nixos/hosts/alpha/hardware.nix

{
  config,
  lib,
  pkgs,
  modulesPath,
  ...
}: {
  # https://wiki.nixos.org/wiki/Install_NixOS_on_Hetzner_Cloud
  imports = [
    (modulesPath + "/profiles/qemu-guest.nix")
  ];

  boot.initrd.availableKernelModules = ["xhci_pci" "virtio_pci" "virtio_scsi" "usbhid" "sr_mod"];
  boot.initrd.kernelModules = ["dm-snapshot" "virtio_gpu"];
  boot.kernelParams = ["console=tty"];
  boot.kernelModules = [];
  boot.extraModulePackages = [];

  # https://elis.nu/blog/2020/05/nixos-tmpfs-as-root/
  fileSystems."/" = {
    device = "none";
    fsType = "tmpfs";
    options = ["defaults" "size=3G" "mode=755"]; # mode=755 so only root can write to those files
  };
  fileSystems."/boot" = {
    device = "/dev/disk/by-label/BOOT";
    fsType = "vfat";
  };
  fileSystems."/nix" = {
    device = "/dev/disk/by-label/nix";
    neededForBoot = true;
    fsType = "ext4";
  };

  swapDevices = [
    {
      device = "/nix/persist/swapfile";
      size = 4 * 1024; # 4 GiB
    }
  ];

  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
}