#!/bin/sh

################################################################################
#      This file is part of OpenELEC - http://www.openelec.tv
#      Copyright (C) 2009-2014 Stephan Raue (stephan@openelec.tv)
#      Copyright (C) 2010-2011 Roman Weber (roman@openelec.tv)
#      Copyright (C) 2012 Yann Cézard (eesprit@free.fr)
#
#  OpenELEC is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 2 of the License, or
#  (at your option) any later version.
#
#  OpenELEC is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with OpenELEC.  If not, see <http://www.gnu.org/licenses/>.
################################################################################

  # create directories
  /bin/busybox mkdir -p /dev
  /bin/busybox mkdir -p /proc
  /bin/busybox mkdir -p /sys
  /bin/busybox mkdir -p /flash
  /bin/busybox mkdir -p /sysroot
  /bin/busybox mkdir -p /storage

  # mount all needed special filesystems
  /bin/busybox mount -t devtmpfs devtmpfs /dev
  /bin/busybox mount -t proc proc /proc
  /bin/busybox mount -t sysfs sysfs /sys

  # set needed variables
  MODULE_DIR=/lib/modules

  UPDATE_DIR=/storage/.update
  UPDATE_KERNEL="KERNEL"
  UPDATE_SYSTEM="SYSTEM"
  IMAGE_KERNEL="KERNEL"
  IMAGE_SYSTEM="SYSTEM"

  BOOT_STEP="start"
  MD5_FAILED="0"
  MD5_NOCHECK="0"
  SIZE_FAILED="0"
  RUN_FSCK="yes"
  RUN_FSCK_DISKS=""

  NBD_DEVS="0"
  FLASH_FREE_MIN="5"

  INSTALLED_MEMORY=`cat /proc/meminfo | grep 'MemTotal:' | awk '{print $2}'`
  SYSTEM_TORAM_LIMIT=1024000

  LIVE="no"

  # hide kernel log messages on console
  echo '1 4 1 7' > /proc/sys/kernel/printk

  # set ondemand up_threshold
  if [ -e /sys/devices/system/cpu/cpufreq/ondemand/up_threshold ] ; then
    echo 50 > /sys/devices/system/cpu/cpufreq/ondemand/up_threshold
  fi

  # run platform_init script if exists
  if [ -f "./platform_init" ]; then
    ./platform_init
  fi

  # clear screen and hide cursor
  clear
  if [ -f /sys/devices/virtual/graphics/fbcon/cursor_blink ] ; then
    echo 0 > /sys/devices/virtual/graphics/fbcon/cursor_blink
  fi

  # parse command line arguments
  for arg in $(cat /proc/cmdline); do
    case $arg in
      BOOT_IMAGE=*)
        IMAGE_KERNEL="${arg#*=}"
        ;;
      SYSTEM_IMAGE=*)
        IMAGE_SYSTEM="${arg#*=}"
        ;;
      boot=*)
        boot="${arg#*=}"
        case $boot in
          ISCSI=*|NBD=*|NFS=*)
            UPDATE_DISABLED=yes
            FLASH_NETBOOT=yes
            ;;
          /dev/*|LABEL=*|UUID=*)
            RUN_FSCK_DISKS="$RUN_FSCK_DISKS $boot"
            ;;
        esac
        ;;
      disk=*)
        disk="${arg#*=}"
        case $disk in
          ISCSI=*|NBD=*|NFS=*)
            STORAGE_NETBOOT=yes
            ;;
          /dev/*|LABEL=*|UUID=*)
            RUN_FSCK_DISKS="$RUN_FSCK_DISKS $disk"
            ;;
        esac
        ;;
      wol_mac=*)
        wol_mac="${arg#*=}"
        ;;
      wol_wait=*)
        wol_wait="${arg#*=}"
        ;;
      textmode)
        INIT_UNIT="--unit=textmode.target"
        ;;
      installer)
        INIT_UNIT="--unit=installer.target"
        ;;
      debugging)
        DEBUG=yes
        ;;
      progress)
        PROGRESS=yes
        INIT_ARGS="$INIT_ARGS --show-status=1"
        ;;
      nofsck)
        RUN_FSCK=no
        ;;
      nosplash)
        SPLASH=no
        ;;
      noram)
        SYSTEM_TORAM=no
        ;;
      live)
        LIVE=yes
        ;;
      overlay)
        OVERLAY=yes
        ;;
      break=*)
        BREAK="${arg#*=}"
        ;;
    esac
  done

  if test "$DEBUG" = "yes"; then
    exec 3>&1
  else
    exec 3>/dev/null
  fi
  SILENT_OUT=3

  progress() {
    if test "$PROGRESS" = "yes"; then
      echo "### $1 ###"
    fi
  }

  debug_shell() {
    echo "### Starting debugging shell... type  exit  to quit ###"

