Helm template input

[starlightromero]

There are currently many projects which support Helm but not Kustomize/Kustomization. Via the CLI, a user could generate a Helm template and apply it:

helm template ./helm-kustomize --set image.tag=0.1.0 > resources.yaml
kubectl kustomize | kubectl apply -f -
rm resources.yaml

However there is no easy way to do this via Terraform. The helm_template data source outputs a manifest. This could ideally be used in Kustomization build and overlay data sources. As of right now, the overlay and build data sources take a URL, but they do not directly take Helm manifests.

[starlightromero]

For anyone looking this up later, I was able to achieve my goal with the following code:

data "helm_template" "this" {
  ...
}

data "kustomization_overlay" "this" {
  namespace = data.helm_template.this.namespace

  helm_charts {
    name          = data.helm_template.this.chart
    version       = data.helm_template.this.version
    repo          = data.helm_template.this.repository
    release_name  = data.helm_template.this.name
    include_crds  = data.helm_template.this.include_crds
    skip_tests    = data.helm_template.this.skip_tests
    values_inline = data.helm_template.this.values[0]
  }

  kustomize_options {
    enable_helm = true
    helm_path   = "helm"
  }
}

resource "kustomization_resource" "p0" {
  for_each = data.kustomization_overlay.this.ids_prio[0]
  manifest = data.kustomization_overlay.this.manifests[each.value]
}

resource "kustomization_resource" "p1" {
  for_each = data.kustomization_overlay.this.ids_prio[1]
  manifest = data.kustomization_overlay.this.manifests[each.value]

  wait = true

  depends_on = [kustomization_resource.p0]
}

resource "kustomization_resource" "p2" {
  for_each = data.kustomization_overlay.this.ids_prio[2]
  manifest = data.kustomization_overlay.this.manifests[each.value]

  depends_on = [kustomization_resource.p1]
}