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#!/bin/sh
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PATH=/usr/sbin:/usr/bin
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# $1 = session number
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function get_session_processes() {
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	local uid=$(loginctl show-session $1 | grep '^User=' | sed -r -e 's/^User=(.*)$/\1/')
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	systemd-cgls "/user.slice/user-${uid}.slice/session-${1}.scope"
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}
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# Check session status using systemd
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session_ids=$(loginctl list-sessions 2>/dev/null | awk '{print $1}')
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for session in ${session_ids} ; do
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	session_status=$(loginctl show-session ${session})
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	session_processes="$(get_session_processes ${session})"
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	echo "${session_status}" | grep -e 'Active=yes' &> /dev/null &&
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		echo "${session_processes}" | grep -e '\(gnome-settings-daemon\|cinnamon-settings-daemon\|kded[4-5]\|plasmashell\|xfce4-power-manager\|mate-power-manager\)' &> /dev/null && exit 0
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done
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# Get the ID of the first active X11 session: using ConsoleKit
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uid_session=$(
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ck-list-sessions 2>/dev/null | \
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awk '
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/^Session[0-9]+:$/ { uid = active = x11 = "" ; next }
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{ gsub(/'\''/, "", $3) }
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$1 == "unix-user" { uid = $3 }
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$1 == "active" { active = $3 }
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$1 == "x11-display" { x11 = $3 }
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active == "TRUE" && x11 != "" {
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	print uid
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	exit
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}')
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# Check that there is a power manager, otherwise shut down.
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[ "$uid_session" ] &&
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ps axo uid,cmd | \
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awk '
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    $1 == '$uid_session' &&
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        ($2 ~ /gnome-power-manager/ || $2 ~ /kpowersave/ ||
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        $2 ~ /mate-power-manager/ || $2 ~ /xfce4-power-manager/ ||
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        $2 ~ /\/usr\/libexec\/gnome-settings-daemon/ ||
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        $2 ~ /\/usr\/libexec\/cinnamon-settings-daemon/ ||
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        $2 ~ /kded[4-5]/ || $2 ~ /guidance-power-manager/ ||
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        $2 ~ /plasmashell/) \
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                { found = 1; exit }
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    END { exit !found }
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' ||
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  shutdown -h now
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