    # show cursor
    echo 0 > /sys/devices/virtual/graphics/fbcon/cursor_blink

    sh </dev/tty1 >/dev/tty1 2>&1
  }

  error() {
    # Display fatal error message
    # $1:action which caused error, $2:message
    echo "*** Error in $BOOT_STEP: $1: $2 ***"
    debug_shell
  }

  break_after() {
    # Start debug shell after boot step $1
    case $BREAK in
      all|*$1*)
        debug_shell
        ;;
    esac
  }

  # Mount handlers
  # All handlers take the following parameters:
  # $1:target, $2:mountpoint, $3:mount options, [$4:fs type]

  mount_common() {
    # Common mount handler, handles block devices and filesystem images
    MOUNT_OPTIONS="-o $3"
    [ -n "$4" ] && MOUNT_OPTIONS="-t $4 $MOUNT_OPTIONS"

    for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15; do
      ERR_ENV=1

      mount $MOUNT_OPTIONS $1 $2 >&$SILENT_OUT 2>&1
      [ "$?" -eq "0" ] && ERR_ENV=0 && break

      usleep 1000000
    done
    [ "$ERR_ENV" -ne "0" ] && error "mount_common" "Could not mount $1"
  }

  get_iscsistart_options() {
    # Convert kernel commandline ISCSI= options to iscsistart options
    IFS_SAVE="$IFS"
    IFS=,

    for arg in $1; do
      val="${arg#*=}"
      case "$arg" in
        iscsi_initiator=*)
          option="-i"
          ;;
        iscsi_target_name=*)
          option="-t"
          ;;
        iscsi_target_ip=*)
          option="-a"
          ;;
        iscsi_target_port=*)
          option="-p"
          ;;
        iscsi_target_group=*)
          option="-g"
          ;;
        iscsi_username=*)
          option="-u"
          ;;
        iscsi_password=*)
          option="-w"
          ;;
        iscsi_in_username=*)
          option="-U"
          ;;
        iscsi_in_password=*)
          option="-W"
          ;;
      esac
      echo "$option $val"
    done

    IFS="$IFS_SAVE"
  }

  mount_iscsi() {
    # Mount iSCSI target
    ISCSI_DEV="${1##*,}"
    ISCSI_OPTIONS="${1%,*}"

    if [ ! -f "/sbin/iscsistart" ]; then
      error "iscsistart" "iSCSI support not available"
    fi

    if [ "$ISCSI_OPTIONS" = "auto" ]; then
      progress "Network configuration based on iBFT"
      /sbin/iscsistart -N >&$SILENT_OUT 2>&1 || \
        error "iscsistart" "Unable to configure network"
      progress "iSCSI auto connect based on iBFT"
      /sbin/iscsistart -b >&$SILENT_OUT 2>&1 || \
        error "iscsistart" "Unable to auto connect"
    else
      /sbin/iscsistart $(get_iscsistart_options "$ISCSI_OPTIONS") >&$SILENT_OUT 2>&1 || \
        error "iscsistart" "Unable to connect to ISCSI target"
    fi

    mount_common "$ISCSI_DEV" "$2" "$3" "$4"
  }

  mount_nbd() {
  # Mount NBD device
    NBD_SERVER="${1%%:*}"
    NBD_PORT="${1#*:}"
    NBD_DEV="/dev/nbd$NBD_DEVS"

    nbd-client $NBD_SERVER $NBD_PORT $NBD_DEV >&$SILENT_OUT 2>&1 || \
      error "nbd-client" "Could not connect to NBD server $1"

    mount_common "$NBD_DEV" "$2" "$3" "$4"

    NBD_DEVS=$(( ${NBD_DEVS} + 1 ))
  }

  mount_nfs() {
    # Mount NFS export
    NFS_EXPORT="${1%%,*}"
    NFS_OPTIONS="${1#*,}"

    [ "$NFS_OPTIONS" = "$1" ] && NFS_OPTIONS=

    mount_common "$NFS_EXPORT" "$2" "$3,nolock,soft,timeo=3,retrans=2,rsize=32768,wsize=32768,$NFS_OPTIONS" "nfs"
  }

  mount_ubifs() {
    mount_common "$1" "$2" "$3" "ubifs"
  }

  mount_part() {
    # Mount a local or network filesystem
    # $1:[TYPE=]target, $2:mountpoint, $3:mount options, [$4:fs type]
    progress "mount filesystem $1 ..."

