#!/bin/sh

################################################################################
#      This file is part of OpenELEC - http://www.openelec.tv
#      Copyright (C) 2009-2014 Stephan Raue (stephan@openelec.tv)
#
#  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/>.
################################################################################

# some DOCs:

# list devices:
# cat /proc/partitions | sed -n "s/\ *[0-9][0-9]*\ *[0-9][0-9]*\ *[0-9][0-9]*\ \([a-z]*\)$/\1/p"

# list all partitionnumbers from /dev/sda:
# parted -m /dev/sda print |grep -v ^/dev |grep -v ^BYT | cut -f1 -d ":"

# list device data from /dev/sda:
# parted -m /dev/sda print |grep /dev/sda

# list mounted partitions:
# mount |grep ^/dev

# list modelnumber:
# parted -m /dev/sda print |grep /dev/sda | cut -f7 -d ":" | sed "s/;//"
# list size:
# parted -m /dev/sda print |grep /dev/sda | cut -f2 -d ":"

# exclude mounted partitions
# for i in `cat /proc/mounts | grep ^/dev/ | cut -f1 -d " " | sed "s/[0-9]//"`; do TEST="$TEST `echo "| grep -v $i"`"; done

# Interpret embedded "\Z" sequences in the dialog text by the following
# character, which tells dialog to set colors or video attributes: 0 through 7
# are the ANSI used in curses: black, red, green, yellow, blue, magenta, cyan
# and white respectively. Bold is set by 'b', reset by 'B'. Reverse is set
# by 'r', reset by 'R'. Underline is set by 'u', reset by 'U'. The settings are
# cumulative, e.g., "\Zb\Z1" makes the following text bold (perhaps bright)
# red. Restore normal settings with "\Zn".

# disable Ctrl+C - can be very dangerous
trap '' 2

[ -f /etc/installer.conf ] && . /etc/installer.conf || exit 0

dbglg() {
  # Acts just like echo cmd, with automatic redirection

  echo "" >> $LOGFILE
  echo "###################################################################" >> $LOGFILE
  echo "# $@" >> $LOGFILE
  echo "###################################################################" >> $LOGFILE
  echo "" >> $LOGFILE
}

get_device_unmount() {
  # get all unmounted devices
  # usage: get_devices_unmount
  # uses:     -
  # provides: DEVICES

  DEVICES=""
  DEVICES=$(parted -s -m -l 2>/dev/null | grep -E '^/dev/sd|^/dev/mmcblk|^/dev/nvme' | grep -E -v '.?rpmb|.?boot?' | cut -f1 -d ":")

  for i in $(cat /proc/mounts | grep -E '^/dev/sd' | cut -f1 -d " " | sed "s/[0-9].*$//"); do
    DEVICES=$(echo $DEVICES |sed -e "s|$i||")
  done

  for i in $(cat /proc/mounts | grep -E '^/dev/mmcblk' | cut -f1 -d " " | sed "s/p.*$//"); do
    DEVICES=$(echo $DEVICES |sed -e "s|$i||")
  done

  for i in $(cat /proc/mounts | grep -E '^/dev/nvme' | cut -f1 -d " " | sed "s/p.*$//"); do
    DEVICES=$(echo $DEVICES |sed -e "s|$i||")
  done
}

get_partition() {
  # get all partitions of a specifed device
  # usage:    get_partitions /dev/sda
  # uses:     -
  # provides: PARTITIONS

  PARTITIONS=$(parted -s -m $1 print |grep -v ^/dev |grep -v BYT | cut -f1 -d ":")
}

create_device_list() {
  # creates device list to use in menus
  # usage:    create_devices_list
  # uses:     get_device_unmount
  # provides: DEVICE_MODEL, DEVICE_SIZE, DEVICE_LIST, DEVICE_NAME,
  #           DEVICES (get_device_unmount)

