This Github Action is used to run Terraform plan for a single, Atmos-supported component and save the given planfile to S3 and DynamoDB.

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This Github Action is used to run Terraform plan for a single, Atmos-supported component and save the given planfile to S3 and DynamoDB.

After running this action, apply Terraform with the companion action, github-action-atmos-terraform-apply

This GitHub Action requires AWS access for two different purposes. This action will attempt to first run terraform plan against a given component and then will use another role to save that given Terraform Plan to an S3 Bucket with metadata in a DynamoDB table. We recommend configuring OpenID Connect with AWS to allow GitHub to assume roles in AWS and then deploying both a Terraform Plan role and a Terraform State role. For Cloud Posse documentation on setting up GitHub OIDC, see our github-oidc-provider component.

In order to store Terraform State, we configure an S3 Bucket to store plan files and a DynamoDB table to track plan metadata. Both will need to be deployed before running this action. For more on setting up those components, see the gitops component (documentation pending). This action will then use the github-action-terraform-plan-storage action to update these resources.

The action expects the atmos configuration file atmos.yaml to be present in the repository. The config should have the following structure:

integrations:
  github:
    gitops:
      opentofu-version: 1.7.3
      terraform-version: 1.5.2
      infracost-enabled: false
      artifact-storage:
        region: us-east-2
        bucket: cptest-core-ue2-auto-gitops
        table: cptest-core-ue2-auto-gitops-plan-storage
        role: arn:aws:iam::xxxxxxxxxxxx:role/cptest-core-ue2-auto-gitops-gha
      role:
        plan: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
        apply: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
      matrix:
        sort-by: .stack_slug
        group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")

This action supports OpenTofu.

To enable OpenTofu add the following settings to atmos.yaml

• Set the opentofu-version in the atmos.yaml to the desired version
• Set components.terraform.command to tofu

components:
  terraform:
    command: tofu

...

integrations:
  github:
    gitops:
      opentofu-version: 1.7.3
      ...

  name: "atmos-terraform-plan"

  on:
    workflow_dispatch: {}
    pull_request:
      types:
        - opened
        - synchronize
        - reopened
      branches:
        - main

  # These permissions are required for GitHub to assume roles in AWS
  permissions:
    id-token: write
    contents: read

  jobs:
    plan:
      runs-on: ubuntu-latest
      steps:
        - name: Plan Atmos Component
          uses: cloudposse/github-action-atmos-terraform-plan@v2
          with:
            component: "foobar"
            stack: "plat-ue2-sandbox"
            atmos-config-path: ./rootfs/usr/local/etc/atmos/
            atmos-version: 1.81.0

The notable changes in v2 are:

• v2 works only with atmos >= 1.63.0
• v2 drops install-terraform input because terraform is not required for affected stacks call
• v2 drops atmos-gitops-config-path input and the ./.github/config/atmos-gitops.yaml config file. Now you have to use GitHub Actions environment variables to specify the location of the atmos.yaml.

The following configuration fields now moved to GitHub action inputs with the same names

The following configuration fields moved to the atmos.yaml configuration file.

For example, to migrate from v1 to v2, you should have something similar to the following in your atmos.yaml:

./.github/config/atmos.yaml

# ... your existing configuration

integrations:
  github:
    gitops:
      terraform-version: 1.5.2
      infracost-enabled: false
      artifact-storage:
        region: us-east-2
        bucket: cptest-core-ue2-auto-gitops
        table: cptest-core-ue2-auto-gitops-plan-storage
        role: arn:aws:iam::xxxxxxxxxxxx:role/cptest-core-ue2-auto-gitops-gha
      role:
        plan: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
        apply: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
      matrix:
        sort-by: .stack_slug
        group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")

.github/workflows/main.yaml

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v2
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      atmos-config-path: ./rootfs/usr/local/etc/atmos/
      atmos-version: 1.63.0

This corresponds to the v1 configuration (deprecated) below.

The v1 configuration file ./.github/config/atmos-gitops.yaml looked like this:

atmos-version: 1.45.3
atmos-config-path: ./rootfs/usr/local/etc/atmos/
terraform-state-bucket: cptest-core-ue2-auto-gitops
terraform-state-table: cptest-core-ue2-auto-gitops
terraform-state-role: arn:aws:iam::xxxxxxxxxxxx:role/cptest-core-ue2-auto-gitops-gha
terraform-plan-role: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
terraform-apply-role: arn:aws:iam::yyyyyyyyyyyy:role/cptest-core-gbl-identity-gitops
terraform-version: 1.5.2
aws-region: us-east-2
enable-infracost: false
sort-by: .stack_slug
group-by: .stack_slug | split("-") | [.[0], .[2]] | join("-")  

And the v1 GitHub Action Workflow looked like this.

.github/workflows/main.yaml

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v1
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml

1. v2 drops the component-path variable and instead fetches if directly from the atmos.yaml file automatically. Simply remove the component-path argument from your invocations of the cloudposse/github-action-atmos-terraform-plan action.
2. v2 moves most of the inputs to the Atmos GitOps config path ./.github/config/atmos-gitops.yaml. Simply create this file, transfer your settings to it, then remove the corresponding arguments from your invocations of the cloudposse/github-action-atmos-terraform-plan action. | name | |--------------------------| | atmos-version | | atmos-config-path | | terraform-state-bucket | | terraform-state-table | | terraform-state-role | | terraform-plan-role | | terraform-apply-role | | terraform-version | | aws-region | | enable-infracost |

If you want the same behavior in v2 as in v1 you should create config ./.github/config/atmos-gitops.yaml with the same variables as in v1 inputs.

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v1
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml

Which would produce the same behavior as in v1, doing this:

  - name: Plan Atmos Component
    uses: cloudposse/github-action-atmos-terraform-plan@v1
    with:
      component: "foobar"
      stack: "plat-ue2-sandbox"
      component-path: "components/terraform/s3-bucket"
      terraform-plan-role: "arn:aws:iam::111111111111:role/acme-core-gbl-identity-gitops"
      terraform-state-bucket: "acme-core-ue2-auto-gitops"
      terraform-state-role: "arn:aws:iam::999999999999:role/acme-core-ue2-auto-gitops-gha"
      terraform-state-table: "acme-core-ue2-auto-gitops"
      aws-region: "us-east-2"

Check out these related projects.

For additional context, refer to some of these links.

• github-action-atmos-terraform-apply - Companion GitHub Action to apply Terraform for a given component
• github-action-terraform-plan-storage - GitHub Action to store Terraform plans

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For 🐛 bug reports & feature requests, please use the issue tracker.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

1. Review our Code of Conduct and Contributor Guidelines.
2. Fork the repo on GitHub
3. Clone the project to your own machine
4. Commit changes to your own branch
5. Push your work back up to your fork
6. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

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