    MOUNT_TARGET="${1#*=}"
    case $1 in
      /dev/ubi*)
        MOUNT_CMD="mount_ubifs"
        MOUNT_TARGET="$1"
        RUN_FSCK="no"
        ;;
      LABEL=*|UUID=*|/*)
        MOUNT_CMD="mount_common"
        MOUNT_TARGET="$1"
        ;;
      ISCSI=*)
        MOUNT_CMD="mount_iscsi"
        ;;
      NBD=*)
        MOUNT_CMD="mount_nbd"
        ;;
      NFS=*)
        MOUNT_CMD="mount_nfs"
        ;;
      *)
        error "mount_part" "Unknown filesystem $1"
        ;;
    esac
    $MOUNT_CMD "$MOUNT_TARGET" "$2" "$3" "$4"
  }

  update_file() {
    if [ -f "$UPDATE_DIR/$2" -a -f "$3" ]; then
      echo "updating $1..."
      mount -o remount,rw /flash
      mv $UPDATE_DIR/$2 $3 2>/dev/null
      # loopback file needs writable /flash all the time
      if [ "${disk%%=*}" != "FILE" ]; then
        mount -o remount,ro /flash
      fi
      sync
    fi
  }

  update_partition() {
    if [ -f "$UPDATE_DIR/$2" -a -b "$3" ]; then
      echo "updating $1..."
      dd if="$UPDATE_DIR/$2" of="$3"
     fi
   }

  update_bootloader() {
    export BOOT_ROOT="/flash"
    export SYSTEM_ROOT="/sysroot"

    mount_part "/flash/$IMAGE_SYSTEM" "/sysroot" "ro,loop"

    if [ -f $SYSTEM_ROOT/usr/share/bootloader/update.sh ]; then
      echo "updating Bootloader..."
      sh $SYSTEM_ROOT/usr/share/bootloader/update.sh
      sync
    fi

    umount /sysroot
  }

  load_modules() {
    progress "Loading kernel modules"

    [ ! -f "/etc/modules" ] && return
    for module in $(cat /etc/modules); do
      progress "Loading kernel module $module"
      insmod "$MODULE_DIR/$module.ko" || \
        progress "... Failed to load kernel module $module, skipping"
    done
  }

  load_splash() {
    if [ ! "$SPLASH" = "no" ]; then
      progress "Loading bootsplash"

      SPLASHIMAGE="/splash/splash-full.png"

      # load uvesafb module if needed
      if [ -f "$MODULE_DIR/uvesafb.ko" -a ! -e /dev/fb0 ]; then
        progress "Loading kernel module uvesafb.ko"
        insmod "$MODULE_DIR/uvesafb.ko" || \
          progress "... Failed to load kernel module uvesafb, skipping"

        # set framebuffer to a default resolution (1024x768-32)
        if [ ! "$SWITCH_FRAMEBUFFER" = "no" ]; then
          fbset -g 1024 768 1024 768 32
          SPLASHIMAGE="/splash/splash-1024.png"
        fi
      fi

      if [ -e /dev/fb0 ]; then
        # load splash
        if [ -f /flash/oemsplash.png ]; then
          SPLASHIMAGE="/flash/oemsplash.png"
        elif [ -f /splash/splash.conf ]; then
          . /splash/splash.conf
        fi

        ply-image $SPLASHIMAGE > /dev/null 2>&1
      fi
    fi
  }

  do_reboot() {
    echo "System reboots now..."

