build-image.yml

name: build-dpea-pi-image

on:
  workflow_dispatch:
  push:
    branches: [main]
    paths:
      - packages.txt
      - customize.sh
      - files/**
      - build-image.sh
      - .github/workflows/**

permissions:
  contents: write

jobs:
  build:
    runs-on: ubuntu-24.04-arm
    steps:
      - uses: actions/checkout@v4

      - name: Free disk + install tools
        run: |
          sudo rm -rf /usr/local/lib/android /usr/share/dotnet /opt/ghc /usr/local/.ghcup
          df -h
          sudo apt-get update
          sudo apt-get install -y xz-utils parted e2fsprogs curl

      - name: Build image
        run: sudo -E ./build-image.sh

      - name: Generate Imager OS list
        run: |
          set -euo pipefail
          sudo chown -R "$(id -u):$(id -g)" .build   # build-image.sh ran as root
          . .build/image-meta.env
          TAG="dpea-pi-$(date +%Y%m%d-%H%M)"
          IMG_URL="https://github.com/${GITHUB_REPOSITORY}/releases/download/${TAG}/${IMG_FILE}"
          # init_format enables Imager's Customisation panel.
          jq -n \
            --arg url "$IMG_URL" \
            --arg date "$(date +%Y-%m-%d)" \
            --arg sha "$EXTRACT_SHA256" \
            --argjson esize "$EXTRACT_SIZE" \
            --argjson dsize "$IMAGE_DOWNLOAD_SIZE" \
            '{os_list: [ {
               name: "DPEA Pi",
               description: "DPEA exhibit base image (Raspberry Pi OS Trixie 64-bit + DPEA config)",
               url: $url,
               release_date: $date,
               init_format: "systemd",
               extract_size: $esize,
               extract_sha256: $sha,
               image_download_size: $dsize
             } ] }' > .build/os-list.json
          jq . .build/os-list.json > /dev/null && echo "os-list.json is valid JSON"
          echo "TAG=$TAG"           >> "$GITHUB_ENV"
          echo "IMG_FILE=$IMG_FILE" >> "$GITHUB_ENV"

      - name: Publish latest Release
        if: github.event_name != 'pull_request'
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          set -euo pipefail
          gh release create "$TAG" ".build/${IMG_FILE}" .build/os-list.json \
            --repo "$GITHUB_REPOSITORY" --title "$TAG" \
            --notes "Auto-built DPEA Pi image from ${GITHUB_SHA::7}" --latest