Initial commit

package/base-files/files/lib/upgrade/common.sh

@@ -0,0 +1,241 @@
+#!/bin/sh
+
+RAM_ROOT=/tmp/root
+
+export BACKUP_FILE=sysupgrade.tgz	# file extracted by preinit
+
+[ -x /usr/bin/ldd ] || ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
+libs() { ldd $* 2>/dev/null | sed -r 's/(.* => )?(.*) .*/\2/'; }
+
+install_file() { # <file> [ <file> ... ]
+	local target dest dir
+	for file in "$@"; do
+		if [ -L "$file" ]; then
+			target="$(readlink -f "$file")"
+			dest="$RAM_ROOT/$file"
+			[ ! -f "$dest" ] && {
+				dir="$(dirname "$dest")"
+				mkdir -p "$dir"
+				ln -s "$target" "$dest"
+			}
+			file="$target"
+		fi
+		dest="$RAM_ROOT/$file"
+		[ -f "$file" -a ! -f "$dest" ] && {
+			dir="$(dirname "$dest")"
+			mkdir -p "$dir"
+			cp "$file" "$dest"
+		}
+	done
+}
+
+install_bin() {
+	local src files
+	src=$1
+	files=$1
+	[ -x "$src" ] && files="$src $(libs $src)"
+	install_file $files
+}
+
+run_hooks() {
+	local arg="$1"; shift
+	for func in "$@"; do
+		eval "$func $arg"
+	done
+}
+
+ask_bool() {
+	local default="$1"; shift;
+	local answer="$default"
+
+	[ "$INTERACTIVE" -eq 1 ] && {
+		case "$default" in
+			0) echo -n "$* (y/N): ";;
+			*) echo -n "$* (Y/n): ";;
+		esac
+		read answer
+		case "$answer" in
+			y*) answer=1;;
+			n*) answer=0;;
+			*) answer="$default";;
+		esac
+	}
+	[ "$answer" -gt 0 ]
+}
+
+v() {
+	[ "$VERBOSE" -ge 1 ] && echo "$@"
+}
+
+json_string() {
+	local v="$1"
+	v="${v//\\/\\\\}"
+	v="${v//\"/\\\"}"
+	echo "\"$v\""
+}
+
+rootfs_type() {
+	/bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
+}
+
+get_image() { # <source> [ <command> ]
+	local from="$1"
+	local cmd="$2"
+
+	if [ -z "$cmd" ]; then
+		local magic="$(dd if="$from" bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
+		case "$magic" in
+			1f8b) cmd="zcat";;
+			425a) cmd="bzcat";;
+			*) cmd="cat";;
+		esac
+	fi
+
+	cat "$from" 2>/dev/null | $cmd
+}
+
+get_magic_word() {
+	(get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
+}
+
+get_magic_long() {
+	(get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
+}
+
+export_bootdevice() {
+	local cmdline bootdisk rootpart uuid blockdev uevent line class
+	local MAJOR MINOR DEVNAME DEVTYPE
+
+	if read cmdline < /proc/cmdline; then
+		case "$cmdline" in
+			*block2mtd=*)
+				bootdisk="${cmdline##*block2mtd=}"
+				bootdisk="${bootdisk%%,*}"
+			;;
+			*root=*)
+				rootpart="${cmdline##*root=}"
+				rootpart="${rootpart%% *}"
+			;;
+		esac
+
+		case "$bootdisk" in
+			/dev/*)
+				uevent="/sys/class/block/${bootdisk##*/}/uevent"
+			;;
+		esac
+
+		case "$rootpart" in
+			PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-[a-f0-9][a-f0-9])
+				uuid="${rootpart#PARTUUID=}"
+				uuid="${uuid%-[a-f0-9][a-f0-9]}"
+				for blockdev in $(find /dev -type b); do
+					set -- $(dd if=$blockdev bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