    # syncing filesystem
      sync

    # unmount filesystems
      if /bin/busybox mountpoint -q /flash ; then
         /bin/busybox umount /flash
      fi

      if /bin/busybox mountpoint -q /storage ; then
        /bin/busybox umount /storage
      fi

    usleep 2000000
    /bin/busybox reboot
  }

  force_fsck() {
    echo "Filesystem corruption has been detected"
    echo "To prevent an automatic repair attempt continuing"
    echo "press any key or power off your system within the next 120 seconds"
    echo ""
    read -t120 -n1
    # The exit status is 0 if input is available
    # The exit status is greater than 128 if the timeout is exceeded
    if [ "$?" -ne "0" -o "$?" -gt "128" ] ; then
      echo "repairing filesystem.."
      echo ""
      /sbin/fsck -T -M -y $RUN_FSCK_DISKS
      FSCK_RET="$?"
      if [ "$(( $FSCK_RET & 8 ))" = 8 ] ; then
        # fubar
        echo "Forced fsck failed. Your system is broken beyond repair"
        echo "Please re-install OpenELEC"
        echo ""
        echo "Press enter to shutdown now"
        echo ""
        read fubar
        poweroff
      fi
      do_reboot
    else
      echo "shutting down..."
      sleep 5
      sync
      poweroff
    fi
  }

  check_disks() {
    if [ "$RUN_FSCK" = "yes" -a -n "$RUN_FSCK_DISKS" ]; then
      progress "Checking disk(s): $RUN_FSCK_DISKS"
        /sbin/fsck -T -M -p -a $RUN_FSCK_DISKS > /dev/null 2>&1
        FSCK_RET="$?"

        # FSCK_RET is the bit-wise OR of the exit codes for each filesystem that is checked.
        if [ "$(( $FSCK_RET & 4 ))" = 4 ] ; then
          # errors left
          force_fsck
        elif [ "$(( $FSCK_RET & 2 ))" = 2 ] ; then
          # reboot needed
          echo "filesystem repaired, reboot needed..."
          do_reboot
        elif [ "$(( $FSCK_RET & 1 ))" = 1 ] ; then
          # filesystem errors corrected
          progress "filesystem errors corrected , continuing..."
        elif [ "$(( $FSCK_RET & 0 ))" = 0 ] ; then
          # no errors found
          progress "no filesystem errors found, continuing..."
        fi
    fi
  }

  wakeonlan() {
    if [ "$STORAGE_NETBOOT" = "yes" ]; then
      wol_ip=${disk%:*}
      wol_ip=${wol_ip#*=}
    elif [ "$FLASH_NETBOOT" = "yes" ]; then
      wol_ip=${boot%:*}
      wol_ip=${wol_ip#*=}
    else
      return 0
    fi

    if [ -n "$wol_ip" -a -n "$wol_mac" -a -n "$wol_wait" ]; then
      progress "Sending Magic Packet (WOL) if needed"

      if ! ping -q -c 2 "$wol_ip" &>/dev/null; then
        ether-wake "$wol_mac"
        sleep "$wol_wait"
      fi
    fi
  }

  mount_flash() {
    progress "Mounting flash"

    wakeonlan

    mount_part "$boot" "/flash" "ro,noatime"
  }

  mount_storage() {
    progress "Mounting storage"

    if [ "$LIVE" = "yes" ]; then
      # mount tmpfs and exit early. disk=xx is not allowed in live mode
      mount -t tmpfs none /storage
      return
    fi

    wakeonlan

    if [ -n "$disk" ]; then
      if [ -n "$OVERLAY" ]; then
        OVERLAY_DIR=`cat /sys/class/net/eth0/address | tr -d :`

        mount_part "$disk" "/storage" "rw,noatime"
        mkdir -p /storage/$OVERLAY_DIR
        umount /storage

        # split $disk into $target,$options so we can append $OVERLAY_DIR
        options="${disk#*,}"
        target="${disk%%,*}"
        if [ "$options" = "$disk" ]; then
          disk="$target/$OVERLAY_DIR"
        else
          disk="$target/$OVERLAY_DIR,$options"
        fi
      fi
      mount_part "$disk" "/storage" "rw,noatime"
    else
      # /storage should always be writable
      mount -t tmpfs none /storage
    fi
  }

  check_update() {
    progress "Checking for updates"

    UPDATE_TAR=`ls -1 "$UPDATE_DIR"/*.tar 2>/dev/null | head -n 1`
    if [ -f "$UPDATE_DIR/$UPDATE_KERNEL" -a -f "$UPDATE_DIR/$UPDATE_SYSTEM" -o -f "$UPDATE_TAR" ] ; then
      if [ "$UPDATE_DISABLED" = "yes" ] ; then
        rm -rf $UPDATE_DIR/[0-9a-zA-Z]* &>/dev/null
        echo "Updating not supported on netboot. normal startup in 10s..."
        sync
        usleep 10000000
        return 0
      fi

