Plymouth theme preview tool for Debian/Ubuntu

plymouth-preview

#!/bin/bash

# Check root
if [ ! $( id -u ) -eq 0 ]; then
	echo Must be run as root. Trying sudo $0 $@
	exec sudo $0 $@
	exit $?
fi

# Install dependencies
function install_pkg() {
	dpkg -l "$1" 2>/dev/null >/dev/null || apt-get install "$1" -yq
}
install_pkg x11-apps
install_pkg xserver-xephyr
install_pkg plymouth-x11
install_pkg imagemagick
install_pkg xdotool 

# Configure duration of display
DURATION=100

# Open a window dedicated for preview
Xephyr :1 -ac -screen 1920x1080 -fullscreen -name 'plymouth-x11' -title 'plymouth-x11' &
WPID=$!
export DISPLAY=:1

# Get current theme
THEME=$(cat /etc/plymouth/plymouthd.conf | grep ^Theme | cut -f 2 -d=)
echo "Previewing theme $THEME"

# Launch plymouthd
plymouthd

# Force a screen update by simulating mouse movement 
function mouse_move() {
	xdotool mousemove 100 $RANDOM
}

# Saves the content window as PNG
function screencap() {
	XWD=/tmp/plymouth-$THEME-preview-$1.xwd
	PNG=/tmp/plymouth-$THEME-preview-$1.png
	DISPLAY=:0 xwd -name "plymouth-x11" -out "$XWD" 
	convert -resize 1280x768 "$XWD" "$PNG"
	rm -rvf "$XWD"
}

# Simulate boot animation
plymouth show-splash
for ((I=0; I<$DURATION; I++)); do
	plymouth --update=test$I
	plymouth system-update --progress=$I
	plymouth message --text="Preview of '$THEME' $I/$DURATION"
	mouse_move
	if [ $(( I % 25 )) -eq 0 -a $I -gt 0 ]; then
		screencap $((I+1))
	fi
	sleep 0.1
done
# Simulate password request
plymouth ask-for-password \
	--command='/bin/true' \
	--prompt='Inform password to decrypt volume' &
xdotool key --repeat 6 --delay 100 a ; sleep 1
mouse_move
screencap 100-input 
xdotool key Return 

# Exit plymouth and close window
plymouth quit
kill -9 $WPID
echo "Preview screenshots saved at /tmp/"