  DEVICE_MODEL=""
  DEVICE_SIZE=""
  DEVICE_LIST=""
  DEVICE_NAME=""

  get_device_unmount

  if [ "$DEVICES" = "" ]; then
    msg_no_device
  fi

  for i in $DEVICES; do
    DEVICE_MODEL=$(parted -s $i -m print | grep ^$i | cut -f7 -d ":" | sed "s/;//")
    DEVICE_SIZE=$(parted -s $i -m print | grep ^$i | cut -f2 -d ":")
    DEVICE_NAME=$(echo $DEVICE_MODEL ${DEVICE_SIZE} | sed 's/ /_/g')
    DEVICE_LIST="$DEVICE_LIST $i $DEVICE_NAME"
  done
}

create_partition_list() {
  # get an overview of all partitions of a specified device
  # usage:    create_partition_list /dev/sda
  # uses:     get_partition
  # provides: PARTITION_NUMBER, PARTITION_SIZE, PARTITION_FORMAT,
  #           PARTITION_LIST, PARTITIONS (get_partition)

  PARTITION_NUMBER=""
  PARTITION_SIZE=""
  PARTITION_FORMAT=""
  PARTITION_LIST=""

  get_partition $1

  for partition in $PARTITIONS; do
    PARTITION_NUMBER=$(parted -s -m $1 print |grep -v ^/dev |grep -v BYT | cut -f1 -d ":")
    PARTITION_SIZE=$(parted -s -m $1 print |grep -v ^/dev |grep -v BYT | cut -f4 -d ":")
    PARTITION_FORMAT=$(parted -s -m $1 print |grep -v ^/dev |grep -v BYT | cut -f5 -d ":")
    PARTITION_LIST=" $PARTITION_LIST \n Partition $1$PARTITION_NUMBER Size: $PARTITION_SIZE Format: $PARTITION_FORMAT"
  done
}

do_install_mbr() {
  # show menu

  MSG_TITLE="\Z4[ (RE)INSTALL MBR ]\Zn"
  MSG_MENU="\n Please select where to install MBR.\n\n Please select a device:"
  MSG_CANCEL="Back"

  create_device_list

  dialog --colors --backtitle "$BACKTITLE" --cancel-label "$MSG_CANCEL" \
    --title "$MSG_TITLE" --menu "$MSG_MENU" 20 50 5 \
    $DEVICE_LIST 2> $TMPDIR/device_for_install

  # now we must do everything
  case $? in
    0)
      INSTALL_DEVICE=$(cat "$TMPDIR/device_for_install")

      # installing mbr
      prompt_gpt
      if [ "$GPT" = "1" ]; then
        cat /usr/share/syslinux/gptmbr.bin > $INSTALL_DEVICE
      else
        cat /usr/share/syslinux/mbr.bin > $INSTALL_DEVICE
      fi

      msg_install_ready "Master Boot Record installed on $INSTALL_DEVICE"
      ;;
    1)
      menu_main
      ;;
    255)
      do_poweroff
      ;;
  esac
}

do_install_quick() {
  # show menu
  MSG_TITLE="\Z4[ QUICK INSTALL MENU ]\Zn"
  MSG_MENU="\nUse the up/down arrows to select the correct device.\n\n Please select a device:"
  MSG_CANCEL="Back"
  DIALOG_OPTIONS="--defaultno"

  create_device_list

  dialog --colors --backtitle "$BACKTITLE" --cancel-label "$MSG_CANCEL" \
    $DIALOG_OPTIONS --title "$MSG_TITLE" --menu "$MSG_MENU" 20 50 5 \
    $DEVICE_LIST 2> $TMPDIR/device_for_install