+					if [ "$4$3$2$1" = "$uuid" ]; then
+						uevent="/sys/class/block/${blockdev##*/}/uevent"
+						break
+					fi
+				done
+			;;
+			/dev/*)
+				uevent="/sys/class/block/${rootpart##*/}/../uevent"
+			;;
+			0x[a-f0-9][a-f0-9][a-f0-9] | 0x[a-f0-9][a-f0-9][a-f0-9][a-f0-9] | \
+			[a-f0-9][a-f0-9][a-f0-9] | [a-f0-9][a-f0-9][a-f0-9][a-f0-9])
+				rootpart=0x${rootpart#0x}
+				for class in /sys/class/block/*; do
+					while read line; do
+						export -n "$line"
+					done < "$class/uevent"
+					if [ $((rootpart/256)) = $MAJOR -a $((rootpart%256)) = $MINOR ]; then
+						uevent="$class/../uevent"
+					fi
+				done
+			;;
+		esac
+
+		if [ -e "$uevent" ]; then
+			while read line; do
+				export -n "$line"
+			done < "$uevent"
+			export BOOTDEV_MAJOR=$MAJOR
+			export BOOTDEV_MINOR=$MINOR
+			return 0
+		fi
+	fi
+
+	return 1
+}
+
+export_partdevice() {
+	local var="$1" offset="$2"
+	local uevent line MAJOR MINOR DEVNAME DEVTYPE
+
+	for uevent in /sys/class/block/*/uevent; do
+		while read line; do
+			export -n "$line"
+		done < "$uevent"
+		if [ $BOOTDEV_MAJOR = $MAJOR -a $(($BOOTDEV_MINOR + $offset)) = $MINOR -a -b "/dev/$DEVNAME" ]; then
+			export "$var=$DEVNAME"
+			return 0
+		fi
+	done
+
+	return 1
+}
+
+hex_le32_to_cpu() {
+	[ "$(echo 01 | hexdump -v -n 2 -e '/2 "%x"')" = "3031" ] && {
+		echo "${1:0:2}${1:8:2}${1:6:2}${1:4:2}${1:2:2}"
+		return
+	}
+	echo "$@"
+}
+
+get_partitions() { # <device> <filename>
+	local disk="$1"
+	local filename="$2"
+
+	if [ -b "$disk" -o -f "$disk" ]; then
+		v "Reading partition table from $filename..."
+
+		local magic=$(dd if="$disk" bs=2 count=1 skip=255 2>/dev/null)
+		if [ "$magic" != $'\x55\xAA' ]; then
+			v "Invalid partition table on $disk"
+			exit
+		fi
+
+		rm -f "/tmp/partmap.$filename"
+
+		local part
+		for part in 1 2 3 4; do
+			set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk")
+
+			local type="$(( $(hex_le32_to_cpu $1) % 256))"
+			local lba="$(( $(hex_le32_to_cpu $2) ))"
+			local num="$(( $(hex_le32_to_cpu $3) ))"
+
+			[ $type -gt 0 ] || continue
+
+			printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename"
+		done
+	fi
+}
+
+indicate_upgrade() {
+	. /etc/diag.sh
+	set_state upgrade
+}
+
+# Flash firmware to MTD partition
+#
+# $(1): path to image
+# $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
+default_do_upgrade() {
+	sync
+	if [ -n "$UPGRADE_BACKUP" ]; then
+		get_image "$1" "$2" | mtd $MTD_ARGS $MTD_CONFIG_ARGS -j "$UPGRADE_BACKUP" write - "${PART_NAME:-image}"
+	else
+		get_image "$1" "$2" | mtd $MTD_ARGS write - "${PART_NAME:-image}"
+	fi
+	[ $? -ne 0 ] && exit 1
+}

package/base-files/files/lib/upgrade/do_stage2

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+. /lib/functions.sh
+
+include /lib/upgrade
+
+v "Performing system upgrade..."
