While building up a raspberry pi system recently I needed an easy way to shutdown the device without having to ssh into it.
I had an idea pop into my head, what if I plug in a usb drive and maybe it automatically runs a script on the usb key, or something and powers the device down.
Well after a bit of googling it turns out.... you can use udev rules to do what I want, and no need to put anything on my drive.
This is the process.
First, you figure out the vendor ID and the product ID of the usb key.
The way I did this was by running lsusb and noting the devices, since this is a raspberry pi, the list was short.
I then plugged the usb drive in, and ran lsusb again. I noted which device it was.
Then I ran lsusb -v to get the values for idVendor and idProduct.
I then copied them into this line (remember not to include the 0x), in the applicable spots.
ACTION=="add" , ATTRS{idProduct}=="2168" , ATTRS{idVendor}=="0ea0" , RUN+="/usr/local/bin/my_shutdown_script.sh"I then placed that line into this file:
sudo nano /etc/udev/rules.d/99-usb-shutdown.rulesNext, I edited /usr/local/bin/my_shutdown_script.sh to contain the following:
#!/bin/sh
sudo shutdown -h now
Finally I ran
sudo chmod +x /usr/local/bin/my_shutdown_script.sh
on the file and rebooted, just to make sure everything was stable.
Now when I plug in the usb drive, bam, it just shuts down.
Thanks to this post for the details they used, which was exactly what I did with the minor note that I used lsusb -v (they just mentioned using lsusb ;))!
https://www.reddit.com/r/linuxquestions/comments/yiw13c/trying_to_create_a_udev_event_to_safely_shutdown/
