refactor: rename some flake attr directories

modules/base/common-nix/default.nix

@@ -0,0 +1,46 @@
+self: {
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  inherit (lib) attrValues filter findFirst hasAttr isAttrs mkIf optionalString;
+
+  inherit (self.inputs) nixd nixpkgs;
+  inherit (config.sops.secrets) access-token;
+
+  cfg = config.roles.base;
+in {
+  config = mkIf cfg.enable {
+    nix = {
+      # FIXME: infinite recursion if not set
+      package = let
+        nixdInput =
+          findFirst
+          (x: x.pname == "nix") {}
+          nixd.packages.x86_64-linux.nixd.buildInputs;
+
+        throws = x: !(builtins.tryEval x).success;
+        hasVersion = x: isAttrs x && hasAttr "version" x;
+
+        nixVersions = filter (x: ! throws x && hasVersion x) (attrValues pkgs.nixVersions);
+      in
+        findFirst (x: x.version == nixdInput.version) {} nixVersions;
+
+      # Minimize dowloads of indirect nixpkgs flakes
+      registry.nixpkgs.flake = nixpkgs;
+      nixPath = ["nixpkgs=${nixpkgs}"];
+
+      extraOptions =
+        optionalString (hasAttr "sops" config)
+        "!include ${access-token.path}";
+    };
+
+    # Global hm settings
+    home-manager.useGlobalPkgs = true;
+    home-manager.useUserPackages = true;
+  };
+
+  # For accurate stack trace
+  _file = ./default.nix;
+}