name: build and cache packages
on:
  workflow_dispatch:
    inputs:
      package:
        description: "package to build"
        required: false
        type: string
jobs:
  build-packages:
    strategy:
      matrix:
        package:
          - github:cything/nixpkgs/928e0c6874ab3e759305e93f806a4cf559645677#alvr
          - github:cything/nixpkgs/8929e1256ceec677dd57fce405cdaca23176399b#lact
          - ${{ inputs.package }}
        os:
          - ubuntu-latest
          - macos-latest
          - ubuntu-24.04-arm
    runs-on: ${{ matrix.os }}
    continue-on-error: true
    steps:
      - name: Install Nix
        uses: cachix/install-nix-action@v30
      - name: Sync repository
        uses: actions/checkout@v4
        with:
          install_url: https://releases.nixos.org/nix/nix-2.25.4/install
          extra_nix_config: 'accept-flake-config = true'
      - uses: cachix/cachix-action@v14
        with:
          name: cything
          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
          useDaemon: false
          installCommand: nix profile install nixpkgs#cachix
      - name: Setup Attic cache
        uses: ryanccn/attic-action@v0
        with:
          endpoint: ${{ vars.ATTIC_ENDPOINT }}
          cache: ${{ vars.ATTIC_CACHE }}
          token: ${{ secrets.ATTIC_TOKEN }}
      - name: Restore and cache Nix store
        uses: nix-community/cache-nix-action@v5.1.0
        with:
          # restore and save a cache using this key
          primary-key: nix-${{ runner.os }}-${{ matrix.package }}-${{ hashFiles('**/*.nix', 'flake.lock') }}
          # if there's no cache hit, restore a cache by this prefix
          restore-prefixes-first-match: nix-${{ runner.os }}-${{ matrix.package }}-
          # do purge caches
          purge: true
          # purge all versions of the cache
          purge-prefixes: nix-${{ runner.os }}-
          # created more than this number of seconds ago relative to the start of the `Post Restore` phase
          purge-last-accessed: 86400
          # except the version with the `primary-key`, if it exists
          purge-primary-key: never
          # always save the cache
          save-always: true
      - run: nix build -L ${{ matrix.package }}
      - uses: actions/upload-artifact@v4
        with:
          name: ${{ matrix.package }}-${{ matrix.os }}
          path: result/