multidisabler-a73/multidisabler

#!/system/bin/sh
#
# A simple Samsung services disabler by Ian Macdonald.
# Enhanced by afaneh92 for Galaxy S22 - https://github.com/mohammad92/android_device_samsung_g0s
# Then enhanced by vitalif for Galaxy A73 - https://yourcmc.ru/git/vitalif/multidisabler-a73 :-)
# With F2FS and "SUPER" partition support.
#
# Use this _JUST_ after installing TWRP to prime your device!
#
# What does it do:
# - Makes /vendor and /system read-write
# - Disables file-based encryption on /data
# - Disables full-disk encryption on /data
# - Disables stock recovery restoration
#

set -e

md5() {
  md5sum -b "$1"
}

file_changed() {
  local file="$1"
  local old_md5="$2"
  local new_md5=$( md5 "$file" )

  if [ $new_md5 != $old_md5 ]; then
    echo " -     ...modified."
  else
    echo " -     ...unchanged."
  fi
}

resize_fs() {
  local path=$1
  local label=$2
  local partname=$3
  local percent=$4
  local dm_block_ext4=$(df -t ext4 | grep "$path"'$' | cut -DF1)
  local dm_block_f2fs=$(df -t f2fs | grep "$path"'$' | cut -DF1)

  if [ "$dm_block_ext4" ]; then
    echo " - Unmounting $path..."
    umount $path
    echo " - Checking $path block partition before resizing..."
    e2fsck -f $dm_block_ext4
    echo " - Resizing the filesystem on $dm_block_ext4..."
    resize2fs $dm_block_ext4
    echo " - Make the $path partition R/W by unsharing its blocks..."
    e2fsck -E unshare_blocks $dm_block_ext4
  elif [ "$dm_block_f2fs" ]; then
    fs_size_mb=`du -sm $path | cut -f1`
    part_size_mb=`blockdev --getsize64 $dm_block_f2fs | awk '{print int($1 / 1048576)}'`
    super_free_mb=`lptools free | grep Free | awk '{print int($3 / 1048576)}'`
    new_fs_size_mb=`echo $fs_size_mb $super_free_mb $percent | awk '{print int($1 + $2 * $3 / 100)}'`
    if [[ "$new_fs_size_mb" -le "$part_size_mb" ]]; then
      # just in case if we resized the partition, but not the FS
      new_fs_size_mb=$part_size_mb
    fi
    uuid=`toybox blkid $dm_block_f2fs | egrep '[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}' -o`
    echo " - Create R/W $partname image..."
    truncate -s ${new_fs_size_mb}M /data/new-rw.img
    make_f2fs -g android -O project_quota,extra_attr,inode_checksum,sb_checksum,compression,flexible_inline_xattr,verity,inode_crtime -U $uuid -f -l $label /data/new-rw.img
    mkdir -p /data/new-rw
    mount /data/new-rw.img /data/new-rw
    echo " - Copy old R/O $partname files to our new created image..."
    cp -a --preserve=all $path/* /data/new-rw
    # Android's toybox `cp` is buggy: `cp -a --preserve=all` does NOT preserve selinux contexts
    # on directories and symlinks and you get a bootloop. So we need to restore selinux contexts...
    cd $path
    find . -type dl -exec ls -dZ {} \; | awk '{ print "chcon -h " $0 }' > /data/new-rw-chcon.sh
    cd /data/new-rw
    sh /data/new-rw-chcon.sh
    cd /
    umount $path
    umount /data/new-rw
    echo " - Checking $partname image before flashing..."
    fsck.f2fs -f /data/new-rw.img
    echo " - Resizing partition $partname inside 'super' to $new_fs_size_mb MB using lptools"
    lptools resize $partname $(stat -c '%s' /data/new-rw.img)
    lptools unmap $partname
    lptools map $partname
    echo " - Writing our new R/W $partname image, please wait..."
    dd if=/data/new-rw.img of=/dev/block/bootdevice/by-name/$partname bs=1M
    rm -rf /data/new-rw*
  fi
  echo " - Remounting $path..."
  mount $path
  mount -o remount,rw $path
}

fs_free_size_check() {
  local path=$1
  local label=$2
  local partname=$3
  local percent=$4
  echo " - Checking $path free space..."
  if dd if=/dev/zero of=$path/test bs=1 count=1 2>/dev/null; then
    echo " -     ...succeeded."
    rm -f $path/test
  else
    echo " -     ...No free space on $path, attempting to resize it..."
    echo " "
    rm -f $path/test
    resize_fs "$path" "$label" "$partname" "$percent"
  fi
}

disable_fbe() {
  local md5
  local i
  fstab_files=`grep -lr 'fileencryption' vendor/etc || true`

