Eject USB Drive from command line (ReadyNAS 102) [UPDATE]

Hardware: Netgear ReadyNAS 102. (firmware 6.10.4)

UPDATE:
This is an update to the script in my original post (https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/Eject-USB-Drive-from-command-line-ReadyNAS-102/td-p/1031498).

I originally wrote this because I could not get umount to work consistently. This script uses the same USB unmount process as the admin web front-end, so is very reliable.

With shell access to your NAS, you can list the USB mounted drives using the following:

# ls -l /media/
total 8
drwxrwxrwx 1 root root 8192 Feb 24 22:19 USB_HDD_3

To unmount using the script, do the following:

# ./usb_eject.sh /media/USB_HDD_3
USB_device=sdc1

Now the drive is unmounted:

# ls -l /media/
total 0

usb_eject.sh

#!/bin/bash

envecho() {
	echo ${1}=${!1}
}

usb_pattern=${1%/}

[[ -z ${usb_pattern} ]] && {
	echo
	echo   "need path to USB device"
	echo   "  eg  $ usb_eject.sh /media/USB_FLASH_6"
	echo
	exit 2
}

# Get device from mountpoint eg /media/USB_FLASH_6
USB_device=$(lsblk -P -o NAME,MOUNTPOINT  |sed -n "s|^NAME=\"\([^\"]*\)\"  *MOUNTPOINT=\"${usb_pattern}\"|\1|p")

[[ -z ${USB_device} ]] && {
	# Ok, that didn't work; how about /run/nfs4/media/USB_FLASH_6?
	USB_device=$(lsblk -P -o NAME,MOUNTPOINT  |sed -n "s|^NAME=\"\([^\"]*\)\"  *MOUNTPOINT=\"/run/nfs4${usb_pattern}\"|\1|p")

	# Out of ideas, exit
	[[ -z ${USB_device} ]] && {
		echo "Cannot detect USB device using lsblk -P -o NAME,MOUNTPOINT"
		exit 1
	}
}

envecho USB_device

# Call event_push to eject the USB device as done from admin console
# event_push logs to /var/log/readynasd/event_push.log
event_push shell readynasd "<xs:delete-s resource-type=\"HotPlug\" resource-id=\"UsbStorage\" action=\"eject\" device=\"${USB_device}\"></xs:delete-s>" 1 1

exit $?

Hope this helps