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+# Local filesystem mounting			-*- shell-script -*-
 #
 ################################################################
 # File:
 # /scripts/local
 #
 # Root, or / in these notes is the initrd's (busybox) root,
 # not your system's root!
 #
 # You need the aufs module for this to work.  To do this install
 # aufs on your base install, add aufs to: /etc/initramfs-tools/modules
 # Now using your target kernel run:
 # mkinitramfs -o initrd.img <kernel-name>
 #
 # make a directory, copy an initrd to it then cd to it and:
 #
 # mv initrd.img initrd.img.gz
 # gunzip initrd.img.gz
 #
 # make sure aufs exists somewhere in /lib/modules/<uname -r>/
 # After modifying local script, etc do the following in the initrd's
 # root folder where /bin and /lib etc is to create a new initrd:
 #
 # find ./ -print | cpio -H newc -o > ../newinitrd.img
 #
 # Now tell grub to use this initrd for a RO root filesystem
 #
 # Note fstab gets hosed, if you need an fstab, make sure this
 # script reflects that.  I use an fstab for the default initrd for RW
 # and none for RO, but you can make this script use a different one for
 # RO if you want.
 ################################################################
 # Parameter: device node to check
 # Echos fstype to stdout
 # Return value: indicates if an fs could be recognized
 get_fstype ()
 {
 	local FS FSTYPE FSSIZE RET
 	FS="${1}"
 
 	# vol_id has a more complete list of file systems,
 	# but fstype is more robust
 	eval $(fstype "${FS}" 2> /dev/null)
 	if [ "$FSTYPE" = "unknown" ] && [ -x /lib/udev/vol_id ]; then
 		FSTYPE=$(/lib/udev/vol_id -t "${FS}" 2> /dev/null)
 	fi
 	RET=$?
 
 	if [ -z "${FSTYPE}" ]; then
 		FSTYPE="unknown"
 	fi
 
 	echo "${FSTYPE}"
 	return ${RET}
 }
 
 # Parameter: Where to mount the filesystem
 mountroot ()
 {
 	[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/local-top"
 	run_scripts /scripts/local-top
 	[ "$quiet" != "y" ] && log_end_msg
 
 	wait_for_udev 10
 
 	# If the root device hasn't shown up yet, give it a little while
 	# to deal with removable devices
 	if [ ! -e "${ROOT}" ] || ! $(get_fstype "${ROOT}" >/dev/null); then
 		log_begin_msg "Waiting for root file system"
 
 		# Default delay is 180s
 		if [ -z "${ROOTDELAY}" ]; then
 			slumber=180
 		else
 			slumber=${ROOTDELAY}
 		fi
 		if [ -x /sbin/usplash_write ]; then
 			/sbin/usplash_write "TIMEOUT ${slumber}" || true
 		fi
 
 		slumber=$(( ${slumber} * 10 ))
 		while [ ! -e "${ROOT}" ] \
 		|| ! $(get_fstype "${ROOT}" >/dev/null); do
 			/bin/sleep 0.1
 			slumber=$(( ${slumber} - 1 ))
 			[ ${slumber} -gt 0 ] || break
 		done
 
 		if [ ${slumber} -gt 0 ]; then
 			log_end_msg 0
 		else
 			log_end_msg 1 || true
 		fi
 		if [ -x /sbin/usplash_write ]; then
 			/sbin/usplash_write "TIMEOUT 15" || true
 		fi
 	fi
 
 	# We've given up, but we'll let the user fix matters if they can
 	while [ ! -e "${ROOT}" ]; do
 		# give hint about renamed root
 		case "${ROOT}" in
 		/dev/hd*)
 			suffix="${ROOT#/dev/hd}"
 			major="${suffix%[[:digit:]]}"
 			major="${major%[[:digit:]]}"
 			if [ -d "/sys/block/sd${major}" ]; then
 				echo "WARNING bootdevice may be renamed. Try root=/dev/sd${suffix}"
 			fi
 			;;
 		/dev/sd*)
 			suffix="${ROOT#/dev/sd}"
 			major="${suffix%[[:digit:]]}"
 			major="${major%[[:digit:]]}"
 			if [ -d "/sys/block/hd${major}" ]; then
 				echo "WARNING bootdevice may be renamed. Try root=/dev/hd${suffix}"
 			fi
 			;;
 		esac
 		echo "Gave up waiting for root device.  Common problems:"
 		echo " - Boot args (cat /proc/cmdline)"
 		echo "   - Check rootdelay= (did the system wait long enough?)"
 		echo "   - Check root= (did the system wait for the right device?)"
 		echo " - Missing modules (cat /proc/modules; ls /dev)"
 		panic "ALERT!  ${ROOT} does not exist.  Dropping to a shell!"
 	done
 
 	# Get the root filesystem type if not set
 	if [ -z "${ROOTFSTYPE}" ]; then
 		FSTYPE=$(get_fstype "${ROOT}")
 	else
 		FSTYPE=${ROOTFSTYPE}
 	fi
 
 	[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/local-premount"
 	run_scripts /scripts/local-premount
 	[ "$quiet" != "y" ] && log_end_msg
 
 	if [ "${readonly}" = "y" ]; then
 		roflag=-r
 	else
 		roflag=-w
 	fi
 
 	# FIXME This has no error checking
 
 	modprobe ${FSTYPE}
 ##########################################################################
 ###### Mod'd by Brian Phelps aka Electronjunkie ##########################
 
          mkdir /root/.tmpfs
          mkdir /root/.rootfs
 
          mount -r -t ext2 /dev/sda1 /root/.rootfs
 
          modprobe aufs
          modprobe loop
          mount -t tmpfs -o size=20M tmpfs /root/.tmpfs
 
          mount -t aufs  -o br:/root/.tmpfs=rw:/root/.rootfs=ro none /root/
          mv /root/etc/fstab /root/etc/fstab.defunct
 
 #########################################################################
 
 	# FIXME This has no error checking
 	# Mount root
 
 	[ "$quiet" != "y" ] && log_begin_msg "Running /scripts/local-bottom"
 	run_scripts /scripts/local-bottom
 	[ "$quiet" != "y" ] && log_end_msg
 }