xscreensaver-wait-for-unlock

xscreensaver-wait-for-unlock

#!/bin/bash

# Run this script under `setsid -w` to avoid killing parent processes
# e.g. your lock script and xfsettingsd

set -u

# Kill `xscreensaver-command -watch` when we exit
# https://stackoverflow.com/a/22644006/738390
trap "exit" INT TERM
trap "kill 0" EXIT

# Protect against potential xscreensaver-command -watch crashes
while true; do
	# https://unix.stackexchange.com/questions/166546/bash-cannot-break-out-of-piped-while-read-loop-process-substitution-works
	while read line; do
		if echo -E "$line" | grep -q "^UNBLANK "; then
			# Make sure the screen is actually unlocked
			xscreensaver-command -time | grep -q " screen non-blanked since " && exit 0 || echo "saw UNBLANK but screen was not unlocked"
		fi
	done < <(xscreensaver-command -watch)
	echo "crashed, restarting: xscreensaver-command -watch"
done

Without the kill 0: https://gist.github.com/ivan/2453278021229bc5ff71c01c727e0da7