fix callPackage for stable users

default.nix

@@ -39,10 +39,7 @@ let
         source = mkOption {
           type = nullOr (either path str);
           default = null;
-          description = ''
-            Path of the source file or directory.
-            Be sure to quote paths you don't want nix to copy to the store.
-          '';
+          description = "Path of the source file or directory - be sure to quote paths you don't want nix to copy to the store.";
         };
 
         executable = mkOption {
@@ -95,20 +92,6 @@ in
         '';
       };
       enable = mkEnableOption "Arbitrary Symlink Manager";
-      impure = mkOption {
-        type = bool;
-        default = false;
-        description = ''
-          Expand ~ and environment variables in paths, similar to if you were in a shell.
-        '';
-      };
-      variables = mkOption {
-        type = attrsOf str;
-        default = { };
-        description = ''
-          A set of environment variables to use in the deployment.
-        '';
-      };
     };
     files = mkOption {
       description = "Files to link";
@@ -163,7 +146,6 @@ in
         text = (
           builtins.toJSON {
             inherit files;
-            inherit (config.envionrment.arbys) impure;
             clobber_by_default = config.environment.arbys.clobber;
             version = 1;
           }
@@ -213,10 +195,11 @@ in
               "arbys-copy.service"
             ];
             after = [ "arbys-prep.service" ];
-            environment = config.environment.arbys.variables;
             script =
               let
-                linker = lib.getExe (pkgs.smfh or (pkgs.callPackage ./smfh.nix { }));
+                linker = lib.getExe (
+                  pkgs.smfh or (pkgs.callPackage (pkgs.rustPlatform.buildRustPackage ./smfh.nix { }))
+                );
               in
               ''
                 new_manifest=${manifest}