insert or eject file from gadget mass storage

diff --git a/mass-storage-file.sh b/mass-storage-file.sh
new file mode 100755 (executable)
index 0000000..5a32bfa
--- /dev/null
+++ b/mass-storage-file.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+
+FILE=/sys/kernel/config/usb_gadget/g1/configs/c.1/mass_storage.usb0/lun.0/file
+
+if [ -z "$1" ] ; then
+       echo "EJECT "`cat $FILE`
+       sudo sh -c "echo '' > $FILE"
+elif [ -e "$1" ] ; then
+       sudo sh -c "readlink -f $1 > $FILE"
+       echo "INSERT "`cat $FILE`
+else
+       echo "Usage: $0 /path/to/disk.img"
+       exit 1
+fi
+