+if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
+	platform_do_upgrade "$IMAGE"
+else
+	default_do_upgrade "$IMAGE"
+fi
+
+if [ -n "$UPGRADE_BACKUP" ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
+	platform_copy_config
+fi
+
+v "Upgrade completed"
+sleep 1
+
+v "Rebooting system..."
+umount -a
+reboot -f
+sleep 5
+echo b 2>/dev/null >/proc/sysrq-trigger

package/base-files/files/lib/upgrade/fwtool.sh

@@ -0,0 +1,65 @@
+fwtool_check_signature() {
+	[ $# -gt 1 ] && return 1
+
+	[ ! -x /usr/bin/ucert ] && {
+		if [ "$REQUIRE_IMAGE_SIGNATURE" = 1 ]; then
+			return 1
+		else
+			return 0
+		fi
+	}
+
+	if ! fwtool -q -s /tmp/sysupgrade.ucert "$1"; then
+		echo "Image signature not found"
+		[ "$REQUIRE_IMAGE_SIGNATURE" = 1 -a "$FORCE" != 1 ] && {
+			echo "Use sysupgrade -F to override this check when downgrading or flashing to vendor firmware"
+		}
+		[ "$REQUIRE_IMAGE_SIGNATURE" = 1 ] && return 1
+		return 0
+	fi
+
+	fwtool -q -T -s /dev/null "$1" | \
+		ucert -V -m - -c "/tmp/sysupgrade.ucert" -P /etc/opkg/keys
+
+	return $?
+}
+
+fwtool_check_image() {
+	[ $# -gt 1 ] && return 1
+
+	. /usr/share/libubox/jshn.sh
+
+	if ! fwtool -q -i /tmp/sysupgrade.meta "$1"; then
+		echo "Image metadata not found"
+		[ "$REQUIRE_IMAGE_METADATA" = 1 -a "$FORCE" != 1 ] && {
+			echo "Use sysupgrade -F to override this check when downgrading or flashing to vendor firmware"
+		}
+		[ "$REQUIRE_IMAGE_METADATA" = 1 ] && return 1
+		return 0
+	fi
+
+	json_load "$(cat /tmp/sysupgrade.meta)" || {
+		echo "Invalid image metadata"
+		return 1
+	}
+
+	device="$(cat /tmp/sysinfo/board_name)"
+
+	json_select supported_devices || return 1
+
+	json_get_keys dev_keys
+	for k in $dev_keys; do
+		json_get_var dev "$k"
+		[ "$dev" = "$device" ] && return 0
+	done
+
+	echo "Device $device not supported by this image"
+	echo -n "Supported devices:"
+	for k in $dev_keys; do
+		json_get_var dev "$k"
+		echo -n " $dev"
+	done
+	echo
+
+	return 1
+}

package/base-files/files/lib/upgrade/keep.d/base-files-essential

@@ -0,0 +1,10 @@
+# Essential files that will be always kept
+/etc/hosts
+/etc/inittab
+/etc/group
+/etc/passwd
+/etc/profile
+/etc/shadow
+/etc/shells
+/etc/sysctl.conf
+/etc/rc.local

package/base-files/files/lib/upgrade/nand.sh

@@ -0,0 +1,323 @@
+#!/bin/sh
+# Copyright (C) 2014 OpenWrt.org
+#
+
+. /lib/functions.sh
+
+# 'kernel' partition on NAND contains the kernel
+CI_KERNPART="${CI_KERNPART:-kernel}"
+
+# 'ubi' partition on NAND contains UBI
+CI_UBIPART="${CI_UBIPART:-ubi}"
+
+# 'rootfs' partition on NAND contains the rootfs
+CI_ROOTPART="${CI_ROOTPART:-rootfs}"
+
+ubi_mknod() {
+	local dir="$1"
+	local dev="/dev/$(basename $dir)"
