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#!/usr/bin/env bash
# Script to setup screens on login and lid-switch-action
# Uses autorandr to determine which screens are connected and which to setup.
#
# Per default a configuration named "default" will be used, if the computer is
# a laptop and not docked.
# A configuration named "docked-closed" will be used during login, when the lid
# is closed and docked.
# A configuration named "docked-all" will be used during login, when the lid
# is open and docked.
set -e -u
lid_state=""
fingerprint=""
action=""
x_user=""
display=""
current_user=""
path=""
# get DISPLAY number
get_display()
{
display=$(pgrep -a Xorg|cut -d':' -f2| cut -d' ' -f1)
}
# get current user running X
get_x_user()
{
x_user="$(loginctl list-sessions --no-legend| grep "seat"| awk '{print $3}')"
}
# get current user running this script
get_current_user()
{
current_user="$(whoami)"
}
# get full path to this script
get_path()
{
path="$0"
}
# Get current lid state ("open" or "closed")
function get_lid_state()
{
if [ -r "/proc/acpi/button/lid/LID/state" ]; then
lid_state="$(awk '{print $2}' /proc/acpi/button/lid/LID/state)"
fi
}
# Get current docking state ("true" or "false")
function is_docked()
{
if command -v busctl > /dev/null; then
busctl introspect org.freedesktop.login1 /org/freedesktop/login1| grep -E '^.Docked'| awk '{print $4}'
else
echo false
fi
}
# Get the md5sum of the current autorandr fingerprint
function get_setup_fingerprint()
{
fingerprint="$(autorandr --fingerprint| md5sum| cut -d ' ' -f 1)"
}
# Get the md5sum of a autorandr configuration
function get_configuration_fingerprint()
{
local fingerprint=""
if [ -r "$HOME/.config/autorandr/$1/setup" ]; then
fingerprint="$(md5sum "$HOME/.config/autorandr/$1/setup"| cut -d ' ' -f 1)"
fi
echo "$fingerprint"
}
function set_configuration()
{
local state=0
# if the computer is docked
if is_docked ; then
# if there's a lid-switch action
if [ -n "$action" ]; then
case "$action" in
"open")
if [ "$(get_configuration_fingerprint 'docked-all')" == "$fingerprint" ]; then
echo "Loading docked-all."
state=1
autorandr -l docked-all
fi
;;
"close")
if [ "$(get_configuration_fingerprint 'docked-closed')" == "$fingerprint" ]; then
echo "Loading docked-closed."
state=1
autorandr -l docked-closed
fi
;;
esac
else
# check the lid state
case "$lid_state" in
"open")
if [[ $(get_configuration_fingerprint "docked-all") == "$fingerprint" ]]; then
echo "Loading docked-all."
state=1
autorandr -l docked-all
fi
;;
"closed")
if [[ $(get_configuration_fingerprint "docked-closed") == "$fingerprint" ]]; then
echo "Loading docked-closed."
state=1
autorandr -l docked-closed
fi
;;
*)
echo "Your computer is docked but has no lid?!"
exit 1
;;
esac
fi
# else if not docked
else
if [ "$action" = "open" ]; then
if [[ $(get_configuration_fingerprint "external") == "$fingerprint" ]]; then
echo "Loading external."
state=1
autorandr -l external
fi
fi
fi
# if the screen still has not been setup, try using default
if [ $state -ne 1 ]; then
if [[ $(get_configuration_fingerprint "default") == "$fingerprint" ]]; then
echo "Loading default."
autorandr -l default
fi
fi
}
# check if autorandr is installed
if [ ! -x "/usr/bin/autorandr" ]; then
echo "Autorandr is not installed."
exit 1
fi
# get (lid-switch) action from parameter ("open" or "close")
if [ "$#" -eq 1 ]; then
action="$1"
fi
logger "Calling 'setup_screens'"
get_x_user
get_display
get_current_user
get_path
# Export Xorg DISPLAY and XAUTHORITY
export DISPLAY=":$display"
export XAUTHORITY="/home/$x_user/.Xauthority"
# if the script caller is the current X user or root (and lightdm is the current X user)
if [ "$current_user" == "$x_user" ]; then
get_lid_state
get_setup_fingerprint
set_configuration
elif [ "$current_user" == "root" ]; then
logger "Running $path as user $x_user now."
runuser -l "$x_user" -c "$path"
else
echo "$current_user is not currently running X and is not allowed to let the current X user run this script."
exit 1
fi
exit 0
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