configuration.nix

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

{
  imports = [
    ./hardware-configuration.nix
  ];

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;

  boot.zfs.devNodes = "/dev";

  boot.kernelPackages = lib.last (
    lib.sort (a: b: (lib.versionOlder a.kernel.version b.kernel.version)) (
      builtins.attrValues (
        lib.filterAttrs (
          name: kernelPackages:
          (builtins.match "linux_[0-9]+_[0-9]+" name) != null
          && (builtins.tryEval kernelPackages).success
          && (!kernelPackages.${config.boot.zfs.package.kernelModuleAttribute}.meta.broken)
        ) pkgs.linuxKernel.packages
      )
    )
  );
  boot.initrd.systemd.services.zfs-rollback = {
    wantedBy = [ "initrd.target" ];
    after = [ "zfs-import-tank.service" ];
    before = [ "sysroot.mount" ];
    path = [ pkgs.zfs ];
    unitConfig.DefaultDependencies = false;
    serviceConfig.Type = "oneshot";
    script = ''
      zfs rollback -r tank/local/root@blank && echo done
    '';
  };

  networking.networkmanager.enable = true;
  networking.hostId = "deadbeef";

  services.displayManager.gdm.enable = true;
  services.desktopManager.gnome.enable = true;

  users.users.will = {
    isNormalUser = true;
    password = "asdf";
    extraGroups = [ "wheel" ];
  };

  users.users.root.password = "asdf";

  system.stateVersion = "26.05";

}

hardware-configuration.nix

# Do not modify this file!  It was generated by ‘nixos-generate-config’
# and may be overwritten by future invocations.  Please make changes
# to /etc/nixos/configuration.nix instead.
{
  config,
  lib,
  pkgs,
  modulesPath,
  ...
}:

{
  imports = [
    (modulesPath + "/profiles/qemu-guest.nix")
  ];

  boot.initrd.availableKernelModules = [
    "ahci"
    "xhci_pci"
    "virtio_pci"
    "sr_mod"
    "virtio_blk"
  ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ "kvm-amd" ];
  boot.extraModulePackages = [ ];

  fileSystems."/" = {
    device = "tank/local/root";
    fsType = "zfs";
  };

  fileSystems."/nix" = {
    device = "tank/local/nix";
    fsType = "zfs";
  };

  fileSystems."/boot" = {
    device = "/dev/disk/by-uuid/4095-C817";
    fsType = "vfat";
    options = [
      "fmask=0077"
      "dmask=0077"
    ];
  };

  fileSystems."/etc/nixos" = {
    device = "tank/local/nixos";
    fsType = "zfs";
  };

  swapDevices = [ ];

  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
}