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You can configure Digger to use Conftest to check your Terraform plan output against Open Policy Agent policies.

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Pre-requisites

  • Conftest binary needs to be installed into your CI pipeline (see Conftest Docs)
  • OPA policies (rego files) under /policies directory in your repo

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Digger.yml configuration

Example assumes the terraform is in the prod directory. Don’t forget to update the json file name as well if your directory is named differently 
projects:
- name: prod
  dir: prod
  workflow: my_custom_workflow
workflows:
  my_custom_workflow:
    plan:
      steps:
      - init:
      - plan
      - run: "conftest test ./prod.json -p ../policies"
    workflow_configuration:
      on_pull_request_pushed: [digger plan]
      on_pull_request_closed: [digger unlock]
      on_commit_to_default: [digger apply]