libnm: merge branch 'th/empty-cloned-mac-address-rh1372799'

https://bugzilla.redhat.com/show_bug.cgi?id=1372799

clients/tui/nmt-mac-entry.c

@@ -201,7 +201,8 @@ nmt_mac_entry_get_property (GObject    *object,
 		g_value_set_int (value, priv->mac_length);
 		break;
 	case PROP_MAC_ADDRESS:
-		g_value_set_string (value, nmt_newt_entry_get_text (NMT_NEWT_ENTRY (object)));
+		g_value_set_string (value,
+		                    nm_str_not_empty (nmt_newt_entry_get_text (NMT_NEWT_ENTRY (object))));
 		break;
 	case PROP_ENTRY_TYPE:
 		g_value_set_int (value, priv->entry_type);

libnm-core/nm-setting-8021x.c

@@ -2915,15 +2915,6 @@ set_cert_prop_helper (const GValue *value, const char *prop_name, GError **error
 	return bytes;
 }
 
-static char *
-_g_value_dup_string_not_empty (const GValue *value)
-{
-	const gchar *str;
-
-	str = g_value_get_string (value);
-	return str && str[0] ? g_strdup (str) : NULL;
-}
-
 static void
 set_property (GObject *object, guint prop_id,
               const GValue *value, GParamSpec *pspec)
@@ -2964,7 +2955,7 @@ set_property (GObject *object, guint prop_id,
 		break;
 	case PROP_SUBJECT_MATCH:
 		g_free (priv->subject_match);
-		priv->subject_match = _g_value_dup_string_not_empty (value);
+		priv->subject_match = nm_strdup_not_empty (g_value_get_string (value));
 		break;
 	case PROP_ALTSUBJECT_MATCHES:
 		g_slist_free_full (priv->altsubject_matches, g_free);
@@ -2972,7 +2963,7 @@ set_property (GObject *object, guint prop_id,
 		break;
 	case PROP_DOMAIN_SUFFIX_MATCH:
 		g_free (priv->domain_suffix_match);
-		priv->domain_suffix_match = _g_value_dup_string_not_empty (value);
+		priv->domain_suffix_match = nm_strdup_not_empty (g_value_get_string (value));
 		break;
 	case PROP_CLIENT_CERT:
 		if (priv->client_cert)
@@ -3018,7 +3009,7 @@ set_property (GObject *object, guint prop_id,
 		break;
 	case PROP_PHASE2_SUBJECT_MATCH:
 		g_free (priv->phase2_subject_match);
-		priv->phase2_subject_match = _g_value_dup_string_not_empty (value);
+		priv->phase2_subject_match = nm_strdup_not_empty (g_value_get_string (value));
 		break;
 	case PROP_PHASE2_ALTSUBJECT_MATCHES:
 		g_slist_free_full (priv->phase2_altsubject_matches, g_free);
@@ -3026,7 +3017,7 @@ set_property (GObject *object, guint prop_id,
 		break;
 	case PROP_PHASE2_DOMAIN_SUFFIX_MATCH:
 		g_free (priv->phase2_domain_suffix_match);
-		priv->phase2_domain_suffix_match = _g_value_dup_string_not_empty (value);
+		priv->phase2_domain_suffix_match = nm_strdup_not_empty (g_value_get_string (value));
 		break;
 	case PROP_PHASE2_CLIENT_CERT:
 		if (priv->phase2_client_cert)

libnm-core/nm-utils.c

@@ -3425,7 +3425,22 @@ _nm_utils_hwaddr_cloned_data_synth (NMSetting *setting,
 	              "cloned-mac-address",
 	              &addr,
 	              NULL);
-	return addr ? g_variant_new_string (addr) : NULL;
+
+	/* Before introducing the extended "cloned-mac-address" (and its D-Bus
+	 * field "assigned-mac-address"), libnm's _nm_utils_hwaddr_to_dbus()
+	 * would drop invalid values as it was unable to serialize them.
+	 *
+	 * Now, we would like to send invalid values as "assigned-mac-address"
+	 * over D-Bus and let the server reject them.
+	 *
+	 * However, clients used to set the cloned-mac-address property
+	 * to "" and it just worked as the value was not serialized in
+	 * an ill form.
+	 *
+	 * To preserve that behavior, seralize "" as NULL.
+	 */
+
+	return addr && addr[0] ? g_variant_new_string (addr) : NULL;
 }
 
 gboolean
@@ -3443,7 +3458,7 @@ _nm_utils_hwaddr_cloned_data_set (NMSetting *setting,
 
 	g_object_set (setting,
 	              "cloned-mac-address",
-	              g_variant_get_string (value, NULL),
+	              nm_str_not_empty (g_variant_get_string (value, NULL)),
 	              NULL);
 	return TRUE;
 }

shared/nm-utils/nm-macros-internal.h

@@ -302,6 +302,22 @@ _NM_IN_STRSET_streq (const char *x, const char *s)
 
 /*****************************************************************************/
 
+#define nm_str_not_empty(str) \
+	({ \
+		/* implemented as macro to preserve constness */ \
+		typeof (str) __str = (str); \
+		_nm_unused const char *__str_type_check = __str; \
+		((__str && __str[0]) ? __str : ((char *) NULL)); \
+	})
+
+static inline char *
+nm_strdup_not_empty (const char *str)
+{
+	return str && str[0] ? g_strdup (str) : NULL;
+}
+
+/*****************************************************************************/
+
 #define NM_PRINT_FMT_QUOTED(cond, prefix, str, suffix, str_else) \
 	(cond) ? (prefix) : "", \
 	(cond) ? (str) : (str_else), \