#!/bin/bash
# Christian Birchinger <cbirchinger@netswarm.net>
#
# Activate the users xscreensaver as root without an X11 environment (acpi events, cronjobs, etc.) defined.

export DISPLAY=:0
SAVETYPE="lock" # "lock" or "activate"

while read pid user command; do
	if [ "${command}" = "xscreensaver" ]; then
		export XAUTHORITY="`eval echo ~${user}/.Xauthority`" # xauth can't resolve ~user 
		if xscreensaver-command -time 2>&1 | grep -q " screen non-blanked since "; then
			#echo "blanking user ${user} now. xscreensaver pid: ${pid}. XAUTHORITY: ${XAUTHORITY}. DISPLAY: ${DISPLAY}." >/tmp/xssac-debug
			nohup xscreensaver-command -${SAVETYPE} >/dev/null 2>&1 &
		fi
	fi  
done < <(ps awwxho pid,user,comm)