[mutter/wip/carlosg/x11less-preparations: 85/87] wayland: Do not set DISPLAY environment variable on self

[Carlos Garnacho <carlosg src gnome org>]

commit 436f74efd44e6688e0e2ce2e6a5563d3e7f9bd66
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Jan 31 13:07:42 2019 +0100

    wayland: Do not set DISPLAY environment variable on self
    
    Even though we want it to be visible to the rest of the session
    and used by possible X11 clients, do not set it in our own environment
    so as not to make other services we indirectly spawn (a11y most notably)
    to assume it's fine to do special X11 handling just because there is a
    DISPLAY envvar.
    
    We already transmit the environment variable to the session manager and
    through our launch contexts, no need for more.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/420

 src/wayland/meta-wayland.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/src/wayland/meta-wayland.c b/src/wayland/meta-wayland.c
index a593f0a7b..676638c10 100644
--- a/src/wayland/meta-wayland.c
+++ b/src/wayland/meta-wayland.c
@@ -263,12 +263,14 @@ meta_wayland_compositor_destroy_frame_callbacks (MetaWaylandCompositor *composit
 
 static void
 set_gnome_env (const char *name,
-              const char *value)
+              const char *value,
+              gboolean    set_env_on_self)
 {
   GDBusConnection *session_bus;
   GError *error = NULL;
 
-  setenv (name, value, TRUE);
+  if (set_env_on_self)
+    setenv (name, value, TRUE);
 
   session_bus = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
   g_assert (session_bus);
@@ -439,9 +441,9 @@ meta_wayland_init (void)
     }
 
   if (meta_should_autostart_x11_display ())
-    set_gnome_env ("DISPLAY", meta_wayland_get_xwayland_display_name (compositor));
+    set_gnome_env ("DISPLAY", meta_wayland_get_xwayland_display_name (compositor), FALSE);
 
-  set_gnome_env ("WAYLAND_DISPLAY", meta_wayland_get_wayland_display_name (compositor));
+  set_gnome_env ("WAYLAND_DISPLAY", meta_wayland_get_wayland_display_name (compositor), TRUE);
 }
 
 const char *