terraform-deploy-aws-curvenote.yml

# See terraform/aws/curvenote/README.md
name: Terraform aws-curvenote

on:
  push:
    branches:
      - main
    paths:
      - "terraform/aws/curvenote/**"
      - .github/workflows/terraform-deploy-aws-curvenote.yml
  workflow_dispatch:

# Only allow one workflow to run at a time
concurrency: terraform-deploy-aws-curvenote

env:
  TFPLAN: aws-curvenote.tfplan
  AWS_DEPLOYMENT_ROLE: arn:aws:iam::166088433508:role/binderhub-github-oidc-mybinderorgdeploy-terraform
  AWS_REGION: us-east-2
  WORKDIR: ./terraform/aws/curvenote

jobs:
  terraform-plan:
    runs-on: ubuntu-22.04
    timeout-minutes: 10
    # These permissions are needed to interact with GitHub's OIDC Token endpoint.
    permissions:
      id-token: write
      contents: read
    defaults:
      run:
        working-directory: ${{ env.WORKDIR }}
    outputs:
      apply: ${{ steps.terraform-plan.outputs.apply }}

    steps:
      - uses: actions/checkout@v4

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          role-to-assume: ${{ env.AWS_DEPLOYMENT_ROLE }}
          aws-region: ${{ env.AWS_REGION }}
          role-session-name: terraform-plan

      # Capture the console output of terraform plan to a file, so we can include
      # it as a job summary in the Actions view:
      # https://github.blog/2022-05-09-supercharging-github-actions-with-job-summaries/
      - name: Terraform plan
        id: terraform-plan
        run: |
          terraform init
          terraform plan -out="${TFPLAN}" -detailed-exitcode -no-color | tee tfplan.stdout
          # Get the exit code of the terraform plan command, not the tee command.
          EXIT_CODE="${PIPESTATUS[0]}"
          if [ $EXIT_CODE -eq 0 ]; then
            echo "No changes"
            echo "apply=false" >> "$GITHUB_OUTPUT"
          elif [ $EXIT_CODE -eq 2 ]; then
            echo "Changes found"
            echo "apply=true" >> "$GITHUB_OUTPUT"
          else
            echo "Terraform plan failed"
            exit $EXIT_CODE
          fi

      # Skip the first bit of the terraform plan stdout
      # https://unix.stackexchange.com/a/205680
      - name: Set job summary
        if: steps.terraform-plan.outputs.apply == 'true'
        run: |
          echo '### Terraform Plan summary' >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY
          sed -n '/Terraform will perform the following/,$p' tfplan.stdout >> $GITHUB_STEP_SUMMARY
          echo '```' >> $GITHUB_STEP_SUMMARY

      - name: Install age
        if: steps.terraform-plan.outputs.apply == 'true'
        run: |
          sudo apt-get update -y -q
          sudo apt-get install -y -q age

      - name: Encrypt plan
        if: steps.terraform-plan.outputs.apply == 'true'
        run: |
          echo ${{ secrets.TFPLAN_ARTIFACT_SECRET_KEY }} > tfplan.key
          age --identity tfplan.key --encrypt --output "${TFPLAN}.enc" "${TFPLAN}"

      - name: Upload plan
        if: steps.terraform-plan.outputs.apply == 'true'
        uses: actions/upload-artifact@v3
        with:
          name: ${{ env.TFPLAN }}
          path: ${{ env.WORKDIR }}/${{ env.TFPLAN }}.enc
          if-no-files-found: error

  terraform-apply:
    needs:
      - terraform-plan
    runs-on: ubuntu-22.04
    timeout-minutes: 60
    # This environment requires approval before the deploy is run.
    environment: aws-curvenote
    # These permissions are needed to interact with GitHub's OIDC Token endpoint.
    permissions:
      id-token: write
      contents: read
    defaults:
      run:
        working-directory: ${{ env.WORKDIR }}
    if: needs.terraform-plan.outputs.apply == 'true'

    steps:
      - uses: actions/checkout@v4

      - name: Configure AWS credentials
        uses: aws-actions/configure-aws-credentials@v4
        with:
          role-to-assume: ${{ env.AWS_DEPLOYMENT_ROLE }}
          aws-region: ${{ env.AWS_REGION }}
          role-session-name: terraform-apply

      - name: Download plan
        uses: actions/download-artifact@v3
        with:
          name: ${{ env.TFPLAN }}
          path: ${{ env.WORKDIR }}

      - name: Install age
        run: |
          sudo apt-get update -y -q
          sudo apt-get install -y -q age

      - name: Decrypt plan
        run: |
          echo ${{ secrets.TFPLAN_ARTIFACT_SECRET_KEY }} > tfplan.key
          age --identity tfplan.key --decrypt --output "${TFPLAN}" "${TFPLAN}.enc"

      - name: Terraform apply
        run: |
          terraform init
          terraform apply "${TFPLAN}"