bin/setup_screens: Adding (yet another) screen setup script. This time using autorandr and predefined configurations.

1 files changed, 166 insertions, 0 deletions

diff --git a/bin/setup_screens b/bin/setup_screens
new file mode 100755
index 0000000..1cdd143
--- /dev/null
+++ b/bin/setup_screens
@@ -0,0 +1,166 @@
+#!/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="$1"
+fi
+
+get_x_user
+get_current_user
+get_path
+# if the script caller is the current X user or root (and lightdm is the current X user)
+if [ "$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 [ $current_user = "root" ]; then
+    runuser -l "$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