Simplify controllers local build system (#509)

3 years ago we added a mechanism to build controllers using local module
files for both `ack-generate`, controller binaries and container images.
However, those turned out to be very complex to manage and more
importantly to maintain... the only use case we've seen over the years
is the need to build a controller using a local runtime repository...

Now that we want to start running e2e tests against runtime
repositories, we need a simplified way to build controller images using
the local runtime repository, only!

This patch removes all the never-used tooling around `go.local.mod` and
keeps `local-build-controller-image` for prow testing purposes.

Signed-off-by: Amine Hilaly <hilalyamine@gmail.com>
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

Author: a-hilaly

Dockerfile.local

@@ -29,17 +29,22 @@ ENV VERSION_PKG=github.com/aws-controllers-k8s/$service_alias-controller/pkg/ver
 # Copy the Go Modules manifests and LICENSE/ATTRIBUTION
 COPY $service_alias-controller/LICENSE $work_dir/LICENSE
 COPY $service_alias-controller/ATTRIBUTION.md $work_dir/ATTRIBUTION.md
-# use local mod files
-COPY $service_alias-controller/go.local.mod $work_dir/go.local.mod
-COPY $service_alias-controller/go.local.sum $work_dir/go.local.sum
+# Copy the go.mod and go.sum files for the service controller
 COPY $service_alias-controller/go.mod $work_dir/go.mod
+COPY $service_alias-controller/go.sum $work_dir/go.sum
 
-# for local development, copy local runtime repo
+# Copy local runtime code to the container
 COPY runtime/pkg $work_dir/../runtime/pkg
 COPY runtime/apis $work_dir/../runtime/apis
 COPY runtime/go.mod $work_dir/../runtime/go.mod
 COPY runtime/go.sum $work_dir/../runtime/go.sum
 
+# Replace the runtime module with the local runtime code
+RUN echo "replace github.com/aws-controllers-k8s/runtime => ../runtime" >> $work_dir/go.mod
+
+# TODO: Add a mechanism to inject more replacements for the go.mod file.
+# For now we don't have any real use case for this.
+
 # cache deps before building and copying source so that we don't need to re-download as much
 # and so that source changes don't invalidate our downloaded layer
 WORKDIR $work_dir/../runtime
@@ -58,7 +63,6 @@ RUN GIT_VERSION=$service_controller_git_version && \
     go build -ldflags="-X ${VERSION_PKG}.GitVersion=${GIT_VERSION} \
     -X ${VERSION_PKG}.GitCommit=${GIT_COMMIT} \
     -X ${VERSION_PKG}.BuildDate=${BUILD_DATE}" \
-    -modfile="${work_dir}/go.local.mod" \
     -a -o $work_dir/bin/controller $work_dir/cmd/controller/main.go
 
 FROM $base_image

Makefile

@@ -17,10 +17,9 @@ GO_LDFLAGS=-ldflags "-X $(IMPORT_PATH)/pkg/version.Version=$(VERSION) \
 # We need to use the codegen tag when building and testing because the
 # aws-sdk-go/private/model/api package is gated behind a build tag "codegen"...
 GO_CMD_FLAGS=-tags codegen
-GO_CMD_LOCAL_FLAGS=-modfile=go.local.mod $(GO_CMD_FLAGS)
 
-.PHONY: all local-build-ack-generate build-ack-generate local-build-controller \
-	build-controller test local-test build-controller-image \
+.PHONY: all build-ack-generate test \
+	build-controller build-controller-image \
 	local-build-controller-image lint-shell
 
 all: test
@@ -30,20 +29,13 @@ build-ack-generate:	## Build ack-generate binary
 	@go build ${GO_CMD_FLAGS} ${GO_LDFLAGS} -o bin/ack-generate cmd/ack-generate/main.go
 	@echo "ok."
 
-local-build-ack-generate:	## Build ack-generate binary using the local go.mod
-	@echo -n "building ack-generate ... "
-	@go build ${GO_CMD_LOCAL_FLAGS} ${GO_LDFLAGS} -o bin/ack-generate cmd/ack-generate/main.go
-	@echo "ok."
-
 build-controller: build-ack-generate ## Generate controller code for SERVICE
 	@./scripts/install-controller-gen.sh
 	@echo "==== building $(AWS_SERVICE)-controller ===="
 	@./scripts/build-controller.sh $(AWS_SERVICE)
 	@echo "==== building $(AWS_SERVICE)-controller release artifacts ===="
 	@./scripts/build-controller-release.sh $(AWS_SERVICE)
 
-local-build-controller: local-build-ack-generate build-controller ## Generate controller code for SERVICE using the local go.mod
-
 build-controller-image: export LOCAL_MODULES = false
 build-controller-image:	## Build container image for SERVICE
 	@./scripts/build-controller-image.sh $(AWS_SERVICE)
@@ -55,9 +47,6 @@ local-build-controller-image:	## Build container image for SERVICE allowing loca
 test: 				## Run code tests
 	go test ${GO_CMD_FLAGS} ./...
 
-local-test:			## Run code tests using the local go.mod
-	go test ${GO_CMD_LOCAL_FLAGS} ./...
-
 lint-shell:	## Run linters against all of the bash scripts
 	@find . -type f -name "*.sh" | xargs shellcheck -e SC1091