+
+	[ -e "$dev" ] && return 0
+
+	local devid="$(cat $dir/dev)"
+	local major="${devid%%:*}"
+	local minor="${devid##*:}"
+	mknod "$dev" c $major $minor
+}
+
+nand_find_volume() {
+	local ubidevdir ubivoldir
+	ubidevdir="/sys/devices/virtual/ubi/$1"
+	[ ! -d "$ubidevdir" ] && return 1
+	for ubivoldir in $ubidevdir/${1}_*; do
+		[ ! -d "$ubivoldir" ] && continue
+		if [ "$( cat $ubivoldir/name )" = "$2" ]; then
+			basename $ubivoldir
+			ubi_mknod "$ubivoldir"
+			return 0
+		fi
+	done
+}
+
+nand_find_ubi() {
+	local ubidevdir ubidev mtdnum
+	mtdnum="$( find_mtd_index $1 )"
+	[ ! "$mtdnum" ] && return 1
+	for ubidevdir in /sys/devices/virtual/ubi/ubi*; do
+		[ ! -d "$ubidevdir" ] && continue
+		cmtdnum="$( cat $ubidevdir/mtd_num )"
+		[ ! "$mtdnum" ] && continue
+		if [ "$mtdnum" = "$cmtdnum" ]; then
+			ubidev=$( basename $ubidevdir )
+			ubi_mknod "$ubidevdir"
+			echo $ubidev
+			return 0
+		fi
+	done
+}
+
+nand_get_magic_long() {
+	dd if="$1" skip=$2 bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
+}
+
+get_magic_long_tar() {
+	( tar xf $1 $2 -O | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2> /dev/null
+}
+
+identify_magic() {
+	local magic=$1
+	case "$magic" in
+		"55424923")
+			echo "ubi"
+			;;
+		"31181006")
+			echo "ubifs"
+			;;
+		"68737173")
+			echo "squashfs"
+			;;
+		"d00dfeed")
+			echo "fit"
+			;;
+		"4349"*)
+			echo "combined"
+			;;
+		*)
+			echo "unknown $magic"
+			;;
+	esac
+}
+
+
+identify() {
+	identify_magic $(nand_get_magic_long "$1" "${2:-0}")
+}
+
+identify_tar() {
+	identify_magic $(get_magic_long_tar "$1" "$2")
+}
+
+nand_restore_config() {
+	sync
+	local ubidev=$( nand_find_ubi $CI_UBIPART )
+	local ubivol="$( nand_find_volume $ubidev rootfs_data )"
+	[ ! "$ubivol" ] &&
+		ubivol="$( nand_find_volume $ubidev $CI_ROOTPART )"
+	mkdir /tmp/new_root
+	if ! mount -t ubifs /dev/$ubivol /tmp/new_root; then
+		echo "mounting ubifs $ubivol failed"
+		rmdir /tmp/new_root
+		return 1
+	fi
+	mv "$1" "/tmp/new_root/$BACKUP_FILE"
+	umount /tmp/new_root
+	sync
+	rmdir /tmp/new_root
+}
+
+nand_upgrade_prepare_ubi() {
+	local rootfs_length="$1"
+	local rootfs_type="$2"
+	local has_kernel="${3:-0}"
+	local has_env="${4:-0}"
+
+	local mtdnum="$( find_mtd_index "$CI_UBIPART" )"
+	if [ ! "$mtdnum" ]; then
+		echo "cannot find ubi mtd partition $CI_UBIPART"
+		return 1
+	fi
+
+	local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+	if [ ! "$ubidev" ]; then
+		ubiattach -m "$mtdnum"
+		sync
+		ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+	fi
+
+	if [ ! "$ubidev" ]; then
+		ubiformat /dev/mtd$mtdnum -y
+		ubiattach -m "$mtdnum"
+		sync
