#!/bin/bash
modprobe libcomposite
cd /sys/kernel/config/usb_gadget/
mkdir -p g1 && cd g1

# Standard USB descriptors
echo 0x1d6b > idVendor
echo 0x0104 > idProduct
echo 0x0100 > bcdDevice
echo 0x0200 > bcdUSB

mkdir -p strings/0x409
echo "TALIA003512M" > strings/0x409/serialnumber
echo "Debian" > strings/0x409/manufacturer
echo "EmulatedDrive" > strings/0x409/product

mkdir -p configs/c.1/strings/0x409
echo "Storage and Serial" > configs/c.1/strings/0x409/configuration
echo 500 > configs/c.1/MaxPower

mkdir -p functions/mass_storage.usb0
echo 1 > functions/mass_storage.usb0/stall
echo 1 > functions/mass_storage.usb0/lun.0/removable
# CRITICAL: Forces target PC to treat it as Read-Only
echo 1 > functions/mass_storage.usb0/lun.0/ro 

echo /usb_share.img > functions/mass_storage.usb0/lun.0/file
ln -sf functions/mass_storage.usb0 configs/c.1/

# Serial connection
mkdir -p functions/acm.usb0
ln -sf functions/acm.usb0 configs/c.1/

# Bind to the physical controller to make it appear on the reading PC
echo $(ls /sys/class/udc/) > UDC