Magisk/scripts/flash_script.sh

#!/sbin/sh
##########################################################################################
#
# Magisk Flash Script
# by topjohnwu
# 
# This script will detect, construct the environment for Magisk
# It will then call boot_patch.sh to patch the boot image
#
##########################################################################################

# Detect whether in boot mode
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

# This path should work in any cases
TMPDIR=/dev/tmp

INSTALLER=$TMPDIR/magisk
COMMONDIR=$INSTALLER/common
CHROMEDIR=$INSTALLER/chromeos
COREDIR=/magisk/.core

# Default permissions
umask 022

##########################################################################################
# Flashable update-binary preparation
##########################################################################################

OUTFD=$2
ZIP=$3

readlink /proc/$$/fd/$OUTFD 2>/dev/null | grep /tmp >/dev/null
if [ "$?" -eq "0" ]; then
  OUTFD=0

  for FD in `ls /proc/$$/fd`; do
    readlink /proc/$$/fd/$FD 2>/dev/null | grep pipe >/dev/null
    if [ "$?" -eq "0" ]; then
      ps | grep " 3 $FD " | grep -v grep >/dev/null
      if [ "$?" -eq "0" ]; then
        OUTFD=$FD
        break
      fi
    fi
  done
fi

mkdir -p $INSTALLER
cd $INSTALLER
unzip -o "$ZIP"

##########################################################################################
# Functions
##########################################################################################

ui_print() {
  if $BOOTMODE; then
    echo "$1"
  else 
    echo -n -e "ui_print $1\n" >> /proc/self/fd/$OUTFD
    echo -n -e "ui_print\n" >> /proc/self/fd/$OUTFD
  fi
}

getvar() {
  local VARNAME=$1
  local VALUE=$(eval echo \$"$VARNAME");
  for FILE in /dev/.magisk /data/.magisk /cache/.magisk /system/.magisk; do
    if [ -z "$VALUE" ]; then
      LINE=$(cat $FILE 2>/dev/null | grep "$VARNAME=")
      if [ ! -z "$LINE" ]; then
        VALUE=${LINE#*=}
      fi
    fi
  done
  eval $VARNAME=\$VALUE
}

find_boot_image() {
  if [ -z "$BOOTIMAGE" ]; then
    for PARTITION in kern-a android_boot kernel boot lnx; do
      BOOTIMAGE=`find /dev/block -iname "$PARTITION" | head -n 1`
      [ ! -z $BOOTIMAGE ] && break
    done
  fi
  # Recovery fallback
  if [ -z "$BOOTIMAGE" ]; then
    for FSTAB in /etc/*fstab*; do
      BOOTIMAGE=`grep -E '\b/boot\b' $FSTAB | grep -oE '/dev/[a-zA-Z0-9_./-]*'`
      [ ! -z $BOOTIMAGE ] && break
    done
  fi
  [ -L "$BOOTIMAGE" ] && BOOTIMAGE=`readlink $BOOTIMAGE`
}

is_mounted() {
  if [ ! -z "$2" ]; then
    cat /proc/mounts | grep $1 | grep $2, >/dev/null
  else
    cat /proc/mounts | grep $1 >/dev/null
  fi
  return $?
}

mount_image() {
  if [ ! -d "$2" ]; then
    mount -o rw,remount rootfs /
    mkdir -p $2 2>/dev/null
    ($BOOTMODE) && mount -o ro,remount rootfs /
    [ ! -d "$2" ] && return 1
  fi
  if (! is_mounted $2); then
    LOOPDEVICE=
    for LOOP in 0 1 2 3 4 5 6 7; do
      if (! is_mounted $2); then
        LOOPDEVICE=/dev/block/loop$LOOP
        if [ ! -f "$LOOPDEVICE" ]; then
          mknod $LOOPDEVICE b 7 $LOOP 2>/dev/null
        fi
        losetup $LOOPDEVICE $1
        if [ "$?" -eq "0" ]; then
          mount -t ext4 -o loop $LOOPDEVICE $2
          if (! is_mounted $2); then
            /system/bin/toolbox mount -t ext4 -o loop $LOOPDEVICE $2
          fi
          if (! is_mounted $2); then
            /system/bin/toybox mount -t ext4 -o loop $LOOPDEVICE $2
          fi
        fi
        if (is_mounted $2); then
          ui_print "- Mounting $1 to $2"
          break;
        fi
      fi
    done
  fi
}

