Can't destroy using modules on 0.7rc01

[dbcoliveira]

Hi there,

I am currently using terraform 0.7rc01 and I can't destroy something that have been applied using modules (docker provider) just seconds before.

A snippet of the module source goes like:

variable docker_host {}
variable container_name {}
variable servers {}
variable arguments {}

provider "docker" {
    host = "tcp://${var.docker_host}:2375/"
}
.
.
.

A snippet of the module goes as:

variable "ipaddress" {
        default = "10.64.78.75,10.64.78.76,10.64.78.77"
}

module "etcd01" {
  source = "module/etcd/"
  docker_host = "${element(split(",",var.ipaddress),0)}"
  container_name = "${var.cname}"
  servers = "${var.servers}"
  arguments = ""
}
.
.
.

So applying with:

terraform apply -target=module.etcd01 -target=module.etcd02 -target=module.etcd03 -var-file=secret.tfvars

module.etcd02.docker_container.etcd-viewer: Creation complete
module.etcd03.docker_container.etcd-viewer: Creation complete

Apply complete! Resources: 9 added, 0 changed, 0 destroyed.

Everything goes well and confirmed that it really applies.
On the destroy part it fails big:

terraform destroy -target=module.etcd01 -target=module.etcd02 -target=module.etcd03 -var-file=secret.tfvars

Do you really want to destroy?
  Terraform will delete the following infrastructure:
    module.etcd01
    module.etcd02
    module.etcd03
  There is no undo. Only 'yes' will be accepted to confirm

  Enter a value: yes

.........
Error applying plan:

3 error(s) occurred:

* 1:9: unknown variable accessed: var.docker_host in:

tcp://${var.docker_host}:2375/
* 1:9: unknown variable accessed: var.docker_host in:

tcp://${var.docker_host}:2375/
* 1:9: unknown variable accessed: var.docker_host in:

tcp://${var.docker_host}:2375/

Note that I know the variable list declaration implementation was introduced on 0.7 so I've actually try to perform the same code without the ipaddress list but using the actual ips. the result is the same.

Any ideas ?

Thank you for the feedback

[phinze]

Hi @dbcoliveira - thanks for the report, and sorry for the trouble!

Here is a full repro config that I have confirmed works in 0.6.16 and does not work on 0.7.0-rc1 or master:

Config

# main.tf
module "foo" {
  source = "./foo"
  in = "1"
}

# foo/foo.tf
variable "in" { }

provider "aws" {
  region = "us-east-${var.in}"
}

resource "aws_security_group" "bar" { }

Steps

terraform apply
terraform destroy -force

Expected

Happy destroy

Got

Error applying plan:

1 error(s) occurred:

* 1:11: unknown variable accessed: var.in in:

us-east-${var.in}

[phinze]

Just confirmed the list is not required - simplifying the example above to reflect that.

[phinze]

cc @jen20 FYI - planning on digging into this later but in case you get to it first. 👍

[phinze]

Fixed in #7131 👍

[ghost]

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