${snapback}/${snapfile}")

			if ! do_snap_copy "${dev}" "${snap_mount}" "${snap_type}"
			then
				log_warning_msg "Impossible to include the ${snapfile} Snapshot"
				return 1
			fi
		else
			# cpio.gz snapshot
			if ! (cd "${snap_mount}" && zcat "${snapback}/${snapfile}" | cpio --extract --preserve-modification-time --no-absolute-filenames --sparse --unconditional --make-directories > /dev/null 2>&1)
			then
				log_warning_msg "Impossible to include the ${snapfile} Snapshot"
				return 1
			fi
		fi

		umount "${snapback}"
	else
		dev=$(find_cow_device "${snap_label}")

		if [ -b ${dev} ]
		then
			if echo "${dev}" | grep -qs loop
			then
				# strange things happens, user confused?
				snaploop=$( losetup ${dev} | awk '{print $3}' | tr -d '()' )
				snapfile=$(basename ${snaploop})
				snapdev=$(cat /proc/mounts | awk '{print $2,$1}' | grep -es "^$( dirname ${snaploop} )" | cut -f2 -d ' ')
			else
				snapdev="${dev}"
			fi

			if ! do_snap_copy "${dev}" "${snap_mount}" "${snap_type}"
			then
				log_warning_msg "Impossible to include the ${snap_label} Snapshot"
				return 1
			else
				if [ -n "${snapfile}" ]
				then
					# it was a loop device, user confused
					umount ${snapdev}
				fi
			fi
		else
			log_warning_msg "Impossible to include the ${snap_label} Snapshot"
			return 1
		fi
	fi

	echo "export ${snap_type}SNAP="${snap_mount}":${snapdev}:${snapfile}" >> /etc/live.conf # for resync on reboot/halt
	return 0
}

setup_unionfs ()
{
	image_directory="${1}"
	rootmnt="${2}"
        addimage_directory="${3}"
	modprobe -q -b ${UNIONTYPE}

	# run-init can't deal with images in a subdir, but we're going to
	# move all of these away before it runs anyway.  No, we're not,
	# put them in / since move-mounting them into / breaks mono and
	# some other apps.

	croot="/"

	# Let's just mount the read-only file systems first
	rofsstring=""
	rofslist=""
	minor_kernel_version=$(uname -r|cut -c 5-|sed 's/[^0-9].*//')

	if [ "${NETBOOT}" = "nfs" ] && [ "${minor_kernel_version}" -lt 22 ]
	then
		# go aroung a bug in nfs-unionfs locking for unionfs <= 1.4
		roopt="nfsro"
	elif [ "${UNIONTYPE}" = "aufs" ]
	then
		roopt="rr"
	else
		roopt="ro"
	fi

	# Read image names from ${MODULE}.module if it exists
	if [ -e "${image_directory}/filesystem.${MODULE}.module" ]
	then
		for IMAGE in $(cat ${image_directory}/filesystem.${MODULE}.module)
		do
			image_string="${image_string} ${image_directory}/${IMAGE}"
		done
	elif [ -e "${image_directory}/${MODULE}.module" ]
	then
		for IMAGE in $(cat ${image_directory}/${MODULE}.module)
		do
			image_string="${image_string} ${image_directory}/${IMAGE}"
		done
	else
		# ${MODULE}.module does not exist, create a list of images
		for FILESYSTEM in squashfs ext2 ext3 xfs jffs2 dir
		do
			for IMAGE in "${image_directory}"/*."${FILESYSTEM}"
			do
				if [ -e "${IMAGE}" ]
				then
					image_string="${image_string} ${IMAGE}"
				fi
			done
		done

		if [ -n "${addimage_directory}" ] && [ -d "${addimage_directory}" ]
		then
			for FILESYSTEM in squashfs ext2 ext3 xfs jffs2 dir
			do
				for IMAGE in "${addimage_directory}"/*."${FILESYSTEM}"
				do
					if [ -e "${IMAGE}" ]
					then
						image_string="${image_string} ${IMAGE}"
					fi
				done
			done
		fi

