terraform-v3-k8s.yml

name: "Terraform V3 K8S"

on:
  pull_request:
    branches: [main]
    paths: ["IaC/3-v3/aws/**"]
  workflow_dispatch:
    inputs:
      action:
        description: "실행할 Terraform 작업"
        required: true
        type: choice
        options:
          - plan
          - apply
      ref:
        description: "체크아웃할 커밋 SHA (apply 시 필수, plan은 선택)"
        required: false
        type: string

concurrency:
  group: terraform-v3-k8s-dev
  cancel-in-progress: false

permissions:
  id-token: write
  contents: read
  pull-requests: write

env:
  TF_VERSION: "1.14.6"
  WORKING_DIR: "IaC/3-v3/aws/environments/k8s-dev"
  AWS_REGION: "ap-northeast-2"

jobs:
  # ──────────────────────────────────────────────
  # Plan: PR 또는 수동 트리거
  # ──────────────────────────────────────────────
  plan:
    name: "Terraform Plan"
    runs-on: ubuntu-latest
    outputs:
      plan_exitcode: ${{ steps.plan.outputs.exitcode }}
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref || '' }}

      - uses: aws-actions/configure-aws-credentials@v4
        with:
          role-to-assume: ${{ secrets.TF_AWS_ROLE_ARN }}
          aws-region: ${{ env.AWS_REGION }}

      - uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: ${{ env.TF_VERSION }}

      - name: Terraform fmt
        id: fmt
        run: terraform fmt -check -recursive -diff
        working-directory: IaC/3-v3/aws
        continue-on-error: true

      - name: Terraform Init
        id: init
        run: terraform init -backend-config=backend.hcl -backend-config="profile=" -input=false
        working-directory: ${{ env.WORKING_DIR }}

      - name: Terraform Validate
        id: validate
        run: terraform validate -no-color
        working-directory: ${{ env.WORKING_DIR }}

      - name: Terraform Plan
        id: plan
        run: |
          terraform plan \
            -var="vpc_id=${{ secrets.K8S_DEV_VPC_ID }}" \
            -var="ssl_certificate_arn=${{ secrets.K8S_DEV_SSL_CERT_ARN }}" \
            -input=false -no-color -detailed-exitcode -out=tfplan \
            2>&1 | tee plan_output.txt
        working-directory: ${{ env.WORKING_DIR }}
        continue-on-error: true

      - name: Comment Plan on PR
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const planPath = '${{ env.WORKING_DIR }}/plan_output.txt';
            let plan = fs.existsSync(planPath) ? fs.readFileSync(planPath, 'utf8') : 'Plan output not available';
            if (plan.length > 60000) plan = plan.substring(0, 60000) + '\n... (truncated)';

            const body = `### Terraform Plan Result
            | Step | Status |
            |------|--------|
            | Format | ${'${{ steps.fmt.outcome }}' === 'success' ? '✅' : '❌'} |
            | Init | ${'${{ steps.init.outcome }}' === 'success' ? '✅' : '❌'} |
            | Validate | ${'${{ steps.validate.outcome }}' === 'success' ? '✅' : '❌'} |
            | Plan | ${'${{ steps.plan.outcome }}' === 'success' ? '✅ (no changes)' : '⚠️ (has changes)'} |

            <details><summary>Plan Output</summary>

            \`\`\`terraform
            ${plan}
            \`\`\`

            </details>

            *Pushed by: @${{ github.actor }}*`;

            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner, repo: context.repo.repo,
              issue_number: context.issue.number
            });
            const bot = comments.find(c => c.user.type === 'Bot' && c.body.includes('Terraform Plan Result'));
            const params = { owner: context.repo.owner, repo: context.repo.repo, body };
            if (bot) { await github.rest.issues.updateComment({ ...params, comment_id: bot.id }); }
            else { await github.rest.issues.createComment({ ...params, issue_number: context.issue.number }); }

      - name: Fail on Error
        if: steps.plan.outputs.exitcode == '1'
        run: exit 1

      - name: Upload Plan
        if: steps.plan.outputs.exitcode == '2'
        uses: actions/upload-artifact@v4
        with:
          name: tfplan
          path: ${{ env.WORKING_DIR }}/tfplan
          retention-days: 5

  # ──────────────────────────────────────────────
  # Apply: 수동 트리거만 (workflow_dispatch + action=apply)
  # ──────────────────────────────────────────────
  apply:
    name: "Terraform Apply"
    needs: plan
    if: >-
      github.event_name == 'workflow_dispatch' &&
      github.event.inputs.action == 'apply' &&
      github.event.inputs.ref != '' &&
      needs.plan.outputs.plan_exitcode == '2'
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: ${{ inputs.ref }}

      - uses: aws-actions/configure-aws-credentials@v4
        with:
          role-to-assume: ${{ secrets.TF_AWS_ROLE_ARN }}
          aws-region: ${{ env.AWS_REGION }}

      - uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: ${{ env.TF_VERSION }}
          terraform_wrapper: false

      - name: Terraform Init
        run: terraform init -backend-config=backend.hcl -backend-config="profile=" -input=false
        working-directory: ${{ env.WORKING_DIR }}

      - uses: actions/download-artifact@v4
        with:
          name: tfplan
          path: ${{ env.WORKING_DIR }}

      - name: Terraform Apply
        run: terraform apply -input=false tfplan
        working-directory: ${{ env.WORKING_DIR }}