Add multi-host configuration

based loosely on https://github.com/tom-on-the-internet/system-configuration

hosts/configuration.nix

@@ -0,0 +1,39 @@
+{ config, pkgs, user, inputs, ... }:
+
+{
+  # Automatically delete generations older than a week
+  nix.gc = {
+    automatic = true;
+    options = "--delete-generations 8d";
+  };
+
+  networking.networkmanager.enable = true;
+
+  time.timeZone = "America/Los_Angeles";
+
+  users.users.${user} = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" "audio" "video" "optical" "storage" ];
+    initialPassword = "password";
+  };
+
+  nixpkgs.config.allowUnfree = true;
+
+  nix = {
+    package = pkgs.nixVersions.stable; # flakes
+    extraOptions = "experimental-features = nix-command flakes";
+  };
+
+  environment.systemPackages = with pkgs; [
+    rustc
+    cargo
+  ];
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "22.05"; # Did you read the comment?
+}

hosts/default.nix

@@ -0,0 +1,53 @@
+{ lib, inputs, nixpkgs, home-manager, user, ... }:
+
+let
+  system = "x86_64-linux";
+  pkgs = import nixpkgs {
+    inherit system;
+    config.allowUnfree = true;
+  };
+  lib = nixpkgs.lib;
+in
+{
+  elnupad = lib.nixosSystem {
+    inherit system;
+    specialArgs = { inherit user; };
+    modules = [
+      ./elnupad
+      ./configuration.nix
+      ./desktop.nix
+      home-manager.nixosModules.home-manager {
+        home-manager.useGlobalPkgs = true;
+        home-manager.useUserPackages = true;
+        home-manager.extraSpecialArgs = { inherit user; };
+        home-manager.users.${user} = {
+          imports = [
+            (import ./home.nix)
+            (import ./elnupad/home.nix)
+          ];
+        };
+      }
+    ];
+  };
+
+  virtualbox = lib.nixosSystem {
+    inherit system;
+    specialArgs = { inherit user; };
+    modules = [
+      ./virtualbox
+      ./configuration.nix
+      ./desktop.nix
+      home-manager.nixosModules.home-manager {
+        home-manager.useGlobalPkgs = true;
+        home-manager.useUserPackages = true;
+        home-manager.extraSpecialArgs = { inherit user; };
+        home-manager.users.${user} = {
+          imports = [
+            (import ./home.nix)
+            (import ./virtualbox/home.nix)
+          ];
+        };
+      }
+    ];
+  };
+}

hosts/desktop.nix

@@ -0,0 +1,36 @@
+{ config, pkgs, ... }:
+
+{
+  services = {
+    xserver = {
+      enable = true;
+      libinput = {
+        enable = true;
+        touchpad = {
+          naturalScrolling = true;
+          tapping = true;
+        };
+      };
+      xkbOptions = "caps:escape";
+      displayManager = {
+      	lightdm.enable = true;
+        #sddm.enable = true;
+        defaultSession = "none+i3";
+      };
+      windowManager.i3 = {
+        enable = true;
+        package = pkgs.i3-gaps;
+      };
+    };
+  };
+
+  sound.enable = true;
+  hardware.pulseaudio.enable = true;
+  nixpkgs.config.pulseaudio = true;
+
+  fonts.fonts = with pkgs; [
+    noto-fonts
+    noto-fonts-cjk
+    (nerdfonts.override { fonts = [ "FiraCode" ]; }) # required for icons
+  ];
+}

hosts/elnupad/default.nix

@@ -0,0 +1,28 @@
+{ ... }:
+
+{
+  imports = [ (import ./hardware-configuration.nix) ];
+
+  boot.loader = {
+    efi = {
+      canTouchEfiVariables = true;
+      efiSysMountPoint = "/boot";
+    };
+    grub = {
+      efiSupport = true;
+      device = "nodev";
+      # 1024x768 is the closest supported resolution to X220's native 1366x768
+      # To see a list of supported GRUB resolutions, enter GRUB,
+      # press e, F2 to enter command mode, and then type videoinfo to see list
+      gfxmodeEfi = "1024x768";
+    };
+  };
+
+  networking.hostName = "elnupad";
+
+  time.timeZone = "America/Los_Angeles";
+
+  # Use X11 caps lock to escape remap in TTY
+  console.useXkbConfig = true;
+  services.xserver.xkbOptions = "caps:escape";
+}

hosts/elnupad/hardware-configuration.nix

@@ -0,0 +1,39 @@
+# 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/elnupad/home.nix

@@ -0,0 +1,3 @@
+{ pkgs, ... }: {
+
+}

hosts/home.nix

@@ -0,0 +1,45 @@
+{ config, pkgs, user, ... }:
+
+{
+  imports = [
+    ../vim.nix
+    ../wallpaper.nix
+    ../picom.nix
+    ../i3.nix
+    ../polybar
+    ../rofi
+    ../git.nix
+    ../terminal.nix
+  ];
+
+  programs.home-manager.enable = true;
+
+  home = {
+    username = "${user}";
+    homeDirectory = "/home/${user}";
+
+    stateVersion = "22.05";
+
+    packages = with pkgs; [
+      # Command line utilities
+      wget
+      neofetch
+      ranger
+      trash-cli # aliased to rm in .bashrc
+
+      # GUI applications
+      firefox
+      discord
+    ];
+
+    file = {
+      ".bashrc" = {
+        source = ../.bashrc;
+      };
+    };
+
+    sessionVariables = {
+      EDITOR = "vim";
+    };
+  };
+}

hosts/virtualbox/default.nix

@@ -0,0 +1,12 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [ ./hardware-configuration.nix ];
+
+  boot.loader.grub = {
+    enable = true;
+    device = "/dev/sda";
+  };
+
+  networking.hostName = "virtualbox";
+}

hosts/virtualbox/hardware-configuration.nix

@@ -0,0 +1,30 @@
+# 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 = [ "ata_piix" "ohci_pci" "sd_mod" "sr_mod" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-label/nixos";
+      fsType = "ext4";
+    };
+
+  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;
+
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+  virtualisation.virtualbox.guest.enable = true;
+}

hosts/virtualbox/home.nix

@@ -0,0 +1,3 @@
+{ pkgs, ... }: {
+
+}