		# Now sort the list
		image_string="$(echo ${image_string} | sed -e 's/ /\n/g' | sort )"
	fi

	[ -n "${MODULETORAMFILE}" ] && image_string="${image_directory}/$(basename ${MODULETORAMFILE})"

	mkdir -p "${croot}"

	for image in ${image_string}
	do
		imagename=$(basename "${image}")

		if [ -d "${image}" ]
		then
			# it is a plain directory: do nothing
			rofsstring="${image}=${roopt}:${rofsstring}"
			rofslist="${image} ${rofslist}"
		elif [ -f "${image}" ]
		then
			if /sbin/losetup --help 2>&1 | grep -q -- "-r\b"
			then
				backdev=$(get_backing_device "${image}" "-r")
			else
				backdev=$(get_backing_device "${image}")
			fi
			fstype=$(get_fstype "${backdev}")

			if [ "${fstype}" = "unknown" ]
			then
				panic "Unknown file system type on ${backdev} (${image})"
			fi

			mkdir -p "${croot}/${imagename}"
			echo "debug: Mounting backdev \"${backdev}\" (image = ${image}) on croot/imagename \"${croot}/${imagename}\""
			mount -t "${fstype}" -o ro,noatime "${backdev}" "${croot}/${imagename}" || panic "Can not mount ${backdev} (${image}) on ${croot}/${imagename}" && rofsstring="${croot}/${imagename}=${roopt}:${rofsstring}" && rofslist="${croot}/${imagename} ${rofslist}"
		fi
	done

	rofsstring=${rofsstring%:}

	mkdir -p /cow

	# Looking for "${root_persistence}" device or file
	if [ -n "${PERSISTENT}" ] && [ -z "${NOPERSISTENT}" ]
	then
		# Load USB modules
		num_block=$(ls -l /sys/block | wc -l)
		for module in sd_mod uhci-hcd ehci-hcd ohci-hcd usb-storage
		do
			modprobe -q -b ${module}
		done

		udevtrigger
		udevsettle

		# For some reason, udevsettle does not block in this scenario,
		# so we sleep for a little while.
		#
		# See https://bugs.launchpad.net/ubuntu/+source/casper/+bug/84591
		for timeout in 5 4 3 2 1
		do
			sleep 1

			if [ $(ls -l /sys/block | wc -l) -gt ${num_block} ]
			then
				break
			fi
		done

		cowprobe=$(find_cow_device "${root_persistence}")

		if [ -b "${cowprobe}" ]
		then
			cowdevice=${cowprobe}
			cow_fstype=$(get_fstype "${cowprobe}")
		else
			[ "${quiet}" != "y" ] && log_warning_msg "Unable to find the persistent medium"
			cowdevice="tmpfs"
			cow_fstype="tmpfs"
		fi
	elif [ -n "${NFS_COW}" ] && [ -z "${NOPERSISTENT}" ]
	then
		# check if there are any nfs options
		if echo ${NFS_COW}|grep -q ','
		then
			nfs_cow_opts="-o nolock,$(echo ${NFS_COW}|cut -d, -f2-)"
			nfs_cow=$(echo ${NFS_COW}|cut -d, -f1)
		else
			nfs_cow_opts="-o nolock"
			nfs_cow=${NFS_COW}
		fi
		mac="$(get_mac)"
		if [ -n "${mac}" ]
		then
			cowdevice=$(echo ${nfs_cow}|sed "s/client_mac_address/${mac}/")
			cow_fstype="nfs"
		else
			panic "unable to determine mac address"
		fi
	else
		cowdevice="tmpfs"
		cow_fstype="tmpfs"
	fi

	if [ "${cow_fstype}" = "nfs" ]
	then
		[ "${quiet}" != "y" ] && log_begin_msg \
			"Trying nfsmount ${nfs_cow_opts} ${cowdevice} /cow"
		nfsmount ${nfs_cow_opts} ${cowdevice} /cow || \
			panic "Can not mount ${cowdevice} (n: ${cow_fstype}) on /cow"
	else
		mount -t ${cow_fstype} -o rw,noatime ${cowdevice} /cow || \
			panic "Can not mount ${cowdevice} (o: ${cow_fstype}) on /cow"
	fi

	rofscount=$(echo ${rofslist} |wc -w)

	if [ -n "${EXPOSED_ROOT}" ]
	then
		if [ ${rofscount} -ne 1 ]
		then
			panic "only one RO file system supported with exposedroot: ${rofslist}"
		fi
		exposedrootfs=${rofslist%% }