      # check for .tar
      if [ -f "$UPDATE_TAR" ] ; then
        echo "Found new .tar archive. extracting..."
        mkdir -p $UPDATE_DIR/.tmp &>/dev/null
        tar -xf "$UPDATE_TAR" -C $UPDATE_DIR/.tmp &>/dev/null
        mv $UPDATE_DIR/.tmp/*/target/* $UPDATE_DIR &>/dev/null
        rm -f "$UPDATE_TAR" &>/dev/null
        rm -rf $UPDATE_DIR/.tmp &>/dev/null
        sync
        if [ ! -f "$UPDATE_DIR/$UPDATE_KERNEL" -o ! -f "$UPDATE_DIR/$UPDATE_SYSTEM" ] ; then
          echo "missing ${UPDATE_KERNEL} or ${UPDATE_SYSTEM}... normal startup in 10s"
          sync
          usleep 10000000
          return 0
        fi
      fi

      if [ -f "$UPDATE_DIR/.nocheck" ] ; then
        MD5_NOCHECK="1"
      fi

      # check md5 sums if .nocheck doesn't exist
      if [ "$MD5_NOCHECK" -eq "0" ] ; then
        if [ -f "$UPDATE_DIR/${UPDATE_KERNEL}.md5" -a -f "$UPDATE_DIR/${UPDATE_SYSTEM}.md5" ] ; then
          # *.md5 size-check
          if [ ! -s "$UPDATE_DIR/${UPDATE_KERNEL}.md5" -o ! -s "$UPDATE_DIR/${UPDATE_SYSTEM}.md5" ] ; then
            echo "zero-sized .md5 file..."
            MD5_FAILED="1"
          else
            sed  -i 's#target#/storage/.update#g' "$UPDATE_DIR/${UPDATE_KERNEL}.md5"
            sed  -i 's#target#/storage/.update#g' "$UPDATE_DIR/${UPDATE_SYSTEM}.md5"

            echo "Checking ${UPDATE_KERNEL}.md5..."
            md5sum -c "$UPDATE_DIR/${UPDATE_KERNEL}.md5" || MD5_FAILED="1"

            echo "Checking ${UPDATE_SYSTEM}.md5..."
            md5sum -c "$UPDATE_DIR/${UPDATE_SYSTEM}.md5" || MD5_FAILED="1"
          fi
        else
          echo "missing ${UPDATE_KERNEL}.md5 or ${UPDATE_SYSTEM}.md5..."
          MD5_FAILED="1"
        fi
      fi

      # get sizes
      FLASH_FREE=$(df /flash/ | awk '/[0-9]%/{print $4}')
      FLASH_FREE=$(( $FLASH_FREE * 1024 ))

      OLD_KERNEL="0"
      if [ ! -b $IMAGE_KERNEL ]; then
        OLD_KERNEL=$(stat -t "/flash/$IMAGE_KERNEL" | awk '{print $2}')
      fi

      OLD_SYSTEM=$(stat -t "/flash/$IMAGE_SYSTEM" | awk '{print $2}')
      NEW_KERNEL=$(stat -t "$UPDATE_DIR/$UPDATE_KERNEL" | awk '{print $2}')
      NEW_SYSTEM=$(stat -t "$UPDATE_DIR/$UPDATE_SYSTEM" | awk '{print $2}')

      # old KERNEL+SYSTEM+free space - new KERNEL+SYSTEM must be higher then 5MB
      # at least 5MB free after update

      TMP_SIZE=$(($OLD_KERNEL+$OLD_SYSTEM+$FLASH_FREE-$NEW_KERNEL-$NEW_SYSTEM))
      FLASH_FREE_MIN=$(($FLASH_FREE_MIN*1024*1024))

      if [ $TMP_SIZE -ge $FLASH_FREE_MIN ]; then
        echo "Checking size: OK"
      else
        echo "Checking size: FAILED"
        SIZE_FAILED="1"
      fi

