Add the x220 host

I don't have the time to split this commit

hosts/x220/default.nix

@@ -0,0 +1,75 @@
+{ pkgs, ... }:
+
+{
+  imports = [
+    ./hardware-configuration.nix
+    ./persist.nix
+    ../../home/default.nix
+
+    ../../modules/desktop/environments/river.nix
+    ../../modules/system/basic.nix
+    ../../modules/system/security.nix
+    ../../modules/desktop/apps/communication.nix
+    ../../modules/desktop/apps/multimedia.nix
+    ../../modules/system/development.nix
+    ../../modules/packages/firefox.nix
+    ../../modules/packages/zsh.nix
+    ../../modules/packages/fastfetch.nix
+  ];
+
+  boot = {
+    loader.grub = {
+      enable = true;
+      device = "/dev/sda";
+      gfxmodeEfi = "1366x768";
+    };
+    kernelPackages = pkgs.linuxPackages_xanmod_latest;
+    supportedFilesystems = [ "btrfs" ];
+  };
+
+  networking = {
+    hostName = "x220";
+    networkmanager.enable = true;
+  };
+
+  users.users.hu.extraGroups = [ "networkmanager" ];
+
+  time.timeZone = "Europe/Berlin";
+
+  i18n.defaultLocale = "en_US.UTF-8";
+  console = {
+    font = "Lat2-Terminus16";
+    keyMap = "de";
+    # useXkbConfig = true;
+  };
+
+  nixpkgs.config.allowUnfree = true;
+
+  programs.mtr.enable = true;
+  programs.gnupg.agent = {
+    enable = true;
+    enableSSHSupport = true;
+  };
+
+  security.rtkit.enable = true;
+  services.pipewire = {
+    enable = true;
+    alsa = {
+      enable = true;
+      support32Bit = true;
+    };
+    pulse.enable = true;
+    jack.enable = true;
+  };
+
+  services.tlp.enable = true;
+
+  nix = {
+    extraOptions = ''
+      experimental-features = nix-command flakes
+    '';
+  };
+
+  system.stateVersion = "24.05";
+}
+

hosts/x220/hardware-configuration.nix

@@ -0,0 +1,61 @@
+{ config, lib, modulesPath, ... }:
+
+{
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/e0b531cf-b575-4579-b866-9b7265e01b0a";
+    fsType = "btrfs";
+    options = [ "subvol=root" "compress=zstd" "noatime" "ssd" ];
+  };
+
+  fileSystems."/nix" = {
+    device = "/dev/disk/by-uuid/e0b531cf-b575-4579-b866-9b7265e01b0a";
+    fsType = "btrfs";
+    options = [ "subvol=nix" "compress=zstd" "noatime" "ssd" ];
+    neededForBoot = true;
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/bfe6e556-44e9-427f-9ae6-eddae6c62298";
+    fsType = "ext4";
+  };
+
+  boot.initrd.luks.devices."vg".device = "/dev/disk/by-uuid/92b4f484-2c00-47e7-baf6-9f396883e231";
+  boot.initrd.availableKernelModules = [ 
+    "ehci_pci" "ahci" "xhci_pci" "usb_storage" "sd_mod" "sdhci_pci"
+  ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.initrd.postDeviceCommands = lib.mkAfter ''
+    mkdir /btrfs_tmp
+    mount ${config.fileSystems."/".device} /btrfs_tmp
+    if [[ -e /btrfs_tmp/root ]]; then
+        mkdir -p /btrfs_tmp/old_roots
+        timestamp=$(date --date="@$(stat -c %Y /btrfs_tmp/root)" "+%Y-%m-%-d_%H:%M:%S")
+        mv /btrfs_tmp/root "/btrfs_tmp/old_roots/$timestamp"
+    fi
+
+    delete_subvolume_recursively() {
+        IFS=$'\n'
+        for i in $(btrfs subvolume list -o "$1" | cut -f 9- -d ' '); do
+            delete_subvolume_recursively "/btrfs_tmp/$i"
+        done
+        btrfs subvolume delete "$1"
+    }
+
+    for i in $(find /btrfs_tmp/old_roots/ -maxdepth 1 -mtime +30); do
+        delete_subvolume_recursively "$i"
+    done
+
+    btrfs subvolume create /btrfs_tmp/root
+    umount /btrfs_tmp
+  '';
+
+  networking.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}
+

hosts/x220/persist.nix

@@ -0,0 +1,23 @@
+{ ... }:
+
+{
+  environment.persistence."/nix/persist" = {
+    hideMounts = true;
+    directories = [
+      "/var/log"
+      "/var/lib/nixos"
+      "/var/lib/systemd/coredump"
+      { 
+        directory = "/var/lib/colord";
+        user = "colord";
+        group = "colord";
+        mode = "u=rwx,g=rx,o=";
+      }
+      "/etc/NetworkManager/system-connections"
+    ];
+    files = [
+      "/etc/machine-id"
+    ];
+  };
+}
+