This Github Action is used to remediate drift

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Introduction

This action is used for drift remediation.

There is another companion action github-action-atmos-terraform-drift-detection.

Usage

Config

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:
      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("-")

Important

Please note! This GitHub Action only works with atmos >= 1.63.0. If you are using atmos < 1.63.0 please use v1 version of this action.

Workflow example

In this example drift will be remediated when user sets label apply to an issue.

name: 👽 Atmos Terraform Drift Remediation
run-name: 👽 Atmos Terraform Drift Remediation

on:
  issues:
    types:
      - labeled
      - closed

permissions:
  id-token: write
  contents: read

jobs:
  remediate-drift:
    runs-on: ubuntu-latest
    name: Remediate Drift
    if: |
      github.event.action == 'labeled' &&
      contains(join(github.event.issue.labels.*.name, ','), 'apply')
    steps:
      - name: Remediate Drift
        uses: cloudposse/github-action-atmos-terraform-drift-remediation@v1
        with:
          issue-number: ${{ github.event.issue.number }}
          action: remediate
          atmos-config-path: ./rootfs/usr/local/etc/atmos/

  discard-drift:
    runs-on: ubuntu-latest
    name: Discard Drift
    if: |
      github.event.action == 'closed' &&
      !contains(join(github.event.issue.labels.*.name, ','), 'remediated')
    steps:
      - name: Discard Drift
        uses: cloudposse/github-action-atmos-terraform-drift-remediation@v1
        with:
          issue-number: ${{ github.event.issue.number }}
          action: discard
          atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml    

Migrating from v1 to v2

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

name
atmos-version
atmos-config-path

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

name	YAML path in atmos.yaml
aws-region	integrations.github.gitops.artifact-storage.region
terraform-state-bucket	integrations.github.gitops.artifact-storage.bucket
terraform-state-table	integrations.github.gitops.artifact-storage.table
terraform-state-role	integrations.github.gitops.artifact-storage.role
terraform-plan-role	integrations.github.gitops.role.plan
terraform-apply-role	integrations.github.gitops.role.apply
terraform-version	integrations.github.gitops.terraform-version
enable-infracost	integrations.github.gitops.infracost-enabled
sort-by	integrations.github.gitops.matrix.sort-by
group-by	integrations.github.gitops.matrix.group-by

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: Remediate Drift
  uses: cloudposse/github-action-atmos-terraform-drift-remediation@v2
  with:
    issue-number: ${{ github.event.issue.number }}
    action: remediate
    atmos-config-path: ./rootfs/usr/local/etc/atmos/  

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: Remediate Drift
  uses: cloudposse/github-action-atmos-terraform-drift-remediation@v1
  with:
    issue-number: ${{ github.event.issue.number }}
    action: remediate
    atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml    

Migrating from v0 to v1

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 v1 as inv0 you should create config ./.github/config/atmos-gitops.yaml with the same variables as in v0 inputs.

  - name: Remediate Drift
    uses: cloudposse/github-action-atmos-terraform-drift-remediation@v1
    with:
      issue-number: ${{ github.event.issue.number }}
      action: remediate
      atmos-gitops-config-path: ./.github/config/atmos-gitops.yaml  

Which would produce the same behavior as in v0, doing this:

  - name: Remediate Drift
    uses: cloudposse/github-action-atmos-terraform-drift-remediation@v0
    with:
      issue-number: ${{ github.event.issue.number }}
      action: remediate
      atmos-config-path: "${{ github.workspace }}/rootfs/usr/local/etc/atmos/"
      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"

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Inputs

Name	Description	Default	Required
action	Drift remediation action. One of ['remediate', 'discard']	remediate	false
atmos-config-path	The path to the atmos.yaml file	N/A	true
atmos-version	The version of atmos to install	>= 1.63.0	false
debug	Enable action debug mode. Default: 'false'	false	false
issue-number	Issue Number	N/A	true
token	Used to pull node distributions for Atmos from Cloud Posse's GitHub repository. Since there's a default, this is typically not supplied by the user. When running this action on github.com, the default value is sufficient. When running on GHES, you can pass a personal access token for github.com if you are experiencing rate limiting.	${{ github.server_url == 'https://github.com' && github.token || '' }}	false

Related Projects

Check out these related projects.

References

For additional context, refer to some of these links.

• github-action-atmos-terraform-drift-detection - Companion GitHub Action for detection
• github-action-atmos-terraform-select-components - Companion GitHub Action to select components that are suitable for drift detection
• github-action-terraform-plan-storage - A GitHub Action to securely store Terraform plan files in an S3 bucket with metadata storage in DynamoDB.
• github-action-terraform-plan - GitHub Action to do Terraform Plan
• github-action-terraform-apply - GitHub Action to do Terraform Apply

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Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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