check-infra-deploy-status.yml

# This workflow checks the status of infrastructure deployments to see whether
# infrastructure code configuration matches the actual state of the infrastructure.
# It does this by checking that Terraform plans show an empty diff (no changes)
# across all root modules and backend configurations.
name: Check infra deploy status

on:
  workflow_dispatch:
  schedule:
    # Run every day at 07:00 UTC (3am ET, 12am PT) after engineers are likely done with work
    - cron: "0 7 * * *"

jobs:
  collect-configs:
    name: Collect configs
    runs-on: ubuntu-latest
    outputs:
      root_module_configs: ${{ steps.collect-infra-deploy-status-check-configs.outputs.root_module_configs }}
    steps:
      - uses: actions/checkout@v4
      - name: Collect root module configurations
        id: collect-infra-deploy-status-check-configs
        run: |
          root_module_configs="$(./bin/infra-deploy-status-check-configs)"
          echo "${root_module_configs}"
          echo "root_module_configs=${root_module_configs}" >> "$GITHUB_OUTPUT"
  check:
    name: ${{ matrix.root_module_subdir }} ${{ matrix.backend_config_name }}
    runs-on: ubuntu-latest
    needs: collect-configs

    # Skip this job if there are no root module configurations to check,
    # otherwise the GitHub actions will give the error: "Matrix must define at least one vector"
    if: ${{ needs.collect-configs.outputs.root_module_configs != '[]' }}

    strategy:
      fail-fast: false
      matrix:
        include: ${{ fromJson(needs.collect-configs.outputs.root_module_configs) }}

    permissions:
      contents: read
      id-token: write

    steps:
      - uses: actions/checkout@v4
      - name: Set up Terraform
        uses: ./.github/actions/setup-terraform

      - name: Configure AWS credentials
        uses: ./.github/actions/configure-aws-credentials
        with:
          account_name: ${{ matrix.infra_layer == 'accounts' && matrix.account_name || null }}
          network_name: ${{ matrix.infra_layer == 'networks' && matrix.backend_config_name || null }}
          app_name: ${{ contains(fromJSON('["build-repository", "database", "service"]'), matrix.infra_layer) && matrix.app_name || null }}
          environment: ${{ contains(fromJSON('["build-repository", "database", "service"]'), matrix.infra_layer) && matrix.backend_config_name || null }}

      - name: Check Terraform plan
        run: |
          echo "::group::Initialize Terraform"
          echo terraform -chdir="infra/${{ matrix.root_module_subdir }}" init -input=false -reconfigure -backend-config="${{ matrix.backend_config_name }}.s3.tfbackend"
          terraform -chdir="infra/${{ matrix.root_module_subdir }}" init -input=false -reconfigure -backend-config="${{ matrix.backend_config_name }}.s3.tfbackend"
          echo "::endgroup::"

          echo "::group::Check Terraform plan"
          echo terraform -chdir="infra/${{ matrix.root_module_subdir }}" plan -input=false -detailed-exitcode ${{ matrix.extra_params }}
          terraform -chdir="infra/${{ matrix.root_module_subdir }}" plan -input=false -detailed-exitcode ${{ matrix.extra_params }}
          echo "::endgroup::"
        env:
          TF_IN_AUTOMATION: "true"