Apparently, depot could be stopped. Who knew?

config/modules/meta/network.nix

@@ -0,0 +1,66 @@
+{ pkgs, sources, lib, meta, config, ... }:
+
+/*
+This module:
+  * Makes hosts nixosModules.
+  * Manages module imports and specialArgs.
+  * Builds network.nodes.
+*/
+
+with lib;
+
+{
+  options.network = {
+    nixos = {
+      extraModules = mkOption {
+        type = types.listOf types.unspecified;
+        default = [ ];
+      };
+      specialArgs = mkOption {
+        type = types.attrsOf types.unspecified;
+        default = { };
+      };
+      modulesPath = mkOption {
+        type = types.path;
+        default = toString (pkgs.path + "/nixos/modules");
+      };
+    };
+    nodes = let
+      nixosModule = { name, config, meta, modulesPath, lib, ... }: with lib; {
+        config = {
+          nixpkgs = {
+            system = mkDefault pkgs.system;
+            pkgs = mkDefault pkgs;
+          };
+        };
+      };
+      nixosType = let
+        baseModules = import (config.network.nixos.modulesPath + "/module-list.nix");
+      in types.submoduleWith {
+        modules = baseModules
+        ++ singleton nixosModule
+        ++ config.network.nixos.extraModules;
+
+        specialArgs = {
+          inherit baseModules;
+          inherit (config.network.nixos) modulesPath;
+        } // config.network.nixos.specialArgs;
+      };
+    in mkOption {
+      type = types.attrsOf nixosType;
+      default = { };
+    };
+  };
+  config.network = {
+    nixos = {
+      extraModules = [
+        "${toString sources.home-manager}/nixos"
+        ../../modules/nixos
+      ];
+      specialArgs = {
+        inherit (config.network) nodes;
+        inherit sources meta;
+      };
+    };
+  };
+}