Add 'ETCD_DOCKER_REPOSITORY' environment variable override to 'cluster/' scripts.

This allows the etcd docker registry that is currently hard coded to
`gcr.io/google_containers/etcd` in the `etcd.manifest` template to be
overridden.  This can be used to test new versions of etcd with
kubernetes that have not yet been published to
`gcr.io/google_containers/etcd` and also enables cluster operators to
manage the etcd images used by their cluster in an internal
repository.

cluster/common.sh

@@ -828,6 +828,12 @@ EOF
     if [ -n "${ETCD_IMAGE:-}" ]; then
       cat >>$file <<EOF
 ETCD_IMAGE: $(yaml-quote ${ETCD_IMAGE})
+EOF
+    fi
+    # ETCD_DOCKER_REPOSITORY (if set) allows to use a custom etcd docker repository to pull the etcd image from.
+    if [ -n "${ETCD_DOCKER_REPOSITORY:-}" ]; then
+      cat >>$file <<EOF
+ETCD_DOCKER_REPOSITORY: $(yaml-quote ${ETCD_DOCKER_REPOSITORY})
 EOF
     fi
     # ETCD_VERSION (if set) allows you to use custom version of etcd.

cluster/gce/config-test.sh

@@ -146,6 +146,7 @@ HEAPSTER_MACHINE_TYPE="${HEAPSTER_MACHINE_TYPE:-}"
 # Set etcd image (e.g. gcr.io/google_containers/etcd) and version (e.g. 3.1.10) if you need
 # non-default version.
 ETCD_IMAGE="${TEST_ETCD_IMAGE:-}"
+ETCD_DOCKER_REPOSITORY="${TEST_ETCD_DOCKER_REPOSITORY:-}"
 ETCD_VERSION="${TEST_ETCD_VERSION:-}"
 
 # Default Log level for all components in test clusters and variables to override it in specific components.

cluster/gce/configure-vm.sh

@@ -480,6 +480,11 @@ EOF
     if [ -n "${ETCD_IMAGE:-}" ]; then
       cat <<EOF >>/srv/salt-overlay/pillar/cluster-params.sls
 etcd_docker_tag: '$(echo "$ETCD_IMAGE" | sed -e "s/'/''/g")'
+EOF
+    fi
+    if [ -n "${ETCD_DOCKER_REPOSITORY:-}" ]; then
+      cat <<EOF >>/srv/salt-overlay/pillar/cluster-params.sls
+etcd_docker_repository: '$(echo "$ETCD_DOCKER_REPOSITORY" | sed -e "s/'/''/g")'
 EOF
     fi
     if [ -n "${ETCD_VERSION:-}" ]; then

cluster/gce/container-linux/configure-helper.sh

@@ -803,6 +803,11 @@ function prepare-etcd-manifest {
   else
     sed -i -e "s@{{ *pillar\.get('etcd_docker_tag', '\(.*\)') *}}@\1@g" "${temp_file}"
   fi
+  if [[ -n "${ETCD_DOCKER_REPOSITORY:-}" ]]; then
+    sed -i -e "s@{{ *pillar\.get('etcd_docker_repository', '\(.*\)') *}}@${ETCD_DOCKER_REPOSITORY}@g" "${temp_file}"
+  else
+    sed -i -e "s@{{ *pillar\.get('etcd_docker_repository', '\(.*\)') *}}@\1@g" "${temp_file}"
+  fi
 
   sed -i -e "s@{{ *etcd_protocol *}}@$etcd_protocol@g" "${temp_file}"
   sed -i -e "s@{{ *etcd_creds *}}@$etcd_creds@g" "${temp_file}"

cluster/gce/gci/configure-helper.sh

@@ -1194,6 +1194,11 @@ function prepare-etcd-manifest {
   else
     sed -i -e "s@{{ *pillar\.get('etcd_docker_tag', '\(.*\)') *}}@\1@g" "${temp_file}"
   fi
+  if [[ -n "${ETCD_DOCKER_REPOSITORY:-}" ]]; then
+    sed -i -e "s@{{ *pillar\.get('etcd_docker_repository', '\(.*\)') *}}@${ETCD_DOCKER_REPOSITORY}@g" "${temp_file}"
+  else
+    sed -i -e "s@{{ *pillar\.get('etcd_docker_repository', '\(.*\)') *}}@\1@g" "${temp_file}"
+  fi
   sed -i -e "s@{{ *etcd_protocol *}}@$etcd_protocol@g" "${temp_file}"
   sed -i -e "s@{{ *etcd_creds *}}@$etcd_creds@g" "${temp_file}"
   if [[ -n "${ETCD_VERSION:-}" ]]; then

cluster/saltbase/salt/etcd/etcd.manifest

@@ -39,7 +39,7 @@
 "containers":[
     {
     "name": "etcd-container",
-    "image": "gcr.io/google_containers/etcd:{{ pillar.get('etcd_docker_tag', '3.1.10') }}",
+    "image": "{{ pillar.get('etcd_docker_repository', 'gcr.io/google_containers/etcd') }}:{{ pillar.get('etcd_docker_tag', '3.1.10') }}",
     "resources": {
       "requests": {
         "cpu": {{ cpulimit }}