Custom i3lock and autolock on suspend

README.md

Screen locker

A custom script that triggers a screen lock, suspending dunst notifications.

Also provides a systemd unit that executes the lock script upon system suspend.

Prerequisites

• i3lock
• dunst

Files

systemd

• /usr/local/lib/systemd/system/autolock@.service

custom scripts

• $HOME/bin/lock.sh
• $HOME/bin/notification.sh

Note that I3LOCK_BACKGROUND in lock.sh should be configured as desired.

autolock@.service

[Unit]
Description=Lock the screen on resume from suspend
Before=sleep.target suspend.target

[Service]
User=%i
Type=exec
Environment=DISPLAY=:0
ExecStart=/home/%i/bin/lock.sh

[Install]
WantedBy=sleep.target suspend.target

lock.sh

#!/bin/sh

I3LOCK_BACKGROUND=/tmp/lock-bg.png

if [[ $(pgrep -u $UID -x i3lock) ]] ; then
  echo "The screen is already locked. Exiting."
  exit
fi

prior_state=`cat $HOME/.notifications-state`

# Pause notifications if they are currently enabled
if [ $prior_state = "ACTIVE" ] ; then
  $HOME/bin/notifications.sh off
fi

xbacklight > $HOME/.xbacklight-lock
xbacklight -set 50
i3lock -n -i $I3LOCK_BACKGROUND
xbacklight -set $(cat $HOME/.xbacklight-lock)

# Resume notifications if they were enabled before locking
if [ $prior_state = "ACTIVE" ] ; then
  $HOME/bin/notifications.sh on
fi

notifications.sh

#!/bin/sh

on() {
  pkill -U $UID -USR2 dunst
  echo "ACTIVE" > $HOME/.notifications-state
}

off() {
  pkill -U $UID -USR1 dunst
  echo "INACTIVE" > $HOME/.notifications-state
}

if [ "$1" = "on" ] ; then
  on
elif [ "$1" = "off" ] ; then
  off
else
  if [ $(cat $HOME/.notifications-state) = "ACTIVE" ] ; then
    off
  else
    on
  fi
fi