Hello everybody,
my scenario: in my company 6 colleagues are working in the same office
building as I am and 2 are only working from their home office. We are
all using the same server placed "out of sight" in an other building and
are connected via x2go (TCE in the office) to the server.
The server (running UBUNTU 14.04) is protected against power loss by an
ups that is monitored via usb and NUT on the server. The problem is to
send messages regarding critical conditions (e.g. power loss) to all -
via x2go - connected users. This is necessary because the NUT NOTIFYCMD
script starts a controlled shutdown sequence (putting several running
virtual machines to safestate a.s.o. and finally shutting down the
server) after 3 minutes running on battery.
These messages are send by nut via wall automatically but this is not
the way as none of the users has open a terminal - all are working under
their LXDE/OpenBox GUI.
I asked the internet but only found one hint - and I have to say thanks
to Timotheus Pokorra
<https://www.blogger.com/profile/05259914906217943114> who gave me the
direction with his post:
http://tpokorra.blogspot.de/2013/07/notify-all-users-logged-in-over-x2go-on.html
I tested this and it did not work - so I designed the following solution:
(this will be a /THE part of the notifycmd script from nut)
#!/bin/bash
#
# NUT NOTIFYCMD script
PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/sbin:/usr/local/bin
# ...
#if [ "$NOTIFYTYPE" = "ONBATT" ]
#then
# compose message for wall
message="$(date "+%d.%m.%Y - %H:%M:%S ")$(cat
/usr/local/bin/eam01.txt)"
echo $message | wall
# send message to admin by e-mail
echo 'EAM - '$HOSTNAME' - '$(date)' Benutzer: '$USER 'USV meldet
STROMAUSFALL / ONBATT !' | mail -s 'EAM from'$HOSTNAME ad...@xxxxx.xx
# get infos for x2go-user-information
benutzer=`ps xaf | grep x2goagent | grep -v grep | awk ' { print
( $(NF-2) ) }' FS='-'` # get the user names
screens=`ps xaf | grep x2goagent | grep -v grep | awk ' { print (
$(NF-1) ) }' FS='-'` # get the user displays
USERCOUNT="$(echo $benutzer | wc -w)"
# number of users / loops
# start loop / action for every logged in x2go-user
START=1
i=$START
while [[ $i -le $USERCOUNT ]]
do
user=`echo $benutzer | awk -v a=$i '{print $a}'` #
transfer contents (word 1,2,3...) of $benutzer to $user
display=":"`echo $screens | awk -v a=$i '{print $a}'`".0"
# compose $display (word 1,2,3... from $screens)) ":" & number from
$screens & ".0"
# send message to each x2go-user
sudo -u $user -S -H sh -c "zenity --text-info --html
--display=$display --filename=/usr/local/bin/eam01.txt"
</usr/local/bin/pw.txt &
((i = i + 1))
done
## Loop with one second interval to allow SIGTERM reception.
#let "n = 180"
#while [ $n -ne 0 ]
#do
# sleep 1
# let "n--"
#done
#echo $0: commencing shutdown | wall
# upsmon -c fsd
#fi
I know that regarding the safety questions it is not ok to read a sudo
password from a file ... we must not discuss this - but I would be glad
for any better idea - btw I know the possibilities of changes in the
sudoers file but don't want this at the moment.
As messages I use text files because this gives me the possibility (with
zenity) to use html and the users finally see this popup:
If someone is interested please feel free to use and test it. I would be
very much interested if someone has a better / simple solution or would
be thankful for every hint regarding the improvement of the code.
For the time being I tested this not within the notifycmd script - I
tested the interesting parts in a separate script (simulating the
notifycmd / notifytype condition) within a test environment. My
life-system-test has to wait until the weekend...
Best regards
Christian
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