      # update if size check is ok
      if [ "$SIZE_FAILED" -eq "0" ] ; then
        # update if md5 check is ok or .nocheck exists
        if [ "$MD5_FAILED" -eq "0" -o "$MD5_NOCHECK" -eq "1" ] ; then
          if [ -b $IMAGE_KERNEL ]; then
            update_partition "Kernel" "$UPDATE_KERNEL" "$IMAGE_KERNEL"
          else
            update_file "Kernel" "$UPDATE_KERNEL" "/flash/$IMAGE_KERNEL"
          fi
          update_file "System" "$UPDATE_SYSTEM" "/flash/$IMAGE_SYSTEM"
          update_bootloader
          rm -rf $UPDATE_DIR/[0-9a-zA-Z]* &>/dev/null
          do_reboot
        else
          rm -rf $UPDATE_DIR/[0-9a-zA-Z]* &>/dev/null
          echo "md5 check failed. normal startup in 30s..."
          sync
          usleep 30000000
        fi
      else
        rm -rf $UPDATE_DIR/[0-9a-zA-Z]* &>/dev/null
        echo "size check failed. normal startup in 30s..."
        sync
        usleep 30000000
      fi
    fi
  }

  prepare_sysroot() {
    progress "Preparing system"

    if [ "$SYSTEM_TORAM" = "no" -o "$INSTALLED_MEMORY" -lt "$SYSTEM_TORAM_LIMIT" ]; then
      mount_part "/flash/$IMAGE_SYSTEM" "/sysroot" "ro,loop"
    else
      cp /flash/$IMAGE_SYSTEM /dev/$IMAGE_SYSTEM
      mount_part "/dev/$IMAGE_SYSTEM" "/sysroot" "ro,loop"
    fi

    mount --move /flash /sysroot/flash
    mount --move /storage /sysroot/storage

    if [ ! -d "/sysroot/lib/modules/$(uname -r)/" -a -f "/sysroot/usr/lib/systemd/systemd" ]; then
      echo ""
      echo "NEVER TOUCH boot= in extlinux.conf / cmdline.txt"
      echo "if you dont know what you are doing"
      echo ""
      echo "your installation is now broken"
      echo ""
      echo "normal boot in 60s..."
      usleep 60000000
    fi


    [ -f "/sysroot/usr/lib/systemd/systemd" ] || error "final_check" "Could not find system."
  }

  if [ "${boot%%=*}" = "FILE" ]; then
    error "check arguments" "boot argument can't be FILE type..."
  fi

  # main boot sequence
  for BOOT_STEP in \
      load_modules \
      check_disks \
      mount_flash \
      load_splash \
      mount_storage \
      check_update \
      prepare_sysroot; do
    $BOOT_STEP
    [ -n "$DEBUG" ] && break_after $BOOT_STEP
  done

  BOOT_STEP=final

  # log if booting from usb / removable storage
  STORAGE=$(cat /proc/mounts | grep " /sysroot/storage " | awk '{print $1}' | awk -F '/' '{print $3}')
  FLASH=$(cat /proc/mounts | grep " /sysroot/flash " | awk '{print $1}' | awk -F '/' '{print $3}')
  for i in $STORAGE $FLASH ; do
    if [ -n "$i" ] ; then
      removable="/sys/class/block/*/$i/../removable"
      if [ -e $removable ] ; then
        if [ "$(cat $removable 2>/dev/null)" = "1" ] ; then
          echo "### BIG FAT WARNING" > /dev/kmsg
          echo "### $i is removable. suspend/resume may not work" > /dev/kmsg
        fi
      fi
    fi
  done
  # move some special filesystems
  /bin/busybox mount --move /dev /sysroot/dev
  /bin/busybox mount --move /proc /sysroot/proc
  /bin/busybox mount --move /sys /sysroot/sys

  # tell OE settings addon to disable updates
  if [ "$UPDATE_DISABLED" = "yes" ] ; then
    echo "" > /sysroot/dev/.update_disabled
  fi
  # swap can not be used over nfs.(see scripts/mount-swap)
  if [ "$STORAGE_NETBOOT" = "yes" ] ; then
    echo "" > /sysroot/dev/.storage_netboot
  fi

  if [ -f /sysroot/storage/.please_resize_me ] ; then
    INIT_UNIT="--unit=fs-resize.target"
  fi

  BACKUP_FILE=`ls -1 /sysroot/storage/.restore/??????????????.tar 2>/dev/null | head -n 1`
  if [ -f "$BACKUP_FILE" ] ; then
    INIT_UNIT="--unit=backup-restore.target"
  fi

  if [ -f /sysroot/storage/.cache/reset_oe -o -f /sysroot/storage/.cache/reset_xbmc ] ; then
    INIT_UNIT="--unit=factory-reset.target"
  fi
  # switch to new sysroot and start real init
  exec /bin/busybox switch_root /sysroot /usr/lib/systemd/systemd $INIT_ARGS $INIT_UNIT

  error "switch_root" "Error in initramfs. Could not switch to new root"