Add some initial validation logic.

cluster/kube-push.sh

@@ -30,4 +30,6 @@ echo "Updating cluster using provider: $KUBERNETES_PROVIDER"
 verify-prereqs
 kube-push
 
+source $(dirname $0)/validate-cluster.sh
+
 echo "Done"

cluster/kube-up.sh

@@ -31,4 +31,6 @@ echo "Starting cluster using provider: $KUBERNETES_PROVIDER"
 verify-prereqs
 kube-up
 
+source $(dirname $0)/validate-cluster.sh
+
 echo "Done"

cluster/validate-cluster.sh

@@ -0,0 +1,42 @@
+#!/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.
+
+# Bring up a Kubernetes cluster.
+#
+# If the full release name (gs://<bucket>/<release>) is passed in then we take
+# that directly.  If not then we assume we are doing development stuff and take
+# the defaults in the release config.
+
+# exit on any error
+set -e
+
+source $(dirname $0)/kube-env.sh
+source $(dirname $0)/$KUBERNETES_PROVIDER/util.sh
+
+detect-minions > /dev/null
+
+MINIONS_FILE=/tmp/minions
+$(dirname $0)/kubecfg.sh -template '{{range.Items}}{{.ID}}:{{end}}' list minions > ${MINIONS_FILE}
+
+for (( i=0; i<${#MINION_NAMES[@]}; i++)); do
+    count=$(grep -c ${MINION_NAMES[i]} ${MINIONS_FILE})
+    if [ "$count" == "0" ]; then
+	echo "Failed to find ${MINION_NAMES[i]}, cluster is probably broken."
+        exit 1
+    fi
+done
+echo "Cluster validation succeeded"
+