[WIP] TF Converter for Helm Release

[EronWright]

Proposed changes

This PR implements support for conversion of a Terraform helm_release resource into
a Pulumi v3.Release resource.

A mapping is defined based on the schema defined in pulumi-terraform-bridge (pkg/tfbridge/info/info.go).

Example

Given this TF program:

resource "helm_release" "example" {
  name  = "redis"
  chart = "redis"
  cleanup_on_fail = true
  atomic = true
  create_namespace = true
  dependency_update = true
  description = "A Helm chart for Kubernetes"
  devel = true
  disable_crd_hooks = true
  disable_openapi_validation = true
  disable_webhooks = true
  force_update = true
  keyring = "./keyring.gpg"
  lint = true
  max_history = 5
  pass_credentials = true
  postrender {
    binary_path = "echo"
    args = [ "foo", "bar" ]
  }
  recreate_pods = true
  render_subchart_notes = true
  replace = true
  repository = "https://charts.bitnami.com/bitnami"
  repository_ca_file = "./ca.pem"
  repository_cert_file = "./cert.pem"
  repository_key_file = "./key.pem"
  repository_password = "password"
  repository_username = "username"
  reset_values = true
  reuse_values = true
  set {
    name  = "set_1"
    value = "value1"
  }
  set_list {
    name  = "set_list_1"
    value = "value1"
  }
  set_sensitive {
    name  = "set_sensitive_1"
    value = "value1"
    type = "string"
  }
  skip_crds = true
  timeout = 60
  values  = [<<-EOT
    fullnameOverride: foo
    EOT
  ]
  version = "10.7.16"
  wait = true
  wait_for_jobs = true
}

Do conversion:

pulumi convert --from terraform --language pcl

Converting to pcl...
warning: main.pp:16,3-18: unsupported attribute 'passCredentials'; unsupported attribute 'passCredentials'
warning: main.pp:17,16-20,5: ; Cannot assign value ({ args: (string, string), binaryPath: string }) to attribute of type "Optional<string>" for resource "kubernetes:helm.sh/v3:Release"
warning: main.pp:24,3-13: unsupported attribute 'repository'; unsupported attribute 'repository'
warning: main.pp:25,3-19: unsupported attribute 'repositoryCaFile'; unsupported attribute 'repositoryCaFile'
warning: main.pp:26,3-21: unsupported attribute 'repositoryCertFile'; unsupported attribute 'repositoryCertFile'
warning: main.pp:27,3-20: unsupported attribute 'repositoryKeyFile'; unsupported attribute 'repositoryKeyFile'
warning: main.pp:28,3-21: unsupported attribute 'repositoryPassword'; unsupported attribute 'repositoryPassword'
warning: main.pp:29,3-21: unsupported attribute 'repositoryUsername'; unsupported attribute 'repositoryUsername'
warning: main.pp:32,3-6: unsupported attribute 'set'; unsupported attribute 'set'
warning: main.pp:36,3-10: unsupported attribute 'setList'; unsupported attribute 'setList'
warning: main.pp:40,3-15: unsupported attribute 'setSensitive'; unsupported attribute 'setSensitive'
warning: main.pp:47,17-44: ; Cannot assign value (string) to attribute of type "Optional<Map<pulumi:pulumi:Any>>" for resource "kubernetes:helm.sh/v3:Release"
warning: main.pp:49,3-7: unsupported attribute 'wait'; unsupported attribute 'wait'

We can see that some attributes aren't easily mapped.

Related issues (optional)

Closes #2744

[EronWright]

This task is looking to be impossible to do well, because the converter (pulumi-converter-terraform) is a bit too simplistic to convert all the properties (see above output). It supports renaming of properties but the shape of helm_release is quite different from v3.Release. I would guess that the TF converter assumes that the provider is bridged and that the schemas are highly compatible.

For this reason, my recommendation is that we close #2744 for now. Thoughts?