What's correct use extra_config in vsphere_virtual_machine?

Hi guys,

I’m trying to use the cloud-init to provision VMs with terraform in vmware.

My code:

resource "vsphere_virtual_machine" "vm1" {
  name                 = "vm1"
  resource_pool_id     = "${data.vsphere_compute_cluster.cluster.resource_pool_id}"
...
clone {
    template_uuid = "${data.vsphere_virtual_machine.template.id}"
  }

  extra_config {
    "guestinfo.userdata"          = "${data.template_cloudinit_config.cloud-config.rendered}"
    "guestinfo.userdata.encoding" = "gzip+base64"
    "guestinfo.metadata"          = <<-EOT
       { "local-hostname": "vm1.dfcddom0001" }
    EOT
  }

When execute the command terraform validade I receive the error message.

Message error:

Error: Invalid argument name

  on vm1.tf line 50, in resource "vsphere_virtual_machine" "vm1":
  50:     "guestinfo.userdata"          = "${data.template_cloudinit_config.cloud-config.rendered}"

Argument names must not be quoted.

I think this is a problem with extra_config. I trying to use this, but not work whit me https://floating.io/2019/04/iaas-terraform-and-vsphere/

It’s work with me:

extra_config = {
    "guestinfo.userdata"          = "${data.template_cloudinit_config.cloud-config.rendered}"
    "guestinfo.userdata.encoding" = "gzip+base64"
    "guestinfo.metadata"          = <<-EOT
       { "local-hostname": "vm1.dfcddom0001" }
    EOT
  }

terraform version

$ terraform version
Terraform v0.12.12
+ provider.template v2.1.2
+ provider.vsphere v1.13.0