platform: add use-udev property for NMPlatform

We want to move the multi_idx from NMLinuxPlatform to NMPlatform,
so that it can be used by NMFakePlatform as well. For that, we need
to know whether NMPlatform will use udev or not. Add a constrctor
property.

src/platform/nm-linux-platform.c

@@ -2619,8 +2619,15 @@ G_DEFINE_TYPE (NMLinuxPlatform, nm_linux_platform, NM_TYPE_PLATFORM)
 NMPlatform *
 nm_linux_platform_new (gboolean log_with_ptr, gboolean netns_support)
 {
+	gboolean use_udev = FALSE;
+
+	if (   nmp_netns_is_initial ()
+	    && access ("/sys", W_OK) == 0)
+		use_udev = TRUE;
+
 	return g_object_new (NM_TYPE_LINUX_PLATFORM,
 	                     NM_PLATFORM_LOG_WITH_PTR, log_with_ptr,
+	                     NM_PLATFORM_USE_UDEV, use_udev,
 	                     NM_PLATFORM_NETNS_SUPPORT, netns_support,
 	                     NULL);
 }
@@ -6723,12 +6730,6 @@ nm_linux_platform_init (NMLinuxPlatform *self)
 	priv->delayed_action.list_refresh_link = g_ptr_array_new ();
 	priv->delayed_action.list_wait_for_nl_response = g_array_new (FALSE, TRUE, sizeof (DelayedActionWaitForNlResponseData));
 	priv->wifi_data = g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify) wifi_utils_deinit);
-
-	if (   nmp_netns_is_initial ()
-	    && access ("/sys", W_OK) == 0) {
-		priv->udev_client = nm_udev_client_new ((const char *[]) { "net", NULL },
-		                                        handle_udev_event, self);
-	}
 }
 
 static void
@@ -6742,6 +6743,11 @@ constructed (GObject *_object)
 
 	nm_assert (!platform->_netns || platform->_netns == nmp_netns_get_current ());
 
+	if (nm_platform_get_use_udev (platform)) {
+		priv->udev_client = nm_udev_client_new ((const char *[]) { "net", NULL },
+		                                        handle_udev_event, platform);
+	}
+
 	priv->cache = nmp_cache_new (nm_platform_get_multi_idx (platform),
 	                             priv->udev_client != NULL);
 

src/platform/nm-platform.c

@@ -80,11 +80,13 @@ static guint signals[_NM_PLATFORM_SIGNAL_ID_LAST] = { 0 };
 enum {
 	PROP_0,
 	PROP_NETNS_SUPPORT,
+	PROP_USE_UDEV,
 	PROP_LOG_WITH_PTR,
 	LAST_PROP,
 };
 
 typedef struct _NMPlatformPrivate {
+	bool use_udev:1;
 	bool log_with_ptr:1;
 	NMDedupMultiIndex *multi_idx;
 } NMPlatformPrivate;
@@ -95,6 +97,12 @@ G_DEFINE_TYPE (NMPlatform, nm_platform, G_TYPE_OBJECT)
 
 /*****************************************************************************/
 
+gboolean
+nm_platform_get_use_udev (NMPlatform *self)
+{
+	return NM_PLATFORM_GET_PRIVATE (self)->use_udev;
+}
+
 gboolean
 nm_platform_get_log_with_ptr (NMPlatform *self)
 {
@@ -4929,6 +4937,10 @@ set_property (GObject *object, guint prop_id,
 				self->_netns = g_object_ref (netns);
 		}
 		break;
+	case PROP_USE_UDEV:
+		/* construct-only */
+		priv->use_udev = g_value_get_boolean (value);
+		break;
 	case PROP_LOG_WITH_PTR:
 		/* construct-only */
 		priv->log_with_ptr = g_value_get_boolean (value);
@@ -4976,6 +4988,14 @@ nm_platform_class_init (NMPlatformClass *platform_class)
 	                           G_PARAM_CONSTRUCT_ONLY |
 	                           G_PARAM_STATIC_STRINGS));
 
+	g_object_class_install_property
+	 (object_class, PROP_USE_UDEV,
+	     g_param_spec_boolean (NM_PLATFORM_USE_UDEV, "", "",
+	                           FALSE,
+	                           G_PARAM_WRITABLE |
+	                           G_PARAM_CONSTRUCT_ONLY |
+	                           G_PARAM_STATIC_STRINGS));
+
 	g_object_class_install_property
 	 (object_class, PROP_LOG_WITH_PTR,
 	     g_param_spec_boolean (NM_PLATFORM_LOG_WITH_PTR, "", "",

src/platform/nm-platform.h

@@ -45,6 +45,7 @@
 /*****************************************************************************/
 
 #define NM_PLATFORM_NETNS_SUPPORT      "netns-support"
+#define NM_PLATFORM_USE_UDEV           "use-udev"
 #define NM_PLATFORM_LOG_WITH_PTR       "log-with-ptr"
 
 /*****************************************************************************/
@@ -726,6 +727,7 @@ _nm_platform_uint8_inv (guint8 scope)
 	return (guint8) ~scope;
 }
 
+gboolean nm_platform_get_use_udev (NMPlatform *self);
 gboolean nm_platform_get_log_with_ptr (NMPlatform *self);
 
 NMPNetns *nm_platform_netns_get (NMPlatform *self);