Syntax error interpolating count attribute when value passed between modules

[phinze]

From a report on the Terraform mailing list.

Repro config

# main.tf
module "source" {
  source = "./source"
}
module "child" {
  source  = "./child"
  list = "${module.source.list}"
}

# source/main.tf
output "list" { value = "foo,bar,baz" }

# child/main.tf
variable "list" { }
resource "template_file" "temp" {
  count     = "${length(split(",", var.list))}"
  template  = "foo"
}

Steps

Run terraform plan.

Expected behavior

A plan to create 3 templates.

Observed behavior

Error configuring: 1 error(s) occurred:

* strconv.ParseInt: parsing "${length(split(\",\", var.list))}": invalid syntax

Related issues:

• count parameter needs to be able to interpolate variables from modules. #1497
• Count parameter throws error with split interpolation function and map variable #3884
• strconv.ParseInt: parsing invalid syntax error for simple var #4738

This might actually be a dupe of one of those, but I wanted to get this repro out there. 👍

[dbrandt]

This is biting me right now. I'm trying to start up one EC2 instance in every availability zone with output from tf_aws_availability_zones but running into this parse error instead, forcing me to use hard coded values.

[ghost]

Any update on this?

Thanks!

[clstokes]

Related to #4703 too maybe?

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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