		mount --bind ${exposedrootfs} ${rootmnt} || \
			panic "bind mount of ${exposedrootfs} failed"

		cow_dirs='/var/tmp /var/lock /var/run /var/log /var/spool
			/home /var/lib/live'

		for dir in ${cow_dirs}; do
			mkdir -p /cow${dir}
			mount -t ${UNIONTYPE} \
				-o rw,noatime,dirs=/cow${dir}=rw:${exposedrootfs}${dir}=ro \
				${UNIONTYPE} "${rootmnt}${dir}" || \
				panic "mount ${UNIONTYPE} on ${rootmnt}${dir} failed with option \
					rw,noatime,dirs=/cow${dir}=rw:${exposedrootfs}${dir}=ro"
		done
	else
		mount -t ${UNIONTYPE} -o noatime,dirs=/cow=rw:${rofsstring} \
			${UNIONTYPE} "${rootmnt}" || panic "mount ${UNIONTYPE} on \
			${rootmnt} failed with option noatime,dirs=/cow=rw:${rofsstring}"
	fi

	# tmpfs file systems
	mkdir -p "${rootmnt}/live"
	mount -t tmpfs tmpfs ${rootmnt}/live

	# Adding other custom mounts
	if [ -n "${PERSISTENT}" ] && [ -z "${NOPERSISTENT}" ]
	then
		# directly mount /home
		# FIXME: add a custom mounts configurable system
		homecow=$(find_cow_device "${home_persistence}" )

		if [ -b "${homecow}" ]
		then
			mount -t $(get_fstype "${homecow}") -o rw,noatime "${homecow}" "${rootmnt}/home"
			export HOMEMOUNTED=1 # used to proper calculate free space in do_snap_copy()
		else
			[ "${quiet}" != "y" ] && log_warning_msg "Unable to find the persistent home medium"
		fi

		# Look for other snapshots to copy in
		try_snap "${root_snapshot_label}" "${rootmnt}" "ROOT"
		try_snap "${home_snapshot_label}" "${rootmnt}/home" "HOME"
	fi

	if [ -n "${SHOWMOUNTS}" ]
	then
		for d in ${rofslist}
		do
			mkdir -p "${rootmnt}/live/${d##*/}"

			case d in
				*.dir)
					# do nothing # mount -o bind "${d}" "${rootmnt}/live/${d##*/}"
					;;

				*)
					mount -o move "${d}" "${rootmnt}/live/${d##*/}"
					;;
			esac
		done
	fi

	# shows cow fs on /cow for use by live-snapshot
	mkdir -p "${rootmnt}/live/cow"
	mount -o move /cow "${rootmnt}/live/cow" || mount -o bind /cow "${rootmnt}/live/cow" || [ "${quiet}" != "y" ] && log_warning_msg "Unable to move or bind /cow to ${rootmnt}/live/cow"
}

check_dev ()
{
	sysdev="${1}"
	devname="${2}"
	skip_uuid_check="${3}"

	if [ -z "${devname}" ]
	then
		devname=$(sys2dev "${sysdev}")
	fi

	if [ -n "${LIVE_MEDIA_OFFSET}" ]
	then
		loopdevname=$(setup_loop "${devname}" "loop" "/sys/block/loop*" "${LIVE_MEDIA_OFFSET}" '')
		devname="${loopdevname}"
	fi

	if [ -d "${devname}" ]
	then
		mount -o bind "${devname}" $mountpoint || continue

		if is_live_path $mountpoint
		then
			echo $mountpoint
			return 0
		else
			umount $mountpoint
		fi
	fi

	fstype=$(get_fstype "${devname}")

	if is_supported_fs ${fstype}
	then
		mount -t ${fstype} -o ro,noatime "${devname}" ${mountpoint} || continue

		if is_live_path ${mountpoint} && \
			([ "${skip_uuid_check}" ] || matches_uuid ${mountpoint})
		then
			echo ${mountpoint}
			return 0
		else
			umount ${mountpoint}
		fi
	fi

	if [ -n "${LIVE_MEDIA_OFFSET}" ]
	then
		losetup -d "${loopdevname}"
	fi

	return 1
}

find_livefs ()
{
	timeout="${1}"

