i3 screen lock

i3lock.sh

#!/bin/bash

# depends: scrot imagemagick keychain rivalctl

# Take a screenshot
scrot /tmp/lockshot.png

# Apply pixellation effect
convert /tmp/lockshot.png -scale 5% -scale 2000% /tmp/lockshot-pixel.png

# Set mouse LED colour to red
rivalcfg -E 4 -e 4 -c red -C red

# Securely delete the unaltered screenshot
shred -u /tmp/lockshot.png &

(
  # Lock the screen
  i3lock -nei /tmp/lockshot-pixel.png
  
  # Set mouse LEDs back to normal after i3lock exits
  rivalcfg -c '#40ffff' -C '#6000ff' -e 1 -E 1
) &

# Put screens to sleep after 10 minutes if the lock is still active
( 
  sleep 600
  pgrep i3lock && xset dpms force off && keychain -k all
) &