+		ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+		[ "$has_env" -gt 0 ] && {
+			ubimkvol /dev/$ubidev -n 0 -N ubootenv -s 1MiB
+			ubimkvol /dev/$ubidev -n 1 -N ubootenv2 -s 1MiB
+		}
+	fi
+
+	local kern_ubivol="$( nand_find_volume $ubidev $CI_KERNPART )"
+	local root_ubivol="$( nand_find_volume $ubidev $CI_ROOTPART )"
+	local data_ubivol="$( nand_find_volume $ubidev rootfs_data )"
+
+	# remove ubiblock device of rootfs
+	local root_ubiblk="ubiblock${root_ubivol:3}"
+	if [ "$root_ubivol" -a -e "/dev/$root_ubiblk" ]; then
+		echo "removing $root_ubiblk"
+		if ! ubiblock -r /dev/$root_ubivol; then
+			echo "cannot remove $root_ubiblk"
+			return 1;
+		fi
+	fi
+
+	# kill volumes
+	[ "$kern_ubivol" ] && ubirmvol /dev/$ubidev -N $CI_KERNPART || true
+	[ "$root_ubivol" ] && ubirmvol /dev/$ubidev -N $CI_ROOTPART || true
+	[ "$data_ubivol" ] && ubirmvol /dev/$ubidev -N rootfs_data || true
+
+	# update kernel
+	if [ "$has_kernel" = "1" ]; then
+		if ! ubimkvol /dev/$ubidev -N $CI_KERNPART -s $kernel_length; then
+			echo "cannot create kernel volume"
+			return 1;
+		fi
+	fi
+
+	# update rootfs
+	local root_size_param
+	if [ "$rootfs_type" = "ubifs" ]; then
+		root_size_param="-m"
+	else
+		root_size_param="-s $rootfs_length"
+	fi
+	if ! ubimkvol /dev/$ubidev -N $CI_ROOTPART $root_size_param; then
+		echo "cannot create rootfs volume"
+		return 1;
+	fi
+
+	# create rootfs_data for non-ubifs rootfs
+	if [ "$rootfs_type" != "ubifs" ]; then
+		if ! ubimkvol /dev/$ubidev -N rootfs_data -m; then
+			echo "cannot initialize rootfs_data volume"
+			return 1
+		fi
+	fi
+	sync
+	return 0
+}
+
+nand_do_upgrade_success() {
+	local conf_tar="/tmp/sysupgrade.tgz"
+
+	sync
+	[ -f "$conf_tar" ] && nand_restore_config "$conf_tar"
+	echo "sysupgrade successful"
+	umount -a
+	reboot -f
+}
+
+# Flash the UBI image to MTD partition
+nand_upgrade_ubinized() {
+	local ubi_file="$1"
+	local mtdnum="$(find_mtd_index "$CI_UBIPART")"
+
+	[ ! "$mtdnum" ] && {
+		CI_UBIPART="rootfs"
+		mtdnum="$(find_mtd_index "$CI_UBIPART")"
+	}
+
+	if [ ! "$mtdnum" ]; then
+		echo "cannot find mtd device $CI_UBIPART"
+		umount -a
+		reboot -f
+	fi
+
+	local mtddev="/dev/mtd${mtdnum}"
+	ubidetach -p "${mtddev}" || true
+	sync
+	ubiformat "${mtddev}" -y -f "${ubi_file}"
+	ubiattach -p "${mtddev}"
+	nand_do_upgrade_success
+}
+
+# Write the UBIFS image to UBI volume
+nand_upgrade_ubifs() {
+	local rootfs_length=`(cat $1 | wc -c) 2> /dev/null`
+
+	nand_upgrade_prepare_ubi "$rootfs_length" "ubifs" "0" "0"
+
+	local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+	local root_ubivol="$(nand_find_volume $ubidev $CI_ROOTPART)"
+	ubiupdatevol /dev/$root_ubivol -s $rootfs_length $1
