File virtman-check-for-valid-display.patch of Package virt-manager.1480

Index: virt-manager-1.0.1/virt-manager
===================================================================
--- virt-manager-1.0.1.orig/virt-manager
+++ virt-manager-1.0.1/virt-manager
@@ -177,8 +177,11 @@ def main():
         from gi.repository import Gtk  # pylint: disable=E0611
         leftovers = sys.argv[1:]
 
-        # This will error if Gtk wasn't correctly initialized
-        Gtk.Window()
+        if os.environ.has_key('DISPLAY') and os.environ['DISPLAY']:
+            # This will error if Gtk wasn't correctly initialized
+            Gtk.Window()
+        else:
+            raise Exception("Error starting virt-manager: No graphical display found")
 
         globals()["Gtk"] = Gtk
         import virtManager.config