feat: add globals system

modules/nixos/common/globals.nix

@@ -0,0 +1,75 @@
+{ lib, options, ... }:
+let
+  inherit (lib)
+    mkOption
+    types
+    ;
+
+in
+{
+  options = {
+    globals = mkOption {
+      default = { };
+      type = types.submodule {
+        options = {
+          root = {
+            hashedPassword = mkOption {
+              type = types.str;
+              description = "My root user's password hash.";
+            };
+          };
+
+          myuser = {
+            name = mkOption {
+              type = types.str;
+              description = "My unix username.";
+            };
+            hashedPassword = mkOption {
+              type = types.str;
+              description = "My unix password hash.";
+            };
+          };
+
+
+          services = mkOption {
+            type = types.attrsOf (
+              types.submodule {
+                options = {
+                  domain = mkOption {
+                    type = types.str;
+                    description = "The domain under which this service can be reached";
+                  };
+                };
+              }
+            );
+          };
+
+          domains = {
+            me = mkOption {
+              type = types.str;
+              description = "My main domain.";
+            };
+
+            personal = mkOption {
+              type = types.str;
+              description = "My personal domain.";
+            };
+          };
+
+          macs = mkOption {
+            default = { };
+            type = types.attrsOf types.str;
+            description = "Known MAC addresses for external devices.";
+          };
+        };
+      };
+    };
+
+    _globalsDefs = mkOption {
+      type = types.unspecified;
+      default = options.globals.definitions;
+      readOnly = true;
+      internal = true;
+    };
+  };
+}