providerless tag for client-go auth plugins

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

hack/verify-typecheck-providerless.sh

@@ -35,3 +35,10 @@ if _out="$(go list -mod=readonly -tags "providerless" -e -json  k8s.io/kubernete
     echo "Verify typecheck for providerless tag failed. Found restricted packages." >&2
     exit 1
 fi
+if _out="$(go list -mod=readonly -tags "providerless" -e -json  k8s.io/kubernetes/cmd/kube-apiserver/... \
+  | grep -e Azure/azure-sdk-for-go -e github.com/aws/aws-sdk-go -e google.golang.org/api \
+         -e Azure/go-autorest -e oauth2/google)"; then
+    echo "${_out}" >&2
+    echo "Verify typecheck for providerless tag failed. Found restricted packages." >&2
+    exit 1
+fi

staging/src/k8s.io/client-go/plugin/pkg/client/auth/plugins.go

@@ -1,3 +1,5 @@
+// +build providerless
+
 /*
 Copyright 2016 The Kubernetes Authors.
 
@@ -17,9 +19,6 @@ limitations under the License.
 package auth
 
 import (
-	// Initialize all known client auth plugins.
+	// Initialize common client auth plugins.
-	_ "k8s.io/client-go/plugin/pkg/client/auth/azure"
-	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
 	_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
-	_ "k8s.io/client-go/plugin/pkg/client/auth/openstack"
 )

staging/src/k8s.io/client-go/plugin/pkg/client/auth/plugins_providers.go

@@ -0,0 +1,26 @@
+// +build !providerless
+
+/*
+Copyright 2016 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.
+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.
+*/
+
+package auth
+
+import (
+	// Initialize client auth plugins for cloud providers.
+	_ "k8s.io/client-go/plugin/pkg/client/auth/azure"
+	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
+	_ "k8s.io/client-go/plugin/pkg/client/auth/openstack"
+)