het-terraform-actions-workflow

gistfile1.txt

name: 'Hetzner Terraform Plan/Apply'

on:
  push:
    branches:
    - main
    paths:
    - 'infra-hetzner/**'

        
#Special permissions required for OIDC authentication

permissions:
  id-token: write
  contents: read
  pull-requests: write
  security-events: write # for github/codeql-action/upload-sarif to upload SARIF results
  actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status

#These environment variables are used by the terraform azure provider to setup OIDD authenticate. 
env:
  ARM_CLIENT_ID: "${{ vars.ARM_CLIENT_ID }}"
  ARM_SUBSCRIPTION_ID: "${{ vars.ARM_SUBSCRIPTION_ID }}"
  ARM_TENANT_ID: "${{ vars.ARM_TENANT_ID }}"
  HCLOUD_TOKEN: "${{ secrets.HCLOUD_TOKEN }}"
  CLOUDFLARE_TOKEN: "${{ secrets.CLOUDFLARE_TOKEN }}"

jobs:
  terraform-plan:
    name: 'Terraform Plan'
    runs-on: ubuntu-latest
    if: github.event_name == 'push' || (github.event_name == 'pull_request' && github.event.action == 'opened')
    # environment: prod-hetzner
    outputs:
      tfplanExitCode: ${{ steps.tf-plan.outputs.exitcode }}

    steps:
    # Checkout the repository to the GitHub Actions runner
    - name: Checkout
      uses: actions/checkout@v4

    # Install the latest version of the Terraform CLI
    - name: Setup Terraform
      uses: hashicorp/setup-terraform@v3
      with:
        terraform_wrapper: false
    - name: 'Az CLI login'
      uses: azure/login@v1
      with:
        client-id: ${{ vars.ARM_CLIENT_ID }}
        tenant-id: ${{ vars.ARM_TENANT_ID }}
        subscription-id: ${{ vars.ARM_SUBSCRIPTION_ID }}
        # creds: ${{ secrets.AZURE_CREDENTIALS }}/

    # Initialize a new or existing Terraform working directory by creating initial files, loading any remote state, downloading modules, etc.
    - name: Terraform Init
      run: terraform init
      working-directory: infra-hetzner



    # Generates an execution plan for Terraform
    # An exit code of 0 indicated no changes, 1 a terraform failure, 2 there are pending changes.
    - name: Terraform Plan
      id: tf-plan
      working-directory: infra-hetzner
      run: |
        export exitcode=0
        terraform plan -detailed-exitcode -var hcloud_token=${{ secrets.HCLOUD_TOKEN }} -var cloudflare_token=${{ secrets.CLOUDFLARE_TOKEN }} -var tailscale_api_token=${{secrets.TAILSCALE_API_TOKEN}} -no-color -out tfplan || export exitcode=$?

        echo "exitcode=$exitcode" >> $GITHUB_OUTPUT
        
        if [ $exitcode -eq 1 ]; then
          echo Terraform Plan Failed!
          exit 1
        else 
          exit 0
        fi
        # Checks that all Terraform configuration files adhere to a canonical format
    # Will fail the build if not
    - name: Terraform Format
      run: terraform fmt -check
      working-directory: infra-hetzner
    
    - name: Checkov GitHub Action
      uses: bridgecrewio/checkov-action@v12
      with:
        # This will add both a CLI output to the console and create a results.sarif file
        output_format: cli,sarif
        output_file_path: console
        file: infra-hetzner/tfplan
        soft_fail: false
        

    # Save plan to artifacts  
    - name: Publish Terraform Plan
      uses: actions/upload-artifact@v4
      with:
        name: tfplan
        path: infra-hetzner/tfplan
        
    # Create string output of Terraform Plan
    - name: Create String Output
      id: tf-plan-string
      working-directory: infra-hetzner
      run: |
        TERRAFORM_PLAN=$(terraform show -no-color tfplan)
        
        delimiter="$(openssl rand -hex 8)"
        echo "summary<<${delimiter}" >> $GITHUB_OUTPUT
        echo "## Terraform Plan Output" >> $GITHUB_OUTPUT
        echo "<details><summary>Click to expand</summary>" >> $GITHUB_OUTPUT
        echo "" >> $GITHUB_OUTPUT
        echo '```terraform' >> $GITHUB_OUTPUT
        echo "$TERRAFORM_PLAN" >> $GITHUB_OUTPUT
        echo '```' >> $GITHUB_OUTPUT
        echo "</details>" >> $GITHUB_OUTPUT
        echo "${delimiter}" >> $GITHUB_OUTPUT
        
    # Publish Terraform Plan as task summary
    - name: Publish Terraform Plan to Task Summary
      working-directory: infra-hetzner
      env:
        SUMMARY: ${{ steps.tf-plan-string.outputs.summary }}
      run: |
        echo "$SUMMARY" >> $GITHUB_STEP_SUMMARY
      
    # If this is a PR post the changes
    - name: Push Terraform Output to PR
      if: github.ref != 'refs/heads/main'
      uses: actions/github-script@v7
      env:
        SUMMARY: "${{ steps.tf-plan-string.outputs.summary }}"
      with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const body = `${process.env.SUMMARY}`;
            github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: body
            })

                      
                
  terraform-apply:
    name: 'Terraform Apply'
    if: github.ref == 'refs/heads/main' && needs.terraform-plan.outputs.tfplanExitCode == 2
    runs-on: ubuntu-latest
    environment: prod-hetzner
    needs: [terraform-plan]
    
    steps:
    # Checkout the repository to the GitHub Actions runner
    - name: Checkout
      uses: actions/checkout@v4

    # Install the latest version of Terraform CLI and configure the Terraform CLI configuration file with a Terraform Cloud user API token
    - name: Setup Terraform
      uses: hashicorp/setup-terraform@v3
    - name: 'Az CLI login'
      uses: azure/login@v1
      with:
        client-id: ${{ vars.ARM_CLIENT_ID }}
        tenant-id: ${{ vars.ARM_TENANT_ID }}
        subscription-id: ${{ vars.ARM_SUBSCRIPTION_ID }}
        # creds: ${{ secrets.AZURE_CREDENTIALS }}

    # Initialize a new or existing Terraform working directory by creating initial files, loading any remote state, downloading modules, etc.
    - name: Terraform Init
      run: terraform init
      working-directory: infra-hetzner
    # Download saved plan from artifacts  
    - name: Download Terraform Plan
      uses: actions/download-artifact@v4
      with:
        name: tfplan
        path: infra-hetzner

    # Terraform Apply
    - name: Terraform Apply
      working-directory: infra-hetzner
      run: terraform apply -auto-approve tfplan