nixcfg/machines/manager/netinstall/installer.nix

{ pkgs, lib, config, modulesPath, manangerConfig, ... }:

with lib;

let
  auto-install = pkgs.writeShellScript "nixos-install" ''
    if [[ "$(cat /proc/cmdline)" =~ nixos\.install=([^ ]+) ]]; then
      INSTALL="''${BASH_REMATCH[1]}"
    else
      echo "No install derivation found" >&2
      exit 1
    fi
  '';
in
{
  imports = [
    "${modulesPath}/installer/netboot/netboot-minimal.nix"
  ];

  config = {
    services.getty.autologinUser = lib.mkForce "root";

    networking.hostName = "installer";
    networking.hosts = mkForce manangerConfig.networking.hosts;

    users.users."root" = mkForce manangerConfig.users.users."root";

    systemd.services."auto-install" = {
      description = "Automated NixOS installer";

      wants = [ "network-online.target" ];
      after = [ "network-online.target" ];

      wantedBy = [ "multi-user.target" ];

      unitConfig = {
        AssertKernelCommandLine = "nixos.install";

        FailureAction = "reboot-force";
      };

      serviceConfig = {
        Type = "oneshot";

        ExecStart = auto-install;

        StandardInput = "tty-force";
        TTYPath = "/dev/tty1";
        TTYVTDisallocate = false;
      };
    };

    nix.settings = {
      substituters = [
        "http://cache.${manangerConfig.networking.domain}"
      ];
      trusted-public-keys = [
        (fileContents manangerConfig.gather.parts."cache/key".path)
      ];
    };

    system.stateVersion = config.system.nixos.release;
  };
}