Update controller-gen handling in Makefile

Makefile

@@ -10,6 +10,7 @@ IMG ?= $(IMAGE_REPOSITORY):$(IMAGE_TAG)
 
 # Produce CRDs that work back to Kubernetes 1.11 (no version conversion)
 CRD_OPTIONS ?= "crd:trivialVersions=true"
+CONTROLLER_GEN_REQVERSION := v0.6.2
 
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
 ifeq (,$(shell go env GOBIN))
@@ -107,7 +108,17 @@ ifeq (, $(shell which controller-gen))
 	CONTROLLER_GEN_TMP_DIR=$$(mktemp -d) ;\
 	cd $$CONTROLLER_GEN_TMP_DIR ;\
 	go mod init tmp ;\
-	go get sigs.k8s.io/controller-tools/cmd/controller-gen@v0.2.5 ;\
+	go install sigs.k8s.io/controller-tools/cmd/controller-gen@$(CONTROLLER_GEN_REQVERSION) ;\
+	rm -rf $$CONTROLLER_GEN_TMP_DIR ;\
+	}
+CONTROLLER_GEN=$(GOBIN)/controller-gen
+else ifneq (Version: $(CONTROLLER_GEN_REQVERSION), $(shell controller-gen --version))
+	@{ \
+	set -e ;\
+	CONTROLLER_GEN_TMP_DIR=$$(mktemp -d) ;\
+	cd $$CONTROLLER_GEN_TMP_DIR ;\
+	go mod init tmp ;\
+	go install sigs.k8s.io/controller-tools/cmd/controller-gen@$(CONTROLLER_GEN_REQVERSION) ;\
 	rm -rf $$CONTROLLER_GEN_TMP_DIR ;\
 	}
 CONTROLLER_GEN=$(GOBIN)/controller-gen