Ansible module for retrieving Terraform state properties

Coming full circle: provision machines using Terraform and Ansible, then use the Terraform state to power your Ansible!

Installation

Download latest release from the prebuilt releases on GitHub. Rename the released binary to terraform_state and place it in ~/.ansible/plugins/modules or any other valid Ansible module directory.

Usage

The module supports two Terraform file types: terraform.tf and vars.tf. When passing the path to terraform.tf file, an existence of a properly configured backend is assumed.

Handling state using `terraform.tf`

---
- hosts: all
  become: no
  connection: local
  gather_facts: no
  tasks:
    - terraform_state:
        terraform_file_path: /path/to/my/terraform.tf
        retrieves:
         - { retrieve: o/bucket_backups }
         - { retrieve: r/aws_s3_bucket.backups/bucket_domain_name }
         - { retrieve: r/aws_s3_bucket.backups/bucket }
      register: retrieved_data
    - set_fact:
        retrieved_terraform_state_data: "{{ retrieved_data.msg | from_json }}"
    - debug:
        msg: " ==> I have got {{ retrieved_terraform_state_data.aws_s3_bucket.backups }}"

Handling variables using `vars.tf`

---
- hosts: all
  become: no
  connection: local
  gather_facts: no
  tasks:
    - terraform_state:
        terraform_file_path: /path/to/my/vars.tf
      register: retrieved_vars
    - set_fact:
        retrieved_vars_data: "{{ retrieved_vars.msg | from_json }}"
    - debug:
        msg: " ==> I have these vars {{ retrieved_vars_data }}"

The data retrieved from the vars.tf file contains only the values provided with the default property. Furthermore, the default property existence is explicit in the output. For a vars.tf file:

variable "key" {
    default = "test value"
}

the value is avialble via <retrieved_vars>.key.default.

Parameters

terraform_file_path: string, required, path to the terraform.tf or vars.tf file, no default

Following configuration settings take effect only when terraform.tf is used:

state: string, optional, state name to use, default value default
retrieves: a list of values to retrieve, at least one is required, each retrieve
- retrieve: string, required, property to retrieve; more below
- module_path: string, optional, default empty string (maps to the root path)
require_all: boolean, default false; if true, the module will fail when at least one of the values could not be found in the Terraform state

Retrieve paths

Currently, only two possible combinations can be reetrieved:

output: o/<output name>
resource: r/<resource>/<attribute>

Creating releases

To cut a release, run:

curl -sL https://raw.githubusercontent.com/radekg/git-release/master/git-release --output /tmp/git-release
chmod +x /tmp/git-release
/tmp/git-release --repository-path=$GOPATH/src/github.com/radekg/terraform-state-ansible-module
rm -rf /tmp/git-release

After the release is cut, build the binaries for the release:

git checkout v${RELEASE_VERSION}
./bin/build-release-binaries.sh

After the binaries are built, upload the to GitHub release.