build.yml

# TODO Remove when I can be arsed to fix the hydra server
name: "Build"
on: { push: { branches: [ "main" ] } }
jobs:
  nix-build:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v4
    - uses: cachix/install-nix-action@v25
    - uses: cachix/cachix-action@v14
      with:
        name: npp
        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
    - uses: nixbuild/nixbuild-action@v19
      with:
        nixbuild_token: ${{ secrets.NIXBUILD_NET_AUTH_TOKEN }}

    # Evaluating things one by one like this is slower but also does not require ungodly amounts of memory
    - run: |
        set -euo pipefail

        # shellcheck disable=SC2016
        nix eval --impure .#hydraJobs --apply '
          hydraJobs:
          let
            flatten = x:
              if builtins.isList x then
                builtins.concatMap flatten x
              else
                [ x ]
            ;

            recurse = set: builtins.map (x: x.path) (flatten (recurse'"'"' [ ] set));
            recurse'"'"' = path: set:
              if set.type or "" == "derivation" then
                { inherit path; }
              else
                builtins.map (name: recurse'"'"' (path ++ [ name ]) set.${name}) (builtins.attrNames set)
            ;

          in
          recurse hydraJobs
        ' --json \
        | nix run nixpkgs#jq -- --raw-output0 '.[] | map("\"" + . + "\"") | join(".")' \
        | xargs -tr0I{} nix -L build --impure --keep-going .#hydraJobs.{} -o result-{}