---
name: build-ublue-custom
on:
  pull_request:
    branches:
      - main
  schedule:
    - cron: '05 10 * * *'  # 10:05am UTC everyday
  push:
    branches:
      - main
    paths-ignore:
      - '**/README.md'
  workflow_dispatch:

# The env variables starting with "ARG_" are described in the Containerfile of this repo.
# The values here are defaults and should be modified if using a different image, needing
# nvidia, a specific nvidia driver, or a different Fedora version.
env:
  MY_IMAGE_NAME: "custom-silverblue"  # the name of the image produced by this build
  ARG_SOURCE_IMAGE: "silverblue"  # see Containerfile for list of possible upstream images
  ARG_SOURCE_SUFFIX: "main"  # see Containerfile
  ARG_FEDORA_VERSION: "39"  # see Containerfile
  ARG_NVIDIA_VERSION: ""  # see Containerfile
  IMAGE_REGISTRY: "ghcr.io/${{ github.repository_owner }}"  # do not edit

jobs:
  push-ghcr:
    name: Build and push image
    runs-on: ubuntu-22.04

    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@v3

      - name: Generate tags
        id: generate-tags
        shell: bash
        run: |
          # Generate a timestamp for creating an image version history
          TIMESTAMP="$(date +%Y%m%d)"
          VARIANT="${{ env.ARG_FEDORA_VERSION }}"

          COMMIT_TAGS=()
          BUILD_TAGS=()

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

          COMMIT_TAGS+=("pr-${{ github.event.number }}")
          COMMIT_TAGS+=("${SHA_SHORT}")

          BUILD_TAGS=("${VARIANT}")

          # 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+=("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

      - name: Get current version
        id: labels
        run: |
          ver=$(skopeo inspect docker://ghcr.io/ublue-os/${{ env.ARG_SOURCE_IMAGE }}-${{ env.ARG_SOURCE_SUFFIX }}:${{ env.ARG_FEDORA_VERSION }}${{ env.ARG_NVIDIA_VERSION }} | jq -r '.Labels["org.opencontainers.image.version"]')
          echo "VERSION=$ver" >> $GITHUB_OUTPUT

      # Build metadata
      - name: Image Metadata
        uses: docker/metadata-action@v4
        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=Customized ${{ env.ARG_SOURCE_IMAGE }}-${{ env.ARG_SOURCE_SUFFIX }}
            org.opencontainers.image.title=${{ env.MY_IMAGE_NAME }}
            org.opencontainers.image.version=${{ steps.labels.outputs.VERSION }}

      # Build image using Buildah action
      - name: Build Image
        id: build_image
        uses: redhat-actions/buildah-build@v2
        with:
          containerfiles: |
            ./Containerfile
          # Postfix image name with -custom to make it a little more descriptive
          # Syntax: https://docs.github.com/en/actions/learn-github-actions/expressions#format
          image: ${{ env.MY_IMAGE_NAME }}
          tags: |
            ${{ steps.generate-tags.outputs.alias_tags }}
          build-args: |
            SOURCE_IMAGE=${{ env.ARG_SOURCE_IMAGE }}
            SOURCE_SUFFIX=${{ env.ARG_SOURCE_SUFFIX }}
            FEDORA_VERSION=${{ env.ARG_FEDORA_VERSION }}
            NVIDIA_VERSION=${{ env.ARG_NVIDIA_VERSION }}
          labels: ${{ steps.meta.outputs.labels }}
          oci: false

      # 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@v5
        with:
          string: ${{ env.IMAGE_REGISTRY }}

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v2
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      # Push the image to GHCR (Image Registry)
      - name: Push To GHCR
        uses: redhat-actions/push-to-registry@v2
        id: push
        env:
          REGISTRY_USER: ${{ github.actor }}
          REGISTRY_PASSWORD: ${{ github.token }}
        with:
          image: ${{ steps.build_image.outputs.image }}
          tags: ${{ steps.build_image.outputs.tags }}
          registry: ${{ steps.registry_case.outputs.lowercase }}
          username: ${{ env.REGISTRY_USER }}
          password: ${{ env.REGISTRY_PASSWORD }}
          extra-args: |
            --disable-content-trust

      # 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@v3.4.0
      #  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 ${{ steps.registry_case.outputs.lowercase }}/${{ steps.build_image.outputs.image }}@${TAGS}
      #  env:
      #    TAGS: ${{ steps.push.outputs.digest }}
      #    COSIGN_EXPERIMENTAL: false
      #    COSIGN_PRIVATE_KEY: ${{ secrets.SIGNING_SECRET }}