Add a bare-bones level of indirection for GCI mounter

This is the bare bones scaffolding from @vishh's PR #34787

build/lib/release.sh

@@ -320,6 +320,7 @@ function kube::release::package_kube_manifests_tarball() {
   cp "${salt_dir}/e2e-image-puller/e2e-image-puller.manifest" "${dst_dir}/"
   cp "${KUBE_ROOT}/cluster/gce/trusty/configure-helper.sh" "${dst_dir}/trusty-configure-helper.sh"
   cp "${KUBE_ROOT}/cluster/gce/gci/configure-helper.sh" "${dst_dir}/gci-configure-helper.sh"
+  cp "${KUBE_ROOT}/cluster/gce/gci/mounter" "${dst_dir}/gci-mounter"
   cp "${KUBE_ROOT}/cluster/gce/gci/health-monitor.sh" "${dst_dir}/health-monitor.sh"
   cp -r "${salt_dir}/kube-admission-controls/limit-range" "${dst_dir}"
   local objects

cluster/gce/gci/configure-helper.sh

@@ -475,6 +475,7 @@ function start-kubelet {
   flags+=" --config=/etc/kubernetes/manifests"
   flags+=" --kubelet-cgroups=/kubelet"
   flags+=" --system-cgroups=/system"
+  flags+=" --mounter-path=${KUBE_HOME}/bin/mounter"
 
   if [[ -n "${KUBELET_PORT:-}" ]]; then
     flags+=" --port=${KUBELET_PORT}"

cluster/gce/gci/configure.sh

@@ -99,7 +99,7 @@ function split-commas {
 }
 
 # Downloads kubernetes binaries and kube-system manifest tarball, unpacks them,
-# and places them into suitable directories. Files are placed in /home/kubernetes. 
+# and places them into suitable directories. Files are placed in /home/kubernetes.
 function install-kube-binary-config {
   cd "${KUBE_HOME}"
   local -r server_binary_tar_urls=( $(split-commas "${SERVER_BINARY_TAR_URL}") )
@@ -171,6 +171,7 @@ function install-kube-binary-config {
       xargs sed -ri "s@(image\":\s+\")gcr.io/google_containers@\1${kube_addon_registry}@"
   fi
   cp "${dst_dir}/kubernetes/gci-trusty/gci-configure-helper.sh" "${KUBE_HOME}/bin/configure-helper.sh"
+  cp "${dst_dir}/kubernetes/gci-trusty/gci-mounter" "${KUBE_HOME}/bin/mounter"
   cp "${dst_dir}/kubernetes/gci-trusty/health-monitor.sh" "${KUBE_HOME}/bin/health-monitor.sh"
   chmod -R 755 "${kube_bin}"
 

cluster/gce/gci/master.yaml

@@ -34,6 +34,7 @@ write_files:
       Type=oneshot
       RemainAfterExit=yes
       ExecStartPre=/bin/chmod 544 /home/kubernetes/bin/configure-helper.sh
+      ExecStartPre=/bin/chmod 544 /home/kubernetes/bin/mounter
       ExecStart=/home/kubernetes/bin/configure-helper.sh
 
       [Install]

cluster/gce/gci/mounter/mounter

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+# Copyright 2014 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.
+
+set -e
+set -o pipefail
+
+sudo /bin/mount "$@"

cluster/gce/gci/node.yaml

@@ -34,6 +34,7 @@ write_files:
       Type=oneshot
       RemainAfterExit=yes
       ExecStartPre=/bin/chmod 544 /home/kubernetes/bin/configure-helper.sh
+      ExecStartPre=/bin/chmod 544 /home/kubernetes/bin/mounter
       ExecStart=/home/kubernetes/bin/configure-helper.sh
 
       [Install]