Rewrite deprecated kubernetes APIS. See https://redbubble.atlassian.net/wiki/spaces/SCAL/pages/989331583/Move+Off+Deprecated+Kubernetes+APIs

rewrite-deprecated-k8s-apis.sh

#!/usr/bin/env bash
[[ $# -eq 0 ]] && echo "Usage: $0 <kubernetes_manifest_file> ..." && exit 1

_error() {
  echo "$@" >&2
}

api_versions() {
  awk 'BEGIN {}
       ($1~/kind:/)           { kind=$2 }
       ($1~/apiVersion:/)     { api_version=$2; nr=NR }
       (kind!="" && api_version!="")  {
         print nr, kind, api_version
         kind=""; api_version=""
       }
    ' /dev/stdin
}

api_new_versions() {
  awk '($2=="Deployment") && ($3=="apps/v1beta1")        { $3="apps/v1" }
       ($2=="Deployment") && ($3=="extensions/v1beta1")  { $3="apps/v1" }
       ($2=="DaemonSet")  && ($3=="extensions/v1beta1")  { $3="apps/v1" }
       ($2=="Ingress")    && ($3=="extensions/v1beta1")  { $3="networking.k8s.io/v1beta1" }
       { print $0 }' \
     /dev/stdin
}

for file in "$@"; do
  [[ ! -f "${file}" ]] && _error "Skipping non-existent '${file}'" && continue

  new_file="$1.tmp"
  cp "${file}" "${new_file}"

  IFS=$'\n'
  for l in $(cat "${file}" | api_versions | api_new_versions); do
    nr=$(awk '{ print $1 }' <(echo "$l"))
    v=$(awk '{ print $3 }' <(echo "$l"))
    sed -i".bak" "${nr}s!:.*!: ${v}!" "${new_file}"; rm "${new_file}.bak"
  done

  diff "${new_file}" "${file}"
  mv "${new_file}" "${file}"
done