chore: make cluster creation work with kind >= v0.6.0

The command 'kind get kubeconfig-path' has been deprecated in kind
v0.6.0 and removed in v0.7.0 so the cluster creation script doesn't
work with the newest version. To account for this fact and other
changes (such as kind now respecting `KUBECONFIG` and falling back to
the same defaults that `kubectl` uses), I reworked some parts of the
script.

This makes the scripts fail to work with kind version < v0.6.0.

scripts/create-clusters.sh

@@ -27,12 +27,11 @@ CONFIGURE_INSECURE_REGISTRY_HOST="${CONFIGURE_INSECURE_REGISTRY_HOST:-}"
 CONFIGURE_INSECURE_REGISTRY_CLUSTER="${CONFIGURE_INSECURE_REGISTRY_CLUSTER-y}"
 CONTAINER_REGISTRY_HOST="${CONTAINER_REGISTRY_HOST:-172.17.0.1:5000}"
 NUM_CLUSTERS="${NUM_CLUSTERS:-2}"
-OVERWRITE_KUBECONFIG="${OVERWRITE_KUBECONFIG:-}"
 KIND_IMAGE="${KIND_IMAGE:-}"
 KIND_TAG="${KIND_TAG:-}"
 docker_daemon_config="/etc/docker/daemon.json"
 containerd_config="/etc/containerd/config.toml"
-kubeconfig="${HOME}/.kube/config"
+
 OS=`uname`
 
 function create-insecure-registry() {
@@ -123,13 +122,6 @@ function create-clusters() {
   echo "Waiting for clusters to be ready"
   check-clusters-ready ${num_clusters}
 
-  # TODO(font): kind will create separate kubeconfig files for each cluster.
-  # Remove once https://github.com/kubernetes-sigs/kind/issues/113 is resolved.
-  if [[ "${OVERWRITE_KUBECONFIG}" ]]; then
-    kubectl config view --flatten > ${kubeconfig}
-    unset KUBECONFIG
-  fi
-
   if [[ "${CONFIGURE_INSECURE_REGISTRY_CLUSTER}" ]]; then
     # TODO(font): Configure insecure registry on kind host cluster. Remove once
     # https://github.com/kubernetes-sigs/kind/issues/110 is resolved.
@@ -141,27 +133,21 @@ function create-clusters() {
 function fixup-cluster() {
   local i=${1} # cluster num
 
-  local kubeconfig_path="$(kind get kubeconfig-path --name cluster${i})"
-  export KUBECONFIG="${KUBECONFIG:-}:${kubeconfig_path}"
-
   if [ "$OS" != "Darwin" ];then
     # Set container IP address as kube API endpoint in order for clusters to reach kube API servers in other clusters.
-    kind get kubeconfig --name "cluster${i}" --internal >${kubeconfig_path}
+    OLD_KUBECONFIG=${KUBECONFIG}
+    export KUBECONFIG=$(mktemp)
+    kind get kubeconfig --name "kind-cluster${i}" --internal > ${KUBECONFIG}
+    SERVER=$(kubectl config view -o jsonpath='{.clusters[0].cluster.server}')
+    rm ${KUBECONFIG}
+    KUBECONFIG=${OLD_KUBECONFIG}
+    kubectl config set-cluster kind-cluster${i} --server=${SERVER}
   fi
-
-  # Simplify context name
-  kubectl config rename-context "kubernetes-admin@cluster${i}" "cluster${i}"
-
-  # TODO(font): Need to rename auth user name to avoid conflicts when using
-  # multiple cluster kubeconfigs. Remove once
-  # https://github.com/kubernetes-sigs/kind/issues/112 is resolved.
-  sed -i.bak "s/kubernetes-admin/kubernetes-cluster${i}-admin/" ${kubeconfig_path} && rm -rf ${kubeconfig_path}.bak
 }
 
 function check-clusters-ready() {
   for i in $(seq ${1}); do
-    local kubeconfig_path="$(kind get kubeconfig-path --name cluster${i})"
-    util::wait-for-condition 'ok' "kubectl --kubeconfig ${kubeconfig_path} --context cluster${i} get --raw=/healthz &> /dev/null" 120
+    util::wait-for-condition 'ok' "kubectl --context kind-cluster${i} get --raw=/healthz &> /dev/null" 120
   done
 }
 
@@ -186,17 +172,3 @@ echo "Creating ${NUM_CLUSTERS} clusters"
 create-clusters ${NUM_CLUSTERS}
 
 echo "Complete"
-
-if [[ ! "${OVERWRITE_KUBECONFIG}" ]]; then
-    echo <<EOF "OVERWRITE_KUBECONFIG was not set so ${kubeconfig} was not modified. \
-You can access your clusters by setting your KUBECONFIG environment variable using:
-
-export KUBECONFIG=\"${KUBECONFIG}\"
-
-Then you can overwrite ${kubeconfig} if you prefer using:
-
-kubectl config view --flatten > ${kubeconfig}
-unset KUBECONFIG
-"
-EOF
-fi

scripts/pre-commit.sh

@@ -150,7 +150,7 @@ run-unit-tests
 echo "Downloading e2e test dependencies"
 ./scripts/download-e2e-binaries.sh
 
-CREATE_INSECURE_REGISTRY=y CONFIGURE_INSECURE_REGISTRY_HOST=y OVERWRITE_KUBECONFIG=y \
+CREATE_INSECURE_REGISTRY=y CONFIGURE_INSECURE_REGISTRY_HOST=y \
     KIND_TAG="v1.15.0" ./scripts/create-clusters.sh
 
 # Initialize list of clusters to join