Makefile: improve golangci-lint installer, clean up

generate_testdata.sh,test.sh: use 'command -v', which won't print
if a binary isn't found, over 'which' to avoid unnecessary error text

Makefile

@@ -18,7 +18,6 @@
 # Makefile with some common workflow for dev, build and test
 #
 export GOPROXY?=https://proxy.golang.org/
-CONTROLLER_GEN_BIN_PATH := $(shell which controller-gen)
 
 # Get the currently used golang install path (in GOPATH/bin, unless GOBIN is set)
 ifeq (,$(shell go env GOBIN))
@@ -46,7 +45,7 @@ build: ## Build the project locally
 .PHONY: install
 install: ## Build and install the binary with the current source code. Use it to test your changes locally.
 	make build
-	cp ./bin/kubebuilder $(shell go env GOPATH)/bin/kubebuilder
+	cp ./bin/kubebuilder $(GOBIN)/kubebuilder
 
 ##@ Development
 
@@ -60,22 +59,18 @@ generate-testdata: ## Update/generate the testdata in $GOPATH/src/sigs.k8s.io/ku
 	./generate_testdata.sh
 
 .PHONY: lint
-lint: golangci-lint ## Run golangci lint checks
-	@$(GOLANGCI_LINT) run
+lint: golangci-lint ## Run golangci-lint linter
+	$(GOLANGCI_LINT) run
 
-lint-fix: golangci-lint ## Run golangci lint to automatically perform fixes
-	@$(GOLANGCI_LINT) run --fix
+lint-fix: golangci-lint ## Run golangci-lint linter and perform fixes
+	$(GOLANGCI_LINT) run --fix
 
+GOLANGCI_LINT = $(shell pwd)/bin/golangci-lint
 golangci-lint:
-ifeq (, $(shell which golangci-lint))
-	@{ \
+	@[ -f $(GOLANGCI_LINT) ] || { \
 	set -e ;\
-	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(shell go env GOPATH)/bin v1.29.0 ;\
+	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(shell dirname $(GOLANGCI_LINT)) v1.29.0 ;\
 	}
-GOLANGCI_LINT=$(shell go env GOPATH)/bin/golangci-lint
-else
-GOLANGCI_LINT=$(shell which golangci-lint)
-endif
 
 ##@ Tests
 

generate_testdata.sh

@@ -39,8 +39,8 @@ scaffold_test_project() {
     local plugin_flag="${plugin:+--plugins $plugin}"
 
     # Remove tool binaries so the correct versions are used for each plugin version.
-    rm -f "$(which controller-gen)"
-    rm -f "$(which kustomize)"
+    rm -f "$(command -v controller-gen)"
+    rm -f "$(command -v kustomize)"
 
     if [ $version == "2" ] || [ $version == "3-alpha" ]; then
         if [ $version == "2" ] && [ -n "$plugin_flag" ]; then

test.sh

@@ -92,8 +92,8 @@ EOF
 function test_project {
   local project_dir=$1
   local version=$2
-  rm -f "$(which controller-gen)"
-  rm -f "$(which kustomize)"
+  rm -f "$(command -v controller-gen)"
+  rm -f "$(command -v kustomize)"
   header_text "performing tests in dir $project_dir for project version v$version"
   cd testdata/$project_dir
   make all test