#!/sbin/sh
# AnyKernel3 Backend (DO NOT CHANGE)
# osm0sis @ xda-developers

OUTFD=/proc/self/fd/$2;
ZIPFILE="$3";

ps | grep zygote | grep -v grep >/dev/null && BOOTMODE=true || BOOTMODE=false;
$BOOTMODE || ps -A 2>/dev/null | grep zygote | grep -v grep >/dev/null && BOOTMODE=true;

$BOOTMODE && DIR=/sdcard || DIR=$(dirname "$ZIPFILE");

test "$ANDROID_ROOT" || ANDROID_ROOT=/system;
test "$home" || home=/tmp/anykernel;

ui_print() {
  until [ ! "$1" ]; do
    echo -e "ui_print $1\nui_print" > $OUTFD;
    shift;
  done;
}
ui_printfile() {
  while IFS='' read -r line || $bb [[ -n "$line" ]]; do
    ui_print "$line";
  done < $1;
}
show_progress() { echo "progress $1 $2" > $OUTFD; }
file_getprop() { $bb grep "^$2=" "$1" | $bb cut -d= -f2-; }
int2ver() {
  if [ "$1" -eq "$1" ] 2>/dev/null; then
    echo "$1.0.0";
  elif [ ! "$(echo "$1" | $bb cut -d. -f3)" ]; then
    echo "$1.0";
  else
    echo "$1";
  fi;
}
cleanup() {
  cd $(dirname $home);
  rm -rf $home;
}
debugging() {
  case $(basename "$ZIPFILE" .zip) in
    *-debugging)
      ui_print " " "Creating debugging archive in $DIR...";
      test -f /tmp/recovery.log && log=/tmp/recovery.log;
      $bb tar -czf "$DIR/anykernel3-$(date +%Y-%m-%d_%H%M%S)-debug.tgz" $home $log;
    ;;
  esac;
}
setup_mountpoint() {
  test -L $1 && $bb mv -f $1 ${1}_link;
  if [ ! -d $1 ]; then
    rm -f $1;
    mkdir $1;
  fi;
}
is_mounted() { $bb mount | $bb grep -q " $1 "; }
umount_all() {
  (umount_apex;
  $bb umount /system;
  $bb umount -l /system;
  if [ -e /system_root ]; then
    $bb umount /system_root;
    $bb umount -l /system_root;
  fi;
  umount /vendor;
  umount -l /vendor;
  if [ "$umount_data" ]; then
    $bb umount /data;
    $bb umount -l /data;
  fi) 2>/dev/null;
}
mount_apex() {
  [ -d /system/apex ] || return 1
  [ -L /apex ] && rm -f /apex
  if [ -f "/system/apex/com.android.runtime.release.apex" ]; then
    local j=0
    [ -e /dev/block/loop1 ] && local minorx=$(ls -l /dev/block/loop1 | $bb awk '{print $6}') || local minorx=1
    for i in /system/apex/*.apex; do
      local dest="/apex/$(basename $i | sed 's/.apex$//')"
      [ "$dest" == "/apex/com.android.runtime.release" ] && dest="/apex/com.android.runtime"
      mkdir -p $dest
      $bb unzip -qo $i apex_payload.img -d /apex
      mv -f /apex/apex_payload.img $dest.img
      while [ $j -lt 50 ]; do
        loop=/dev/loop$j
        $bb mknod $loop b 7 $((j * minorx)) 2>/dev/null
        $bb losetup $loop $dest.img 2>/dev/null
        j=$((j + 1))
        $bb losetup $loop | grep -q $dest.img && break
      done;
      uloop="$uloop $((j - 1))"
      $bb mount -t ext4 -o loop,noatime,ro $loop $dest || return 1
    done
  # Already extracted payload imgs present, just mount the folders
  elif [ -d "/system/apex/com.android.runtime.release" ]; then
    for i in /system/apex/*; do
      local dest="/apex/$(basename $i)"
      [ "$dest" == "/apex/com.android.runtime.release" ] && dest="/apex/com.android.runtime"
      mkdir -p $dest
      $bb mount -o bind,ro $i $dest
    done
  fi
}
umount_apex() {
  [ -d /apex ] || return 1
  for i in /apex/*; do
    $bb umount -l $i 2>/dev/null
  done
  if [ -f "/system/apex/com.android.runtime.release.apex" ]; then
    for i in $uloop; do
      local loop=/dev/loop$i
      losetup -d $loop 2>/dev/null || break
    done
  fi
  rm -rf /apex
}
restore_env() {
  test "$savedpath" && export LD_LIBRARY_PATH="$savedpath";
  test "$savedpre" && export LD_PRELOAD="$savedpre";
  umount_all;
  ($bb mv -f /system_link /system;
  $bb mv -f /system_root_link /system_root;
  $bb umount -l /dev/random) 2>/dev/null;
}
abort() {
  ui_print "$@";
  debugging;
  restore_env;
  if [ ! -f anykernel.sh -o "$(file_getprop anykernel.sh do.cleanuponabort 2>/dev/null)" == 1 ]; then
    cleanup;
  fi;
  exit 1;
}

