From 800fcfd8801d2fdc3996b0983bb6a826d7475d80 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Sun, 30 Oct 2016 01:31:53 +0200
Subject: [PATCH] Do not start guid if DISPLAY is not set

Fixes QubesOS/qubes-issues#2408
---
 core-modules/000QubesVm.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core-modules/000QubesVm.py b/core-modules/000QubesVm.py
index e8d9b6ce..8e9978a8 100644
--- a/core-modules/000QubesVm.py
+++ b/core-modules/000QubesVm.py
@@ -2017,6 +2017,11 @@ class QubesVm(object):
             # preparing DispVM, where it isn't needed because of "invisible"
             # mode
             start_guid = False
+        if start_guid and 'DISPLAY' not in os.environ:
+            if verbose:
+                print >> sys.stderr, \
+                    "WARNING: not starting GUI, because DISPLAY not set"
+            start_guid = False
 
         if start_guid:
             self.start_guid(verbose=verbose, notify_function=notify_function,