Adds support for VFAT on Android 11 and above (#33)

* restyle the mount script

* Adds support of VFAT or MSDOS on Android 11+

* Adds fixes in the unmount routine

* fix styling

* reverting changes

scripts/mount_ext4.sh

@@ -12,7 +12,10 @@ if [ "$(readlink /proc/self/ns/mnt)" != "$(readlink /proc/1/ns/mnt)" ]; then
 fi
 
 mkdir -p -v /mnt/my_drive
-mount -t ext4 -o nosuid,nodev,noexec,noatime "$1" /mnt/my_drive
+mount \
+    -t ext4 \
+    -o nosuid,nodev,noexec,noatime \
+    "$1" /mnt/my_drive
 
 mkdir -p -v /mnt/my_drive/the_binding
 chmod -R 777 /mnt/my_drive
@@ -23,6 +26,9 @@ chown -R sdcard_rw:sdcard_rw /mnt/my_drive
 setenforce 0
 
 mkdir -p -v /mnt/runtime/write/emulated/0/the_binding
-mount -t sdcardfs -o nosuid,nodev,noexec,noatime,gid=9997 /mnt/my_drive/the_binding /mnt/runtime/write/emulated/0/the_binding
+mount \
+    -t sdcardfs \
+    -o nosuid,nodev,noexec,noatime,gid=9997 \
+    /mnt/my_drive/the_binding /mnt/runtime/write/emulated/0/the_binding
 
 # TODO: reduce permissions via chmod & sdcardfs mask

scripts/remount_vfat.sh

@@ -28,18 +28,38 @@ if [ ! -d "$mounted_drive_path" ]; then
 fi
 
 fs_type=$(stat -f -c %T "$mounted_drive_path")
-if [ "$fs_type" != "msdos" ]; then
-    echo "detected filesystem type was not 'msdos', found $fs_type"
+if [ "$fs_type" != "msdos" && "$fs_type" != "vfat"]; then
+    echo "detected filesystem type was not 'msdos' or 'vfat', found $fs_type"
     exit 1
 fi
 
+android_version=$(getprop ro.build.version.release)
+
 drive_binding_dir="$mounted_drive_path/the_binding"
-internal_binding_dir="/mnt/runtime/write/emulated/0/the_binding"
+if [ $android_version -gt 10 ]; then
+  # for Android 11+
+  internal_binding_dir="/mnt/pass_through/0/emulated/0/the_binding"
+else
+  # for Android 10 and below
+  internal_binding_dir="/mnt/runtime/write/emulated/0/the_binding"
+fi
+# create mount points and binding directory
 mkdir -p -v "$drive_binding_dir"
 mkdir -p -v "$internal_binding_dir"
+
+if [ $android_version -gt 10 ]; then
 mount \
--t sdcardfs \
--o nosuid,nodev,noexec,noatime,gid=9997 \
-"$drive_binding_dir" "$internal_binding_dir"
+  "$drive_binding_dir" "$internal_binding_dir"
+else
+mount \
+  -t sdcardfs \
+  -o nosuid,nodev,noexec,noatime,gid=9997 \
+  "$drive_binding_dir" "$internal_binding_dir"
+fi
+
+# broadcast the mounted directory to media scanner
+am broadcast \
+  -a android.intent.action.MEDIA_SCANNER_SCAN_FILE \
+  -d file:///storage/emulated/0/the_binding/
 
-echo "vfat drive remounted succesfully"
+echo "vfat drive remounted succesfully"

scripts/unmount.sh

@@ -11,5 +11,6 @@ if [ "$(readlink /proc/self/ns/mnt)" != "$(readlink /proc/1/ns/mnt)" ]; then
   exit 1
 fi
 
+umount -v /mnt/pass_through/0/emulated/0/the_binding
 umount -v /mnt/runtime/write/emulated/0/the_binding
 umount -v /mnt/my_drive