Add GKE as a provider.

cluster/gke/config-common.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Copyright 2014 Google Inc. All rights reserved.
+#
+# 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.
+
+# This script should be sourced as a part of config-test or config-default.
+# Specifically, the following environment variables are assumed:
+# - CLUSTER_NAME  (the name of the cluster)
+
+MASTER_NAME="k8s-${CLUSTER_NAME}-master"
+ZONE="${ZONE:-us-central1-f}"
+NUM_MINIONS="${NUM_MINIONS:-2}"
+CLUSTER_API_VERSION="${CLUSTER_API_VERSION:-}"
+# TODO(mbforbes): Actually plumb this through; this currently only works
+#                 because we use the 'default' network by default.
+NETWORK="${NETWORK:-default}"
+GCLOUD="${GCLOUD:-gcloud}"
+GCLOUD_CONFIG_DIR="${GCLOUD_CONFIG_DIR:-${HOME}/.config/gcloud/kubernetes}"
+
+# This is a hack, but I keep setting this when I run commands manually, and
+# then things grossly fail during normal runs because cluster/kubecfg.sh and
+# cluster/kubectl.sh both use this if it's set.
+unset KUBERNETES_MASTER