build-gablue-main.yml

---
name: build-gablue-main
on:
  pull_request:
    branches:
      - main
  schedule:
    - cron: "00 06 * * *" # build at 06:00 UTC every day
                          # (20 minutes after last ublue images start building)
  push:
    branches:
      - main
    paths-ignore:
      - '**/README.md'
  workflow_dispatch:

env:
  MY_IMAGE_NAME: "gablue-main"  # the name of the image produced by this build, matches repo names
  MY_IMAGE_DESC: "Gablue main image"
  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"  # do not edit
  KERNEL_VER: "6.12.5-201.bazzite.fc41.x86_64"

jobs:
  build_push:
    name: Build and push image
    runs-on: ubuntu-24.04

    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      # Checkout push-to-registry action GitHub repository
      - name: Checkout Push to Registry action
        uses: actions/checkout@v4

      - name: Maximize build space
        uses: ublue-os/remove-unwanted-software@v7

      - name: Generate tags
        id: generate-tags
        shell: bash
        run: |
          # Generate a timestamp for creating an image version history
          TIMESTAMP="$(date +%Y%m%d)"
          TIMESTAMPWT="$(date -d '+2 hours' +%Y%m%d-%Hh%M)"
          COMMIT_TAGS=()
          BUILD_TAGS=()

          # Have tags for tracking builds during pull request
          SHA_SHORT="${GITHUB_SHA::7}"
          COMMIT_TAGS+=("pr-${{ github.event.number }}")
          COMMIT_TAGS+=("${SHA_SHORT}")

          # Append matching timestamp tags to keep a version history
          for TAG in "${BUILD_TAGS[@]}"; do
              BUILD_TAGS+=("${TAG}-${TIMESTAMP}")
          done

          BUILD_TAGS+=("${TIMESTAMP}")
          BUILD_TAGS+=("${TIMESTAMPWT}")
          BUILD_TAGS+=("latest")

          if [[ "${{ github.event_name }}" == "pull_request" ]]; then
              echo "Generated the following commit tags: "
              for TAG in "${COMMIT_TAGS[@]}"; do
                  echo "${TAG}"
              done

              alias_tags=("${COMMIT_TAGS[@]}")
          else
              alias_tags=("${BUILD_TAGS[@]}")
          fi

          echo "Generated the following build tags: "
          for TAG in "${BUILD_TAGS[@]}"; do
              echo "${TAG}"
          done

          echo "alias_tags=${alias_tags[*]}" >> $GITHUB_OUTPUT

          # Take only the date for versionning
          echo "alias_date=${TIMESTAMPWT}" >> $GITHUB_OUTPUT

      # Build metadata
      - name: Image Metadata
        uses: docker/metadata-action@v5
        id: meta
        with:
          images: |
            ${{ env.MY_IMAGE_NAME }}

          labels: |
            io.artifacthub.package.readme-url=https://raw.githubusercontent.com/${{ github.repository }}/main/README.md
            org.opencontainers.image.description=${{ env.MY_IMAGE_DESC }}
            org.opencontainers.image.title=${{ env.MY_IMAGE_NAME }}

      - name: Build Image
        id: build_image
        shell: bash
        run: |
          sudo buildah build \
            --file "Containerfile-main" \
            --format "docker" \
            --tag raw-img .

      - name: Rechunk Image
        id: rechunk
        uses: hhd-dev/rechunk@v1.0.1
        with:
          ref: "raw-img"
          prev-ref: "${{ env.IMAGE_REGISTRY }}/${{ env.MY_IMAGE_NAME }}:latest"
          skip_compression: true
          version: "${{ steps.generate-tags.outputs.alias_date }}"
          rechunk: "ghcr.io/hhd-dev/rechunk:v0.8.6"

      - name: Load in podman and tag
        run: |
          IMAGE=$(podman pull ${{ steps.rechunk.outputs.ref }})
          sudo rm -rf ${{ steps.rechunk.outputs.output }}
          podman tag $IMAGE ${{ env.MY_IMAGE_NAME }}:${{ steps.generate-tags.outputs.alias_tags }}
          podman tag $IMAGE ${{ env.MY_IMAGE_NAME }}:${{ steps.generate-tags.outputs.alias_date }}
          podman tag $IMAGE ${{ env.MY_IMAGE_NAME }}:latest
          # keep for secureboot check
          podman tag $IMAGE rechunked-img

      - name: Check Secureboot
        shell: bash
        run: |
          set -x
          if [[ ! $(command -v sbverify) || ! $(command -v curl) || ! $(command -v openssl) ]]; then
            sudo apt update
            sudo apt install sbsigntool curl openssl
          fi
          TMP=$(podman create rechunked-img bash)
          podman cp $TMP:/usr/lib/modules/${{ env.KERNEL_VER }}/vmlinuz .
          podman rm $TMP
          sbverify --list vmlinuz
          curl --retry 3 -Lo kernel-sign.der https://github.com/ublue-os/kernel-cache/raw/main/certs/public_key.der
          curl --retry 3 -Lo akmods.der https://github.com/ublue-os/kernel-cache/raw/main/certs/public_key_2.der
          openssl x509 -in kernel-sign.der -out kernel-sign.crt
          openssl x509 -in akmods.der -out akmods.crt
          sbverify --cert kernel-sign.crt vmlinuz || exit 1
          sbverify --cert akmods.crt vmlinuz || exit 1

      # Workaround bug where capital letters in your GitHub username make it impossible to push to GHCR.
      # https://github.com/macbre/push-to-ghcr/issues/12
      - name: Lowercase Registry
        id: registry_case
        uses: ASzc/change-string-case-action@v6
        with:
          string: ${{ env.IMAGE_REGISTRY }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Push the image to GHCR (Image Registry)
      - name: Push To GHCR
        uses: Wandalen/wretry.action@v3.7.3
        id: push
        env:
          REGISTRY_USER: ${{ github.actor }}
          REGISTRY_PASSWORD: ${{ github.token }}
        with:
          action: redhat-actions/push-to-registry@v2
          attempt_limit: 3
          attempt_delay: 15000
          with: |
            image: ${{ env.MY_IMAGE_NAME }}
            tags: ${{ steps.generate-tags.outputs.alias_tags }}
            registry: ${{ steps.registry_case.outputs.lowercase }}
            username: ${{ env.REGISTRY_USER }}
            password: ${{ env.REGISTRY_PASSWORD }}


      # This section is optional and only needs to be enabled in you plan on distributing
      # your project to others to consume. You will need to create a public and private key
      # using Cosign and save the private key as a repository secret in Github for this workflow
      # to consume. For more details, review the image signing section of the README.

      # Sign container
      - uses: sigstore/cosign-installer@v3.7.0
        if: github.event_name != 'pull_request'

      - name: Sign container image
        if: github.event_name != 'pull_request'
        run: |
          cosign sign -y --key env://COSIGN_PRIVATE_KEY ${{ steps.registry_case.outputs.lowercase }}/${{ env.MY_IMAGE_NAME }}@${TAGS}
        env:
          TAGS: ${{ steps.push.outputs.outputs && fromJSON(steps.push.outputs.outputs).digest }}
          COSIGN_EXPERIMENTAL: false
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}