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: "${{ github.event.repository.name }}"
  IMAGE_REGISTRY: "humocs-man.duckdns.org/${{ github.repository_owner }}"
  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: |
          echo "IMAGE_REGISTRY=${IMAGE_REGISTRY,,}" >> ${GITHUB_ENV}
          echo "IMAGE_NAME=${IMAGE_NAME,,}" >> ${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
        uses: actions/checkout@v4

      - name: Image Metadata
        uses: docker/metadata-action@v5
        id: metadata
        with:
          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.title=${{ env.IMAGE_NAME }}
            org.opencontainers.image.vendor=${{ github.repository_owner }}
            org.opencontainers.image.version=${{ env.IMAGE_TAG }}.{{date 'YYYYMMDD'}}
            containers.bootc=1
            ostree.bootable=1
          sep-tags: " "
          sep-annotations: " "

      - name: Cache buildah layers
        uses: actions/cache@v4
        with:
          path: |
            ~/.cache/buildah
            /tmp/.buildah-cache
          key: ${{ runner.os }}-${{ github.workflow }}-${{ hashFiles('Containerfile', 'build/**', 'configs/**', 'scripts/**') }}-${{ github.ref }}
          restore-keys: |
            ${{ runner.os }}-${{ github.workflow }}-${{ hashFiles('Containerfile', 'build/**', 'configs/**', 'scripts/**') }}-
            ${{ runner.os }}-${{ github.workflow }}-

      - name: Build Image
        id: build_image
        uses: redhat-actions/buildah-build@v2
        with:
          containerfiles: |
            ./Containerfile
          image: ${{ env.IMAGE_NAME }}
          tags: ${{ env.IMAGE_TAG }}
          labels: ${{ steps.metadata.outputs.labels }}
          oci: true

      - name: Rechunk with chunkah
        run: |
          set -euo pipefail

          IMG="localhost/${{ env.IMAGE_NAME }}:${{ env.IMAGE_TAG }}"
          CHUNKED_IMG="localhost/${{ env.IMAGE_NAME }}-chunked:${{ env.IMAGE_TAG }}"

          CONFIG=$(buildah inspect "$IMG" | jq -c .)
          sudo rm -rf /tmp/.buildah-cache/* 2>/dev/null || true

          CHUNKAH_CF=$(mktemp)
          curl -sL https://github.com/coreos/chunkah/releases/download/v0.5.0/Containerfile.splitter -o "$CHUNKAH_CF"

          buildah build --skip-unused-stages=false \
            -f "$CHUNKAH_CF" \
            --from "$IMG" \
            --build-arg CHUNKAH_CONFIG_STR="$CONFIG" \
            --build-arg "CHUNKAH_ARGS=--prune /sysroot/ --max-layers 128 --compressed --label ostree.commit- --label ostree.final-diffid- --label ostree.bootable=true --label containers.bootc=1" \
            -t "$CHUNKED_IMG" \
            .

          rm -f "$CHUNKAH_CF" out.ociarchive
          buildah rmi "$IMG"

          for full_tag in ${{ steps.metadata.outputs.tags }}; do
            tag_only="${full_tag##*:}"
            buildah tag "$CHUNKED_IMG" "localhost/${{ env.IMAGE_NAME }}:${tag_only}"
          done
          buildah rmi "$CHUNKED_IMG"

      - name: Login to Gitea Container Registry
        uses: docker/login-action@v3
        if: github.event_name != 'pull_request'
        with:
          registry: humocs-man.duckdns.org
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Push to Gitea Registry
        id: push
        if: github.event_name != 'pull_request'
        uses: redhat-actions/push-to-registry@v2
        with:
          image: ${{ env.IMAGE_NAME }}
          tags: ${{ steps.metadata.outputs.tags }}
          registry: ${{ env.IMAGE_REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Install Cosign
        uses: sigstore/cosign-installer@v3
        if: github.event_name != 'pull_request'

      - name: Sign container image
        if: github.event_name != 'pull_request' && env.IS_TEST_BUILD == 'false'
        run: |
          cosign sign -y --tlog-upload=false --key env://COSIGN_PRIVATE_KEY "${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}@${{ steps.push.outputs.digest }}"
        env:
          COSIGN_EXPERIMENTAL: false
          COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}