  # now we must do everything
  case $? in
    0)
      INSTALL_DEVICE=$(cat "$TMPDIR/device_for_install")
      INSTALL_DEVICE_FULL=$(echo $DEVICE_LIST | sed "s|.*$INSTALL_DEVICE \([^ ]*\).*|$INSTALL_DEVICE \1|")

      case $INSTALL_DEVICE in
        "/dev/mmcblk"*|"/dev/nvme"*)
          PART1="p1"
          PART2="p2"
          ;;
        *)
          PART1="1"
          PART2="2"
          ;;
      esac

      prompt_gpt
      prompt_backup_unpack

      # check for confirmation (twice!)
      MSG_TITLE="\Z1[ Confirmation before installing ]\Zn"
      MSG_DETAIL="\nIf you continue the target disk will be wiped out:\n\n$INSTALL_DEVICE_FULL\n\n"
      DIALOG_OPTIONS="--defaultno"
      dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" \
        $DIALOG_OPTIONS --yesno "$MSG_DETAIL" 0 0
      if [ $? -ne 0 ]; then
        menu_main
      fi

      MSG_TITLE="\Z1[ Confirmation before installing ]\Zn"
      MSG_DETAIL="\nThis is last chance to abort the installation!\n\nIf you continue the target disk will be wiped out:\n\n$INSTALL_DEVICE_FULL\n\n\n"
      DIALOG_OPTIONS="--defaultno"
      dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" \
        $DIALOG_OPTIONS --yesno "$MSG_DETAIL" 0 0
      if [ $? -ne 0 ]; then
        menu_main
      fi

      # remove all partitions
      msg_progress_install "1" "get all partitions $INSTALL_DEVICE"
      get_partition $INSTALL_DEVICE

      msg_progress_install "5" "wiping disk $INSTALL_DEVICE"
      dd if=/dev/zero of=$INSTALL_DEVICE bs=4096 count=1024

      # create 2 new partitions (first $PARTSIZE_SYSTEM, second rest)
      msg_progress_install "7" "creating label on $INSTALL_DEVICE"
      if [ "$GPT" = "1" ]; then
        parted -s $INSTALL_DEVICE mklabel gpt >> $LOGFILE 2>&1
      else
        parted -s $INSTALL_DEVICE mklabel msdos >> $LOGFILE 2>&1
      fi

      msg_progress_install "9" "writing Master Boot Record on $INSTALL_DEVICE"
      if [ "$GPT" = "1" ]; then
        cat /usr/share/syslinux/gptmbr.bin > $INSTALL_DEVICE
      else
        cat /usr/share/syslinux/mbr.bin > $INSTALL_DEVICE
      fi

      msg_progress_install "10" "creating partition on $INSTALL_DEVICE"
      if [ "$UEFI" = "1" ]; then
        parted -s $INSTALL_DEVICE unit cyl mkpart primary fat32 -- 0 $PARTSIZE_SYSTEM >> $LOGFILE 2>&1
      else
        parted -s $INSTALL_DEVICE unit cyl mkpart primary ext2 -- 0 $PARTSIZE_SYSTEM >> $LOGFILE 2>&1
      fi

      msg_progress_install "13" "creating partition on $INSTALL_DEVICE"
      parted -s $INSTALL_DEVICE unit cyl mkpart primary ext2 -- $PARTSIZE_SYSTEM -2 >> $LOGFILE 2>&1

      msg_progress_install "16" "setup bootflag on partition 1 of $INSTALL_DEVICE"
      parted -s $INSTALL_DEVICE set 1 boot on >> $LOGFILE 2>&1
      if [ "$GPT" = "1" ]; then
        parted -s $INSTALL_DEVICE set 1 legacy_boot on >> $LOGFILE 2>&1
      fi

      msg_progress_install "20" "tell the kernel we have a new partitiontable on $INSTALL_DEVICE"
      partprobe $INSTALL_DEVICE >> $LOGFILE 2>&1