	# first look at the one specified in the command line
	if [ ! -z "${LIVE_MEDIA}" ]
	then
		if check_dev "null" "${LIVE_MEDIA}" "skip_uuid_check"
		then
			return 0
		fi
	fi

	# don't start autodetection before timeout has expired
	if [ -n "${LIVE_MEDIA_TIMEOUT}" ]
	then
		if [ "${timeout}" -lt "${LIVE_MEDIA_TIMEOUT}" ]
		then
			return 1
		fi
	fi

	# or do the scan of block devices
	for sysblock in $(echo /sys/block/* | tr ' ' '\n' | grep -v loop | grep -v ram | grep -v 'dm-' | grep -v fd )
	do
		devname=$(sys2dev "${sysblock}")
		fstype=$(get_fstype "${devname}")

		if /lib/udev/cdrom_id ${devname} > /dev/null
		then
			if check_dev "null" "${devname}"
			then
				return 0
			fi
		elif is_nice_device "${sysblock}"
		then
			for dev in $(subdevices "${sysblock}")
			do
				if check_dev "${dev}"
				then
					return 0
				fi
			done
		elif [ "${fstype}" = "squashfs" -o \
			"${fstype}" = "ext2" -o \
			"${fstype}" = "ext3" -o \
			"${fstype}" = "jffs2" ]
		then
			# This is an ugly hack situation, the block device has
			# an image directly on it.  It's hopefully
			# live-initramfs, so take it and run with it.
			ln -s "${devname}" "${devname}.${fstype}"
			echo "${devname}.${fstype}"
			return 0
		fi
	done

	return 1
}

set_usplash_timeout ()
{
	if [ -x /sbin/usplash_write ]
	then
		/sbin/usplash_write "TIMEOUT 120"
	fi
}

mountroot ()
{
    
        if [ -x /scripts/local-top/cryptroot ]; then
	    /scripts/local-top/cryptroot
	fi

	exec 6>&1
	exec 7>&2
	exec > live.log
	exec 2>&1
	tail -f live.log >&7 &
	tailpid="${!}"

	Arguments

	set_usplash_timeout
	[ "${quiet}" != "y" ] && log_begin_msg "Running /scripts/live-premount"
	run_scripts /scripts/live-premount
	[ "${quiet}" != "y" ] && log_end_msg

	# Needed here too because some things (*cough* udev *cough*)
	# changes the timeout

	set_usplash_timeout

	if [ ! -z "${NETBOOT}" ] || [ ! -z "${FETCH}" ] || [ ! -z "${HTTPFS}" ] || [ ! -z "${FTPFS}" ]
	then
		if do_netmount
		then
			livefs_root="${mountpoint}"
		else
			panic "Unable to find a live file system on the network"
		fi
	else
		if [ -n "${PLAIN_ROOT}" ] && [ -n "${ROOT}" ]
		then
			# Do a local boot from hd
			livefs_root=${ROOT}
		else
			# Scan local devices for the image
			for i in 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
			do
				livefs_root=$(find_livefs ${i})

				if [ -n "${livefs_root}" ]
				then
					break
				fi

				sleep 1
			done
		fi
	fi

	if [ -z "${livefs_root}" ]
	then
		panic "Unable to find a medium containing a live file system"
	fi

	if [ "${TORAM}" ]
	then
		live_dest="ram"
	elif [ "${TODISK}" ]
	then
		live_dest="${TODISK}"
	fi

	if [ "${live_dest}" ]
	then
		log_begin_msg "Copying live media to ${live_dest}"
		copy_live_to "${livefs_root}" "${live_dest}"
		log_end_msg
	fi

	if [ -n "${MODULETORAMFILE}" ]
	then
		setup_unionfs "${livefs_root}" "${rootmnt}"
	else
		mac="$(get_mac)"
		mac="$(echo ${mac} | sed 's/-//g')"
		mount_images_in_directory "${livefs_root}" "${rootmnt}" "${mac}"
	fi

	log_end_msg

	maybe_break live-bottom
	[ "${quiet}" != "y" ] && log_begin_msg "Running /scripts/live-bottom"

	run_scripts /scripts/live-bottom
	[ "${quiet}" != "y" ] && log_end_msg

	exec 1>&6 6>&-
	exec 2>&7 7>&-
	kill ${tailpid}
	cp live.log "${rootmnt}/var/log/"
}