This script is used on Archlinux:

This script takes the content of a usb's folder and syncs it locally on a machine. A progress image is displayed, a success image and a failure image is displayed accordingly.

You will require to setup a udev rule accordingly to set this up. This script was made for a very specific project to reuse it you will most likely need to tweak it a bit.

Dependencies for: Automatic mounting of usb device:

install udisks2 &&
install ldm aur

Detecting when the usb is connected and launching the script: Udev rule: https://unix.stackexchange.com/questions/229987/udev-rule-to-match-any-usb-storage-device