buildertool: Exit orderly

The validate command does need a display connection,
for better or worse. So exit in an orderly fashion
if we don't have one, instead of crashing.

Fixes: #5948

diff --git a/tools/gtk-builder-tool-validate.c b/tools/gtk-builder-tool-validate.c
index 011b8b8d79f2b568aeb971e11cb60e10e62ad8a8..7cd0695b1939d0cdfbce3202ca8cdd98e0419307 100644 (file)
--- a/tools/gtk-builder-tool-validate.c
+++ b/tools/gtk-builder-tool-validate.c
@@ -263,6 +263,12 @@ do_validate (int *argc, const char ***argv)
   };
   int i;
 
+  if (gdk_display_get_default () == NULL)
+    {
+      g_printerr (_("Could not initialize windowing system\n"));
+      exit (1);
+    }
+
   g_set_prgname ("gtk4-builder-tool validate");
   context = g_option_context_new (NULL);
   g_option_context_set_translation_domain (context, GETTEXT_PACKAGE);