name: Vib Build

on:
  push:
    branches: [ "main" ]
    tags:
      - '*'
  schedule:
    - cron: '21 */6 * * *'
  pull_request:
  workflow_dispatch:

env:
  CUSTOM_IMAGE_NAME: custom
  BUILDX_NO_DEFAULT_ATTESTATIONS: 1

jobs:
  verify_image:
    runs-on: ubuntu-latest
    steps:
    - name: Checkout code
      uses: actions/checkout@v4

    - name: Install dependencies
      run: sudo apt-get install -y libfyaml-utils

    - name: Read base image name from recipe
      id: read_base_recipe
      run: |
        BASE_IMAGE="$(fy-filter -f recipe.yml /stages/-1/base)"
        echo The base image is $BASE_IMAGE
        if [ -z $BASE_IMAGE ]; then exit 1; fi
        echo "base_image=$BASE_IMAGE" >> "$GITHUB_OUTPUT"
        echo "BASE_IMAGE=$BASE_IMAGE" >> "$GITHUB_ENV"

    - name: Verify Base Image Integrity
      run: |
        gh attestation verify oci://ghcr.io/${{ env.BASE_IMAGE }} --owner Vanilla-OS
      env:
        GH_TOKEN: ${{ github.token }}

  check_update:
    runs-on: ubuntu-latest

    outputs:
      has_updates: ${{ steps.set_output.outputs.has_updates }}
      base_image: ${{ steps.read_base_recipe.outputs.base_image }}

    permissions:
      contents: write # Allow actions to create a digest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Install dependencies
        run: sudo apt-get install -y jq skopeo libfyaml-utils

      - name: Read base image name from recipe
        id: read_base_recipe
        run: |
          BASE_IMAGE="$(fy-filter -f recipe.yml /stages/-1/base)"
          echo The base image is $BASE_IMAGE
          if [ -z $BASE_IMAGE ]; then exit 1; fi
          echo "base_image=$BASE_IMAGE" >> "$GITHUB_OUTPUT"
          echo "BASE_IMAGE=$BASE_IMAGE" >> "$GITHUB_ENV"

      - name: Get last successful run
        if: ${{ github.ref_type == 'branch' }}
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        continue-on-error: true
        run: |
          gh run list -b "${{ github.ref_name }}" -w "${{ github.workflow }}" -s "success" -L 1 --json databaseId > last_run.json
          echo "LAST_RUN_ID=$(jq -r '.[0].databaseId' last_run.json)" >> "$GITHUB_ENV"

      - name: Download the previous digest
        uses: actions/download-artifact@v4
        continue-on-error: true
        with:
          name: digest
          github-token: ${{ github.token }}
          run-id: ${{ env.LAST_RUN_ID }}

      - name: Check if there was an update to the base image
        run: |
          touch digest.txt
          mv digest.txt last_digest.txt
          skopeo inspect --raw docker://${{ env.BASE_IMAGE }} | sha256sum > digest.txt
          echo Old digest is: $(cat last_digest.txt)
          echo New digest is: $(cat digest.txt)
          echo "HAS_UPDATES=$(cmp -s digest.txt last_digest.txt; echo $?)" >> "$GITHUB_ENV"

      - name: Upload current digest
        uses: actions/upload-artifact@v4
        with:
          name: digest
          path: digest.txt

      - name: Set output
        id: set_output
        run: |
          if [ ${{ github.event_name == 'schedule'}} == false ]
          then
            echo action was manually run, updating either way
            echo "has_updates=true" >> "$GITHUB_OUTPUT"
          elif [ ${{ env.HAS_UPDATES }} == 1 ]
          then
            echo base image was updated since the last build
            echo "has_updates=true" >> "$GITHUB_OUTPUT"
          else
            echo no updates to the base image since the last build
            echo "has_updates=false" >> "$GITHUB_OUTPUT"
          fi

  build:
    runs-on: ubuntu-latest
    needs: [check_update, verify_image]
    if: ${{ needs.check_update.outputs.has_updates == 'true' }}

    permissions:
      packages: write # Allow pushing images to GHCR
      attestations: write # To create and write attestations
      id-token: write # Additional permissions for the persistence of the attestations

    steps:
    - uses: actions/checkout@v4

    - uses: vanilla-os/vib-gh-action@v0.8.1
      with:
        recipe: 'recipe.yml'
        plugins: 'Vanilla-OS/vib-fsguard:v1.5.3'

    - uses: actions/upload-artifact@v4
      with:
        name: Containerfile
        path: Containerfile

    - name: Generate image name
      run: |
        REPO_OWNER_LOWERCASE="$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')"
        echo "REPO_OWNER_LOWERCASE=$REPO_OWNER_LOWERCASE">> "$GITHUB_ENV"
        echo "IMAGE_URL=ghcr.io/$REPO_OWNER_LOWERCASE/${{ env.CUSTOM_IMAGE_NAME }}">> "$GITHUB_ENV"

    - name: Set image info
      run: |
        echo -n "${{ needs.check_update.outputs.base_image }}" > ./includes.container/image-info/base-image-name
        echo -n "${{ env.REPO_OWNER_LOWERCASE }}/${{ env.CUSTOM_IMAGE_NAME }}" > ./includes.container/image-info/image-name

    - name: Docker meta
      id: docker_meta
      uses: docker/metadata-action@v5
      with:
        images: |
          ${{ env. IMAGE_URL }}
        tags: |
          type=semver,pattern={{version}}
          type=semver,pattern={{major}}.{{minor}}
          type=semver,pattern={{raw}}
          type=semver,pattern=v{{major}}
          type=ref,event=branch

    - name: Set up Docker Buildx
      uses: docker/setup-buildx-action@v3

    - name: Login to GitHub Package Registry
      uses: docker/login-action@v3
      if: ${{ github.event_name != 'pull_request' }}
      with:
        registry: ghcr.io
        username: ${{ github.repository_owner }}
        password: ${{ secrets.GITHUB_TOKEN }}

    - name: Build and Push the Docker image
      id: push
      uses: docker/build-push-action@v6
      with:
        context: .
        file: Containerfile
        push: ${{ github.event_name != 'pull_request' }}
        tags: ${{ steps.docker_meta.outputs.tags }}
        labels: ${{ steps.docker_meta.outputs.labels }}
        cache-from: type=gha
        cache-to: type=gha,mode=max
        platforms: linux/amd64
        provenance: false

    - name: Attest pushed image
      uses: actions/attest-build-provenance@v1
      id: attest
      if: ${{ github.event_name != 'pull_request' }}
      with:
        subject-name: ${{ env.IMAGE_URL }}
        subject-digest: ${{ steps.push.outputs.digest }}
        push-to-registry: false