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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 "internal" 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-open" will be used during login, when the lid
# is open and docked.
set -e -u
lid_state=""
docking_state=""
fingerprint=""
action=""
x_user=""
current_user=""
path=""
# 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="$0"
}
# Get current lid state ("open" or "closed")
function get_lid_state()
{
if [ -r "/proc/acpi/button/lid/LID/state" ]; then
lid_state="$(cat /proc/acpi/button/lid/LID/state|awk '{print $2}')"
fi
}
# Get current docking state ("true" or "false")
function get_docking_state()
{
if [ -x "/usr/bin/busctl" ]; then
docking_state="$(busctl introspect org.freedesktop.login1 /org/freedesktop/login1|grep "\.Docked"|awk '{print $4}')"
fi
}
# Get the md5sum of the current autorandr fingerprint
function get_setup_fingerprint()
{
fingerprint="$(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 [ "$docking_state" = "true" ]; then
# if there's a lid-switch action
if [ -n "$action" ]; then
case "$action" in
"open")
if [ $(get_configuration_fingerprint "docked-open") == "$fingerprint" ]; then
echo "Loading docked-open."
state=1
autorandr -l docked-open
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 [[ $(get_configuration_fingerprint "docked-open") == "$fingerprint" ]]; then
echo "Loading docked-open."
state=1
autorandr -l docked-open
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 internal
if [ $state -ne 1 ]; then
if [[ $(get_configuration_fingerprint "internal") == "$fingerprint" ]]; then
echo "Loading internal."
autorandr -l internal
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="$1"
fi
logger "Calling 'setup_screens'"
get_x_user
get_current_user
get_path
# Export Xorg DISPLAY and XAUTHORITY
export DISPLAY=$(ls /tmp/.X*|grep "lock"|cut -d '.' -f2| cut -d '-' -f1|sed -e 's/X/:/')
export XAUTHORITY="$(eval echo ~$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" ] || [ $current_user = "root" -a $x_user = "lightdm" ]; then
get_lid_state
get_docking_state
get_setup_fingerprint
set_configuration
else
if [ $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
fi
exit 0
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