AWS CLI Resource Terraform Module

This module is used to create a AWS resource in terraform by calling out to the CLI, with support for cross account resource creation (see example). The module encapsulates the act of assuming a role, when required to create the resource in the specified account.

This was originally forked from https://github.com/opetch/terraform-aws-cli-resource and after forking first used to retag an ecr image.

Use Cases

Situations where it's not possible to create resources in the desired configuration due to cross account permissions. (see example)
When terraform does not yet have support for a resource and resorting to CLI is a necessary compromise

Prerequisites

Must be using sts assume role as a means to authenticate (where a role is supplied).
The credentials terraform is using to run must resolve to a identity with permissions allowing assuming of the roles the module is configured to use (where a role is supplied).
cksum, grep, awk must be available (as they are on most systems)

Example Usage

This module was created initially to combat the issue with the aws provider for terraform where it is not possible to associate a route53 zone to a VPC in a different account Issue 617 (aws-provider) and Issue 12465 for more details.

Use of the CLI circumvents the bug mentioned above and the inclusion of the sts assume role support alleviates some of the pain caused by Issue 3 (null provider)

module "foobar" {
  source          = "github.com/opetch/terraform-aws-cli-resource"

  role_arn        = "[role arn]"
  cmd             = "aws ?"

  # Require that the above resource is created first 
  dependency_ids  = ["${module.create_vpc_association_authorization.id}"] 
}

Terraform version

Terraform version 0.12.21 has been used when creating the module, however many previous versions should work also but have not been tested.

ikudjoi/terraform-aws-cli-resource

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