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Prerequisites

  • Azure Cloud account

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1. Create Storage Account for locks

Go to Storage Accounts, press Create. Set name and press Review. Wait for deployment to complete. Click “Go to Resource”; go to Access keys (on the lefthand side) Click “show” on the connection string. Copy and save it securely; it will be needed later in this guide.

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2. Add Azure keys to Github Actions Secrets

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In Azure

Go to Azure Active Directory -> App Registrations Click New Registration; give name; click Register Take note of
  • Directory (Tenant) ID
  • Application (Client) ID
Go to Certificates and Secrets. Click New Client Secret. Give it a name; click Add. Take note of the Secret Value. Go to subscription in the portal and select your subscription ID, select Access Control (IAM) and Add the Role assignment, Contributor to your Service Principal. Take note of your Subscription ID value

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In Github

  • Go to Settings → Secrets and Variables
  • Click “New Repository Secret” button
  • Add a secret named ARM_CLIENT_ID with the value of your Application (Client) ID from above
  • Add a secret named ARM_TENANT_ID with the value of your Directory (Tenant) ID from above
  • Add a secret named ARM_CLIENT_SECRET with the value of your Client Secret from above
  • Add a secret named ARM_SUBSCRIPTION_ID with the value of your Subscription ID from above
  • Add a secret named DIGGER_AZURE_CONNECTION_STRING with the value of your Connection String from Step 1
In your repository settings > Actions ensure that the Workflow Read and Write permissions are assigned. This will allow the workflow to post comments on your PRs.

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4. Create digger.yml file

In your repository, create digger.yml file with the following contents: 
projects:
- name: infra-prod
  dir: prod

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5. Create a workflow file

In your repository, create a file at .github/workflows/infra.yml 
name: CI

on:
  pull_request:
    branches: [ "main" ]
    types: [ closed, opened, synchronize, reopened ]
  issue_comment:
    types: [created]
    if: contains(github.event.comment.body, 'digger')
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3

      - name: Checkout Pull Request
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_URL="${{ github.event.issue.pull_request.url }}"
          PR_NUM=${PR_URL##*/}
          echo "Checking out from PR #$PR_NUM based on URL: $PR_URL"
          hub pr checkout $PR_NUM
        if: github.event_name == 'issue_comment'
    
      - name: digger
        uses: diggerhq/digger@main
        env:
          GITHUB_CONTEXT: ${{ toJson(github) }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          LOCK_PROVIDER: azure
          DIGGER_AZURE_AUTH_METHOD: CONNECTION_STRING
          DIGGER_AZURE_CONNECTION_STRING: ${{ secrets.DIGGER_AZURE_CONNECTION_STRING }}
          ARM_CLIENT_ID: ${{ secrets.ARM_CLIENT_ID }}
          ARM_CLIENT_SECRET: ${{ secrets.ARM_CLIENT_SECRET }}
          ARM_TENANT_ID: ${{ secrets.ARM_TENANT_ID }}
          ARM_SUBSCRIPTION_ID: ${{ secrets.ARM_SUBSCRIPTION_ID }}

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6. Create a PR to verify that it works

Just make any change to Terraform - like add a blank line An action should start. After some time you should see a comment of lock being aquired in your PR. Something like this: 
Project diggerhq/azure-onboarding-test#infra-prod has been locked by PR #1