Controller-gen and envtest are downloaded and used locally

* controller-gen and envtest are downloaded to a `bin` folder, local to the project, and used from there
* envtest assets are installed in a `testbin` folder, local to the project, and used from there

Signed-off-by: Cecilia Bernardi <cbernardi@expediagroup.com>

.gitignore

@@ -5,6 +5,7 @@
 *.so
 *.dylib
 bin
+testbin
 
 # Test binary, build with `go test -c`
 *.test

Makefile

@@ -18,8 +18,9 @@ BUILD_PLATFORMS ?= linux/amd64
 all: manager
 
 # Run tests
-test: generate fmt vet manifests api-docs
-	go test ./... -coverprofile cover.out
+KUBEBUILDER_ASSETS?="$(shell $(ENVTEST) use -i $(ENVTEST_KUBERNETES_VERSION) --bin-dir=$(ENVTEST_ASSETS_DIR) -p path)"
+test: generate fmt vet manifests api-docs install-envtest
+	KUBEBUILDER_ASSETS=$(KUBEBUILDER_ASSETS) go test ./... -coverprofile cover.out
 	cd api; go test ./... -coverprofile cover.out
 
 # Build manager binary
@@ -98,20 +99,10 @@ docker-push:
 	docker push ${IMG}
 
 # Find or download controller-gen
-controller-gen:
-ifeq (, $(shell which controller-gen))
-	@{ \
-	set -e ;\
-	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@v0.5.0 ;\
-	rm -rf $$CONTROLLER_GEN_TMP_DIR ;\
-	}
-CONTROLLER_GEN=$(GOBIN)/controller-gen
-else
-CONTROLLER_GEN=$(shell which controller-gen)
-endif
+CONTROLLER_GEN = $(shell pwd)/bin/controller-gen
+.PHONY: controller-gen
+controller-gen: ## Download controller-gen locally if necessary.
+	$(call go-get-tool,$(CONTROLLER_GEN),sigs.k8s.io/controller-tools/cmd/controller-gen@v0.5.0)
 
 # Find or download gen-crd-api-reference-docs
 gen-crd-api-reference-docs:
@@ -128,3 +119,28 @@ API_REF_GEN=$(GOBIN)/gen-crd-api-reference-docs
 else
 API_REF_GEN=$(shell which gen-crd-api-reference-docs)
 endif
+
+ENVTEST_ASSETS_DIR=$(shell pwd)/testbin
+ENVTEST_KUBERNETES_VERSION?=latest
+install-envtest: setup-envtest
+	mkdir -p ${ENVTEST_ASSETS_DIR}
+	$(ENVTEST) use $(ENVTEST_KUBERNETES_VERSION) --bin-dir=$(ENVTEST_ASSETS_DIR)
+
+ENVTEST = $(shell pwd)/bin/setup-envtest
+.PHONY: envtest
+setup-envtest: ## Download envtest-setup locally if necessary.
+	$(call go-get-tool,$(ENVTEST),sigs.k8s.io/controller-runtime/tools/setup-envtest@latest)
+
+# go-get-tool will 'go get' any package $2 and install it to $1.
+PROJECT_DIR := $(shell dirname $(abspath $(lastword $(MAKEFILE_LIST))))
+define go-get-tool
+@[ -f $(1) ] || { \
+set -e ;\
+TMP_DIR=$$(mktemp -d) ;\
+cd $$TMP_DIR ;\
+go mod init tmp ;\
+echo "Downloading $(2)" ;\
+GOBIN=$(PROJECT_DIR)/bin go get $(2) ;\
+rm -rf $$TMP_DIR ;\
+}
+endef