infrastructure/nixos/cross/aarch64.nix

{
  pkgs,
  config,
  lib,
  ...
}: let
  inherit (lib.options) mkEnableOption mkPackageOption;
  inherit (lib.modules) mkIf;
  cfg = config.boot.binfmt.cross.aarch64;
in {
  options = {
    boot.binfmt.cross.aarch64 = {
      enable =
        mkEnableOption "qemu-aarch64"
        // {
          default = true;
        };
      package = mkPackageOption pkgs "qemu" {};
      armv7l = mkEnableOption "arm.cachix.org";
    };
  };

  config = {
    boot.binfmt = {
      emulatedSystems = mkIf cfg.enable ["aarch64-linux"];
      registrations.aarch64-linux = mkIf cfg.enable {
        interpreter = "${cfg.package}/bin/qemu-aarch64";
        wrapInterpreterInShell = false;
      };
    };

    nix.settings = mkIf cfg.armv7l {
      substituters = ["https://arm.cachix.org/"];
      trusted-public-keys = ["arm.cachix.org-1:5BZ2kjoL1q6nWhlnrbAl+G7ThY7+HaBRD9PZzqZkbnM="];
    };
  };
}