add new mounting script

Makefile

@@ -14,6 +14,7 @@ DEVICE_TEMP_DIRECTORY := /data/local/tmp
 
 ALL_SCRIPTS := \
 scripts/mount_ext4.sh \
+scripts/mount_folder.sh \
 scripts/unmount.sh \
 scripts/find_device.sh \
 scripts/show_devices.sh \

scripts/mount_folder.sh

@@ -0,0 +1,14 @@
+#!/bin/sh -ex
+
+################################################################################
+# Description: bind mounts the specified directory to /the_binding in internal storage
+# Author: Vivek Revankar <vivek@master-hax.com>
+# Usage: ./mount_folder.sh <DIRECTORY_PATH>
+################################################################################
+
+if [ "$(readlink /proc/self/ns/mnt)" != "$(readlink /proc/1/ns/mnt)" ]; then
+  echo "not running in global mount namespace, try elevating first"
+  exit 1
+fi
+
+mount -t sdcardfs -o nosuid,nodev,noexec,noatime,gid=9997 "$1" /mnt/runtime/write/emulated/0/the_binding