show_progress 1.34 4;
ui_print " ";
cleanup;
mkdir -p $home/bin;
cd $home;
unzip -o "$ZIPFILE";
if [ $? != 0 -o ! "$(ls tools)" ]; then
  abort "Unzip failed. Aborting...";
fi;
for arch32 in x86 arm; do
  if [ -d $home/tools/$arch32 ]; then
    bb=$home/tools/$arch32/busybox;
    chmod 755 $bb;
    $bb >/dev/null 2>&1;
    if [ $? == 0 ]; then
      $bb mv -f $home/tools/$arch32/* $home/tools;
      break;
    fi;
  fi;
done;
bb=$home/tools/busybox;
chmod 755 $bb;
$bb chmod -R 755 tools bin;
$bb --install -s bin;
if [ $? != 0 -o -z "$(ls bin)" ]; then
  abort "Busybox setup failed. Aborting...";
fi;

if [ -f banner ]; then
  ui_printfile banner;
  ui_print " " " ";
fi;

ui_print "$(file_getprop anykernel.sh kernel.string)";
if [ -f version ]; then
  ui_print " ";
  ui_printfile version;
  ui_print " ";
fi;
ui_print " " "AnyKernel3 by osm0sis @ xda-developers" " " " ";

$BOOTMODE || $bb mount -o bind /dev/urandom /dev/random;
umount_all;
setup_mountpoint $ANDROID_ROOT;
if ! is_mounted $ANDROID_ROOT; then
  $bb mount -o ro -t auto $ANDROID_ROOT;
fi;
case $ANDROID_ROOT in
  /system_root) setup_mountpoint /system;;
  /system)
    if [ -f /system/system/build.prop ]; then
      setup_mountpoint /system_root;
      $bb mount --move /system /system_root;
      if [ $? != 0 ]; then
        $bb umount /system;
        $bb umount -l /system 2>/dev/null;
        $bb mount -o ro -t auto /dev/block/bootdevice/by-name/system /system_root;
      fi;
    fi;
  ;;
esac;
if is_mounted /system_root; then
  $bb mount -o bind /system_root/system /system;
fi;
$bb mount -o ro -t auto /vendor 2>/dev/null;
mount_apex;
if ! is_mounted /data; then
  $bb mount /data;
  umount_data=1;
fi;

savedpath="$LD_LIBRARY_PATH";
savedpre="$LD_PRELOAD";
unset LD_LIBRARY_PATH;
unset LD_PRELOAD;

if [ ! "$(getprop 2>/dev/null)" ]; then
  getprop() {
    local propdir propfile propval;
    for propdir in / /system_root /system /vendor /odm /product; do
      for propfile in default.prop build.prop; do
        test "$propval" && break 2 || propval="$(file_getprop $propdir/$propfile $1 2>/dev/null)";
      done;
    done;
    test "$propval" && echo "$propval" || echo "";
  }
elif [ ! "$(getprop ro.build.type 2>/dev/null)" ]; then
  getprop() {
    ($(which getprop) | $bb grep "$1" | $bb cut -d[ -f3 | $bb cut -d] -f1) 2>/dev/null;
  }
fi;

if [ "$(file_getprop anykernel.sh do.devicecheck)" == 1 ]; then
  ui_print "Checking device...";
  device=$(getprop ro.product.device 2>/dev/null);
  product=$(getprop ro.build.product 2>/dev/null);
  vendordevice=$(getprop ro.product.vendor.device 2>/dev/null);
  vendorproduct=$(getprop ro.vendor.product.device 2>/dev/null);
  for testname in $(file_getprop anykernel.sh 'device.name.*'); do
    for devicename in $device $product $vendordevice $vendorproduct; do
      if [ "$devicename" == "$testname" ]; then
        ui_print "$testname" " ";
        match=1;
        break 2;
      fi;
    done;
  done;
  if [ ! "$match" ]; then
    abort " " "Unsupported device. Aborting...";
  fi;
fi;

