Put system configuration under Version Control

nixos/.gitignore

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+# This file must be a symlink of the physical machine’s config file
+hardware-configuration.nix

nixos/configuration.nix

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+# 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, ... }:
+
+{
+  imports =
+    [
+      ./hardware-configuration.nix
+    ];
+
+  # Use the GRUB 2 boot loader.
+  boot.loader.grub.enable = true;
+  boot.loader.grub.version = 2;
+  # boot.loader.grub.efiSupport = true;
+  # boot.loader.grub.efiInstallAsRemovable = true;
+  # boot.loader.efi.efiSysMountPoint = "/boot/efi";
+  # Define on which hard drive you want to install Grub.
+  boot.loader.grub.device = "/dev/nvme0n1"; # or "nodev" for efi only
+
+  boot.cleanTmpDir = true;
+
+  networking.hostName = "pierre"; # Define your hostname.
+  networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+
+  hardware.trackpoint.enable = true;
+  hardware.trackpoint.emulateWheel = true;
+  hardware.trackpoint.speed = 250;
+  hardware.trackpoint.sensitivity = 150;
+
+  # Select internationalisation properties.
+  i18n = {
+    consoleKeyMap = "fr-bepo";
+  };
+
+  # Set your time zone.
+  time.timeZone = "Europe/Paris";
+
+  # List packages installed in system profile. To search, run:
+  # $ nix search wget
+  environment.systemPackages = with pkgs; [
+    thunderbolt
+    wpa_supplicant
+    wpa_supplicant_gui
+    gitAndTools.gitFull
+    docker
+    firefox
+    unbound
+  ];
+
+  # Specific configuration
+  environment.pathsToLink = [ "/share/zsh" ];
+
+  # Some programs need SUID wrappers, can be configured further or are
+  # started in user sessions.
+  # programs.mtr.enable = true;
+  # programs.gnupg.agent = { enable = true; enableSSHSupport = true; };
+  programs.zsh.enable = true; # see https://github.com/NixOS/nixpkgs/issues/20548#issuecomment-261965667
+  programs.light.enable = true;
+
+  # List services that you want to enable:
+  services.nscd.enable = true;
+  services.nixosManual.showManual = true;
+  services.tlp.enable = true;
+  services.upower.enable = true; # keyboard backlight
+
+  # see https://github.com/NixOS/nixpkgs/blob/2380f6a4faa57c6b91fed26c496e1c8ca5d91982/nixos/modules/services/networking/unbound.nix#L52
+  services.unbound = {
+    enable = true;
+    extraConfig = ''
+cache-max-negative-ttl: 0
+local-zone: "test." redirect
+local-data: "test. 10800 IN NS localhost."
+local-data: "test. 10800 IN SOA test. nobody.invalid. 1 3600 1200 604800 10800"
+local-data: "test. 10800 IN A 172.10.0.10"
+    '';
+  };
+  virtualisation.docker.enable = true;
+
+  # Disable the firewall altogether.
+  networking.firewall.enable = false;
+
+  # Enable CUPS to print documents.
+  services.printing.enable = true;
+
+  # Enable sound.
+  sound.enable = true;
+  hardware.pulseaudio.enable = true;
+
+  # Enable the X11 windowing system.
+  services.xserver.enable = true;
+  services.xserver.layout = "fr";
+  services.xserver.xkbVariant = "bepo";
+  # services.xserver.xkbOptions = "eurosign:e";
+
+  # Enable touchpad support.
+  services.xserver.libinput.enable = true;
+
+  services.xserver.videoDriver = "modesetting"; # to prevent "xrandr: Configure crtc 1 failed" issues
+  services.xserver.displayManager.gdm.wayland = false;
+  services.xserver.windowManager.i3.enable = true;
+
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+  users.users.pierre = {
+     isNormalUser = true;
+     uid = 1000;
+     home = "/home/pierre";
+     shell = pkgs.zsh;
+     extraGroups = [ "audio" "wheel" "networkmanager" "docker" ];
+  };
+
+  system.autoUpgrade.enable = true;
+  # This value determines the NixOS release with which your system is to be
+  # compatible, in order to avoid breaking some software such as database
+  # servers. You should change this only after NixOS release notes say you
+  # should.
+  system.stateVersion = "18.09"; # Did you read the comment?
+
+}

nixos/hardware-configuration.work-laptop.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, ... }:
+
+{
+  imports =
+    [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "nvme" "usb_storage" "sd_mod" ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/51b9ad68-2755-4939-8735-59e19560d24c";
+      fsType = "ext4";
+    };
+
+  swapDevices = [ ];
+
+  nix.maxJobs = lib.mkDefault 8;
+  powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
+}