grep_prop() {
  REGEX="s/^$1=//p"
  shift
  FILES=$@
  if [ -z "$FILES" ]; then
    FILES='/system/build.prop'
  fi
  cat $FILES 2>/dev/null | sed -n "$REGEX" | head -n 1
}

remove_system_su() {
  if [ -f /system/bin/su -o -f /system/xbin/su ] && [ ! -f /su/bin/su ]; then
    ui_print "! System installed root detected, mount rw :("
    mount -o rw,remount /system
    # SuperSU
    if [ -e /system/bin/.ext/.su ]; then
      mv -f /system/bin/app_process32_original /system/bin/app_process32 2>/dev/null
      mv -f /system/bin/app_process64_original /system/bin/app_process64 2>/dev/null
      mv -f /system/bin/install-recovery_original.sh /system/bin/install-recovery.sh 2>/dev/null
      cd /system/bin
      if [ -e app_process64 ]; then
        ln -sf app_process64 app_process
      else
        ln -sf app_process32 app_process
      fi
    fi
    rm -rf /system/.pin /system/bin/.ext /system/etc/.installed_su_daemon /system/etc/.has_su_daemon \
    /system/xbin/daemonsu /system/xbin/su /system/xbin/sugote /system/xbin/sugote-mksh /system/xbin/supolicy \
    /system/bin/app_process_init /system/bin/su /cache/su /system/lib/libsupol.so /system/lib64/libsupol.so \
    /system/su.d /system/etc/install-recovery.sh /system/etc/init.d/99SuperSUDaemon /cache/install-recovery.sh \
    /system/.supersu /cache/.supersu /data/.supersu \
    /system/app/Superuser.apk /system/app/SuperSU /cache/Superuser.apk  2>/dev/null
  fi
}

abort() {
  ui_print "$1"
  mv /sbin_tmp /sbin 2>/dev/null
  exit 1
}

##########################################################################################
# Detection
##########################################################################################

ui_print "************************"
ui_print "* MAGISK_VERSION_STUB"
ui_print "************************"

[ -d "$COMMONDIR" ] || abort "! Unable to extract zip file!"

ui_print "- Mounting /system(ro), /cache, /data"
mount -o ro /system 2>/dev/null
mount /cache 2>/dev/null
mount /data 2>/dev/null

[ -f /system/build.prop ] || abort "! /system could not be mounted!"

# read override variables
getvar KEEPVERITY
getvar KEEPFORCEENCRYPT
getvar BOOTIMAGE

# Check if system root is installed and remove
remove_system_su

API=`grep_prop ro.build.version.sdk`
ABI=`grep_prop ro.product.cpu.abi | cut -c-3`
ABI2=`grep_prop ro.product.cpu.abi2 | cut -c-3`
ABILONG=`grep_prop ro.product.cpu.abi`

ARCH=arm
IS64BIT=false
if [ "$ABI" = "x86" ]; then ARCH=x86; fi;
if [ "$ABI2" = "x86" ]; then ARCH=x86; fi;
if [ "$ABILONG" = "arm64-v8a" ]; then ARCH=arm64; IS64BIT=true; fi;
if [ "$ABILONG" = "x86_64" ]; then ARCH=x64; IS64BIT=true; fi;

[ $API -lt 21 ] && abort "! Magisk is only for Lollipop 5.0+ (SDK 21+)"

ui_print "- Device platform: $ARCH"

BINDIR=$INSTALLER/$ARCH
chmod -R 755 $CHROMEDIR $BINDIR

find_boot_image
[ -z $BOOTIMAGE ] && abort "! Unable to detect boot image"

