examples: port dbus-glib-based examples to gdbus

Port the dbus-glib-based examples to GDBus.

Also, don't use libnm in them at all; there's not much point in
examples that use the D-Bus API directly if they're just going to fall
back to libnm for the hard stuff... (And also, this avoids the problem
that GDBus uses GVariant, while the libnm-core APIs currently still
use GHashTables.)

Also fix up some comment grammar and copyright style, and add emacs
modelines where missing.

Also rename the existing GDBus-based examples to have names ending in
"-gdbus", not "-GDBus", since there's no reason to gratuitously
capitalize here.

examples/C/glib/add-connection-gdbus.c

@@ -0,0 +1,148 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*- */
+/*
+ * 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.
+ *
+ * Copyright 2011, 2014 Red Hat, Inc.
+ */
+
+/*
+ * The example shows how to call the AddConnection() D-Bus method to add a
+ * connection to the system settings service. It uses GDBus, plus a few defines
+ * from the NetworkManager headers. Contrast add-connection-libnm, which is
+ * higher level because it uses libnm.
+ *
+ * Compile with:
+ *   gcc -Wall `pkg-config --cflags libnm` `pkg-config --cflags --libs gio-2.0` -luuid add-connection-gdbus.c -o add-connection-gdbus
+ */
+
+#include <gio/gio.h>
+#include <uuid/uuid.h>
+#include <NetworkManager.h>
+
+/* copied from libnm-core/nm-utils.c */
+char *
+nm_utils_uuid_generate (void)
+{
+	uuid_t uuid;
+	char *buf;
+
+	buf = g_malloc0 (37);
+	uuid_generate_random (uuid);
+	uuid_unparse_lower (uuid, &buf[0]);
+	return buf;
+}
+
+static void
+add_connection (GDBusProxy *proxy, const char *con_name)
+{
+	GVariantBuilder connection_builder;
+	GVariantBuilder setting_builder;
+	char *uuid;
+	const char *new_con_path;
+	GVariant *ret;
+	GError *error = NULL;
+
+	/* Initialize connection GVariantBuilder */
+	g_variant_builder_init (&connection_builder, G_VARIANT_TYPE ("a{sa{sv}}"));
+
+	/* Build up the 'connection' Setting */
+	g_variant_builder_init (&setting_builder, G_VARIANT_TYPE ("a{sv}"));
+
+	uuid = nm_utils_uuid_generate ();
+	g_variant_builder_add (&setting_builder, "{sv}",
+	                       NM_SETTING_CONNECTION_UUID,
+	                       g_variant_new_string (uuid));
+	g_free (uuid);
+
+	g_variant_builder_add (&setting_builder, "{sv}",
+	                       NM_SETTING_CONNECTION_ID,
+	                       g_variant_new_string (con_name));
+	g_variant_builder_add (&setting_builder, "{sv}",
+	                       NM_SETTING_CONNECTION_TYPE,
+	                       g_variant_new_string (NM_SETTING_WIRED_SETTING_NAME));
+
+	g_variant_builder_add (&connection_builder, "{sa{sv}}",
+	                       NM_SETTING_CONNECTION_SETTING_NAME,
+	                       &setting_builder);
+
+	/* Add the (empty) 'wired' Setting */
+	g_variant_builder_init (&setting_builder, G_VARIANT_TYPE ("a{sv}"));
+	g_variant_builder_add (&connection_builder, "{sa{sv}}",
+	                       NM_SETTING_WIRED_SETTING_NAME,
+	                       &setting_builder);
+
+	/* Build up the 'ipv4' Setting */
+	g_variant_builder_init (&setting_builder, G_VARIANT_TYPE ("a{sv}"));
+	g_variant_builder_add (&setting_builder, "{sv}",
+	                       NM_SETTING_IP4_CONFIG_METHOD,
+	                       g_variant_new_string (NM_SETTING_IP4_CONFIG_METHOD_AUTO));
+	g_variant_builder_add (&connection_builder, "{sa{sv}}",
+	                       NM_SETTING_IP4_CONFIG_SETTING_NAME,
+	                       &setting_builder);
+
+	/* Call AddConnection with the connection dictionary as argument.
+	 * (g_variant_new() will consume the floating GVariant returned from
+	 * &connection_builder, and g_dbus_proxy_call_sync() will consume the
+	 * floating variant returned from g_variant_new(), so no cleanup is needed.
+	 */
+	ret = g_dbus_proxy_call_sync (proxy,
+	                              "AddConnection",
+	                              g_variant_new ("(a{sa{sv}})", &connection_builder),
+	                              G_DBUS_CALL_FLAGS_NONE, -1,
+	                              NULL, &error);
+	if (ret) {
+		g_variant_get (ret, "(&o)", &new_con_path);
+		g_print ("Added: %s\n", new_con_path);
+		g_variant_unref (ret);
+	} else {
+		g_dbus_error_strip_remote_error (error);
+		g_print ("Error adding connection: %s\n", error->message);
+		g_clear_error (&error);
+	}
+}
+
+int
+main (int argc, char *argv[])
+{
+	GDBusProxy *proxy;
+	GError *error = NULL;
+
+#if !GLIB_CHECK_VERSION (2, 35, 0)
+	/* Initialize GType system */
+	g_type_init ();
+#endif
+
+	/* Create a D-Bus proxy; NM_DBUS_* defined in nm-dbus-interface.h */
+	proxy = g_dbus_proxy_new_for_bus_sync (G_BUS_TYPE_SYSTEM,
+	                                       G_DBUS_PROXY_FLAGS_NONE,
+	                                       NULL,
+	                                       NM_DBUS_SERVICE,
+	                                       NM_DBUS_PATH_SETTINGS,
+	                                       NM_DBUS_INTERFACE_SETTINGS,
+	                                       NULL, &error);
+	if (!proxy) {
+		g_dbus_error_strip_remote_error (error);
+		g_print ("Could not create NetworkManager D-Bus proxy: %s\n", error->message);
+		g_error_free (error);
+		return 1;
+	}
+
+	/* Add a connection */
+	add_connection (proxy, "__Test connection__");
+
+	g_object_unref (proxy);
+
+	return 0;
+}