name: Build container image

on:
  #pull_request:
    #branches:
      #- main
  schedule:
    - cron: '05 12 * * 2,5'
  workflow_dispatch:

env:
  IMAGE_DESC: "Custom Fedora bootc image"
  IMAGE_NAME: "${{ github.event.repository.name }}"
  DEFAULT_TAG: "stable"

concurrency:
  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
  cancel-in-progress: true

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

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

    steps:
      - name: Prepare environment
        run: |
          REGISTRY_HOST=$(echo "${{ github.server_url }}" | awk -F/ '{print $3}')
          OWNER_LOWER="${{ github.repository_owner }}"
          NAME_LOWER="${{ env.IMAGE_NAME }}"

          echo "REGISTRY_HOST=${REGISTRY_HOST}" >> ${GITHUB_ENV}
          echo "IMAGE_REGISTRY=${REGISTRY_HOST}/${OWNER_LOWER,,}" >> ${GITHUB_ENV}
          echo "IMAGE_NAME=${NAME_LOWER,,}" >> ${GITHUB_ENV}

      - name: Determine image tag
        run: |
          BRANCH="$GITHUB_REF_NAME"
          if [[ "$BRANCH" == "main" ]]; then
            echo "IMAGE_TAG=${DEFAULT_TAG}" >> ${GITHUB_ENV}
            echo "IS_TEST_BUILD=false" >> ${GITHUB_ENV}
          else
            SANITIZED=$(echo "$BRANCH" | sed 's/[^a-zA-Z0-9._-]/-/g' | head -c 50)
            echo "IMAGE_TAG=test-${SANITIZED}" >> ${GITHUB_ENV}
            echo "IS_TEST_BUILD=true" >> ${GITHUB_ENV}
          fi

      - name: Checkout
        # Abgesichert: entspricht actions/checkout@v5.0.0 (oder aktuellste v5-Commit)
        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v5.0.0

      - name: Image Metadata
        id: metadata
        # Abgesichert: entspricht docker/metadata-action@v5.7.0
        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 # v5.7.0
        with:
          images: ${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=raw,value=${{ env.IMAGE_TAG }}
            type=raw,value=${{ env.IMAGE_TAG }}.{{date 'YYYYMMDD'}},enable=${{ env.IS_TEST_BUILD == 'false' }}
            type=raw,value={{date 'YYYYMMDD'}},enable=${{ env.IS_TEST_BUILD == 'false' }}
            type=sha,enable=${{ github.event_name == 'pull_request' }}
            type=ref,event=pr
          labels: |
            org.opencontainers.image.created={{date 'YYYY-MM-DDTHH:mm:ssZ'}}
            org.opencontainers.image.description=${{ env.IMAGE_DESC }}
            org.opencontainers.image.documentation=${{ github.server_url }}/${{ github.repository }}/raw/commit/${{ github.sha }}/README.md
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}/src/commit/${{ github.sha }}/Containerfile
            org.opencontainers.image.title=${{ env.IMAGE_NAME }}
            org.opencontainers.image.url=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.vendor=${{ github.repository_owner }}
            org.opencontainers.image.version=${{ env.IMAGE_TAG }}.{{date 'YYYYMMDD'}}
            containers.bootc=1
            ostree.bootable=1

      - name: Login to Gitea Container Registry (Buildah)
        if: github.event_name != 'pull_request'
        run: |
          echo "${{ secrets.REGISTRY }}" | buildah login -u "${{ github.repository_owner }}" --password-stdin ${{ env.REGISTRY_HOST }}

      - name: 1. Build Base OS Image (Rootless)
        run: |
          LABEL_ARGS=()
          while IFS= read -r line; do
            if [[ -n "$line" ]]; then
              LABEL_ARGS+=("--label" "$line")
            fi
          done <<< "${{ steps.metadata.outputs.labels }}"

          buildah bud \
            --storage-driver=overlay \
            --storage-opt=overlay.mount_program=/usr/bin/fuse-overlayfs \
            --format=oci \
            "${LABEL_ARGS[@]}" \
            -t localhost/fluffy-pancake:base \
            -f ./Containerfile \
            .