      # create filesystem
      msg_progress_install "23" "creating filesystem on ${INSTALL_DEVICE}1"
      if [ "$UEFI" = "1" ]; then
        mkfs.vfat ${INSTALL_DEVICE}${PART1} >> $LOGFILE 2>&1
      else
        mke2fs -t ext4 -m 0 ${INSTALL_DEVICE}${PART1} >> $LOGFILE 2>&1
      fi

      msg_progress_install "25" "set uuid and disklabel $DISKLABEL_SYSTEM on ${INSTALL_DEVICE}${PART1}"
      if [ "$UEFI" = "1" ]; then
        dosfslabel ${INSTALL_DEVICE}${PART1}  $DISKLABEL_SYSTEM >> $LOGFILE 2>&1
      else
        tune2fs -U random -L $DISKLABEL_SYSTEM  ${INSTALL_DEVICE}${PART1} >> $LOGFILE 2>&1
      fi

      msg_progress_install "28" "creating filesystem on ${INSTALL_DEVICE}${PART2}"
      mke2fs -t ext4 -m 0 ${INSTALL_DEVICE}${PART2} >> $LOGFILE 2>&1

      msg_progress_install "30" "set uuid and disklabel $DISKLABEL_STORAGE on ${INSTALL_DEVICE}${PART2}"
      tune2fs -U random -L $DISKLABEL_STORAGE  ${INSTALL_DEVICE}${PART2} >> $LOGFILE 2>&1

      # mount system partition
      msg_progress_install "35" "creating $TMPDIR/part1"
      mkdir -p $TMPDIR/part1 >> $LOGFILE 2>&1

      msg_progress_install "40" "mounting ${INSTALL_DEVICE}${PART1} to $TMPDIR/part1"
      if [ "$UEFI" = "1" ]; then
        mount -t vfat ${INSTALL_DEVICE}${PART1} $TMPDIR/part1 >> $LOGFILE 2>&1
      else
        mount -t ext4 ${INSTALL_DEVICE}${PART1} $TMPDIR/part1 >> $LOGFILE 2>&1
      fi

      # installing extlinux
      msg_progress_install "50" "installing extlinux to $TMPDIR/part1"
      if [ "$UEFI" = "1" ]; then
        syslinux -i ${INSTALL_DEVICE}${PART1} >> $LOGFILE 2>&1
      else
        extlinux -i $TMPDIR/part1 >> $LOGFILE 2>&1
      fi

      # install system files
      msg_progress_install "60" "installing Kernel"
      cp /flash/KERNEL $TMPDIR/part1 >> $LOGFILE 2>&1

      msg_progress_install "65" "installing System"
      cp /flash/SYSTEM $TMPDIR/part1 >> $LOGFILE 2>&1
      sync

      # configuring bootloader
      msg_progress_install "80" "setup bootloader with boot label = $DISKLABEL_SYSTEM and disk label = $DISKLABEL_STORAGE"
      echo "DEFAULT linux" > $TMPDIR/part1/extlinux.conf
      echo "PROMPT 0" >> $TMPDIR/part1/extlinux.conf
      echo " " >> $TMPDIR/part1/extlinux.conf
      echo "LABEL linux" >> $TMPDIR/part1/extlinux.conf
      echo " KERNEL /KERNEL" >> $TMPDIR/part1/extlinux.conf
      echo " APPEND boot=LABEL=$DISKLABEL_SYSTEM disk=LABEL=$DISKLABEL_STORAGE $EXTLINUX_PARAMETERS quiet" >> $TMPDIR/part1/extlinux.conf
      # uefi boot / hybrid mode
      if [ "$UEFI" = "1" ]; then
        mv $TMPDIR/part1/extlinux.conf $TMPDIR/part1/syslinux.cfg
        mkdir -p $TMPDIR/part1/EFI/BOOT
        cp $TMPDIR/part1/syslinux.cfg $TMPDIR/part1/EFI/BOOT
        cp /usr/share/syslinux/bootx64.efi $TMPDIR/part1/EFI/BOOT
        cp /usr/share/syslinux/ldlinux.e64 $TMPDIR/part1/EFI/BOOT
      fi
      sync

