bank_1_to_root

#!/bin/sh /etc/rc.common

START=00

. /lib/upgrade/common.sh

find_mtd_part() {
	local PART=$(awk -F: "/$1/{print \$1}" /proc/mtd)

	if [ ! -z "$PART" ]; then
		PART="${PART##mtd}"
		if [ ! -z "$PART" ]; then
			echo /dev/mtdblock$PART
		fi
	fi
}

find_mount_jffs2() {
	local options
	local mtdpartname
	local mtdpart

    echo "starting..."

	options=$(grep "^mount=" /etc/jffs2_options 2>/dev/null | sed "s/^mount=//" )
	if [ ! -z $options ]; then
		options="-o $options"
	fi

	mkdir -p /tmp/overlay

	for mtdpartname in bank_1; do
		mtdpart="$(find_mtd_part $mtdpartname)"
        echo $mtdpart
		if [ -n "$mtdpart" ]; then
			mount -t jffs2 $options $mtdpart /tmp/overlay
			if [ $? -ne 0 ]; then
				echo "failed to mount $mtdpartname on $mtdpart as jffs2"
			else
				mtd -qq unlock $mtdpartname
				if [ $? -ne 0 ]; then
					echo "failed to unlock $mtdpartname, partition not writeable"
					umount /tmp/overlay
				else
					return 0
				fi
			fi
		fi
	done

	echo "failed to find suitable partition to mount"
	return 1
}

find_available_ubi_num() {
	local lastubidevice=
	for x in $(ubinfo | grep "Present UBI devices" | cut -d':' -f2 | tr "," "\n")
	do
		lastubidevice=$x
	done

	if [ -z "$lastubidevice" ]
	then
		lastubidevice=ubi0
	fi

	last_num=$(echo $lastubidevice | sed 's/ubi//')
	avail_dev_num=`expr $last_num + 1`
	echo $avail_dev_num
}

find_mount_ubifs() {
	local partition=$1
	local dir=$2
	local mtd_file=/proc/mtd

	mtd_block_number=$(cat "$mtd_file" | grep -i "$partition" | sed 's/^mtd//' | awk -F ':' '{print $1}')
	if [ -z "$mtd_block_number" ]
	then
		echo "No $partition partition found"
		return 1
	fi
	echo "Detected block device: $dir for $partition" > /dev/kmsg
	mkdir -p "$dir"

	ubi_num="$(find_available_ubi_num)"
	ubiattach -m "$mtd_block_number" -d $ubi_num /dev/ubi_ctrl

	mount -t ubifs ubi$ubi_num:overlay $dir
	if [ $? -ne 0 ]; then
		echo "failed to mount ubi$ubi_num:overlay on ubifs"
		return 1
	fi

	mkdir -p $dir/0
	mkdir -p $dir/1

	return 0
}


pivot() { # <new_root> <old_root>
	local new=$1
	local old=$2
	mount -o move /proc $new/proc && \
	pivot_root $new $new$old && {
		mount -o move $old/dev /dev
		mount -o move $old/tmp /tmp
		mount -o move $old/sys /sys 2>&-
		mount -o move $old/overlay /overlay 2>&-
	}
}

fopivot() { # <rw_root> <ro_root>
	local rw_root=$1
	local ro_root=$2
	ovl=$(cat /proc/filesystems | grep "\overlay\b" | awk '{print $2}')
	if [ "$ovl" = "overlay" ]	#Since Linux 3.18-rc6, overlayfs has been renamed overlay
	then
		echo "mounting overlay fs"
		mount -t overlay -o lowerdir=/,upperdir=/overlay/1,workdir=/overlay/0 overlay /mnt && rw_root=/mnt
	else
		echo "mounting overlayfs fs"
		mount -t overlayfs -olowerdir=/,upperdir=$rw_root "overlayfs:$rw_root" /mnt && rw_root=/mnt
	fi
	pivot $rw_root $ro_root
}

check_banktable() {
	if [ -f /lib/modules/$(uname -r)/bankmgr.ko ]; then
		insmod bankmgr 2>/dev/null
	fi
}

ramoverlay() {
	echo "falling back to ramoverlay"
	mkdir -p /tmp/root
	mount -t tmpfs -o mode=0755 root /tmp/root
	echo "creating directories"
	# mirror dir tree from /rom to /tmp/root
	# special handling require for some as mounted fs's are skipped with xdev
	for f in $(find / -xdev -type d) dev overlay mnt proc tmp; do
		f=${f#/}
		if [ ! -z $f ]; then
			mkdir -p /tmp/root/$f
		fi
	done
	echo "setting up files"
	for f in $(find / -xdev -type f); do
		f=${f#/}
		case "$f" in
		rom/*)
			# we do not want to put files under /rom
			# they will be hidden when pivot_root puts the current root on /rom
			;;
		etc/config/*|\
		usr/lib/opkg/info/*)
			# file likely to be updated, copy
			cp -af /$f /tmp/root/$f
			;;
		*)
			ln -sf /rom/$f /tmp/root/$f
		esac
	done
	# handle symlinks seperately
	for f in $(find / -xdev -type l); do
		cp -af $f /tmp/root/${f#/}
	done
	echo "ramoverlay populated"
	pivot /tmp/root /rom
}

mount_root_tch() {
	local config

	find_mount_jffs2

	if [ $? -ne 0 ]; then
		find_mount_ubifs overlay /tmp/overlay
		if [ $? -ne 0 ]; then
			# ramoverlay
			return
		fi
	fi

	echo "switching to overlay"
	mount -o move /tmp/overlay /overlay 2>&-

	check_banktable
	if [ -f /proc/banktable/booted ]; then
		config=/overlay/$(cat /proc/banktable/booted)
	else
		config=/overlay
	fi

	# for f in /lib/mount_root/*; do
	# 	[ -x $f ] && $f $config
	# done

	mkdir -p $config
	fopivot $config /rom

	# make sure /tmp has the correct permissions !
	chmod 01777 /tmp
}

boot() {

mkdir /tmp/overlay_rootfs
mount -o move /overlay /tmp/overlay_rootfs
mount_root_tch
mkdir /overlay_rootfs
mkdir /tmp/tmp_rom
mount -o move /rom /tmp/tmp_rom 
mount -o move /tmp/overlay_rootfs /overlay_rootfs
mount -o move /tmp/tmp_rom/rom /rom
umount -l /tmp/tmp_rom

}


# do_switch()
# {
    # /bin/mtd unlock mtd3
    # /bin/mtd erase mtd3

    # /bin/mount

    # mount_root_tch

    # echo $(/bin/mount)
# }

# run_ramfs ''