supported_ver=$(file_getprop anykernel.sh supported.versions | $bb tr -d '[:space:]');
if [ "$supported_ver" ]; then
  ui_print "Checking Android version...";
  android_ver=$(file_getprop /system/build.prop ro.build.version.release);
  parsed_ver=$(int2ver $android_ver);
  if echo $supported_ver | $bb grep -q '-'; then
    lo_ver=$(int2ver "$(echo $supported_ver | $bb cut -d- -f1)");
    hi_ver=$(int2ver "$(echo $supported_ver | $bb cut -d- -f2)");
    if echo -e "$hi_ver\n$lo_ver\n$parsed_ver" | $bb sort -g | $bb grep -n "$parsed_ver" | $bb grep -q '^2:'; then
      supported=1;
    fi;
  else
    for ver in $(echo $supported_ver | $bb sed 's;,; ;g'); do
      if [ "$(int2ver $ver)" == "$parsed_ver" ]; then
        supported=1;
        break;
      fi;
    done;
  fi;
  if [ "$supported" ]; then
    ui_print "$android_ver" " ";
  else
    abort " " "Unsupported Android version. Aborting...";
  fi;
fi;

supported_lvl=$(file_getprop anykernel.sh supported.patchlevels | $bb grep -oE '[0-9]{4}-[0-9]{2}|-');
if [ "$supported_lvl" ]; then
  ui_print "Checking Android security patch level...";
  android_lvl=$(file_getprop /system/build.prop ro.build.version.security_patch);
  parsed_lvl=$(echo $android_lvl | $bb grep -oE '[0-9]{4}-[0-9]{2}');
  if echo $supported_lvl | $bb grep -q '^\-'; then
    lo_lvl=0000-00;
    hi_lvl=$(echo $supported_lvl | $bb awk '{ print $2 }');
  elif echo $supported_lvl | $bb grep -q ' - '; then
    lo_lvl=$(echo $supported_lvl | $bb awk '{ print $1 }');
    hi_lvl=$(echo $supported_lvl | $bb awk '{ print $3 }');
  elif echo $supported_lvl | $bb grep -q '\-$'; then
    lo_lvl=$(echo $supported_lvl | $bb awk '{ print $1 }');
    hi_lvl=9999-99;
  fi;
  if echo -e "$hi_lvl\n$lo_lvl\n$parsed_lvl" | $bb sort -g | $bb grep -n "$parsed_lvl" | $bb grep -q '^2:'; then
    ui_print "$android_lvl" " ";
  else
    abort " " "Unsupported Android security patch level. Aborting...";
  fi;
fi;

ui_print "Installing...";
core=$($bb grep -oE 'ak.*core.sh' anykernel.sh);
test -f tools/$core || $bb ln -s $home/tools/ak*-core.sh $home/tools/$core;
PATH="$home/bin:$PATH" home=$home $bb ash anykernel.sh $2;
if [ $? != 0 ]; then
  abort;
fi;

if [ "$(file_getprop anykernel.sh do.modules)" == 1 ]; then
  ui_print " " "Pushing modules...";
  $bb mount -o rw,remount -t auto /system;
  $bb mount -o rw,remount -t auto /vendor 2>/dev/null;
  cd $home/modules;
  for module in $(find . -name '*.ko'); do
    modtarget=$(echo $module | $bb cut -c2-);
    if [ ! -e $modtarget ]; then
      case $module in
        */vendor/*) modcon=vendor;;
        *) modcon=system;;
      esac;
    fi;
    if is_mounted $modtarget; then
      $bb mount -o rw,remount -t auto $modtarget;
    fi;
    mkdir -p $(dirname $modtarget);
    $bb cp -rLf $module $modtarget;
    $bb chown 0:0 $modtarget;
    $bb chmod 644 $modtarget;
    if [ "$modcon" ]; then
      chcon "u:object_r:${modcon}_file:s0" $modtarget;
    fi;
    if is_mounted $modtarget; then
      $bb mount -o ro,remount -t auto $modtarget;
    fi;
  done;
  cd $home;
  $bb mount -o ro,remount -t auto /system;
  $bb mount -o ro,remount -t auto /vendor 2>/dev/null;
fi;

debugging;
restore_env;

if [ "$(file_getprop anykernel.sh do.cleanup)" == 1 ]; then
  cleanup;
fi;

ui_print " " " " "Done!";