refactor: major refactor into proper reusable modules. No logical changes.

modules/distributed-config.nix

@@ -1,48 +0,0 @@
-{
-  config,
-  extraLib,
-  lib,
-  nodeName,
-  colmenaNodes,
-  ...
-}: let
-  inherit
-    (lib)
-    attrNames
-    concatMap
-    elem
-    filter
-    mdDoc
-    mkOption
-    mkOptionType
-    optionalAttrs
-    types
-    ;
-
-  inherit
-    (extraLib)
-    mergeToplevelConfigs
-    ;
-in {
-  options.nodes = mkOption {
-    type = types.attrsOf (mkOptionType {
-      name = "Toplevel NixOS config";
-      merge = loc: map (x: x.value);
-    });
-    default = {};
-    description = mdDoc "Allows extending the configuration of other machines.";
-  };
-
-  config = let
-    allNodes = attrNames colmenaNodes;
-    isColmenaNode = elem nodeName allNodes;
-    foreignConfigs = concatMap (n: colmenaNodes.${n}.config.nodes.${nodeName} or []) allNodes;
-    toplevelAttrs = ["age" "providedDomains" "networking" "systemd" "services"];
-  in
-    optionalAttrs isColmenaNode (mergeToplevelConfigs toplevelAttrs (
-      foreignConfigs
-      # Also allow extending ourselves, in case some attributes from depenent
-      # configurations such as containers or microvms are merged to the host
-      ++ [config.nodes.${nodeName} or {}]
-    ));
-}