On 07/11/2012, at 5:28 AM, ltsp-discuss-requ...@lists.sourceforge.net wrote:
>> For a Lubuntu LTSP network powered by a UPS, during a power outage I want to
>> notify all users in all X sessions with a popup message saying that the
>> system
>> is running on battery and about to be shut down.
> ...
>> I imagine that there is already a developed method for handling a job like
>> that, using either notify-send or something else.? Can anyone point the way?
>
> You could start something from /etc/X11/Xsession.d/ that runs in the
> background and waits for the presence of a file, and if the file is present,
> displays the contents of the file. Drop something like this in
> /etc/X11/Xsession.d/60-notify-of-ups-shutdown:
>
> check_and_notify(){
> # Sleep for 10 seconds
> while sleep 10 ; do
> # check for file...
> if [ -f /var/run/ups-shutdown ]; then
> # Display file to user.
> xmessage -file /var/run/ups-shutdown
> return $?
> fi
> done
> }
> check_and_notify &
>
> And then your UPS monitoring software should write something to
> /var/run/ups-shutdown...
>
> There's probably a more elegant way, but hopefully that helps as a simple
> proof
> of concept.
I'd look to see how shutdown broadcasts a message ... but for your case
shutdown already does that ie
message to say power fail, on UPS, shutdown in 90seconds (whatever)
broadcast to every user console or xterm (I've not tried a session without a
terminal)
James
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