postrender does not have any effect in helm_template

[RemkoMolier]

Terraform, Provider, Kubernetes and Helm Versions

Terraform version: v1.9.5
Provider version: v2.15.0
Kubernetes version: N/A

Affected Resource(s)

• helm_template

Terraform Configuration Files

data "helm_template" "cilium" {
  namespace  = "kube-system"
  name       = "cilium"
  repository = "https://helm.cilium.io"
  chart      = "cilium"
  # renovate: datasource=helm depName=cilium registryUrl=https://helm.cilium.io
  version      = "1.16.0"
  kube_version = var.kubernetes_version
  api_versions = []
  values       = [file("values.yaml")]
  postrender {
    binary_path = "${path.module}/postrender"
  }
}

values.yaml:

---
ipam:
  mode: kubernetes
securityContext:
  capabilities:
    ciliumAgent: [CHOWN, KILL, NET_ADMIN, NET_RAW, IPC_LOCK, SYS_ADMIN, SYS_RESOURCE, DAC_OVERRIDE, FOWNER, SETGID, SETUID]
    cleanCiliumState: [NET_ADMIN, SYS_ADMIN, SYS_RESOURCE]
cgroup:
  autoMount:
    enabled: false
  hostRoot: /sys/fs/cgroup
k8sServiceHost: localhost
k8sServicePort: 7445
kubeProxyReplacement: true

postrender:

#!/bin/bash

yq '.metadata.annotations."meta.helm.sh/release-name"="cilium" | .metadata.annotations."meta.helm.sh/release-namespace"="kube-system" | .metadata.labels."app.kubernetes.io/managed-by" = "Helm"' <&0

Debug Output

N/A

Panic Output

N/A

Steps to Reproduce

1. terraform plan

Expected Behavior

Postrender to be executed by the helm template and the output should have been adapted

Actual Behavior

Postrender is not executed by the helm template and the output is not adapted accordingly.

Important Factoids

N/A

References

N/A

Community Note

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[arybolovlev]

Hi @RemkoMolier,

Does your post-render script work when you execute it with Helm CLI? What is the difference in output when you execute it with and without your post-render script?

Thanks.

[RemkoMolier]

Hi @arybolovlev,

yes it does. It, amongst side effects like reformatting and removal of comments , adds two annotations and one label to each of the configurations.

These are the first couple of lines from the diff (after formatting the outputs with yamlfmt):

`diff
1d0
< # Source: cilium/templates/cilium-agent/serviceaccount.yaml
6a6,10

annotations:
meta.helm.sh/release-name: cilium
meta.helm.sh/release-namespace: kube-system
labels:
app.kubernetes.io/managed-by: Helm
`

Regards,

Remko

[arybolovlev]

Hi @RemkoMolier,

Thank you! It looks like we have the postrender attribute in the helm_template data source schema, but it has not been implemented.

[RemkoMolier]

Hi @arybolovlev thank you.

Is there anything I can do to help?

Regards,

Remko