Feature: Notifications

[famfop]

Hi, I believe I once asked but maybe I am mistaking. So I was wondering if there is a way to get (custom?) notifications on mount / unmount? I am using the systemd service. If it is possible, I'd like to see a / some simple examples on how to configure it and I guess this would make people start using it easier.

[LemonBoy]

Please check out the manual, the -c option allows you to specify a custom script that ldm invokes every time a device is mounted/unmounted. The LDM_ACTION, LDM_FS, LDM_NODE and LDM_MOUNTPOINT environment variables are defined and should be enough to generate the notification blurb.

The only problem I see is that you might need to export the DISPLAY variable for notify-send to work from within the script.

[famfop]

Thanks, so do I need to export it inside the script or how would you do that?

[LemonBoy]

I guess something like

DISPLAY=:1 notify-send "Hello"

is enough, just make sure to export the correct display.

[famfop]

I have been trying different things and cannot get it going. I tried it the way you said, also setting DISPLAY=:0.0, DISPLAY=:0 and some other things but it didn't work. Do you have any idea?

[LemonBoy]

Not really, make sure the script is executable and is actually executed first.

[famfop]

I was on holiday and am back now. Let me summarize what I tried (unsuccesfully): I made a scriptfile and made it executable. My $DISPLAY variable said :0.0 so I was not sure and tried out DISPLAY=:0 notify-send "test", DISPLAY=:0.0 notify-send "test", for I don't know what reason DISPLAY=:1 notify-send "test" and also "plain" notify-send "test". I edited my systemd file (the ExecStart variable) such that it is ExecStart=/usr/bin/ldm -u ${MOUNT_OWNER} -p ${BASE_MOUNTPOINT} -c /path/to/executable/scriptfile.sh

I am still not able to get the output "test" from my notification daemon... Do you see any mistakes / are you able to get notifications?

EDIT: for the record, the mounting/unmounting works just as expected!

EDIT 2: I also just tried simply putting a echo 'hello' to my scriptfile and running the execstart-command in my terminal. I don't see the output so I am wondering if the -c flag works at all. Can you use it succesfully?

[LemonBoy]

There's no output at all, the file descriptors for stdin, stdout and stderr are closed before sh is invoked. Please check your syslog (journalctl or whatever) for ldm-related errors and try something like this to see if the commands are executed.

echo "Hello" > /tmp/check

[famfop]

Ok this worked, no error and the file was produced. But the notify-send just does not work. I went on reading and stumbled upon some posts seemingly having the same issue with udev rules. The problem seems to be the at startup missing DBUS_SESSION_BUS_ADDRESS. I read a bit and tried but I don't have too much time right know, so I just leave the - in my opinion - most helpful link here. The interesting part are the linked articles in Resources, mainly: notify-send bug and notify-send workaround.