Use host config lib from pbb

lib/hosts.nix

@@ -0,0 +1,26 @@
+{ pkgs ? import ../pkgs {} }:
+
+with pkgs.lib;
+
+rec {
+  hostsDir = ../hosts;
+
+  hostNames = attrNames (
+    filterAttrs (
+      name: type: type == "directory"
+    ) (
+      builtins.readDir hostsDir
+    )
+  );
+
+  hosts = listToAttrs (
+    map (
+      hostName: nameValuePair hostName (
+        import (pkgs.path + "/nixos") {
+          configuration = import (hostsDir + "/${hostName}/configuration.nix");
+          system = "x86_64-linux";
+        }
+      )
+    ) hostNames
+  );
+}