vglserver_config: Don't modify lightdm.conf

(Create a configuration file under /etc/lightdm/lightdm.conf.d instead.)

Closes #278

Author: dcommander

ChangeLog.md

@@ -14,6 +14,10 @@ attempting to run a GLX application using the EGL back end and `vglrun -nodl`.
 3. Fixed an issue whereby the VirtualGL Configuration dialog did not pop up if
 the Num Lock key was on.
 
+4. `vglserver_config` now creates a configuration file under
+**/etc/lightdm/lightdm.conf.d** rather than modifying
+**/etc/lightdm/lightdm.conf**.
+
 
 3.1.2
 =====

server/vglserver_config

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # Copyright (C)2007 Sun Microsystems, Inc.
-# Copyright (C)2009-2014, 2016, 2018-2020, 2022-2023 D. R. Commander
+# Copyright (C)2009-2014, 2016, 2018-2020, 2022-2023, 2025 D. R. Commander
 #
 # This library is free software and may be redistributed and/or modified under
 # the terms of the wxWindows Library License, Version 3.1 or (at your option)
@@ -220,23 +220,6 @@ addvglgenkey()
 	fi
 }
 
-addvglgenkey_lightdm()
-{
-	backup $1
-	if [ "$VGLUSERSONLY" = "1" ]; then
-		echo ... Adding greeter-setup-script=vglgenkey to $1 ...
-	else
-		echo ... Adding greeter-setup-script=xhost \+LOCAL\: to $1 ...
-	fi
-	removeline $1 display-setup-script
-	removeline $1 greeter-setup-script
-	if [ "$VGLUSERSONLY" = "1" ]; then
-		addtoconf $1 "Seat:seat*" "Seat:seat\*" greeter-setup-script=$VGLGENKEY
-	else
-		addtoconf $1 "Seat:seat*" "Seat:seat\*" "greeter-setup-script=xhost +LOCAL:"
-	fi
-}
-
 disablextest()
 {
 	if [ -z "$1" ]; then
@@ -683,10 +666,9 @@ EOF
 			delvglgenkey $file
 		fi
 	done
-	if [ -f /etc/lightdm/lightdm.conf ]; then
-		echo "... Removing X server access from /etc/lightdm/lightdm.conf ..."
-		removeline /etc/lightdm/lightdm.conf display-setup-script
-		removeline /etc/lightdm/lightdm.conf greeter-setup-script
+	if [ -f /etc/lightdm/lightdm.conf.d/99-virtualgl.conf ]; then
+		echo "... Removing /etc/lightdm/lightdm.conf.d/99-virtualgl.conf ..."
+		rm /etc/lightdm/lightdm.conf.d/99-virtualgl.conf
 	fi
 	for dir in /usr/share/gdm/greeter/autostart \
 		/usr/local/share/gdm/greeter/autostart; do
@@ -899,11 +881,15 @@ EOF
 			addvglgenkey $file
 		fi
 	done
-	if [ -f /etc/lightdm/lightdm.conf ]; then
-		addvglgenkey_lightdm /etc/lightdm/lightdm.conf
-	elif [ -d /etc/lightdm ]; then
-		echo [SeatDefaults] >/etc/lightdm/lightdm.conf
-		addvglgenkey_lightdm /etc/lightdm/lightdm.conf
+	if [ -d /etc/lightdm/lightdm.conf.d ]; then
+		echo ... Creating /etc/lightdm/lightdm.conf.d/99-virtualgl.conf ...
+		echo "[Seat:seat*]" >/etc/lightdm/lightdm.conf.d/99-virtualgl.conf
+		if [ "$VGLUSERSONLY" = "1" ]; then
+			echo "greeter-setup-script=$VGLGENKEY" >>/etc/lightdm/lightdm.conf.d/99-virtualgl.conf
+		else
+			echo "greeter-setup-script=xhost +LOCAL:" >>/etc/lightdm/lightdm.conf.d/99-virtualgl.conf
+		fi
+		chmod 644 /etc/lightdm/lightdm.conf.d/99-virtualgl.conf
 	fi
 	for dir in /usr/share/gdm/greeter/autostart \
 		/usr/local/share/gdm/greeter/autostart; do