home/hosts/meili/nix-builder.nix

# NOTE: use `sudo launchctl stop org.nixos.linux-builder` to stop VM
{ lib, ... }:

let
  systems = [
    "aarch64-linux"
    "x86_64-linux"
  ];
in

{
  nix.linux-builder = {
    enable = true;
    ephemeral = true;
    maxJobs = 4;

    inherit systems;

    supportedFeatures = [
      "kvm"
      "benchmark"
      "big-parallel"
      "nixos-test"
    ];

    config = {
      # Enable x86_64 emulation
      boot.binfmt.emulatedSystems = [ "x86_64-linux" ];

      virtualisation = {
        darwin-builder = {
          diskSize = 50 * 1024;
          memorySize = 8 * 1024;
        };
        cores = 6;
        msize = 128 * 1024;
      };
    };
  };

  nix.settings.extra-platforms = systems;
  nix.settings.system-features = [
    "nixos-test"
    "apple-virt"
    "benchmark"
    "big-parallel"
    "kvm"
  ];

  # Keep your logs! They are vital when the VM fails to boot.
  launchd.daemons.linux-builder = {
    serviceConfig = {
      StandardOutPath = "/var/log/darwin-builder.log";
      StandardErrorPath = "/var/log/darwin-builder.log";
      KeepAlive = lib.mkForce false;
    };
  };
}