kubernetes_manifest can't handle empty map of annotations

[gwkunze]

Terraform Version, Provider Version and Kubernetes Version

Terraform version: 0.14.11
Kubernetes provider version: 2.4.1
Kubernetes version: 1.19.12

Affected Resource(s)

• kubernetes_manifest

Terraform Configuration Files

locals {
  # Labels to be used by every kubernetes resource created in this module
  commonLabels = {
    "example.com/provisionedBy" = "Terraform"
  }

  # Annotations to be used by every kubernetes resource created in this module
  commonAnnotations = {}
}

resource "kubernetes_manifest" "foobar" {
  manifest = {
    ...
    metadata = {
      ...
      labels = merge(local.commonLabels, {"my-foobar-label" = "bazban"})
      annotations = local.commonAnnotations
    }
  }
}

Error Output

Error: Provider produced inconsistent result after apply

When applying changes to
module.foobar.kubernetes_manifest.foobar, provider
"registry.terraform.io/hashicorp/kubernetes" produced an unexpected new value:
.object.metadata.annotations: was cty.MapValEmpty(cty.String), but now null.

This is a bug in the provider, which should be reported in the provider's own
issue tracker.

Steps to Reproduce

Esentially, any kubernetes_manifest where you set the annotations to {}

Expected Behavior

kubernetes_manifest should handle this like other resources, i.e. {} == no annotations

Workaround

resource "kubernetes_manifest" "foobar" {
  manifest = {
    ...
    metadata = {
      ...
      annotations = length(local.commonAnnotations) == 0 ? null : local.commonAnnotations
    }
  }
}

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[thibaut1405]

I have the same problem with kubernetes_manifest resources. When I want to create my object there is no problem. But when I replay my terraform an issue appear.

My env

• Terraform = v0.15.1
• Terragrunt = v0.29.2
• Kubernetes Provider = v2.4.1

My Object

` resource "kubernetes_manifest" "ceph-object-store" { provider = kubernetes

manifest = {
    apiVersion = "ceph.rook.io/v1"
    kind = "CephObjectStore"
    metadata = {
        name = "${var.objectstore_name}"
        namespace = "rook-ceph"
    }
    spec = {
        metadataPool = {
            failureDomain = "host"
            replicated = {
                size = "${var.replication_number}"
                requireSafeReplicaSize = true
            }
            #compressionMode = "none"
            crushRoot = ""
            erasureCoded = {
                codingChunks = 0
                dataChunks   = 0
            }
        }
        dataPool = {
            failureDomain = "host"
            replicated = {
                size = "${var.replication_number}"
                requireSafeReplicaSize = true
            }
            #compressionMode = "none"
            crushRoot = ""
            erasureCoded    = {
                codingChunks = 0
                dataChunks   = 0
            }
        }
        preservePoolsOnDelete = false
        gateway = {
            port = "80"
            instances = "${var.instances}"
            annotations = {
                "cni.projectcalico.org/ipv4pools": "[\"${format("10.%s.0/%s", var.subnet_bits, var.mask)}\"]"
            }
            labels = {
                k8s-app: "rook-ceph-rgw"
            }
            resources = {
                limits = {
                    cpu = "3"
                    memory = "2048Mi"
                }
                requests = {
                    cpu = "3"
                    memory = "2048Mi"
                }
            }
        }
        zone = {
            name = "${var.zone_name}"
        }
    }
}

} `

My issue

Error: Provider produced inconsistent result after apply
When applying changes to kubernetes_manifest.ceph-object-store, provider
"provider[\"registry.terraform.io/hashicorp/kubernetes\"]" produced an
unexpected new value: .object: wrong final value type: incorrect object
attributes.

This is a bug in the provider, which should be reported in the provider's
own issue tracker.

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