ovn: make ovn probe building optional

building ovn probe has become a bit more complicated. Make it optional
so that the cost is not payed by users not wanting to use the probe

Signed-off-by: Adrian Moreno <amorenoz@redhat.com>

.mk/ovn.mk

@@ -14,14 +14,14 @@ $(GEN_BIN):
 
 .PHONY: .ovnmodel
 .ovnmodel: $(SCHEMA_FILE) $(GEN_BIN)
-# TODO: add WITH_OVN flag
-#ifeq ($(WITH_OVN), true)
-	go generate -tags "${BUILD_TAGS}" topology/probes/ovn/ovnmodel/gen.go
-#endif
+ifeq ($(WITH_OVN), true)
+	@go generate -tags "${BUILD_TAGS}" topology/probes/ovn/ovnmodel/gen.go
+endif
 
 .PHONY: .ovnmodel.clean
 .ovnmodel.clean:
-	@grep -r 'generated by ovnmetagen' $(MODEL_DIR) | cut -d: -f 1 | xargs rm -f
+ifeq ($(WITH_OVN), true)
+	@find $(MODEL_DIR) -name "*.go" | xargs grep 'generated by ovnmetagen'  | cut -d: -f 1 | xargs rm -f
 	@rm -f $(SCHEMA_FILE)
 	@rm -f $(GEN_BIN)
-
+endif

Makefile

@@ -98,8 +98,12 @@ ifeq ($(WITH_PACKETINJECT), true)
   BUILD_TAGS+=packetinject
 endif
 
+ifeq ($(WITH_OVN), true)
+  BUILD_TAGS+=ovn
+endif
+
 ifeq ($(WITH_OVNK8S), true)
-  BUILD_TAGS+=k8s ovnk8s
+  BUILD_TAGS+=k8s ovn ovnk8s
 endif
 
 

topology/probes/ovn/no_ovn.go

@@ -0,0 +1,34 @@
+// +build !ovn
+
+/*
+ * Copyright (C) 2019 Red Hat, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy ofthe License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specificlanguage governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package ovn
+
+import (
+	"github.com/skydive-project/skydive/graffiti/graph"
+	"github.com/skydive-project/skydive/probe"
+)
+
+// NewProbe returns a new OVN topology probe
+func NewProbe(g *graph.Graph, address string, certFile string, keyFile string, cacertFile string) (probe.Handler, error) {
+	return nil, probe.ErrNotImplemented
+}
+
+// Register registers graph metadata decoders
+func Register() {
+}

topology/probes/ovn/ovn.go

@@ -1,3 +1,5 @@
+// +build ovn
+
 /*
  * Copyright (C) 2019 Red Hat, Inc.
  *