build: Remove the need for docker.io creds env vars

hack/kind/create-cluster.sh

@@ -6,7 +6,7 @@
 set -euo pipefail
 IFS=$'\n\t'
 
-SCRIPT_NAME="$(basename "$0")"
+SCRIPT_NAME="$(basename "${0}")"
 readonly SCRIPT_NAME
 
 function print_usage {
@@ -22,11 +22,11 @@ EOF
 }
 
 function assert_not_empty {
-  local -r arg_name="$1"
-  local -r arg_value="$2"
+  local -r arg_name="${1}"
+  local -r arg_value="${2}"
 
-  if [[ -z $arg_value ]]; then
-    echo "The value for '$arg_name' cannot be empty"
+  if [[ -z ${arg_value} ]]; then
+    echo "The value for '${arg_name}' cannot be empty"
     print_usage
     exit 1
   fi
@@ -41,7 +41,7 @@ function run_cmd() {
   # read options
   while [[ $# -gt 0 ]]; do
     local key="$1"
-    case "$key" in
+    case "${key}" in
     --cluster-name)
       cluster_name="$2"
       shift
@@ -67,21 +67,21 @@ function run_cmd() {
   done
 
   # validate parameters
-  assert_not_empty "--cluster-name" "$cluster_name"
-  assert_not_empty "--output-dir" "$output_dir"
-  assert_not_empty "--base-config" "$base_config"
-  assert_not_empty "--kindest-image" "$kindest_image"
+  assert_not_empty "--cluster-name" "${cluster_name}"
+  assert_not_empty "--output-dir" "${output_dir}"
+  assert_not_empty "--base-config" "${base_config}"
+  assert_not_empty "--kindest-image" "${kindest_image}"
 
-  local cluster_config="$output_dir/kind-config.yaml"
+  local cluster_config="${output_dir}/kind-config.yaml"
 
   # make sure output directory exist
-  mkdir -p "$output_dir"
+  mkdir -p "${output_dir}"
 
   # create/override base config
   export KINDEST_IMAGE="${kindest_image}"
-  envsubst -no-unset <"$base_config" >"$cluster_config"
+  envsubst -i "${base_config}" -o "${cluster_config}"
 
-  kind create cluster --name "$cluster_name" --config "$cluster_config"
+  kind create cluster --name "${cluster_name}" --config "${cluster_config}"
 }
 
 run_cmd "$@"

hack/kind/kind-base-config.yaml

@@ -6,8 +6,8 @@ apiVersion: kind.x-k8s.io/v1alpha4
 containerdConfigPatches:
   - |-
     [plugins."io.containerd.grpc.v1.cri".registry.configs."registry-1.docker.io".auth]
-      username = "${DOCKER_HUB_USERNAME}"
-      password = "${DOCKER_HUB_PASSWORD}"
+      username = "${DOCKER_HUB_USERNAME:-}"
+      password = "${DOCKER_HUB_PASSWORD:-}"
   - |-
     [plugins."io.containerd.grpc.v1.cri".registry.mirrors."docker.io"]
       endpoint = ["${DOCKER_HUB_MIRROR:-https://registry-1.docker.io}"]

make/all.mk

@@ -10,7 +10,6 @@ include $(INCLUDE_DIR)repo.mk
 include $(INCLUDE_DIR)pre-commit.mk
 include $(INCLUDE_DIR)go.mk
 include $(INCLUDE_DIR)goreleaser.mk
-include $(INCLUDE_DIR)docker.mk
 include $(INCLUDE_DIR)tag.mk
 include $(INCLUDE_DIR)addons.mk
 include $(INCLUDE_DIR)kind.mk