hydra/t/jobs/runcommand-dynamic.nix

with import ./config.nix;
{
  runCommandHook.example = mkDerivation
    {
      name = "my-build-product";
      builder = "/bin/sh";
      outputs = [ "out" "bin" ];
      args = [
        (
          builtins.toFile "builder.sh" ''
            #! /bin/sh

            echo "$PATH"

            mkdir $bin
            echo "foo" > $bin/bar

            metrics=$out/nix-support/hydra-metrics
            mkdir -p "$(dirname "$metrics")"
            echo "lineCoverage 18 %" >> "$metrics"
            echo "maxResident 27 KiB" >> "$metrics"
          ''
        )
      ];
    };

}