dotfiles/scripts/.local/bin/lockscreen

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#!/usr/bin/env bash
# locker script -- makes sure that x does not give up the lock easily (using i3lock)
# simply locks the screen on wayland (using waylock)
## CONFIGURATION ##############################################################
is_wayland() {
# alternative $(</proc/self/sessionid), see
# https://stackoverflow.com/questions/3214935/can-a-bash-script-tell-if-its-being-run-via-cron
if loginctl show-session "$(loginctl show-user "$(whoami)" -p Display --value)" -p Type --value | grep -q wayland; then
true
else
false
fi
}
# Options to pass to i3lock
i3lock_options="-e -f -c 1d2021"
waylock_options="-init-color 0x223344 -input-color 0x224444 -fail-color 0x554444 -fork-on-lock"
# Run before starting the locker
pre_lock() {
# pause all currently playing media and mute system
type mpc >/dev/null 2>&1 && mpc -q pause
type playerctl >/dev/null 2>&1 && playerctl -s pause
type amixer >/dev/null 2>&1 && amixer -q set Master mute
return
}
# Run after the locker exits
post_lock() {
return
}
###############################################################################
pre_lock
if is_wayland; then
# shellcheck disable=SC2086
waylock $waylock_options
elif [ -e "/dev/fd/${XSS_SLEEP_LOCK_FD:--1}" ]; then
# On X, we set a trap to kill the locker if we get killed, then start the locker and
# wait for it to exit. The waiting is not that straightforward when the locker
# forks, so we use this polling only if we have a sleep lock to deal with.
kill_i3lock() {
pkill -xu "$EUID" "$@" i3lock
}
trap kill_i3lock TERM INT
# we have to make sure the locker does not inherit a copy of the lock fd
i3lock "$i3lock_options" {XSS_SLEEP_LOCK_FD}<&-
# now close our fd (only remaining copy) to indicate we're ready to sleep
exec {XSS_SLEEP_LOCK_FD}<&-
while kill_i3lock -0; do
sleep 0.5
done
else
trap 'kill %%' TERM INT
i3lock -n "$i3lock_options" &
wait
fi
post_lock