suspend / hibernate on inactivity with multiple users

[mmehnert]

I have a machine that is started on request via wake on lan and used by multiple users via xrdp. I want the machine to suspend to ram after nobody has been active for some amount of time. I think this works correctly as long as only one person has an active xrdp session.

From what I can observe, if there are multiple xrdp sessions, the machine suspends to ram as soon as one of the sessions reaches its inactivity timeout as set in the gnome power management settings.

I could not find any information online about this topic and my hunch is that it's not really an xrdp bug. But it's related to it's use.
Has anybody confronted this problem or does anybody know if there is a way to propagate user activity to get the wanted result (only suspend when all xrdp sessions have been idle)?

[mmehnert]

So I did the following:
I removed the polkit file that allowed all users to shutdown/suspend the machine.
On startup I run the following script:

#!/bin/bash

pattern="/var/run/xrdp/sockdir/*/xrdp_display*"
#30min timeout to shutdown when idle
timeout=1800000 

#wait 15min after startup
sleep 900

while true; do

suspend=true
if ls $pattern >/dev/null 2>&1; then
    for file in $pattern; do
        number=$(basename "$file" | grep -o '[0-9]\+$')
        
        owner=$(stat -c '%U' "$file")
        
        echo "File: $(basename "$file")"
        echo "Owner: $owner"
        echo "Display-ID: $number"
	export DISPLAY=:$number 
	idle=`sudo -u $owner xprintidle`
	echo  "Idle: $idle"

        echo "----------------"
	if  [ $idle -lt $timeout ]; then
	  suspend=false
	  break
	fi
    done
else
    echo "No xrdp sessions found."
fi

if [ $suspend == true  ]; then
  echo suspend
  pm-suspend 
  sleep 120
fi

sleep 60

done

At the moment it only checks xrdp sessions which is relevant for me at the moment. If all idle times are above a given threshold, the machine suspends. Maybe I'll adjust later to include other interactive sessions if there is a need.