Executing program from event hook trigger

[joeyda3rd]

I can't seem to figure out how to execute a compiled program from the event hook triggers in configure.yaml.

I have a custom built LED panel that I want to turn on and off with the prints using the RPi's GPIO, which requires a custom library (so enclosure won't work, hence the scripts). I am relatively newer to Linux, so I'm guessing it's a misunderstanding on how to run the shell commands from the octoprint instance due to file permissions?

I have verified that executing the programs from the command line do turn on/off the LEDs (but they do require super user permissions or I get "Can't open /dev/mem: Permission denied") and that all users (chmod a+x) have executable permissions to these executables.

config.yaml snippet

events:
  subscriptions:
  - command: ~/LED_on
    event: PrintStarted
    type: system
  - command: ~/LED_off
    event:
    - PrintFailed
    - PrintDone
    - PrintCancelled
    type: system

ls -l
-rwxr-xr-x  1 pi pi 8516 Jul 20 16:54 LED_off
-rwxr-xr-x  1 pi pi 8636 Jul 20 17:03 LED_on

Running latest version of octopi install

[jneilliii]

if it requires sudo then you will have to adjust the sudoers for the executable to allow running it without.

[jneilliii]

and you'll probably want to use the full path /home/pi/LED_on and /home/pi/LED_off instead of the tilde shortcut, just to be safe.

[jneilliii]

• Create a file /etc/sudoers.d/LED_on (as root) with the following contents:
  pi ALL=NOPASSWD: /home/pi/LED_on
• Create a file /etc/sudoers.d/LED_off (as root) with the following contents:
  pi ALL=NOPASSWD: /home/pi/LED_off