development-pipeline-deletion-event.yml

# This pipeline create a new pipeline in AWS CodePipeline if the branch follows the desired pattern defined in BRANCH_PATTERN.
name: "Delete branch and delete AWS CodePipeline" 

on:
  delete:
    branches:
      - 'openwrt-2*'

env:
  BRANCH_PATTERN: openwrt-2[0-9]{1}\.[0-9]{2}$
  TERRAFORM_VERSION: 1.7.4
  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}

jobs:
  branch_created:
    runs-on: ubuntu-latest
    steps:
      - name: Check out repository
        uses: actions/checkout@v4
              
      - name: Get branch name
        run: | 
            echo "BRANCH_NAME=${{ github.event.ref }}" >> $GITHUB_ENV
      
      - name: Verify branch name
        run: |
          if [[ ! "${BRANCH_NAME}" =~ $BRANCH_PATTERN ]]; then
            echo "Branch name doesn't match the pattern."
            echo "VALID_BRANCH=false" >> $GITHUB_ENV
          else
            echo "New branch created $GITHUB_REF"
            echo "VALID_BRANCH=true" >> $GITHUB_ENV
          fi

      - name: Set up Terraform
        if: env.VALID_BRANCH == 'true'
        uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: $TERRAFORM_VERSION
          
      - name: Terraform Init 
        if: env.VALID_BRANCH == 'true'
        run: |
          cd .terraform/pipeline
          terraform init

      - name: Terraform Select Workspace
        if: env.VALID_BRANCH == 'true'
        run: |
          cd .terraform/pipeline
          terraform workspace select $BRANCH_NAME
          echo "Current Workspace is $(terraform workspace show)"
          sed -i "/stage_vars = {/a \ \ \"\${{ env.BRANCH_NAME }}\" = {\n \ \ \ branch = \"\${{ env.BRANCH_NAME }}\"\n \ \ }" terraform.tfvars

      - name: Check Terraform Workspace
        if: env.VALID_BRANCH == 'true'
        run: |
          cd .terraform/pipeline
          if [ -z "$(terraform state list)" ]; then
            echo "TF_IS_EMPTY=true" >> $GITHUB_ENV
            echo "Workspace Terraform is empty"
          else 
            echo "TF_IS_EMPTY=false" >> $GITHUB_ENV
            echo "Workspace Terraform is not empty"
          fi

      - name: Terraform Update Bucket Force Deletion
        if: env.VALID_BRANCH == 'true' && env.TF_IS_EMPTY == 'false'
        run: |
          cd .terraform/pipeline
          sed -i '/^resource "aws_s3_bucket" "codepipeline_bucket" {/a force_destroy = true' main.tf
          terraform apply -auto-approve -var="buildspec_file_name=development-buildspec.yml"
      
      - name: Terraform Destroy && env.TF_IS_EMPTY == 'false'
        if: env.VALID_BRANCH == 'true'
        run: |
          cd .terraform/pipeline
          terraform destroy -auto-approve

      - name: Terraform Delete Workspace
        if: env.VALID_BRANCH == 'true'
        run: |
          cd .terraform/pipeline
          terraform workspace select default
          terraform workspace delete $BRANCH_NAME
          echo "Workspace $BRANCH_NAME deleted"

      - name: NOTHING TO DO
        if: env.VALID_BRANCH == 'false'
        run: echo "THIS BRANCH DOES NOT CREATE A NEW AWS CODEPIPELINE"