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

2 files changed, 67 insertions, 0 deletions

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;
+}