pr-build-image.yaml

# Copyright Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

name: PR Build Image

on:
  pull_request_target:
    paths-ignore:
      - 'docs/**'

concurrency:
  group: ${{ github.workflow }}-${{ github.event.number || github.event.pull_request.head.ref }}
  cancel-in-progress: true

env:
  REGISTRY: quay.io

jobs:
  build-image:
    name: Build Image
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      pull-requests: write

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.ref }}
          repository: ${{ github.event.pull_request.head.repo.full_name }}

      - name: Get the latest commits from base branch
        run: |
          git remote add base-origin https://github.com/${{ github.repository }} || true
          git config user.name "${{ github.event.pull_request.user.login }}"
          git config user.email "${{ github.event.pull_request.user.email }}"
          echo "Updating PR with latest commits from ${{ github.event.pull_request.base.ref }} ..."
          git fetch base-origin ${{ github.event.pull_request.base.ref }}
          git merge --no-edit base-origin/${{ github.event.pull_request.base.ref }}

      - name: Determine Changed Files
        id: changes
        run: |
          BASE_COMMIT=${{ github.event.pull_request.base.sha }}
          HEAD_COMMIT=${{ github.event.pull_request.head.sha }}

          CHANGED_FILES=$(git diff --name-only "$BASE_COMMIT" "$HEAD_COMMIT")

          echo "Changed files:"
          echo "$CHANGED_FILES"

          if echo "$CHANGED_FILES" | grep -qv '^e2e-tests/'; then
            echo "Changes detected outside the e2e-tests folder. Proceeding with the build."
            echo "proceed_with_build=true" >> $GITHUB_ENV
          else
            echo "No changes outside the e2e-tests folder. Skipping the build."
            echo "proceed_with_build=false" >> $GITHUB_ENV
          fi

      - name: Get the last commit short SHA of the PR
        uses: ./.github/actions/get-sha

      - name: Check if Image Already Exists
        if: env.proceed_with_build == 'true'
        run: |
          IMAGE_TAG="pr-${{ github.event.number }}"
          IMAGE_NAME="${{ env.REGISTRY }}/janus-idp/backstage-showcase:${IMAGE_TAG}"

          HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" "https://quay.io/v2/janus-idp/backstage-showcase/manifests/${IMAGE_TAG}")

          if [ "$HTTP_CODE" -eq 200 ]; then
            echo "Image $IMAGE_NAME already exists. Skipping the build."
            echo "image_exists=true" >> $GITHUB_ENV
          else
            echo "Image $IMAGE_NAME does not exist. Proceeding with the build."
            echo "image_exists=false" >> $GITHUB_ENV
          fi

      - name: Build and Push with Buildx
        if: env.proceed_with_build == 'true' && env.image_exists == 'false'
        uses: ./.github/actions/docker-build
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.QUAY_USERNAME }}
          password: ${{ secrets.QUAY_TOKEN }}
          imageName: rhdh-community/rhdh
          imageTags: |
            type=ref,prefix=pr-,event=pr
            type=ref,prefix=pr-,suffix=-${{ env.SHORT_SHA }},event=pr
          imageLabels: quay.expires-after=14d
          push: true
          platform: linux/amd64

      - name: Comment the image pull link
        if: env.proceed_with_build == 'true' && env.image_exists == 'false'
        uses: actions/github-script@v7
        with:
          script: |
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: 'The image is available at:\n* [`quay.io/rhdh-community/rhdh:pr-${{ github.event.number }}`](https://quay.io/rhdh-community/rhdh:pr-${{ github.event.number }}) or\n* [`quay.io/rhdh-community/rhdh:pr-${{ github.event.number }}-${{ env.SHORT_SHA }}`](https://quay.io/rhdh-community/rhdh:pr-${{ github.event.number }}-${{ env.SHORT_SHA }})'
            })