Differences between 'resource "template_file"' and 'data "template_file"'

[Matthew Thornton Long]

Hi,

I've been trying to use 'data template_file' declarations in the same way the 'resource template_file' documentation describes and I've run into a difference.  I was wondering if anyone had an explanation / workaround?

For example, with this block:

[resource|data] "template_file" "role" {

  template = "${file("${path.module}/mongodb.yml.tpl")}"

  count    = "${var.num_nodes}"

  vars {

    environment = "${var.account_name}"

    group       = "Infrastructure"

    primary     = "${lookup(var.primary_status, count.index)}"

  }

}

If this is a resource declaration (basically the "Using Templates with Count" example) then this works exactly as described (albeit with warnings):

$ terraform plan -target module.mongodb 

There are warnings and/or errors related to your configuration. Please

fix these before continuing.

Warnings:

  * template_file.role #2: using template_file as a resource is deprecated; consider using the data source instead

  * template_file.role #0: using template_file as a resource is deprecated; consider using the data source instead

  * template_file.role #1: using template_file as a resource is deprecated; consider using the data source instead

<SNIP>

If this is a "data" block then the following happens when I plan:

$ terraform plan -target module.mongodb 

There are warnings and/or errors related to your configuration. Please

fix these before continuing.

Errors:

  * data.template_file.role #0: : invalid or unknown key: count

  * data.template_file.role #1: : invalid or unknown key: count

  * data.template_file.role #2: : invalid or unknown key: count

<SNIP>

exit status 1

Is this expected?  Can we use counts with 'data template_file' elements the same way we did with resources?

Thanks,

Matt

[David Adams]

I just ran into this yesterday. If we can't use count then whole lot of use cases become broken. Same with template_cloudinit_config.

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