ingress-nginx-helm/hack/generate-deploy-scripts.sh

#!/bin/bash

# Copyright 2020 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.

if [ -n "$DEBUG" ]; then
	set -x
fi

#set -o errexit
set -o nounset
set -o pipefail

# for backwards compatibility, the default version of 1.20 is copied to the root of the variant
# with enough docs updates, this could be removed
# see     # DEFAULT VERSION HANDLING
K8S_DEFAULT_VERSION=1.20
K8S_TARGET_VERSIONS=("1.20" "1.21" "1.22" "1.23" "1.24")

DIR=$(cd $(dirname "${BASH_SOURCE}")/.. && pwd -P)

# clean
rm -rf ${DIR}/deploy/static/provider/*

TEMPLATE_DIR="${DIR}/hack/manifest-templates"

# each helm values file `values.yaml` under `hack/manifest-templates/provider` will be generated as provider/<provider>[/variant][/kube-version]/deploy.yaml
# TARGET is provider/<provider>[/variant]
TARGETS=$(dirname $(cd $DIR/hack/manifest-templates/ && find . -type f -name "values.yaml" ) | cut -d'/' -f2-)
for K8S_VERSION in "${K8S_TARGET_VERSIONS[@]}"
do
  for TARGET in ${TARGETS}
  do
    echo "Running ${K8S_VERSION} for target ${TARGET}"
    TARGET_DIR="${TEMPLATE_DIR}/${TARGET}"
    MANIFEST="${TEMPLATE_DIR}/common/manifest.yaml" # intermediate manifest
    OUTPUT_DIR="${DIR}/deploy/static/${TARGET}/${K8S_VERSION}"
    echo $OUTPUT_DIR

    mkdir -p ${OUTPUT_DIR}
    cd ${TARGET_DIR}
    helm template ingress-nginx ${DIR}/charts/ingress-nginx \
      --values values.yaml \
      --namespace ingress-nginx \
      --kube-version ${K8S_VERSION} \
      > $MANIFEST
    sed -i.bak '/app.kubernetes.io\/managed-by: Helm/d' $MANIFEST
    sed -i.bak '/helm.sh/d' $MANIFEST

    kustomize --load-restrictor=LoadRestrictionsNone build . > ${OUTPUT_DIR}/deploy.yaml
    rm $MANIFEST $MANIFEST.bak
    cd ~-
    # automatically generate the (unsupported) kustomization.yaml for each target
    sed "s_{TARGET}_${TARGET}_" $TEMPLATE_DIR/static-kustomization-template.yaml > ${OUTPUT_DIR}/kustomization.yaml

    # DEFAULT VERSION HANDLING
    if [[ ${K8S_VERSION} = ${K8S_DEFAULT_VERSION} ]]
    then
      cp ${OUTPUT_DIR}/*.yaml ${OUTPUT_DIR}/../
      sed -i.bak "s/^/#GENERATED FOR K8S ${K8S_VERSION}\n/" ${OUTPUT_DIR}/../deploy.yaml && rm ${OUTPUT_DIR}/../deploy.yaml.bak
    fi
  done
done