#!/system/bin/sh

exec_print() {
  echo "$@"
  $@
}

if [ $# -ne 1 ]; then
  echo "usage: $0 /path/to/magiskinit"
  exit 1
fi

MAGISK_DIR="/sbin"
MAGISK_INIT="$1"
MAGISK_TMPDIR=`dirname "$1"`
MAGISK_BIN="$MAGISK_TMPDIR/magisk"

echo "Extracting magisk from $MAGISK_INIT..."

if [ ! -x "$MAGISK_INIT" ]; then
  echo "$MAGISK_INIT is not executable!"
  exit 1
fi

if [ ! -d "$MAGISK_TMPDIR" ]; then
  echo "$MAGISK_TMPDIR is not a directory!"
  exit 1
fi

exec_print "$MAGISK_INIT" -x magisk "$MAGISK_BIN"

if [ $? -ne 0 ] || [ ! -f "$MAGISK_BIN" ]; then
  echo "Error when extracting magisk binary from magiskinit"
  exit 1
fi

chmod +x "$MAGISK_BIN"

mount | grep -q "$MAGISK_DIR type tmpfs"

if [ $? -eq 1 ]; then
  echo "Overlaying magisk $MAGISK_DIR"
  mount -t tmpfs tmpfs "$MAGISK_DIR"

  if [ $? -ne 0 ]; then
    echo "Failed to create magisk mount point"
    exit 1
  fi
fi

exec_print mv "$MAGISK_INIT" "$MAGISK_DIR"
exec_print mv "$MAGISK_BIN" "$MAGISK_DIR"

if [ -d "/apex" ]; then
  echo "Creating magisk wrapper for /apex LD_LIBRARY_PATH"
  exec_print mv "$MAGISK_DIR/magisk" "$MAGISK_DIR/magisk.bin"
  echo '#!/system/bin/sh' > "$MAGISK_DIR/magisk"
  echo 'export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:/apex/com.android.runtime/lib64"' >> "$MAGISK_DIR/magisk"
  echo 'exec /sbin/magisk.bin "$0" "$@"' >> "$MAGISK_DIR/magisk"
  echo "Wrote wrapper to $MAGISK_DIR/magisk"
  chmod +x "$MAGISK_DIR/magisk"
fi

"$MAGISK_DIR/magisk" -c

if [ $? -ne 0 ]; then
  echo "Unable to execute magisk"
  exit 1
fi

cd "$MAGISK_DIR"

echo "Setting up magisk symbolic links"
ln -s /sbin/magisk su
ln -s /sbin/magisk resetprop
ln -s /sbin/magisk magiskhide
ln -s /sbin/magiskinit64 supolicy
ln -s /sbin/magiskinit64 magiskpolicy
mkdir .magisk
ln -s /sbin/.magisk .core
echo > .magisk/config

chmod 755 . .magisk/ magisk magisk.bin

exec_print /sbin/magisk --post-fs-data
sleep 1
exec_print /sbin/magisk --boot-complete
sleep 1
exec_print /sbin/magisk --service
sleep 1

exit 0