  #
  # Exynos devices = fstab.exynos*.
  # MediaTek devices = fstab.mt*.
  # Snapdragon devices = fstab.qcom, fstab.emmc, fstab.default
  #
  for i in $fstab_files; do
    if [ -f $i ]; then
      echo " - Disabling file-based encryption (FBE) for /data..."
      echo " -   Found $i."
      md5=$( md5 $i )
      # This comments out the offending line and adds an edited one.
      sed -i -e 's/^\([^#].*\)fileencryption=[^,]*\(.*\)$/# &\n\1encryptable\2/g' $i
      file_changed $i $md5
    fi
  done
}

disable_fde() {
  local md5
  local i
  fstab_files=`grep -lr 'forceencrypt' vendor/etc || true`

  #
  # Exynos devices = fstab.exynos*.
  # MediaTek devices = fstab.mt*.
  # Snapdragon devices = fstab.qcom, fstab.emmc, fstab.default
  #
  for i in $fstab_files; do
    if [ -f $i ]; then
      echo " - Disabling full-disk encryption (FDE) for /data..."
      echo " -   Found $i."
      md5=$( md5 $i )
      # This comments out the offending line and adds an edited one.
      sed -i -e 's/^\([^#].*\)forceencrypt=[^,]*\(.*\)$/# &\n\1encryptable\2/g' $i
      file_changed $i $md5
    fi
  done
}

disable_recovery_restoration() {
  local r=recovery-from-boot.p
  local found
  local i

  echo " - Disabling restoration of stock recovery..."

  for i in $ANDROID_ROOT $ANDROID_ROOT/system /vendor; do
    if [ -f $i/$r~ ]; then
      echo " -   ...already disabled."
      found=true
      break
    fi

    if [ -f $i/$r ]; then
      echo " -   Found $i/$r. Disabling..."
      mv $i/$r $i/$r~

      if [ -f $i/$r~ ]; then
        echo " -     ...succeeded."
      else
        echo " -     ...failed."
      fi

      found=true
      break
    fi

  done

  [ -z "$found" ] && echo " -   Found no stock recovery. Pfft." || true
}

echo " "
echo "Multi-disabler for Samsung devices"
echo "running Android 9 or later."
echo "by Ian Macdonald, enhanced by afaneh92"
echo "patched for Galaxy A73 by vitalif"
echo " "

os=$(getprop ro.build.version.release)
major=${os%%.*}
bl=$(getprop ro.boot.bootloader)
dp=$(getprop ro.boot.dynamic_partitions)

# Firmware version starts at either 8th or 9th character, depending on length
# of bootloader string (12 or 13).
#
fw=${bl:$((${#bl} - 4)):4}

# Device is first 5 characters of bootloader string.
#
device=${bl:0:$((${#bl} - 8))}
mft=$(getprop ro.product.manufacturer | tr '[A-Z]' '[a-z]')

if [ "$mft" != samsung ]; then
  echo " - Device appears not to be made by Samsung."
  fatal=true
elif [ -z "$device" ]; then
  echo " - Could not determine device model."
  fatal=true
elif [ $major -lt 9 ]; then
  echo " - This software is incompatible with Android $major."
  fatal=true
fi
if [ -n "$fatal" ]; then
  echo " - Installation aborted."
  echo " "
  exit 1
fi

echo " - Detected a $device device with a $fw bootloader."
echo " - The environment appears to be Android $major."
echo " "

echo " - Mounting /data..."
mount /data || true
if ! mount | grep '/data ' >/dev/null; then
  echo " -   Mount failed. Aborting..."
  exit 3
fi

echo " - Mounting $ANDROID_ROOT..."
if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
  mount -o rw $ANDROID_ROOT 2>/dev/null || true
  if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
    ANDROID_ROOT=/system_root
    echo " -   Attempt failed. Mounting at $ANDROID_ROOT..."
    if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
      mount -o rw $ANDROID_ROOT
      if ! mount | grep "$ANDROID_ROOT " >/dev/null; then
        echo " -   Even that attempt failed. Aborting..."
        exit 2
      fi
    fi
  fi
fi

echo " - Mounting /vendor..."
mount /vendor || true
mount -o remount,rw /vendor || true
if ! mount | grep '/vendor ' >/dev/null; then
  echo " -   Mount failed. Aborting..."
  exit 3
fi

fs_free_size_check $ANDROID_ROOT "/" system 70
fs_free_size_check /vendor vendor vendor 50
disable_fbe
disable_fde
disable_recovery_restoration

echo " - Unmounting /vendor..."
umount /vendor
echo " - Unmounting $ANDROID_ROOT..."
umount $ANDROID_ROOT

echo " "
echo " - Finished."
echo " "

exit 0