🏃 Add verification tools, linter and modules

.gitignore

@@ -19,3 +19,6 @@
 
 # Vscode files
 .vscode
+
+# Tools binaries.
+hack/tools/bin

.golangci.yml

@@ -4,6 +4,7 @@ linters:
     - misspell
     - structcheck
     - golint
+    - govet
     - deadcode
     - errcheck
     - varcheck

Makefile

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-#  Copyright 2019 The Kubernetes Authors.
+#  Copyright 2020 The Kubernetes Authors.
 #
 #  Licensed under the Apache License, Version 2.0 (the "License");
 #  you may not use this file except in compliance with the License.
@@ -14,11 +14,30 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
-#
-# Makefile with some common workflow for dev, build and test
-#
+# If you update this file, please follow
+# https://suva.sh/posts/well-documented-makefiles
+
+## --------------------------------------
+## General
+## --------------------------------------
+
+SHELL:=/usr/bin/env bash
+.DEFAULT_GOAL:=help
 
-##@ General
+# Use GOPROXY environment variable if set
+GOPROXY := $(shell go env GOPROXY)
+ifeq ($(GOPROXY),)
+GOPROXY := https://proxy.golang.org
+endif
+export GOPROXY
+
+# Active module mode, as we use go modules to manage dependencies
+export GO111MODULE=on
+
+# Tools.
+TOOLS_DIR := hack/tools
+TOOLS_BIN_DIR := $(TOOLS_DIR)/bin
+GOLANGCI_LINT := $(abspath $(TOOLS_BIN_DIR)/golangci-lint)
 
 # The help will print out all targets with their descriptions organized bellow their categories. The categories are represented by `##@` and the target descriptions by `##`.
 # The awk commands is responsible to read the entire set of makefiles included in this invocation, looking for lines of the file as xyz: ## something, and then pretty-format the target and help. Then, if there's a line with ##@ something, that gets pretty-printed as a category.
@@ -28,9 +47,52 @@
 help:  ## Display this help
 	@awk 'BEGIN {FS = ":.*##"; printf "\nUsage:\n  make \033[36m<target>\033[0m\n"} /^[a-zA-Z_0-9-]+:.*?##/ { printf "  \033[36m%-15s\033[0m %s\n", $$1, $$2 } /^##@/ { printf "\n\033[1m%s\033[0m\n", substr($$0, 5) } ' $(MAKEFILE_LIST)
 
-##@ Tests
+## --------------------------------------
+## Testing
+## --------------------------------------
 
 .PHONY: test
-test: ## Run the script check-everything.sh which will check all
-	GO111MODULE=on TRACE=1 ./hack/check-everything.sh
+test: ## Run the script check-everything.sh which will check all.
+	TRACE=1 ./hack/check-everything.sh
+
+## --------------------------------------
+## Binaries
+## --------------------------------------
+
+$(GOLANGCI_LINT): $(TOOLS_DIR)/go.mod # Build golangci-lint from tools folder.
+	cd $(TOOLS_DIR); go build -tags=tools -o bin/golangci-lint github.com/golangci/golangci-lint/cmd/golangci-lint
+
+## --------------------------------------
+## Linting
+## --------------------------------------
+
+.PHONY: lint
+lint: $(GOLANGCI_LINT) ## Lint codebase.
+	$(GOLANGCI_LINT) run -v
+
+## --------------------------------------
+## Generate
+## --------------------------------------
+
+.PHONY: modules
+modules: ## Runs go mod to ensure modules are up to date.
+	go mod tidy
+	cd $(TOOLS_DIR); go mod tidy
+
+## --------------------------------------
+## Cleanup / Verification
+## --------------------------------------
+
+.PHONY: clean
+clean: ## Cleanup.
+	$(MAKE) clean-bin
+
+.PHONY: clean-bin
+clean-bin: ## Remove all generated binaries.
+	rm -rf hack/tools/bin
 
+.PHONY: verify-modules
+verify-modules: modules
+	@if !(git diff --quiet HEAD -- go.sum go.mod); then \
+		echo "go module files are out of date"; exit 1; \
+	fi

go.mod

@@ -6,17 +6,22 @@ require (
 	github.com/evanphx/json-patch v4.5.0+incompatible
 	github.com/go-logr/logr v0.1.0
 	github.com/go-logr/zapr v0.1.0
-	github.com/golang/groupcache v0.0.0-20180513044358-24b0969c4cb7 // indirect
+	github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef // indirect
 	github.com/googleapis/gnostic v0.3.1 // indirect
 	github.com/imdario/mergo v0.3.6 // indirect
 	github.com/onsi/ginkgo v1.11.0
 	github.com/onsi/gomega v1.8.1
 	github.com/prometheus/client_golang v1.0.0
 	github.com/prometheus/client_model v0.0.0-20190129233127-fd36f4220a90
+	go.uber.org/atomic v1.4.0 // indirect
 	go.uber.org/zap v1.10.0
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 // indirect
+	golang.org/x/sys v0.0.0-20190922100055-0a153f010e69 // indirect
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
 	gomodules.xyz/jsonpatch/v2 v2.0.1
+	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/fsnotify.v1 v1.4.7
+	gopkg.in/yaml.v2 v2.2.7 // indirect
 	k8s.io/api v0.17.2
 	k8s.io/apiextensions-apiserver v0.17.2
 	k8s.io/apimachinery v0.17.2