aws_launch_template tag_specifications cannot contain empty or null tags

[steved]

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Terraform Version

Terraform v0.12.24
+ provider.aws v2.60.0

Affected Resource(s)

• aws_launch_template

Terraform Configuration Files

Minimal reproduction:

resource "aws_launch_template" "test" {
  name = "test_1"

  tag_specifications {
    resource_type = "instance"
  }
}

Possibly also a related reproduction?

resource "aws_launch_template" "test" {
  name = "test_1"

  tag_specifications {
    resource_type = "instance"
    tags = {}
  }
}

Debug Output

https://gist.github.com/steved/092c6ff4ecbae5126cb3ddcf169f039c

Expected Behavior

Ideally, I think this should this fail validation? At the very least making the Tags schema required would fix the first case. I don't see a way of requiring a non-empty map, however.

Actual Behavior

InvalidRequest error without a very descriptive pointer to the incorrect statement:

aws_launch_template.test: Creating...

Error: InvalidRequest: The request received was invalid.
	status code: 400, request id: 33f7abec-980c-41a9-8503-ee960cbc65cc

  on main.tf line 9, in resource "aws_launch_template" "test":
   9: resource "aws_launch_template" "test" {

Steps to Reproduce

1. terraform apply either of the config files above.

Important Factoids

Was able to workaround this using a foreach:

locals {
  tags = {}
}

resource "aws_launch_template" "test" {
  name = "test_1"

  dynamic "tag_specifications" {
    for_each = local.tags
    content {
      resource_type = "instance"
      tags          = { (tag_specifications.key) = tag_specifications.value }
    }
  }
}

References

N/A

[ewbankkit]

Related:

• aws_launch_template Tag on create values cannot be empty #11164

[johnsonaj]

tag_specifications is an attribute specific to aws_launch_template and is not impacted by the work done to default_tags and the tags attributes