Notify-Send Command Doesn't Launch The Notification Through Systemd Service

notify-send command doesn't launch the notification through systemd service

After asking a colleague, it seems that the DBUS_SESSION_BUS_ADDRESS variable is not available when script is run from service. Just adding the export command as follow to the script is enough:

#!/bin/bash
export DBUS_SESSION_BUS_ADDRESS="${DBUS_SESSION_BUS_ADDRESS:-unix:path=/run/user/${UID}/bus}"
notify-send "Hello World"

Apparently, in the service file, Environment is not necessary.

notify-send not working (in script) executed from udev

The main problem is, that the udev-rule will not run in any xorg-related environment per default, thus not knowing which DISPLAY to use. Therefore it will always fail, if You want to echo something into a terminal like a gnome-terminal for example. The script, which shall be executed on the udev-rule-match, must prior to any ui-related execution first export the DISPLAY.
This is done via

export DISPLAY=:0

I assume, that this also will be the problem, and notify-send will just run against the wall.

I am actually also playing with udev-rules, and I managed it to work, though i am acting as root, similar to my answer and this one found already here :

https://unix.stackexchange.com/questions/80882/udev-running-a-shellscript-that-accesses-an-x-display

And also here

Scripts launched from udev do not have DISPLAY access anymore?

You might want also to check zenity. Very helpful for small notifications

The command of 'notify-send' does not work in supervisor

Proper environment variables need to be set (DISPLAY & DBUS_SESSION_BUS_ADDRESS). You can do it in many different ways, depending on your needs, like e.g.

a) per subprocess

import os

os.system('DISPLAY=:0 DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus notify-send hello')

b) in script globally

import os

os.environ['DISPLAY'] = ':0'
os.environ['DBUS_SESSION_BUS_ADDRESS'] = 'unix:path=/run/user/1000/bus'
os.system('notify-send hello')

c) in supervisor config per program

[program:test_notify]
;
; your variables
;
user=john
environment=DISPLAY=":0",DBUS_SESSION_BUS_ADDRESS="unix:path=/run/user/1000/bus"

The above examples have a couple of assumptions (you may want to change these settings accordingly):

• script is run as user john
• UID of user john is 1000
• notification appear on display :0

To run script as root and show notification for regular user, use sudo as described on Arch wiki Desktop_notifications.

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