Makefile: install kustomize if not installed (#22)

Author: camilamacedo86

example/Makefile

@@ -4,27 +4,34 @@ IMG ?= quay.io/joelanford/nginx-operator
 
 all: docker-build
 
+# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
+ifeq (,$(shell go env GOBIN))
+GOBIN=$(shell go env GOPATH)/bin
+else
+GOBIN=$(shell go env GOBIN)
+endif
+
 # Run against the configured Kubernetes cluster in ~/.kube/config
 run:
 	go run ../main.go
 
 # Install CRDs into a cluster
-install:
-	kustomize build config/crd | kubectl apply -f -
+install: kustomize
+	$(KUSTOMIZE) build config/crd | kubectl apply -f -
 
 # Uninstall CRDs from a cluster
-uninstall:
-	kustomize build config/crd | kubectl delete -f -
+uninstall: kustomize
+	$(KUSTOMIZE) build config/crd | kubectl delete -f -
 
 # Deploy controller in the configured Kubernetes cluster in ~/.kube/config
-deploy:
-	cd config/manager && kustomize edit set image controller=${IMG}
-	kustomize build config/default | kubectl apply -f -
+deploy: kustomize
+	cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}
+	$(KUSTOMIZE) build config/default | kubectl apply -f -
 
 # Undeploy controller in the configured Kubernetes cluster in ~/.kube/config
-undeploy:
-	cd config/manager && kustomize edit set image controller=${IMG}
-	kustomize build config/default | kubectl delete -f -
+undeploy: kustomize
+	cd config/manager && $(KUSTOMIZE) edit set image controller=${IMG}
+	$(KUSTOMIZE) build config/default | kubectl delete -f -
 
 # Build the docker image
 docker-build:
@@ -33,3 +40,18 @@ docker-build:
 # Push the docker image
 docker-push:
 	docker push ${IMG}
+
+kustomize:
+ifeq (, $(shell which kustomize))
+	@{ \
+	set -e ;\
+	KUSTOMIZE_GEN_TMP_DIR=$$(mktemp -d) ;\
+	cd $$KUSTOMIZE_GEN_TMP_DIR ;\
+	go mod init tmp ;\
+	go get sigs.k8s.io/kustomize/kustomize/[email protected] ;\
+	rm -rf $$KUSTOMIZE_GEN_TMP_DIR ;\
+	}
+KUSTOMIZE=$(GOBIN)/kustomize
+else
+KUSTOMIZE=$(shell which kustomize)
+endif