name: Build NixOS iso

on:
  schedule:
    - cron: "0 10 * * 2"
  workflow_dispatch:

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        target: [
          live-gnome-unstable
        ]
    steps:
      - uses: actions/checkout@v3

      - name: Cache date
        run: echo "DATE=$(date +'%Y-%m-%d %H:%M:%S')" >> $GITHUB_ENV

      - name: Filename friendly date
        run: echo "BUILD_DATE=$(echo $DATE | sed -r -e 's/:/./g' -e 's/ /_/g')" >> $GITHUB_ENV

      - name: Store branch name
        run: echo "BUILD_BRANCH=${GITHUB_REF##*/}" >> $GITHUB_ENV

      - name: Store commit hash
        run: echo "BUILD_COMMIT=$(git rev-parse --short $GITHUB_SHA)" >> $GITHUB_ENV

      - name: Generate output name
        run: echo "NAME=${BUILD_DATE}_${BUILD_BRANCH}_${BUILD_COMMIT}_nixos_iso_${{ matrix.target }}" >> $GITHUB_ENV

      - name: Install Nix
        uses: cachix/install-nix-action@v20

      - name: Check flake
        uses: workflow/nix-shell-action@v3.2.1
        with:
          script: nix flake check .

      - name: Build image
        uses: workflow/nix-shell-action@v3.2.1
        with:
          script: nix build .#nixosConfigurations.${{ matrix.target }}.config.system.build.isoImage

      - name: Optimize nix store
        uses: workflow/nix-shell-action@v3.2.1
        with:
          script: nix store optimise

      - name: Upload iso
        uses: actions/upload-artifact@v3.1.2
        with:
          name: ${{ env.NAME }}
          path: result/iso/*.iso