      # umount system partition, remove mountpoint
      msg_progress_install "85" "unmount $TMPDIR/part1"
      umount $TMPDIR/part1 >> $LOGFILE 2>&1

      msg_progress_install "87" "remove $TMPDIR/part1"
      rmdir $TMPDIR/part1 >> $LOGFILE 2>&1

      if [ "$BACKUP_UNPACK" = "1" ]; then
        # mount storage partition
        msg_progress_install "89" "creating $TMPDIR/part2"
        mkdir -p $TMPDIR/part2 >> $LOGFILE 2>&1

        msg_progress_install "90" "mounting ${INSTALL_DEVICE}${PART2} to $TMPDIR/part2"
        mount -t ext4 ${INSTALL_DEVICE}${PART2} $TMPDIR/part2 >> $LOGFILE 2>&1

        msg_progress_install "92" "restoring backup"
        [ -f /flash/backup.tar.bz2 ] && tar -xjf /flash/backup.tar.bz2 -C $TMPDIR/part2 >> $LOGFILE 2>&1
        [ -f /flash/backup.zip ] && unzip -qq /flash/backup.zip -d $TMPDIR/part2 >> $LOGFILE 2>&1
        sync

        # umount system partition, remove mountpoint
        msg_progress_install "97" "unmount $TMPDIR/part2"
        umount $TMPDIR/part2 >> $LOGFILE 2>&1

        msg_progress_install "100" "remove $TMPDIR/part2"
        rmdir $TMPDIR/part2 >> $LOGFILE 2>&1
      fi

      # install complete
      MSG_TITLE="\Z1[ OpenELEC Install Complete ]\Zn"
      MSG_DETAIL="\nYou may now remove the install media and reboot\n"
      dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" --msgbox "$MSG_DETAIL" 6 52

      menu_main
      ;;
    1)
      menu_main
      ;;
    255)
      do_poweroff
      ;;
  esac
}

do_install_custom() {
  # show menu
  MSG_TITLE="\Z4[ REPAIR/UPGRADE MENU ]\Zn"
  MSG_MENU="\nUse the up/down arrows to select the correct partition where you want to overwrite KERNEL and SYSTEM files.\n\n Please select a partition:"
  MSG_CANCEL="Back"
  DIALOG_OPTIONS="--defaultno"

  get_device_unmount

  if [ "$DEVICES" = "" ]; then
    msg_no_device
  fi

  PARTITION_LIST=""
  for device in $DEVICES; do
    get_partition $device
    for partition in $PARTITIONS; do
      LABEL=$(tune2fs -l $device$partition | awk 'BEGIN {FS=":"} /Filesystem volume name/ {gsub(/ /,"",$2); print $2}')
      if [ "$LABEL" = "$DISKLABEL_SYSTEM" ]; then
        DEVICE_MODEL=$(parted -s $device -m print | grep ^$device | cut -f7 -d ":" | sed "s/;//")
        DEVICE_SIZE=$(parted -s $device -m print | grep ^$device | cut -f2 -d ":")
        DEVICE_NAME=$(echo $DEVICE_MODEL ${DEVICE_SIZE} | sed 's/ /_/g')
        PARTITION_LIST="$PARTITION_LIST $device$partition $DEVICE_NAME"
      fi
    done
  done

  if [ "$PARTITION_LIST" = "" ]; then
    msg_no_device
  fi

  dialog --colors --backtitle "$BACKTITLE" --cancel-label "$MSG_CANCEL" \
    $DIALOG_OPTIONS --title "$MSG_TITLE" --menu "$MSG_MENU" 20 50 5 \
    $PARTITION_LIST 2> $TMPDIR/device_for_install

  # now we must do everything
  case $? in
    0)
      INSTALL_PARTITION=$(cat "$TMPDIR/device_for_install")
      INSTALL_PARTITION_FULL=$(echo $PARTITION_LIST | sed "s|.*$INSTALL_PARTITION \([^ ]*\).*|$INSTALL_PARTITION \1|")

      # check for confirmation (twice!)
      MSG_TITLE="\Z1[ Confirmation before copying ]\Zn"
      MSG_DETAIL="\nIf you continue the target partition will be\noverwritten with new KERNEL and SYSTEM files:\n\n$INSTALL_PARTITION_FULL\n\n"
      DIALOG_OPTIONS="--defaultno"
      dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" \
        $DIALOG_OPTIONS --yesno "$MSG_DETAIL" 0 0
      if [ $? -ne 0 ]; then
        menu_main
      fi

