nix.yml

name: "Nix Housekeeping"

on:
  push:
    branches:
      - master
  workflow_dispatch: {}

jobs:
  cache-dev-shell:
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - name: 📥 Clone repository
        uses: actions/checkout@v6
        with:
          repository: ${{ inputs.checkout_repo || github.repository }}
          ref: ${{ inputs.checkout_ref || '' }}

      - name: ❄ Install Nix
        uses: DeterminateSystems/nix-installer-action@main
        with:
          extra-conf: |
            extra-substituters = https://graphite.cachix.org https://graphite-dev.cachix.org
            extra-trusted-public-keys = graphite.cachix.org-1:B7Il1yMpkquN/dXM+5GRmz+4Xmu2aaCS1GcWNfFhsOo= graphite-dev.cachix.org-1:RppXYpiV1qO2TYKTkXXGHsAEQDOB5G51b3VlrN9QmbI=

      - name: 🔎 Check whether development shell is already in binary cache
        id: cache-check
        run: |
          out_path="$(nix eval --raw .#devShells.x86_64-linux.default.outPath)"
          if nix path-info --store https://graphite-dev.cachix.org "$out_path" &>/dev/null; then
            echo "cached=true" >> "$GITHUB_OUTPUT"
            echo "Development shell is already cached at $out_path"
          else
            echo "cached=false" >> "$GITHUB_OUTPUT"
            echo "Development shell is not cached"
          fi

      - name: 📦 Build Nix development shell
        if: steps.cache-check.outputs.cached == 'false'
        run: nix build .#devShells.x86_64-linux.default --no-link --print-out-paths

      - name: 📤 Push Nix development shell to binary cache
        if: steps.cache-check.outputs.cached == 'false'
        env:
          NIX_CACHE_AUTH_TOKEN: ${{ secrets.NIX_CACHE_AUTH_TOKEN_DEV }}
        run: |
          nix run nixpkgs#cachix -- authtoken $NIX_CACHE_AUTH_TOKEN
          nix build .#devShells.x86_64-linux.default --no-link --print-out-paths | nix run nixpkgs#cachix -- push graphite-dev