Break out dynamic salt files to enable clean kube-push.

This lets us blow away salt files and replace them with a new version while keeping a tree of "overlay" files that are cluster specific and generated at cluster up time.

Fixes #1783

cluster/gce/templates/create-dynamic-salt-files.sh

@@ -0,0 +1,27 @@
+#!/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.
+
+# Create the overlay files for the salt tree.  We create these in a separate
+# place so that we can blow away the rest of the salt configs on a kube-push and
+# re-apply these.
+
+mkdir -p /srv/salt-overlay/pillar
+cat <<EOF >/srv/salt-overlay/pillar/cluster-params.sls
+node_instance_prefix: $NODE_INSTANCE_PREFIX
+EOF
+
+mkdir -p /srv/salt-overlay/salt/nginx
+echo $MASTER_HTPASSWD > /srv/salt-overlay/salt/nginx/htpasswd

cluster/gce/util.sh

@@ -263,6 +263,7 @@ function kube-up {
     echo "readonly SERVER_BINARY_TAR_URL='${SERVER_BINARY_TAR_URL}'"
     echo "readonly SALT_TAR_URL='${SALT_TAR_URL}'"
     echo "readonly MASTER_HTPASSWD='${htpasswd}'"
+    grep -v "^#" "${KUBE_ROOT}/cluster/gce/templates/create-dynamic-salt-files.sh"
     grep -v "^#" "${KUBE_ROOT}/cluster/gce/templates/download-release.sh"
     grep -v "^#" "${KUBE_ROOT}/cluster/gce/templates/salt-master.sh"
   ) > "${KUBE_TEMP}/master-start.sh"