Add nilaway linter

Author: Tomy2e

Makefile

@@ -87,6 +87,7 @@ cleanup-test-e2e: ## Tear down the Kind cluster used for e2e tests
 .PHONY: lint
 lint: golangci-lint ## Run golangci-lint linter
 	$(GOLANGCI_LINT) run
+	$(NILAWAY) -include-pkgs=github.com/scaleway/cluster-api-provider-scaleway ./...
 
 .PHONY: lint-fix
 lint-fix: golangci-lint ## Run golangci-lint linter and perform fixes
@@ -189,6 +190,7 @@ KUSTOMIZE ?= $(LOCALBIN)/kustomize
 CONTROLLER_GEN ?= $(LOCALBIN)/controller-gen
 ENVTEST ?= $(LOCALBIN)/setup-envtest
 GOLANGCI_LINT = $(LOCALBIN)/golangci-lint
+NILAWAY = $(LOCALBIN)/nilaway
 
 ## Tool Versions
 KUSTOMIZE_VERSION ?= v5.6.0
@@ -198,6 +200,7 @@ ENVTEST_VERSION ?= $(shell go list -m -f "{{ .Version }}" sigs.k8s.io/controller
 #ENVTEST_K8S_VERSION is the version of Kubernetes to use for setting up ENVTEST binaries (i.e. 1.31)
 ENVTEST_K8S_VERSION ?= $(shell go list -m -f "{{ .Version }}" k8s.io/api | awk -F'[v.]' '{printf "1.%d", $$3}')
 GOLANGCI_LINT_VERSION ?= v2.1.0
+NILAWAY_VERSION ?= latest
 
 .PHONY: kustomize
 kustomize: $(KUSTOMIZE) ## Download kustomize locally if necessary.
@@ -227,6 +230,11 @@ golangci-lint: $(GOLANGCI_LINT) ## Download golangci-lint locally if necessary.
 $(GOLANGCI_LINT): $(LOCALBIN)
 	$(call go-install-tool,$(GOLANGCI_LINT),github.com/golangci/golangci-lint/v2/cmd/golangci-lint,$(GOLANGCI_LINT_VERSION))
 
+.PHONY: nilaway
+nilaway: $(NILAWAY) ## Download nilaway locally if necessary.
+$(NILAWAY): $(LOCALBIN)
+	$(call go-install-tool,$(NILAWAY),go.uber.org/nilaway/cmd/nilaway,$(NILAWAY_VERSION))
+
 # go-install-tool will 'go install' any package with custom target and name of binary, if it doesn't exist
 # $1 - target path with name of binary
 # $2 - package url which can be installed

internal/service/scaleway/client/errors.go

@@ -18,7 +18,11 @@ var (
 // IsForbiddenError returns true if err is an HTTP 403 error.
 func IsForbiddenError(err error) bool {
 	var respError *scw.ResponseError
-	return errors.As(err, &respError) && respError.StatusCode == http.StatusForbidden
+	if !errors.As(err, &respError) {
+		return false
+	}
+
+	return respError.StatusCode == http.StatusForbidden
 }
 
 // IsNotFoundError returns true if err is an HTTP 404 error or ErrNoItemFound.

internal/service/scaleway/lb/lb.go

@@ -502,6 +502,9 @@ func (s *Service) ensureACLs(
 	}
 
 	mainLBFrontend := frontendByLB[mainLB.ID]
+	if mainLBFrontend == nil {
+		panic("did not expect mainLBFrontend to be nil")
+	}
 
 	// Set the Allowed Ranges ACL.
 	if err := s.ensureACL(ctx, mainLBFrontend, allowedRangesACLName, allowedRanges, false, aclIndex); err != nil {