`kubernetes_manifest` errors with `x-kubernetes-preserve-unknown-fields` CRD of ArgoCD Application

[jcogilvie]

Terraform Version, Provider Version and Kubernetes Version

Terraform version: 1.6
Kubernetes provider version: 2.24.0
Kubernetes version: 1.27

Affected Resource(s)

• kubernetes_manifest

Terraform Configuration Files

Please see https://github.com/argoproj/argo-cd/issues/16115 for config and repro case

Debug Output

Please see https://github.com/argoproj/argo-cd/issues/16115 for output

Steps to Reproduce

1. terraform apply the indicated manifest against argocd's Application CRD from v2.8+, in which it adds the x-kubernetes-preserve-unknown-fields annotation to a new field called valuesObject

Expected Behavior

It would be ideal if the provider could detect that there is not and never has been a value provided for the unknown field in my CR instance, so it can simply ignore the type change, but if it can't, then I would at least expect that the resource is deleted and recreated as indicated in https://github.com/hashicorp/terraform-provider-kubernetes/issues/1928#issuecomment-1341043424

Actual Behavior

Apply error

Important Factoids

EKS 1.27

References

• https://github.com/hashicorp/terraform-provider-kubernetes/issues/2123
• maybe https://github.com/hashicorp/terraform-provider-kubernetes/issues/1930

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[alexsomesan]

@jcogilvie Could we get a glimpse of the actual output of Terraform when the apply returns an error?

[jcogilvie]

My mistake; it errors on plan. Here's the error from a plan (which I can't presently get past to test the apply):

╷
│ Error: Failed to transform List value into Tuple of different length
│ 
│   with module.this_app[0].kubernetes_manifest.raw[0],
│   on .terraform/modules/this_app/main.tf line 172, in resource "kubernetes_manifest" "raw":
│  172: resource "kubernetes_manifest" "raw" {
│ 
│ Error: %!s(<nil>)
│ ...at attribute:
│ spec.sources
╵
╷
│ Error: Failed to transform Object element into Object element type
│ 
│   with module.this_app[0].kubernetes_manifest.raw[0],
│   on .terraform/modules/this_app/main.tf line 172, in resource "kubernetes_manifest" "raw":
│  172: resource "kubernetes_manifest" "raw" {
│ 
│ Error (see above) at attribute:
│ spec.sources
╵
╷
│ Error: Failed to transform Object element into Object element type
│ 
│   with module.this_app[0].kubernetes_manifest.raw[0],
│   on .terraform/modules/this_app/main.tf line 172, in resource "kubernetes_manifest" "raw":
│  172: resource "kubernetes_manifest" "raw" {
│ 
│ Error (see above) at attribute:
│ spec
╵

more output in gist