Fix X11 tests broken by the removal of -ac

Probably missed a few. Also adding xauth to the system path (it was
already in the closure).

nixos/lib/test-driver/Machine.pm

@@ -543,7 +543,7 @@ sub waitForX {
         retry sub {
             my ($status, $out) = $self->execute("journalctl -b SYSLOG_IDENTIFIER=systemd | grep 'session opened'");
             return 0 if $status != 0;
-            ($status, $out) = $self->execute("xwininfo -root > /dev/null 2>&1");
+            ($status, $out) = $self->execute("[ -e /tmp/.X11-unix/X0 ]");
             return 1 if $status == 0;
         }
     });

nixos/modules/services/x11/xserver.nix

@@ -466,6 +466,7 @@ in
         xorg.xsetroot
         xorg.xinput
         xorg.xprop
+        xorg.xauth
         pkgs.xterm
         pkgs.xdg_utils
       ]

nixos/tests/gnome3-gdm.nix

@@ -32,6 +32,7 @@ import ./make-test.nix ({ pkgs, ...} : {
       $machine->succeed("getfacl /dev/snd/timer | grep -q alice");
 
       $machine->succeed("su - alice -c 'DISPLAY=:0.0 gnome-terminal &'");
+      $machine->succeed("xauth merge ~alice/.Xauthority");
       $machine->waitForWindow(qr/Terminal/);
       $machine->sleep(20);
       $machine->screenshot("screen");

nixos/tests/gnome3.nix

@@ -27,6 +27,7 @@ import ./make-test.nix ({ pkgs, ...} : {
       $machine->succeed("getfacl /dev/snd/timer | grep -q alice");
 
       $machine->succeed("su - alice -c 'DISPLAY=:0.0 gnome-terminal &'");
+      $machine->succeed("xauth merge ~alice/.Xauthority");
       $machine->waitForWindow(qr/Terminal/);
       $machine->mustSucceed("timeout 900 bash -c 'journalctl -f|grep -m 1 \"GNOME Shell started\"'");
       $machine->sleep(10);

nixos/tests/i3wm.nix

@@ -13,6 +13,8 @@ import ./make-test.nix ({ pkgs, ...} : {
 
   testScript = { nodes, ... }: ''
     $machine->waitForX;
+    $machine->waitForFile("/home/alice/.Xauthority");
+    $machine->succeed("xauth merge ~alice/.Xauthority");
     $machine->waitForWindow(qr/first configuration/);
     $machine->sleep(1);
     $machine->screenshot("started");

nixos/tests/kde4.nix

@@ -41,11 +41,13 @@ import ./make-test.nix ({ pkgs, ... }: {
           pkgs.kde4.kdenetwork
           pkgs.kde4.kdetoys
           pkgs.kde4.kdewebdev
+          pkgs.xorg.xmessage
         ];
     };
 
-  testScript = '' 
+  testScript = ''
       $machine->waitUntilSucceeds("pgrep plasma-desktop");
+      $machine->succeed("xauth merge ~alice/.Xauthority");
       $machine->waitForWindow(qr/plasma-desktop/);
 
       # Check that logging in has given the user ownership of devices.
@@ -62,7 +64,7 @@ import ./make-test.nix ({ pkgs, ... }: {
 
       $machine->sleep(10);
 
-      $machine->screenshot("screen"); 
+      $machine->screenshot("screen");
     '';
 
 })

nixos/tests/lightdm.nix

@@ -22,6 +22,8 @@ import ./make-test.nix ({ pkgs, ...} : {
     $machine->waitForText(qr/${user.description}/);
     $machine->screenshot("lightdm");
     $machine->sendChars("${user.password}\n");
+    $machine->waitForFile("/home/alice/.Xauthority");
+    $machine->succeed("xauth merge ~alice/.Xauthority");
     $machine->waitForWindow("^IceWM ");
   '';
 })

nixos/tests/sddm-kde5.nix

@@ -24,6 +24,8 @@ import ./make-test.nix ({ pkgs, ...} : {
 
   testScript = { nodes, ... }: ''
     startAll;
+    $machine->waitForFile("/home/alice/.Xauthority");
+    $machine->succeed("xauth merge ~alice/.Xauthority");
     $machine->waitForWindow("^IceWM ");
   '';
 })

nixos/tests/sddm.nix

@@ -23,6 +23,8 @@ import ./make-test.nix ({ pkgs, ...} : {
 
   testScript = { nodes, ... }: ''
     startAll;
+    $machine->waitForFile("/home/alice/.Xauthority");
+    $machine->succeed("xauth merge ~alice/.Xauthority");
     $machine->waitForWindow("^IceWM ");
   '';
 })

nixos/tests/xfce.nix

@@ -20,6 +20,8 @@ import ./make-test.nix ({ pkgs, ...} : {
   testScript =
     ''
       $machine->waitForX;
+      $machine->waitForFile("/home/alice/.Xauthority");
+      $machine->succeed("xauth merge ~alice/.Xauthority");
       $machine->waitForWindow(qr/xfce4-panel/);
       $machine->sleep(10);