[gdm/cherry-pick-2dc57da3-2] utils: add new gdm-disable-wayland binary

[Ray Strode <halfline src gnome org>]

commit 562ead49e97205ff8a09a0dc9525551a211c4cc4
Author: Ray Strode <rstrode redhat com>
Date:   Mon May 21 15:03:29 2018 +0000

    utils: add new gdm-disable-wayland binary
    
    We currently disable wayland for cirrus by calling printf
    from a udev rule.  This works, but it's a little too open
    coded to easily write SELinux policy for.
    
    This commit introduces a new program, gdm-disable-wayland,
    that does the same thing, but in a dedicated binary.
    
    A future commit will change the udev rule to use the binary.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=796315
    
    
    (cherry picked from commit 2dc57da31781dedfe374ce353b0f5fd6aa9da56f)

 utils/Makefile.am           | 14 ++++++++++++
 utils/gdm-disable-wayland.c | 53 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)
---
diff --git a/utils/Makefile.am b/utils/Makefile.am
index ae3cc01f..babe890b 100644
--- a/utils/Makefile.am
+++ b/utils/Makefile.am
@@ -10,6 +10,8 @@ AM_CPPFLAGS = \
        -DDATADIR=\"$(datadir)\"                        \
        -DGDMCONFDIR=\"$(gdmconfdir)\"                  \
        -DLOCALSTATEDIR=\""$(localstatedir)"\"          \
+       -DGDM_RUN_DIR=\"$(GDM_RUN_DIR)\"                \
+       -DGDM_RUNTIME_CONF=\"$(GDM_RUNTIME_CONF)\"      \
        -DGDM_SCREENSHOT_DIR=\""$(GDM_SCREENSHOT_DIR)"\"\
        -DGNOMELOCALEDIR=\""$(datadir)/locale"\"        \
        $(UTILS_CFLAGS)                                 \
@@ -31,6 +33,10 @@ bin_PROGRAMS = \
        gdm-screenshot          \
        $(NULL)
 
+libexec_PROGRAMS = \
+       gdm-disable-wayland     \
+       $(NULL)
+
 gdmflexiserver_LDADD =         \
        $(top_builddir)/common/libgdmcommon.la  \
        $(GTK_LIBS)             \
@@ -49,6 +55,14 @@ gdm_screenshot_LDADD =               \
        $(COMMON_LIBS)          \
        $(NULL)
 
+gdm_disable_wayland_LDADD =    \
+       $(COMMON_LIBS)          \
+       $(NULL)
+
+gdm_disable_wayland_SOURCES =  \
+       gdm-disable-wayland.c   \
+       $(NULL)
+
 CLEANFILES =                   \
        $(NULL)
 
diff --git a/utils/gdm-disable-wayland.c b/utils/gdm-disable-wayland.c
new file mode 100644
index 00000000..be61c4d8
--- /dev/null
+++ b/utils/gdm-disable-wayland.c
@@ -0,0 +1,53 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*-
+ *
+ * Copyright (C) 2018 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "config.h"
+
+#include <locale.h>
+#include <stdlib.h>
+#include <sysexits.h>
+
+#include <glib.h>
+
+int
+main (int argc, char *argv[])
+{
+        g_autoptr(GKeyFile) key_file = NULL;
+        g_autoptr(GError) error = NULL;
+        gboolean saved_okay;
+
+        setlocale (LC_ALL, "");
+
+        key_file = g_key_file_new ();
+
+        g_key_file_set_boolean (key_file, "daemon", "WaylandEnable", FALSE);
+
+        g_mkdir_with_parents (GDM_RUN_DIR, 0711);
+
+        saved_okay = g_key_file_save_to_file (key_file, GDM_RUNTIME_CONF, &error);
+
+        if (!saved_okay) {
+                g_printerr ("gdm-disable-wayland: unable to disable wayland: %s",
+                            error->message);
+                return EX_CANTCREAT;
+        }
+
+        return EX_OK;
+}