+
+	nand_do_upgrade_success
+}
+
+nand_upgrade_tar() {
+	local tar_file="$1"
+	local kernel_mtd="$(find_mtd_index $CI_KERNPART)"
+
+	local board_dir=$(tar tf $tar_file | grep -m 1 '^sysupgrade-.*/$')
+	board_dir=${board_dir%/}
+
+	local kernel_length=`(tar xf $tar_file ${board_dir}/kernel -O | wc -c) 2> /dev/null`
+	local rootfs_length=`(tar xf $tar_file ${board_dir}/root -O | wc -c) 2> /dev/null`
+
+	local rootfs_type="$(identify_tar "$tar_file" ${board_dir}/root)"
+
+	local has_kernel=1
+	local has_env=0
+
+	[ "$kernel_length" != 0 -a -n "$kernel_mtd" ] && {
+		tar xf $tar_file ${board_dir}/kernel -O | mtd write - $CI_KERNPART
+	}
+	[ "$kernel_length" = 0 -o ! -z "$kernel_mtd" ] && has_kernel=0
+
+	nand_upgrade_prepare_ubi "$rootfs_length" "$rootfs_type" "$has_kernel" "$has_env"
+
+	local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
+	[ "$has_kernel" = "1" ] && {
+		local kern_ubivol="$(nand_find_volume $ubidev $CI_KERNPART)"
+		tar xf $tar_file ${board_dir}/kernel -O | \
+			ubiupdatevol /dev/$kern_ubivol -s $kernel_length -
+	}
+
+	local root_ubivol="$(nand_find_volume $ubidev $CI_ROOTPART)"
+	tar xf $tar_file ${board_dir}/root -O | \
+		ubiupdatevol /dev/$root_ubivol -s $rootfs_length -
+
+	nand_do_upgrade_success
+}
+
+# Recognize type of passed file and start the upgrade process
+nand_do_upgrade() {
+	local file_type=$(identify $1)
+
+	if type 'platform_nand_pre_upgrade' >/dev/null 2>/dev/null; then
+		platform_nand_pre_upgrade "$1"
+	fi
+
+	[ ! "$(find_mtd_index "$CI_UBIPART")" ] && CI_UBIPART="rootfs"
+
+	case "$file_type" in
+		"ubi")		nand_upgrade_ubinized $1;;
+		"ubifs")	nand_upgrade_ubifs $1;;
+		*)		nand_upgrade_tar $1;;
+	esac
+}
+
+# Check if passed file is a valid one for NAND sysupgrade. Currently it accepts
+# 3 types of files:
+# 1) UBI - should contain an ubinized image, header is checked for the proper
+#    MAGIC
+# 2) UBIFS - should contain UBIFS partition that will replace "rootfs" volume,
+#    header is checked for the proper MAGIC
+# 3) TAR - archive has to include "sysupgrade-BOARD" directory with a non-empty
+#    "CONTROL" file (at this point its content isn't verified)
+#
+# You usually want to call this function in platform_check_image.
+#
+# $(1): board name, used in case of passing TAR file
+# $(2): file to be checked
+nand_do_platform_check() {
+	local board_name="$1"
+	local tar_file="$2"
+	local control_length=`(tar xf $tar_file sysupgrade-$board_name/CONTROL -O | wc -c) 2> /dev/null`
+	local file_type="$(identify $2)"
+
+	[ "$control_length" = 0 -a "$file_type" != "ubi" -a "$file_type" != "ubifs" ] && {
+		echo "Invalid sysupgrade file."
