nix-config/nixos/hosts/trantor/default.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, stablePkgs, ... }:

let home = "/home/rilla";
in {
  imports = [
    ./hardware-configuration/trantor.nix
    ../../modules/common
    ../../modules/common/desktop.nix
  ];

  home-manager.users.rilla.imports = [
    ../../../home/hosts/trantor.nix
  ];

  fileSystems = {

    "/" = {
      device = "tmpfs";
      fsType = "tmpfs";
      options = [ "defaults" "size=2G" "mode=755" ];
    };

    "/boot/efi" = {
      device = "/dev/disk/by-uuid/0BFA-9A66";
      fsType = "vfat";
    };

    "/mnt/btr_system" = {
      device = "/dev/mapper/system";
      fsType = "btrfs";
      options = [ "subvolid=5" "compress=zstd" ];
    };

    "/mnt/btr_user" = {
      device = "/dev/mapper/user";
      fsType = "btrfs";
      options = [ "subvolid=5" "compress=zstd" ];
    };

    "/mnt/persist" = {
      device = "/dev/mapper/user";
      fsType = "btrfs";
      options = [ "subvol=persist" "compress=zstd" ];
      neededForBoot = true;
    };

    "/mnt/data" = {
      device = "/dev/mapper/user";
      fsType = "btrfs";
      options = [ "subvol=data" "compress=zstd" ];
      neededForBoot = true;
    };

    "/mnt/vfs_share" = {
      device = "/dev/mapper/user";
      fsType = "btrfs";
      options = [ "subvol=vfs_share" "compress=zstd" ];
      neededForBoot = true;
    };

    "/nix" = {
      device = "/dev/mapper/system";
      fsType = "btrfs";
      options = [ "subvol=nix" "compress=zstd" ];
    };

    "/mnt/logs" = {
      device = "/dev/mapper/system";
      fsType = "btrfs";
      options = [ "subvol=logs" "compress=zstd" ];
      neededForBoot = true;
    };

    "/boot" = {
      device = "/dev/mapper/system";
      fsType = "btrfs";
      options = [ "subvol=boot" "compress=zstd" ];
    };

    "/swap" = {
      device = "/dev/mapper/system";
      fsType = "btrfs";
      options = [ "subvol=swap" ];
    };

    "/mnt/narwhal" = {
      device = "narwhal:/";
      fsType = "nfs";
    };

    "/mnt/backups/0" = {
      device = "/dev/mapper/backups0";
      fsType = "btrfs";
      options = [ "noauto" "subvolid=5" "compress=zstd" ];
    };

    "/mnt/backups/1" = {
      device = "/dev/mapper/backups1";
      fsType = "btrfs";
      options = [ "noauto" "subvolid=5" "compress=zstd" ];
    };

    "/mnt/backups/2" = {
      device = "/dev/mapper/backups2";
      fsType = "btrfs";
      options = [ "noauto" "subvolid=5" "compress=zstd" ];
    };

  };

  swapDevices = [{ device = "/swap/swapfile"; }];

  environment.etc = {
    crypttab = {
      text = ''
        backups0 UUID="e45232d5-f46f-46f3-a150-be26374b3357" /etc/luks-keys/backups.bin noauto
        backups1 UUID="5b3da928-4862-4451-89cd-5bd6a95466d0" /etc/luks-keys/backups.bin noauto
        backups2 UUID="cbfa9cba-dee2-4d0b-8cde-2f1d1849b22c" /etc/luks-keys/backups.bin noauto
      '';
    };
  };

  environment.variables = {
    NIXOS_CONFIG = "${home}/configs/nix-config/trantor.nix";
    LV2_PATH =
      "${home}/.nix-profile/lib/lv2:${home}/Audio/plugins/lv2:/run/current-system/sw/lib/lv2";
    LXVST_PATH =
      "${home}/.nix-profile/lib/lxvst:${home}/Audio/plugins/lxvst:/run/current-system/sw/lib/lxvst";
    LADSPA_PATH =
      "${home}/.nix-profile/lib/ladspa:${home}/Audio/plugins/ladspa:/run/current-system/sw/lib/ladspa";
  };

  networking.networkmanager.wifi.macAddress = "80:FA:5B:41:12:0F";

  nixpkgs.config.allowUnfree = true;
  programs.steam.enable = true;

  boot = {
    loader = {
      efi = {
        canTouchEfiVariables = true;
        efiSysMountPoint = "/boot/efi";
      };
      grub = {
        enable = true;
        device = "nodev";
        enableCryptodisk = true;
        efiSupport = true;
      };
    };
    initrd = {
      luks = {
        #yubikeySupport = true;
        devices = {
          "system" = {
            device = "/dev/disk/by-uuid/b9778e01-a86c-4c6b-beb3-f97888d4a6eb";
            keyFile = "/system_keyfile.bin";
            allowDiscards = true;
            # yubikey = {
            #   slot = 2;
            #   twoFactor = false;
            #   gracePeriod = 30;
            #   keyLength = 64;
            #   saltLength = 16;
            #   storage = {
            #     device = "/dev/nvme0n1p1";
            #     fsType = "vfat";
            #     path = "/crypt-storage/default";
            #   };
            # };
          };
          "user" = {
            device = "/dev/disk/by-uuid/d8e9b35d-704a-4f66-bc19-0dd3e158de36";
            keyFile = "/user_keyfile.bin";
          };
        };
      };
      secrets = {
        "/system_keyfile.bin" = "/etc/luks-keys/system.bin";
        "/user_keyfile.bin" = "/etc/luks-keys/user.bin";
      };
    };
  };

  # todo: target and/or archive
  services.btrbk = {
    sshAccess = [{
      roles = [ "info" "source" "target" "delete" "snapshot" "send" "receive" ];
      key =
        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAJy2lSOeG4iCUlk+W0TK9DnJyHe/0XUU0PD0kokbWKF btrbk";
    }];
    instances.btrbk = {
      onCalendar = "*:0/30"; # every 30 minutes
      settings = {
        snapshot_preserve = "2d";
        snapshot_preserve_min = "latest";
        snapshot_create = "onchange";
        volume."/mnt/btr_user" = {
          snapshot_dir = "btrbk_snapshots";
          subvolume = {
            data = { };
            persist = { };
          };
        };
      };
    };
  };

  networking = {
    hostName = "trantor";
    interfaces = {
      enp3s0f1.useDHCP = true;
      wlp4s0.useDHCP = true;
    };
  };

  services.xserver = { videoDrivers = [ "nvidia" ]; };
  hardware.nvidia = {
    nvidiaPersistenced = true;
    modesetting.enable = true;
    prime = {
      sync.enable = true;
      nvidiaBusId = "PCI:1:0:0";
      intelBusId = "PCI:0:2:0";
    };
  };

  system.stateVersion = "23.05";
}