update.yml

name: "index-generate"
on:
  workflow_dispatch:
  schedule:
    # every sunday at 2:51
    - cron:  '51 2 * * 0'
jobs:
  index:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        include:
          - os: ubuntu-latest
            indexName: x86_64-linux
          # - os: macos-latest
          #   indexName: x86_64-darwin
    name: Build database
    steps:
    - uses: actions/checkout@v3
    - uses: cachix/install-nix-action@v21
      with:
        nix_path: nixpkgs=https://github.com/NixOS/nixpkgs/archive/release-23.11.tar.gz
    - name: run nix-index
      run: nix-shell -p nix-index --command "nix-index --db ./${{ matrix.indexName }}-index 2>&1 | grep -v '+ generating index'"
    - name: upload artifact
      uses: actions/upload-artifact@v3
      with:
        name: ${{ matrix.indexName }}
        path: ./${{ matrix.indexName }}-index

  upload-index:
    runs-on: ubuntu-latest
    needs: index
    steps:
    - name: download linux artifact
      uses: actions/download-artifact@v3
      with:
        name: x86_64-linux
        path: linux-index
    - run: mv linux-index/files index-x86_64-linux
    # - name: download darwin artifact
    #   uses: actions/download-artifact@v3
    #   with:
    #     name: x86_64-darwin
    #     path: darwin-index
    # - run: mv darwin-index/files index-x86_64-darwin
    - name: Get current date
      id: date
      run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
    - name: Create Release
      id: create_release
      uses: softprops/action-gh-release@v1
      env:
        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      with:
        name: Release ${{ steps.date.outputs.date }}
        tag_name: ${{ steps.date.outputs.date }}
        # files: |
        #   index-x86_64-linux
        #   index-x86_64-darwin
        files: |
          index-x86_64-linux

  update-flake:
    runs-on: ubuntu-latest
    needs: upload-index
    steps:
    - uses: actions/checkout@v3
    - uses: cachix/install-nix-action@v21
    - name: Get current date
      id: date
      run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
    - name: prefetch linux index
      id: prefetch-linux
      run: echo "::set-output name=hash::$(nix shell nixpkgs#nix-prefetch -c nix-prefetch-url https://github.com/${{ github.repository }}/releases/download/${{ steps.date.outputs.date }}/index-x86_64-linux)"
    # - name: prefetch darwin index
    #   id: prefetch-darwin
    #   run: echo "::set-output name=hash::$(nix shell nixpkgs#nix-prefetch -c nix-prefetch-url https://github.com/${{ github.repository }}/releases/download/${{ steps.date.outputs.date }}/index-x86_64-darwin)"
    - name: overwrite flake.nix
      # run: |
      #   cat > flake.nix << EOF
      #   # this file is autogenerated by .github/workflows/update.yml
      #   {
      #     description = "nix-index database";
      #     outputs = _:
      #       {
      #         legacyPackages.x86_64-linux.database = builtins.fetchurl {
      #           url = "https://github.com/${{ github.repository }}/releases/download/${{ steps.date.outputs.date }}/index-x86_64-linux";
      #           sha256 = "${{ steps.prefetch-linux.outputs.hash }}";
      #         };
      #         legacyPackages.x86_64-darwin.database = builtins.fetchurl {
      #           url = "https://github.com/${{ github.repository }}/releases/download/${{ steps.date.outputs.date }}/index-x86_64-darwin";
      #           sha256 = "${{ steps.prefetch-darwin.outputs.hash }}";
      #         };
      #       };
      #   }
      #   EOF
      run: |
        cat > flake.nix << EOF
        # this file is autogenerated by .github/workflows/update.yml
        {
          description = "nix-index database for NixOS stable";
          outputs = _:
            {
              legacyPackages.x86_64-linux.database = builtins.fetchurl {
                url = "https://github.com/${{ github.repository }}/releases/download/${{ steps.date.outputs.date }}/index-x86_64-linux";
                sha256 = "${{ steps.prefetch-linux.outputs.hash }}";
              };
            };
        }
        EOF
    - name: commit and push flake.nix, if it changed
      run: |
        if [[ "$(git status --porcelain)" != "" ]]; then
          git config --local user.email "github-actions[bot]@users.noreply.github.com"
          git config --local user.name "github-actions[bot]"
          git add flake.nix
          git commit -m "update flake.nix to release ${{ steps.date.outputs.date }}"
          git push origin HEAD:main
        fi