+		return 1
+	}
+
+	return 0
+}

package/base-files/files/lib/upgrade/stage2

@@ -0,0 +1,137 @@
+#!/bin/sh
+
+. /lib/functions.sh
+. /lib/functions/system.sh
+
+export IMAGE="$1"
+COMMAND="$2"
+
+export INTERACTIVE=0
+export VERBOSE=1
+export CONFFILES=/tmp/sysupgrade.conffiles
+
+RAMFS_COPY_BIN=		# extra programs for temporary ramfs root
+RAMFS_COPY_DATA=	# extra data files
+
+include /lib/upgrade
+
+
+supivot() { # <new_root> <old_root>
+	/bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
+	mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
+	/bin/mount -o noatime,move /proc $1/proc && \
+	pivot_root $1 $1$2 || {
+		/bin/umount -l $1 $1
+		return 1
+	}
+
+	/bin/mount -o noatime,move $2/sys /sys
+	/bin/mount -o noatime,move $2/dev /dev
+	/bin/mount -o noatime,move $2/tmp /tmp
+	/bin/mount -o noatime,move $2/overlay /overlay 2>&-
+	return 0
+}
+
+switch_to_ramfs() {
+	for binary in \
+		/bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount	\
+		pivot_root mount_root reboot sync kill sleep		\
+		md5sum hexdump cat zcat bzcat dd tar			\
+		ls basename find cp mv rm mkdir rmdir mknod touch chmod \
+		'[' printf wc grep awk sed cut				\
+		mtd partx losetup mkfs.ext4				\
+		ubiupdatevol ubiattach ubiblock ubiformat		\
+		ubidetach ubirsvol ubirmvol ubimkvol			\
+		snapshot snapshot_tool					\
+		$RAMFS_COPY_BIN
+	do
+		local file="$(which "$binary" 2>/dev/null)"
+		[ -n "$file" ] && install_bin "$file"
+	done
+	install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh /lib/upgrade/do_stage2 /usr/share/libubox/jshn.sh $RAMFS_COPY_DATA
+
+	[ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
+
+	supivot $RAM_ROOT /mnt || {
+		echo "Failed to switch over to ramfs. Please reboot."
+		exit 1
+	}
+
+	/bin/mount -o remount,ro /mnt
+	/bin/umount -l /mnt
+
+	grep /overlay /proc/mounts > /dev/null && {
+		/bin/mount -o noatime,remount,ro /overlay
+		/bin/umount -l /overlay
+	}
+}
+
+kill_remaining() { # [ <signal> [ <loop> ] ]
+	local loop_limit=10
+
+	local sig="${1:-TERM}"
+	local loop="${2:-0}"
+	local run=true
+	local stat
+	local proc_ppid=$(cut -d' ' -f4  /proc/$$/stat)
+
+	echo -n "Sending $sig to remaining processes ... "
+
+	while $run; do
+		run=false
+		for stat in /proc/[0-9]*/stat; do
+			[ -f "$stat" ] || continue
+
+			local pid name state ppid rest
+			read pid name state ppid rest < $stat
+			name="${name#(}"; name="${name%)}"
+
+			# Skip PID1, our parent, ourself and our children
+			[ $pid -ne 1 -a $pid -ne $proc_ppid -a $pid -ne $$ -a $ppid -ne $$ ] || continue
+
+			local cmdline
+			read cmdline < /proc/$pid/cmdline
+
+			# Skip kernel threads
+			[ -n "$cmdline" ] || continue
+
+			echo -n "$name "
+			kill -$sig $pid 2>/dev/null
+
+			[ $loop -eq 1 ] && run=true
+		done
+
+		let loop_limit--
+		[ $loop_limit -eq 0 ] && {
+			echo
+			echo "Failed to kill all processes."
+			exit 1
+		}
+	done
+	echo
+}
+
+indicate_upgrade
+
+killall -9 telnetd
+killall -9 dropbear
+killall -9 ash
+
+kill_remaining TERM
+sleep 3
+kill_remaining KILL 1
+
+sleep 1
+
+
+if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
+	platform_pre_upgrade "$IMAGE"
+fi
+
+if [ -n "$(rootfs_type)" ]; then
+	echo "Switching to ramdisk..."
+	switch_to_ramfs
+fi
+
+# Exec new shell from ramfs
+exec /bin/busybox ash -c "$COMMAND"