Add make target to generate deepcopy methods

Signed-off-by: Hidde Beydals <[email protected]>

Makefile

@@ -1,6 +1,14 @@
 VER?=0.0.1
 MODULES=$(shell find . -mindepth 2 -maxdepth 4 -type f -name 'go.mod' | cut -c 3- | sed 's|/[^/]*$$||' | sort -u | tr / :)
 targets=$(addprefix test-, $(MODULES))
+root_dir=$(dir $(abspath $(lastword $(MAKEFILE_LIST))))
+
+# Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
+ifeq (,$(shell go env GOBIN))
+GOBIN=$(shell go env GOPATH)/bin
+else
+GOBIN=$(shell go env GOBIN)
+endif
 
 all:
 	$(MAKE) $(targets)
@@ -14,7 +22,10 @@ fmt-%:
 vet-%:
 	cd $(subst :,/,$*); go vet ./...
 
-test-%: tidy-% fmt-% vet-%
+generate-%: controller-gen
+	cd $(subst :,/,$*); $(CONTROLLER_GEN) object:headerFile="$(root_dir)/hack/boilerplate.go.txt" paths="./..."
+
+test-%: generate-% tidy-% fmt-% vet-%
 	cd $(subst :,/,$*); go test ./... -coverprofile cover.out
 
 release-%:
@@ -24,3 +35,19 @@ release-%:
 	git pull
 	git tag "$(REL_PATH)/v$(VER)"
 	git push origin "$(REL_PATH)/v$(VER)"
+
+# 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/[email protected] ;\
+	rm -rf $$CONTROLLER_GEN_TMP_DIR ;\
+	}
+CONTROLLER_GEN=$(GOBIN)/controller-gen
+else
+CONTROLLER_GEN=$(shell which controller-gen)
+endif

hack/boilerplate.go.txt

@@ -0,0 +1,15 @@
+/*
+Copyright 2021 The Flux authors
+
+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 of the 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 specific language governing permissions and
+limitations under the License.
+*/