##########################################################################################
# Environment
##########################################################################################

ui_print "- Constructing environment"

if ! $BOOTMODE; then
  # Completely use /system components
  [ -e /vendor ] || ln -s /system/vendor /vendor
  export PATH=/system/bin:/system/xbin:/vendor/bin
  # Clear out possible lib paths, let the binary find them itself
  export LD_LIBRARY_PATH=
  # Completely block out all custom recovery binaries/libs
  mv /sbin /sbin_tmp
fi

is_mounted /data && MAGISKBIN=/data/magisk || MAGISKBIN=/cache/data_bin

# Copy required files
rm -rf $MAGISKBIN 2>/dev/null
mkdir -p $MAGISKBIN
cp -af $BINDIR/. $COMMONDIR/. $MAGISKBIN

chmod -R 755 $MAGISKBIN
chcon -hR u:object_r:system_file:s0 $MAGISKBIN

##########################################################################################
# Magisk Image
##########################################################################################

# Fix SuperSU.....
$BOOTMODE && $BINDIR/magiskpolicy --live "allow fsck * * *"

if (is_mounted /data); then
  IMG=/data/magisk.img
else
  IMG=/cache/magisk.img
  ui_print "- Data unavailable, use cache workaround"
fi

if [ -f $IMG ]; then
  ui_print "- $IMG detected!"
else
  ui_print "- Creating $IMG"
  $BINDIR/magisk --createimg $IMG 64M
fi

mount_image $IMG /magisk
is_mounted /magisk || abort "! Magisk image mount failed..."
MAGISKLOOP=$LOOPDEVICE

# Core folders
mkdir -p $COREDIR/props $COREDIR/post-fs-data.d $COREDIR/service.d 2>/dev/null

chmod 755 $COREDIR/post-fs-data.d $COREDIR/service.d
chown 0.0 $COREDIR/post-fs-data.d $COREDIR/service.d

# Legacy cleanup
mv $COREDIR/magiskhide/hidelist $COREDIR/hidelist 2>/dev/null
rm -rf $COREDIR/magiskhide $COREDIR/bin

##########################################################################################
# Unpack boot
##########################################################################################

ui_print "- Found Boot Image: $BOOTIMAGE"

# Update our previous backup to new format if exists
if [ -f /data/stock_boot.img ]; then
  SHA1=`$BINDIR/magiskboot --sha1 /data/stock_boot.img | tail -n 1`
  STOCKDUMP=/data/stock_boot_${SHA1}.img
  mv /data/stock_boot.img $STOCKDUMP
  $BINDIR/magiskboot --compress $STOCKDUMP
fi

SOURCEDMODE=true
cd $MAGISKBIN

# Source the boot patcher
. $COMMONDIR/boot_patch.sh "$BOOTIMAGE"

# Sign chromeos boot
if [ -f chromeos ]; then
  echo > empty

  $CHROMEDIR/futility vbutil_kernel --pack new-boot.img.signed \
  --keyblock $CHROMEDIR/kernel.keyblock --signprivate $CHROMEDIR/kernel_data_key.vbprivk \
  --version 1 --vmlinuz new-boot.img --config empty --arch arm --bootloader empty --flags 0x1

  rm -f empty new-boot.img
  mv new-boot.img.signed new-boot.img
fi

if is_mounted /data; then
  rm -f /data/stock_boot* 2>/dev/null
  mv stock_boot* /data 2>/dev/null
fi

ui_print "- Flashing new boot image"
if [ -L "$BOOTIMAGE" ]; then
  dd if=new-boot.img of="$BOOTIMAGE" bs=4096
else
  cat new-boot.img /dev/zero | dd of="$BOOTIMAGE" bs=4096
fi
rm -f new-boot.img

cd /

if ! $BOOTMODE; then
  mv /sbin_tmp /sbin
  ui_print "- Unmounting partitions"
  umount /magisk
  losetup -d $MAGISKLOOP 2>/dev/null
  rmdir /magisk
  umount -l /system
fi

ui_print "- Done"
exit 0