Add initial legacy configuration

nixos-configurations/ochsenchopf/default.nix

@@ -0,0 +1,38 @@
+{ ... }:
+{
+
+  imports = [
+    ./filesystems.nix
+    ./networking.nix
+
+    # TODO: Hardware
+
+  ];
+
+  nixpkgs.hostPlatform = "x86_64-linux";
+
+  virtualisation = {
+    # TODO: This should probably be somewhere else.
+    docker = {
+      enable = true;
+      enableOnBoot = false;
+    };
+    libvirtd.enable = true;
+    spiceUSBRedirection.enable = true;
+  };
+  users.extraUsers.fhauser.extraGroups = [ "libvirtd" ];
+
+  boot.extraModprobeConfig = ''
+    options kvm_intel nested=1
+    options kvm_intel emulate_invalid_guest_state=0
+    options kvm ignore_msrs=1
+  '';
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like fi:le 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 = "24.05"; # Did you read the comment?
+}

nixos-configurations/ochsenchopf/filesystems.nix

@@ -0,0 +1,43 @@
+{
+  lib,
+  ...
+}:
+{
+
+  boot.initrd.luks.devices = {
+    "luks".device = "/dev/disk/by-label/luks";
+  };
+
+  fileSystems =
+    let
+      rootdev = "/dev/disk/by-label/hv_ochsenchopf";
+    in
+    {
+      "/" = {
+        device = rootdev;
+        fsType = "btrfs";
+        options = [ "subvol=nixos" ];
+      };
+      "/home" = {
+        device = rootdev;
+        fsType = "btrfs";
+        options = [ "subvol=home" ];
+      };
+      "/boot" = {
+        device = "/dev/disk/by-label/boot";
+        fsType = "vfat";
+      };
+    };
+
+  swapDevices = [ { device = "/dev/disk/by-label/swap"; } ];
+
+  # Use the systemd-boot EFI boot loader.
+  boot.loader.systemd-boot.enable = lib.mkForce false;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  boot.initrd.systemd.enable = true;
+  boot.lanzaboote = {
+    enable = true;
+    pkiBundle = "/etc/secureboot";
+  };
+}

nixos-configurations/ochsenchopf/networking.nix

@@ -0,0 +1,26 @@
+{ ... }:
+
+{
+  networking = {
+    networkmanager = {
+      enable = true;
+      # Does currently not work...
+      #enableFccUnlock = true;
+    };
+    useDHCP = false;
+  };
+
+  services.tailscale = {
+    enable = true;
+    openFirewall = true;
+    useRoutingFeatures = "client";
+    authKeyFile = "/secrets/wireguard/tailscale-key";
+    extraUpFlags = [
+      "--operator"
+      "fhauser"
+      "--accept-routes"
+      "--exit-node=100.64.0.6"
+      "--login-server=https://vpn.qo.is"
+    ];
+  };
+}