Only use clear_config_item for lists

src/python-lxc/lxc/__init__.py

@@ -97,8 +97,12 @@ class ContainerNetwork(object):
         return self.__set_network_item(self.props[key], value)
 
     def __clear_network_item(self, key):
-        return self.container.clear_config_item("lxc.network.%s.%s" % (
-                                                self.index, key))
+        if key in ("ipv4", "ipv6"):
+            return self.container.clear_config_item("lxc.network.%s.%s" % (
+                                                    self.index, key))
+        else:
+            return self.container.set_config_item("lxc.network.%s.%s" % (
+                                                    self.index, key), "")
 
     def __get_network_item(self, key):
         return self.container.get_config_item("lxc.network.%s.%s" % (

src/tests/get_item.c

@@ -249,7 +249,7 @@ int main(int argc, char *argv[])
 		ret = 1;
 		goto out;
 	}
-	if (!c->clear_config_item(c, "lxc.network.0.ipv4.gateway")) {
+	if (!c->set_config_item(c, "lxc.network.0.ipv4.gateway", "")) {
 		fprintf(stderr, "%d: failed clearing ipv4.gateway\n", __LINE__);
 		ret = 1;
 		goto out;