terraform-github-actions

terraform-validate action

This is one of a suite of Terraform related actions - find them at dflook/terraform-github-actions.

This action uses the terraform validate command to check that a Terraform configuration is valid. This can be used to check that a configuration is valid before creating a plan.

Failing GitHub checks will be added for any problems found.

If the Terraform configuration is not valid, the build is failed.

Inputs

• path

  Path to the Terraform root module

  • Type: string
  • Optional
  • Default: The action workspace

• workspace

  Terraform workspace to use for the terraform.workspace value while validating. Note that for remote operations in a cloud backend, this is always default.

  Also used for discovering the Terraform version to use, if not otherwise specified. See dflook/terraform-version for details.

  • Type: string
  • Optional
  • Default: default

• backend_config

  List of Terraform backend config values, one per line. This is used for discovering the Terraform version to use, if not otherwise specified. See dflook/terraform-version for details.

  with:
    backend_config: token=$
  

  • Type: string
  • Optional

• backend_config_file

  List of Terraform backend config files to use, one per line. This is used for discovering the Terraform version to use, if not otherwise specified. See dflook/terraform-version for details. Paths should be relative to the GitHub Actions workspace

  with:
    backend_config_file: prod.backend.tfvars
  

  • Type: string
  • Optional

Outputs

• failure-reason

  When the job outcome is failure because the validation failed, this will be set to ‘validate-failed’. If the job fails for any other reason this will not be set. This can be used with the Actions expression syntax to conditionally run a step when the validate fails.

Environment Variables

• GITHUB_DOT_COM_TOKEN

  This is used to specify a token for GitHub.com when the action is running on a GitHub Enterprise instance. This is only used for downloading OpenTofu binaries from GitHub.com. If this is not set, an unauthenticated request will be made to GitHub.com to download the binary, which may be rate limited.

  • Type: string
  • Optional

• TERRAFORM_CLOUD_TOKENS

  API tokens for cloud hosts, of the form <host>=<token>. Multiple tokens may be specified, one per line. These tokens may be used for fetching required modules from the registry, and discovering the Terraform version to use from a cloud workspace.

  e.g:

  env:
    TERRAFORM_CLOUD_TOKENS: app.terraform.io=$
  

  With other registries:

  env:
    TERRAFORM_CLOUD_TOKENS: |
      app.terraform.io=$
      terraform.example.com=$
  

  • Type: string
  • Optional

• TERRAFORM_SSH_KEY

  A SSH private key that Terraform will use to fetch git module sources.

  This should be in PEM format.

  For example:

  env:
    TERRAFORM_SSH_KEY: $
  

  • Type: string
  • Optional

• TERRAFORM_PRE_RUN

  A set of commands that will be run prior to terraform init. This can be used to customise the environment before running Terraform.

  The runtime environment for these actions is subject to change in minor version releases. If using this environment variable, specify the minor version of the action to use.

  The runtime image is currently based on debian:bullseye, with the command run using bash -xeo pipefail.

  For example:

  env:
    TERRAFORM_PRE_RUN: |
      # Install latest Azure CLI
      curl -skL https://aka.ms/InstallAzureCLIDeb | bash
        
      # Install postgres client
      apt-get install -y --no-install-recommends postgresql-client
  

  • Type: string
  • Optional

• TERRAFORM_HTTP_CREDENTIALS

  Credentials that will be used for fetching modules sources with git::http://, git::https://, http:// & https:// schemes.

  Credentials have the format <host>=<username>:<password>. Multiple credentials may be specified, one per line.

  Each credential is evaluated in order, and the first matching credentials are used.

  Credentials that are used by git (git::http://, git::https://) allow a path after the hostname. Paths are ignored by http:// & https:// schemes. For git module sources, a credential matches if each mentioned path segment is an exact match.

  For example:

  env:
    TERRAFORM_HTTP_CREDENTIALS: |
      example.com=dflook:$
      github.com/dflook/terraform-github-actions.git=dflook-actions:$
      github.com/dflook=dflook:$
      github.com=graham:$  
  

  • Type: string
  • Optional

Example usage

This example workflow runs on every push and fails if the Terraform configuration is invalid.

on: [push]

jobs:
  validate:
    runs-on: ubuntu-latest
    name: Validate Terraform module
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: terraform validate
        uses: dflook/terraform-validate@v1
        with:
          path: my-terraform-config

This example executes a run step only if the validation failed.

on: [push]

jobs:
  validate:
    runs-on: ubuntu-latest
    name: Validate Terraform module
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: terraform validate
        uses: dflook/terraform-validate@v1
        id: validate
        with:
          path: my-terraform-config

      - name: Validate failed
        if: $
        run: echo "terraform validate failed"