Handling unresolvable references

[Kudbettin]

Addresses #424

I am not sure if this's a bug on upstream (terraform show), a bug on terraform-compliance, or a design shortcoming.

The reference in the plan is module.ecr_repository instead of module.ecr_repository.ecr_name. (Which can't be split into three and breaks)

Let's say you had the following inside your module

output "ecr_name" {
  value = aws_ecr_repository.ecr_repository.id
}
output "not_ecr_name" {
  value = 1234
}

how can terraform-compliance know if the code wants to reference ecr_name or not_ecr_name? It needs the third part of the reference.

(Both ecr_name and not_ecr_name appear in the plan once, so we can't look for them somewhere else in the plan)

How can the missing information be added to the reference?

Until we are able to answer that, this pr addresses the issue by mounting the resource to all resources within the target module and warns the user about it.

Other Ideas

• Making the "workaround" optional with a flag. (Probably wouldn't be good)
• Just dropping unresolved references

Quick note

• In fact, module.ecr_repository.ecr_name would not be the correct reference either, since for_each names the resources differently. I wanted to describe it that way as it's somewhat less confusing.