      MSG_TITLE="\Z1[ Confirmation before copying ]\Zn"
      MSG_DETAIL="\nThis is last chance to abort the copying!\n\nIf you continue the target partition will be\noverwritten with new KERNEL and SYSTEM files:\n\n$INSTALL_PARTITION_FULL\n\n\n"
      DIALOG_OPTIONS="--defaultno"
      dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" \
        $DIALOG_OPTIONS --yesno "$MSG_DETAIL" 0 0
      if [ $? -ne 0 ]; then
        menu_main
      fi

      # mount system partition
      msg_progress_install "5" "creating $TMPDIR/part1"
      mkdir -p $TMPDIR/part1 >> $LOGFILE 2>&1

      msg_progress_install "10" "mounting $INSTALL_PARTITION to $TMPDIR/part1"
      mount -t ext4 $INSTALL_PARTITION $TMPDIR/part1 >> $LOGFILE 2>&1

      # check for enough target space
      msg_progress_install "15" "checking for space on $INSTALL_PARTITION"

      KERNEL_SIZE=$(stat -t /flash/KERNEL | awk '{print $2}')
      SYSTEM_SIZE=$(stat -t /flash/SYSTEM | awk '{print $2}')
      SRC_SIZE=$(( $KERNEL_SIZE + $SYSTEM_SIZE ))

      DEST_SIZE=$(df $TMPDIR/part1 | awk '/[0-9]%/{print $4}')
      DEST_SIZE=$(( $DEST_SIZE * 1024 ))
      if [ -f $TMPDIR/part1/KERNEL ]; then
        KERNEL_SIZE=$(stat -t $TMPDIR/part1/KERNEL | awk '{print $2}')
        DEST_SIZE=$(( $DEST_SIZE + $KERNEL_SIZE ))
      fi
      if [ -f $TMPDIR/part1/SYSTEM ]; then
        SYSTEM_SIZE=$(stat -t $TMPDIR/part1/SYSTEM | awk '{print $2}')
        DEST_SIZE=$(( $DEST_SIZE + $SYSTEM_SIZE ))
      fi

      if [ $SRC_SIZE -ge $DEST_SIZE ]; then
        umount $TMPDIR/part1 >> $LOGFILE 2>&1
        rmdir $TMPDIR/part1 >> $LOGFILE 2>&1
        msg_target_space
        menu_main
      fi

      # install system files
      msg_progress_install "20" "installing Kernel"
      cp /flash/KERNEL $TMPDIR/part1 >> $LOGFILE 2>&1

      msg_progress_install "40" "installing System"
      cp /flash/SYSTEM $TMPDIR/part1 >> $LOGFILE 2>&1
      sync

      # umount system partition, remove mountpoint
      msg_progress_install "95" "unmount $TMPDIR/part1"
      umount $TMPDIR/part1 >> $LOGFILE 2>&1

      msg_progress_install "100" "remove $TMPDIR/part1"
      rmdir $TMPDIR/part1 >> $LOGFILE 2>&1

      # install complete
      MSG_TITLE="\Z1[ OpenELEC Install Complete ]\Zn"
      MSG_DETAIL="\nYou may now remove the install media and reboot\n"
      dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" --msgbox "$MSG_DETAIL" 6 52

      menu_main
      ;;
    1)
      menu_main
      ;;
    255)
      do_poweroff
      ;;
  esac
}

msg_no_device() {
  # show a warning dialog if we dont find not mounted devices for install and return to main menu
  MSG_TITLE="\Z1[ WARNING ]\Zn"
  MSG_INFOBOX=" No devices were found. "

  dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" --msgbox "$MSG_INFOBOX" 9 70

  menu_main
}

msg_target_space() {
  # show an error dialog for missing space
  MSG_TITLE="\Z1[ TARGET SPACE ]\Zn"
  MSG_INFOBOX="\nNot enough target space!\nCopying aborted.\n"

  dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" --msgbox "$MSG_INFOBOX" 8 70

  menu_main
}

msg_install_ready() {
  # show a dialog that we have installed
  MSG_TITLE="\Z1[ INFORMATION ]\Zn"

  dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" --msgbox " $1" 7 70

  menu_main
}

msg_progress_install() {
  # show the progress dialog
  MSG_TITLE="\Z1[ INSTALLING ]\Zn"

  dbglg "$2"
  dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" --gauge "$2 ..." 6 70 $1 &
}

prompt_gpt() {
  GPT="0"
  UEFI="0"
  # Get size in GB.
  INSTALL_DEVICE_SIZE=$(($(cat /sys/block/${INSTALL_DEVICE#/dev/}/size)*512/1000/1000/1000))
  if [ "$INSTALL_DEVICE_SIZE" -ge 2200 ] 2>/dev/null; then
    GPT="1"
  fi
  # force gpt + uefi in uefi boot mode
  if [ -d /sys/firmware/efi ]; then
    UEFI="1"
    GPT="1"
  fi
}

prompt_backup_unpack() {
  # Prompt for unpacking backup files to /storage
  # usage:    prompt_backup_unpack
  # uses:
  # provides: BACKUP_UNPACK
  BACKUP_UNPACK="0"
  if [ -f /flash/backup.tar.bz2 -o -f /flash/backup.zip ]; then
    MSG_TITLE="\Z1[ Restore backup files ]\Zn"
    MSG_DETAIL="Restore backup files to storage partition.\nFile backup.tar.bz2 or/and backup.zip exist on\ninstallation USB stick."
    DIALOG_OPTIONS="--defaultno"
    if dialog --colors --backtitle "$BACKTITLE" --title "$MSG_TITLE" $DIALOG_OPTIONS --yesno "$MSG_DETAIL" 0 0; then
      BACKUP_UNPACK="1"
    fi
  fi
}

menu_main() {
  # show the mainmenu
  MSG_TITLE="\Z4[ MAIN MENU ]\Zn"
  MSG_MENU="\n\ZbQuick Install:\Zn do a default installation on a specific device \
            \Z1\Zb(this will delete ALL data on this device!)\Zn \
            \n\ZbRepair / Upgrade:\Zn do repair / upgrade \
            \n\ZbShow logfile:\Zn show and save the logfile \
            \n \
            \nPlease select:"
  MSG_CANCEL="Reboot"

  dialog --colors --backtitle "$BACKTITLE" --cancel-label "$MSG_CANCEL" \
    --title "$MSG_TITLE" --menu "$MSG_MENU" 20 70 5 \
      1 "Quick Install of OpenELEC" \
      2 "Repair / Upgrade" \
      3 "Show logfile" 2> $TMPDIR/mainmenu

  case $? in
    0)
      ITEM_MAINMENU=$(cat "$TMPDIR/mainmenu")
      case $ITEM_MAINMENU in
        1) do_install_quick; break;;
        2) do_install_custom; break;;
        3) logfile_show; break;;
      esac
      ;;
    1)
      do_reboot
      ;;
    255)
      do_poweroff
      ;;
  esac
}

logfile_show() {
  dialog --textbox "$LOGFILE" 20 70
  clear
  menu_main
}

do_reboot() {
  # reboot on request
  clear
  sync
  reboot -f
}

do_poweroff() {
  # powerdown on request
  clear
  sync
  poweroff -f
}

# setup needed variables
INSTALLER_VERSION="0.2.7"
OS_VERSION=$(lsb_release)
BACKTITLE="OpenELEC Installer $INSTALLER_VERSION - $OS_VERSION"

TMPDIR="/tmp/installer"
LOGFILE="$TMPDIR/install.log"

# prepare temporary directory
rm -rf $TMPDIR
mkdir -p $TMPDIR

#create log file
touch "$LOGFILE"

# main

while true; do
  clear
  menu_main
done

# exit cleanly
exit 0