hive.nix: Add abstraction

hive.nix

@@ -1,21 +1,42 @@
 let
   sources = import ./npins;
+  metadata = import ./meta;
+
+  lib = import ./lib/trivial.nix;
+
+  mkNode = node: { name, nodes, ... }: {
+    # Import the base configuration for each node
+    imports = builtins.map (lib.mkRel ./machines/${node}) [
+      "_configuration.nix"
+      "_hardware-configuration.nix"
+    ];
+
+    # Deployment config is specified in meta.nodes.${node}.deployment
+    inherit (metadata.nodes.${node}) deployment;
+  };
+
+  mkNixpkgs = node: import sources."nixos-${metadata.nodes.${node}.nixpkgs}" { };
+
+  mkArgs = node: {
+    dgn-lib = import ./lib { inherit ((mkNixpkgs node)) lib; };
+  };
+
+  nodes = builtins.attrNames metadata.nodes;
 in
+
 {
   meta = {
-    nixpkgs = import sources.nixpkgs;
+    nodeNixpkgs = lib.mapSingleFuse mkNixpkgs nodes;
 
-    nodeNixpkgs = {
-    };
+    specialArgs = { meta = metadata; };
+
+    nodeSpecialArgs = lib.mapSingleFuse mkArgs nodes;
 
     # TODO: Add remote builders (`machinesFile` option)
   };
 
-  web-01 = { name, nodes, ... }: {
-    imports = [ ./machines/${name}/configuration.nix ];
-    deployment = {
-      targetUser = "root";
-      targetHost = "129.199.129.200";
-    };
+  defaults = { ... }: {
+    # Import the default modules
+    imports = [ ./modules ];
   };
-}
+} // (lib.mapSingleFuse mkNode nodes)