      - name: 2. Rechunk via Chunkah (Rootless)
        if: github.event_name != 'pull_request'
        env:
          GENERATED_TAGS: ${{ steps.metadata.outputs.tags }}
        run: |
          CHUNKAH_CONFIG_STR="$(podman inspect localhost/fluffy-pancake:base)"
          # Chunkah ist hier bereits vorbildlich über seinen immutable SHA-256 Digest gepinnt!
          CHUNKAH_REF="quay.io/coreos/chunkah:v0.6.0@sha256:ff8b8b466a942ec6000445d4001fc661e2fc5a952ad9ee29b4de9ab09d1d1708"

          TAG_LIST=($GENERATED_TAGS)
          FIRST_TAG=${TAG_LIST[0]}

          echo "Starte Re-Chunking für Haupt-Tag: $FIRST_TAG"
          buildah build \
            --storage-driver=overlay \
            --storage-opt=overlay.mount_program=/usr/bin/fuse-overlayfs \
            --skip-unused-stages=false \
            --from localhost/fluffy-pancake:base \
            --build-arg "CHUNKAH=${CHUNKAH_REF}" \
            --build-arg "CHUNKAH_CONFIG_STR=${CHUNKAH_CONFIG_STR}" \
            --build-arg "CHUNKAH_ARGS=--max-layers 128 --prune /sysroot/ --label ostree.commit- --label ostree.final-diffid-" \
            -t "$FIRST_TAG" \
            -v "$(pwd):/run/src" \
            --security-opt=label=disable \
            ./Containerfile.splitter

          for tag in "${TAG_LIST[@]}"; do
            if [[ "$tag" != "$FIRST_TAG" ]]; then
              echo "Zusätzliches Tag setzen: $tag"
              buildah tag --storage-driver=overlay "$FIRST_TAG" "$tag"
            fi
          done

          rm -rf out

      - name: 3. Push OCI Images directly
        if: github.event_name != 'pull_request'
        env:
          GENERATED_TAGS: ${{ steps.metadata.outputs.tags }}
        run: |
          TAG_LIST=($GENERATED_TAGS)
          FIRST_TAG=${TAG_LIST[0]}

          echo "Pushe primäres Image und extrahiere Digest für Cosign..."
          buildah push \
            --storage-driver=overlay \
            --digestfile primary_digest.txt \
            "$FIRST_TAG"

          echo "IMAGE_DIGEST=$(cat primary_digest.txt)" >> ${GITHUB_ENV}

          for tag in "${TAG_LIST[@]}"; do
            if [[ "$tag" != "$FIRST_TAG" ]]; then
              echo "Pushe zusätzliches Tag: $tag"
              buildah push --storage-driver=overlay "$tag"
            fi
          done

      - name: Install Cosign
        if: github.event_name != 'pull_request'
        # Abgesichert: entspricht sigstore/cosign-installer@v3.8.1 (Stabile v3/v4-Basis)
        uses: sigstore/cosign-installer@V4.2.1

      - name: Sign container image
        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
        env:
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}
          COSIGN_PASSWORD: ""
        run: |
          echo "Signing image mit lokal extrahiertem Digest: ${{ env.IMAGE_DIGEST }}"
          cosign sign -y \
            --key env://COSIGN_PRIVATE_KEY \
            --use-signing-config=false \
            --new-bundle-format=false \
            --tlog-upload=false \
            --registry-referrers-mode=legacy \
            "${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${{ env.IMAGE_DIGEST }}"

      - name: Post-Build Cleanup
        if: always()
        run: |
          echo "Bereinige unprivilegierten Buildah-Storage..."
          buildah prune --storage-driver=overlay --force