Overview: I have my own backup script which writes to an external USB drive, which was ported from a previous NAS server. It is scheduled using cron at midnight. When the backup completes, it unmounts the USB drive and sends me a mail.
Problem: This worked fine for a few years, but I experienced a problem with Firmware 6.4.0; Once the backup completes, if I unplugged the external drive without first using the eject feature from the admin web front-end, the NAS became unresponsive and required a reboot. This issue resolved when I applied firmware 6.4.1. When I looked at the release notes for 6.4.1, it recommended I eject the external drive from the web admin console. Not a major problem, but I'd rather not boot up a PC just to hit the eject in the Web admin console.
Goal: How do I reproduce, in a shell script, the eject feature on the web admin console.
After a bit of digging, I managed to write a reasable solution.
To save anyone else the pain of solving this, here's the script I use. Usual disclaimers apply.
usb_eject.sh
#!/bin/bash
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")
# Exit if device name not found
[[ -z ${USB_device} ]] && {
echo "Cannot detect USB device using lsblk -P -o NAME.MOUNTPOINT"
exit 1
}
# Call event_push to eject the USB device as done from admin console
# event_push logs to /var/log/readynasd/event_push.log
event_push shell readynasd "<xs:delete-s resource-type=\"HotPlug\" resource-id=\"UsbStorage\" action=\"eject\" device=\"${USB_device}\"></xs:delete-s>" 1 1
exit $?
