Separate hosts for X220 and T430, generic VirtualBox host

hosts/thinkpads/default.nix

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+{ ... }:
+
+{
+  imports = [ (import ./hardware-configuration.nix) ];
+
+  boot.loader = {
+    efi = {
+      canTouchEfiVariables = true;
+      efiSysMountPoint = "/boot";
+    };
+    grub = {
+      efiSupport = true;
+      device = "nodev";
+    };
+  };
+
+  # Use X11 caps lock to escape remap in TTY
+  console.useXkbConfig = true;
+  services.xserver.xkbOptions = "caps:escape";
+}

hosts/thinkpads/hardware-configuration.nix

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+# 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 = [ ];
+
+  boot.initrd.availableKernelModules = [ "ehci_pci" "ahci" "usb_storage" "sd_mod" "sdhci_pci" ];
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+  boot.kernelModules = [ "kvm-intel" "coretemp" ];
+  boot.extraModulePackages = [ ];
+  
+  hardware.enableAllFirmware = true;
+  hardware.enableRedistributableFirmware = true;
+
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-label/nixos";
+      fsType = "ext4";
+    };
+    "/boot" = {
+      device = "/dev/disk/by-label/boot";
+      fsType = "vfat";
+    };
+  };
+
+  swapDevices = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp0s3.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}

hosts/thinkpads/home.nix

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+{ pkgs, ... }: {
+  imports = [
+    ./polybar.nix
+  ];
+}

hosts/thinkpads/polybar.nix

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+{ pkgs, lib, ... }:
+
+let
+  colors = import ../../polybar/colors.nix;
+in
+{
+  home.packages = with pkgs; [ lm_sensors ];
+  services.polybar.config = {
+   "module/cputemp" = {
+      type = "custom/script";
+
+      interval = 2;
+
+      exec = "/etc/profiles/per-user/elnu/bin/sensors | /run/current-system/sw/bin/grep \"Package id 0:\" | /run/current-system/sw/bin/tr -d '+' | /run/current-system/sw/bin/awk '{print $4}'";
+    };
+    "module/battery" = {
+      type = "internal/battery";
+      battery = "BAT0";
+      adapter = "AC";
+
+      format-low = "<animation-low> <label-low>";
+
+      label-charging = "%{F${colors.primary}}AC%{F-} %percentage%%";
+      label-discharging = "%{F${colors.primary}}BAT%{F-} %percentage%%";
+      label-full = "%{F${colors.primary}}AC%{F-}";
+
+      animation-low-0 = "%{F${colors.primary}}BAT%{F-}";
+      animation-low-1 = "%{F${colors.alert}}LOW%{F-}";
+
+      full-at = 96;
+      low-at = 10; # default
+    };
+  };
+}