fix: added missing imports

modules/base.nix

@@ -4,13 +4,11 @@
 
 { lib, pkgs, config, ...}:
 let
-  inherit (lib) mkEnableOption mkOption types isDerivation hasAttr concatStringsSep;
+  inherit (lib) mkEnableOption mkOption types isDerivation hasAttr ;
   inherit (pkgs.pseudofile) dir symlink;
   inherit (pkgs.liminix.networking) address interface;
   inherit (pkgs.liminix.services) bundle;
 
-  # TODO: escape shell argument.
-  exportVar = name: value: "export ${name}=\"${value}\"";
   type_service = pkgs.liminix.lib.types.service;
 
 in {
@@ -24,24 +22,6 @@ in {
           /run/current-system, we just add the paths in /etc/profile
         '';
       };
-
-      environmentVariables = mkOption {
-        type = types.attrsOf types.str;
-        description = ''
-          Attribute set of environment variables to make available
-          in a login shell.
-
-          The value is assumed to be escaped and the name to be valid.
-        '';
-      };
-
-      prompt = mkOption {
-        type = types.str;
-        default = "$(whoami)@$(hostname) # ";
-        description = ''
-          Prompt string (PS1) for the shell.
-        '';
-      };
     };
     services = mkOption {
       type = types.attrsOf type_service;
@@ -125,14 +105,15 @@ in {
       };
     };
   };
+
+  imports = [ ./nixpkgs.nix ];
+
   config = {
     # By default, we enable cross-compilation support.
     nixpkgs.buildPlatform = lib.mkDefault builtins.currentSystem;
 
     defaultProfile.packages = with pkgs;
       [ s6 s6-init-bin execline s6-linux-init s6-rc ];
-    # Set the useful PS1 prompt by default.
-    defaultProfile.environmentVariables.PS1 = lib.mkDefault config.defaultProfile.prompt;
 
     boot.commandLine = [
       "panic=10 oops=panic init=/bin/init loglevel=8"
@@ -203,10 +184,9 @@ in {
       etc = let
         profile = symlink
           (pkgs.writeScript ".profile" ''
-            PATH=${lib.makeBinPath config.defaultProfile.packages}:/bin
+           PATH=${lib.makeBinPath config.defaultProfile.packages}:/bin
             export PATH
-            ${concatStringsSep "\n" (map exportVar config.defaultProfile.environmentVariables)}
-          '');
+            '');
       in dir {
         inherit profile;
         ashrc = profile;

modules/nixpkgs.nix

@@ -331,6 +331,8 @@ in
     };
   };
   
+  imports = [ ./misc/assertions.nix ];
+
   config = {
     _module.args = {
       pkgs =

modules/outputs/initramfs.nix

@@ -13,6 +13,14 @@ in
     boot.initramfs = {
       enable = mkEnableOption "initramfs";
     };
+    system.build.toplevel = mkOption {
+        type = types.package;
+        description = ''
+          pkgs.systemconfig for the configured filesystem,
+          contains 'activate' and 'init' commands
+        '';
+        internal = true;
+    };
     system.outputs = {
       initramfs = mkOption {
         type = types.package;
@@ -39,6 +47,8 @@ in
       INITRAMFS_COMPRESSION_ZSTD = "y";
     };
 
+    system.build.toplevel = config.system.outputs.systemConfiguration;
+
     system.outputs = {
       initramfs =
         let