i3lock-wait-for-suspend

i3lock-wait-for-suspend

#!/bin/sh

DBUS_NAME="org.freedesktop.login1"
DBUS_PATH="/org/freedesktop/login1"
DBUS_INTERFACE="org.freedesktop.login1.Manager"
DBUS_SIGNAL="PrepareForSleep"

INHIBITOR_PIDS=

install_background_inhibitor() {
	systemd-inhibit --what sleep --mode delay \
		--who $0 --why "i3lock before suspend" \
		tail -f /dev/null &

	# There should be a better way...
	pid=$!
	pgid=`ps x -o "%r %p" | grep "$pid$" | cut -d' ' -f2`
	tail_pid=`ps x -o "%p %r %c" | grep "$pgid.*tail$" | cut -d' ' -f2`
	INHIBITOR_PIDS="$pid $tail_pid"
}

kill_background_inhibitor() {
	kill $INHIBITOR_PIDS
}

trap kill_background_inhibitor INT TERM

install_background_inhibitor

gdbus monitor --system \
	      --dest $DBUS_NAME \
	      --object-path $DBUS_PATH | while read line; do
	if echo "$line" | grep -q "$DBUS_INTERFACE.$DBUS_SIGNAL"; then
		if echo "$line" | grep -q true; then
			i3lock
			kill_background_inhibitor
		else
			install_background_inhibitor
		fi
	fi
done