Terraform Configuration Drift Detection #175
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| name: 'Terraform Configuration Drift Detection' | |
| on: | |
| workflow_dispatch: | |
| schedule: | |
| - cron: '41 3 * * *' # runs nightly at 3:41 am | |
| #Special permissions required for OIDC authentication | |
| permissions: | |
| id-token: write | |
| contents: read | |
| issues: write | |
| #These environment variables are used by the terraform azure provider to setup OIDD authenticate. | |
| env: | |
| ARM_CLIENT_ID: "${{ secrets.AZURE_CLIENT_ID }}" | |
| ARM_SUBSCRIPTION_ID: "${{ secrets.AZURE_SUBSCRIPTION_ID }}" | |
| ARM_TENANT_ID: "${{ secrets.AZURE_TENANT_ID }}" | |
| jobs: | |
| terraform-plan: | |
| name: 'Terraform Plan' | |
| runs-on: ubuntu-latest | |
| env: | |
| #this is needed since we are running terraform with read-only permissions | |
| ARM_SKIP_PROVIDER_REGISTRATION: true | |
| outputs: | |
| tfplanExitCode: ${{ steps.tf-plan.outputs.exitcode }} | |
| steps: | |
| # Checkout the repository to the GitHub Actions runner | |
| - name: Checkout | |
| uses: actions/checkout@v4 | |
| # Install the latest version of the Terraform CLI | |
| - name: Setup Terraform | |
| uses: hashicorp/setup-terraform@v4 | |
| with: | |
| terraform_wrapper: false | |
| # Initialize a new or existing Terraform working directory by creating initial files, loading any remote state, downloading modules, etc. | |
| - name: Terraform Init | |
| run: terraform init | |
| # Generates an execution plan for Terraform | |
| # An exit code of 0 indicated no changes, 1 a terraform failure, 2 there are pending changes. | |
| - name: Terraform Plan | |
| id: tf-plan | |
| run: | | |
| export exitcode=0 | |
| terraform plan -detailed-exitcode -no-color -out tfplan || export exitcode=$? | |
| echo "exitcode=$exitcode" >> $GITHUB_OUTPUT | |
| if [ $exitcode -eq 1 ]; then | |
| echo Terraform Plan Failed! | |
| exit 1 | |
| else | |
| exit 0 | |
| fi | |
| # Save plan to artifacts | |
| - name: Publish Terraform Plan | |
| uses: actions/upload-artifact@v4 | |
| with: | |
| name: tfplan | |
| path: tfplan | |
| # Create string output of Terraform Plan | |
| - name: Create String Output | |
| id: tf-plan-string | |
| run: | | |
| TERRAFORM_PLAN=$(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 | |
| env: | |
| SUMMARY: ${{ steps.tf-plan-string.outputs.summary }} | |
| run: | | |
| echo "$SUMMARY" >> $GITHUB_STEP_SUMMARY | |
| # If changes are detected, create a new issue | |
| - name: Publish Drift Report | |
| if: steps.tf-plan.outputs.exitcode == 2 | |
| uses: actions/github-script@v7 | |
| env: | |
| SUMMARY: "${{ steps.tf-plan-string.outputs.summary }}" | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| const body = `${process.env.SUMMARY}`; | |
| const title = 'Terraform Configuration Drift Detected'; | |
| const creator = 'github-actions[bot]' | |
| // Look to see if there is an existing drift issue | |
| const issues = await github.rest.issues.listForRepo({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| state: 'open', | |
| creator: creator, | |
| title: title | |
| }) | |
| if( issues.data.length > 0 ) { | |
| // We assume there shouldn't be more than 1 open issue, since we update any issue we find | |
| const issue = issues.data[0] | |
| if ( issue.body == body ) { | |
| console.log('Drift Detected: Found matching issue with duplicate content') | |
| } else { | |
| console.log('Drift Detected: Found matching issue, updating body') | |
| github.rest.issues.update({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: issue.number, | |
| body: body | |
| }) | |
| } | |
| } else { | |
| console.log('Drift Detected: Creating new issue') | |
| github.rest.issues.create({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| title: title, | |
| body: body | |
| }) | |
| } | |
| # If changes aren't detected, close any open drift issues | |
| - name: Publish Drift Report | |
| if: steps.tf-plan.outputs.exitcode == 0 | |
| uses: actions/github-script@v7 | |
| with: | |
| github-token: ${{ secrets.GITHUB_TOKEN }} | |
| script: | | |
| const title = 'Terraform Configuration Drift Detected'; | |
| const creator = 'github-actions[bot]' | |
| // Look to see if there is an existing drift issue | |
| const issues = await github.rest.issues.listForRepo({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| state: 'open', | |
| creator: creator, | |
| title: title | |
| }) | |
| if( issues.data.length > 0 ) { | |
| const issue = issues.data[0] | |
| github.rest.issues.update({ | |
| owner: context.repo.owner, | |
| repo: context.repo.repo, | |
| issue_number: issue.number, | |
| state: 'closed' | |
| }) | |
| } | |
| # Mark the workflow as failed if drift detected | |
| - name: Error on Failure | |
| if: steps.tf-plan.outputs.exitcode == 2 | |
| run: exit 1 |