On Wed, Oct 31, 2012 at 03:28:04PM -0400, John Hupp 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.
live well,
vagrant
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