kustomize from istio helm chart + gke ingress health checks

ingressgateway_probes.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: istio-ingressgateway
spec:
  template:
    spec:
      containers:
      - name: istio-proxy
        readinessProbe:
          httpGet:
            path: /_healthz
            port: 443
            scheme: HTTPS

istio.yaml

apiVersion: embark-studios.com/v1
kind: Istio
metadata:
  name: istio
istio:
  version: "1.3.0"
  helm_values: values.yaml

kustomization.yaml

generators:
- istio.yaml

resources:
- health-check-filter.yaml

patches:
- ingressgateway_probes.yaml

kustomize__plugin__embark-studios.com__v1__stio__Istio.sh

#!/bin/bash
set -ex

function _config() {
  yaml2json < istio.yaml | jq -r "$@"
}

istio_version="$(_config .istio.version)"
values="$(_config '.istio.helm_values // "values.yaml" ')"

tmp=$(mktemp -d -t istio.XXXXX)
trap "{ rm -rf $tmp; }" EXIT

archive=/tmp/istio-${istio_version}-linux.tar.gz

if [[ ! -f $archive ]]; then
  curl -fsL -o $archive https://github.com/istio/istio/releases/download/${istio_version}/istio-${istio_version}-linux.tar.gz
fi

tar -C $tmp -xzf $archive

helm_dir="$tmp/istio-${istio_version}/install/kubernetes/helm"
helm template --namespace istio-system -f $values --name istio-init $helm_dir/istio-init
helm template --namespace istio-system -f $values --name istio $helm_dir/istio