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Setup OPA GitHub Action

GitHub action to configure the Open Policy Agent CLI in your GitHub Actions workflow.

Open Policy Agent (OPA) is an open source, general-purpose policy engine.

Running tests

This GitHub Action works great to run any tests you have included with your Rego files.

Basic Usage

Here we see a simple template that checks out the repository code, installs the latest OPA, and then runs all of the Rego files in the tests directory.

name: Run OPA Tests
on: [push]
jobs:
  Run-OPA-Tests:
    runs-on: ubuntu-latest
    steps:
    - name: Check out repository code
      uses: actions/checkout@v3

    - name: Setup OPA
      uses: open-policy-agent/setup-opa@v2
      with:
        version: latest

    - name: Run OPA Tests
      run: opa test tests/*.rego -v

Choose OPA Version

When OPA is installed on the GitHub runner, you can select a the specific version of OPA you wish to run.

steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: 0.44.0

Or, OPA can be locked to a SemVer range.

steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: 0.44.x

steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: 0.44

steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: <0.44

You may also use the latest or edge version.

steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: latest

steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: edge

You can also choose to run your tests against multiple versions of OPA.

strategy:
  matrix:
    version: [latest, 0.44.x, 0.43.x]
steps:
  - name: Setup OPA
    uses: open-policy-agent/setup-opa@v2
    with:
      version: ${{ matrix.version }}

Inputs

The action supports the following inputs:

• version: Optional, defaults to latest. latest, edge, and SemVer ranges are supported, so instead of a full version string, you can use 0.44. This enables you to automatically get the latest backward compatible changes in the v0.44 release.

Outputs

This action does not set any direct outputs.

Troubleshooting

Within GitHub Actions, using Terraform plans as input results in ["command"]

Sometimes, when trying to analyze a JSON-formatted Terraform plan with opa, the input is always bound to ["command"] regardless of the contents of the plan. This issue is specific to GitHub Actions, and is related to the terraform_wrapper functionality that is enabled by default in the official hashicorp/setup-terraform action. Specifically, the terraform_wrapper includes extra metadata when running commands such as terraform show -json tfplan > tfplan.json.

There are two primary options for resolving this issue:

• EITHER disable the terraform_wrapper when using hashicorp/setup-terraform

  - uses: hashicorp/setup-terraform@{{REF}}
    with:
      terraform_wrapper: false
  

• OR manually "filter" the extra metadata when creating the JSON-formatted plan:

  - run: terraform show -json tfplan | grep '^{.*}$' > tfplan.json
  

For a more thorough description of why this happens, see this issue.

Credits

Thanks to the folks over at Infracost who created the initial version of this repository.

Contributions

Contributions are welcome! See Contributor's Guide

Code of Conduct

👋 Be nice. See our code of conduct