Refactored kube-push.sh script

The script allows also to push binaries only to the master or specified node.
Added support for released tars.

Introduced new push methods and implemented them for GCE.

cluster/kube-push.sh

@@ -27,10 +27,61 @@ KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
 source "${KUBE_ROOT}/cluster/kube-env.sh"
 source "${KUBE_ROOT}/cluster/${KUBERNETES_PROVIDER}/util.sh"
 
-echo "Updating cluster using provider: $KUBERNETES_PROVIDER"
+function usage() {
+  echo "${0} [-m|-n <node id>] <version>"
+  echo "  Updates Kurnetes binaries. Can be done for all components (by default), master(-m) or specified node(-n)."
+  echo "  If the version is not specified will try to use local binaries."
+  echo "  Warning: upgrading single node is experimental"
+}
+
+push_to_master=false
+push_to_node=false
+
+while getopts "mn:h" opt; do
+  case ${opt} in
+    m)
+      push_to_master=true;;
+    n)
+      push_to_node=true
+      node_id="$OPTARG";;
+    h)
+      usage
+      exit 0;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      usage
+      exit 1;;
+  esac
+done
+shift $((OPTIND-1))
+
+if [[ "${push_to_master}" == "true" ]] && [[ "${push_to_node}" == "true" ]]; then
+  echo "Only one of options -m -n should be specified"
+  usage
+  exit 1
+fi
 
 verify-prereqs
-kube-push
+KUBE_VERSION=${1-}
+
+if [[ "${push_to_master}" == "false" ]] && [[ "${push_to_node}" == "false" ]]; then
+  echo "Updating cluster using provider: $KUBERNETES_PROVIDER"
+  kube-push
+fi
+
+if [[ "${push_to_master}" == "true" ]]; then
+  echo "Udating master to version ${KUBE_VERSION:-"dev"}"
+  prepare-push false
+  push-master
+fi
+
+if [[ "${push_to_node}" == "true" ]]; then
+  echo "Updating node $node_id to version ${KUBE_VERSION:-"dev"}"
+  prepare-push true
+  push-node $node_id
+fi
+
+echo "Validating cluster post-push..."
 
 "${KUBE_ROOT}/cluster/validate-cluster.sh"