core: add IS_MASTER property to NMDevice

We can't just check whether there are slaves or not, because the
master device may be started before any slaves exist, and the
slaves get added later.

src/nm-device-bond.c

@@ -496,6 +496,7 @@ nm_device_bond_new (const char *udi, const char *iface)
 	                                  NM_DEVICE_DRIVER, "bonding",
 	                                  NM_DEVICE_TYPE_DESC, "Bond",
 	                                  NM_DEVICE_DEVICE_TYPE, NM_DEVICE_TYPE_BOND,
+	                                  NM_DEVICE_IS_MASTER, TRUE,
 	                                  NULL);
 }
 

src/nm-device-bridge.c

@@ -560,6 +560,7 @@ nm_device_bridge_new (const char *udi, const char *iface)
 	                                  NM_DEVICE_DRIVER, "bridge",
 	                                  NM_DEVICE_TYPE_DESC, "Bridge",
 	                                  NM_DEVICE_DEVICE_TYPE, NM_DEVICE_TYPE_BRIDGE,
+	                                  NM_DEVICE_IS_MASTER, TRUE,
 	                                  NULL);
 }
 

src/nm-device.c

@@ -126,6 +126,7 @@ enum {
 	PROP_RFKILL_TYPE,
 	PROP_IFINDEX,
 	PROP_AVAILABLE_CONNECTIONS,
+	PROP_IS_MASTER,
 	LAST_PROP
 };
 
@@ -250,8 +251,9 @@ typedef struct {
 	NMDevice *      master;
 	gboolean        enslaved;
 
-	/* list of SlaveInfo for bond/bridge master */
-	GSList *        slaves;
+	/* slave management */
+	gboolean        is_master;
+	GSList *        slaves;    /* list of SlaveInfo */
 
 	NMConnectionProvider *con_provider;
 
@@ -1000,6 +1002,18 @@ nm_device_master_get_slaves (NMDevice *dev)
 	return slaves;
 }
 
+/**
+ * nm_device_is_master:
+ * @dev: the device
+ *
+ * Returns: whether @dev can enslave other devices (eg, bridge or bond)
+ */
+gboolean
+nm_device_is_master (NMDevice *dev)
+{
+	return NM_DEVICE_GET_PRIVATE (dev)->is_master;
+}
+
 /* release all slaves */
 static void
 nm_device_master_release_slaves (NMDevice *self, gboolean failed)
@@ -4292,6 +4306,9 @@ set_property (GObject *object, guint prop_id,
 	case PROP_RFKILL_TYPE:
 		priv->rfkill_type = g_value_get_uint (value);
 		break;
+	case PROP_IS_MASTER:
+		priv->is_master = g_value_get_boolean (value);
+		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 		break;
@@ -4414,6 +4431,9 @@ get_property (GObject *object, guint prop_id,
 			g_ptr_array_add (array, g_strdup (nm_connection_get_path (connection)));
 		g_value_take_boxed (value, array);
 		break;
+	case PROP_IS_MASTER:
+		g_value_set_boolean (value, priv->is_master);
+		break;
 	default:
 		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
 		break;
@@ -4635,6 +4655,14 @@ nm_device_class_init (NMDeviceClass *klass)
 		                     DBUS_TYPE_G_ARRAY_OF_OBJECT_PATH,
 		                     G_PARAM_READABLE));
 
+	g_object_class_install_property
+		(object_class, PROP_IS_MASTER,
+		 g_param_spec_boolean (NM_DEVICE_IS_MASTER,
+		                       "IsMaster",
+		                       "IsMaster",
+		                       FALSE,
+		                       G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY));
+
 	/* Signals */
 	signals[STATE_CHANGED] =
 		g_signal_new ("state-changed",

src/nm-device.h

@@ -60,6 +60,7 @@
 #define NM_DEVICE_TYPE_DESC        "type-desc"    /* Internal only */
 #define NM_DEVICE_RFKILL_TYPE      "rfkill-type"  /* Internal only */
 #define NM_DEVICE_IFINDEX          "ifindex"      /* Internal only */
+#define NM_DEVICE_IS_MASTER        "is-master"    /* Internal only */
 #define NM_DEVICE_AVAILABLE_CONNECTIONS "available-connections"
 
 /* Internal signals */
@@ -224,6 +225,7 @@ NMIP6Config *	nm_device_get_ip6_config	(NMDevice *dev);
 /* Master */
 gboolean        nm_device_master_add_slave  (NMDevice *dev, NMDevice *slave);
 GSList *        nm_device_master_get_slaves (NMDevice *dev);
+gboolean        nm_device_is_master         (NMDevice *dev);
 
 /* Slave */
 void            nm_device_slave_notify_enslaved (NMDevice *dev,