cleanup: remove old WSL interop hacks

modules/interop.nix

@@ -1,11 +1,7 @@
-{ lib, pkgs, config, ... }:
+{ lib, config, ... }:
 
 with builtins; with lib;
 {
-  imports = [
-    (mkRenamedOptionModule [ "wsl" "compatibility" "interopPreserveArgvZero" ] [ "wsl" "interop" "preserveArgvZero" ])
-  ];
-
   options.wsl.interop = with types; {
     register = mkOption {
       type = bool;
@@ -18,18 +14,6 @@ with builtins; with lib;
       default = true;
       description = "Include Windows PATH in WSL PATH";
     };
-
-    preserveArgvZero = mkOption {
-      type = nullOr bool;
-      default = null;
-      description = ''
-        Register binfmt interpreter for Windows executables with 'preserves argv[0]' flag.
-
-        Default (null): autodetect, at some performance cost.
-        To avoid the performance cost, set this to true for WSL Preview 0.58 and up,
-        or to false for any older versions, including pre-Microsoft Store and Windows 10.
-      '';
-    };
   };
 
   config =
@@ -39,39 +23,13 @@ with builtins; with lib;
     mkIf config.wsl.enable {
 
       boot.binfmt.registrations = mkIf cfg.register {
-        WSLInterop =
-          let
-            compat = cfg.preserveArgvZero;
-
-            # WSL Preview 0.58 and up registers the /init binfmt interp for Windows executable
-            # with the "preserve argv[0]" flag, so if you run `./foo.exe`, the interp gets invoked
-            # as `/init foo.exe ./foo.exe`.
-            #   argv[0] --^        ^-- actual path
-            #
-            # Older versions expect to be called without the argv[0] bit, simply as `/init ./foo.exe`.
-            #
-            # We detect that by running `/init /known-not-existing-path.exe` and checking the exit code:
-            # the new style interp expects at least two arguments, so exits with exit code 1,
-            # presumably meaning "parsing error"; the old style interp attempts to actually run
-            # the executable, fails to find it, and exits with 255.
-            compatWrapper = pkgs.writeShellScript "nixos-wsl-binfmt-hack" ''
-              /init /nixos-wsl-does-not-exist.exe
-              [ $? -eq 255 ] && shift
-              exec /init "$@"
-            '';
-
-            # use the autodetect hack if unset, otherwise call /init directly
-            interpreter = if compat == null then compatWrapper else "/init";
-
-            # enable for the wrapper and autodetect hack
-            preserveArgvZero = if compat == false then false else true;
-          in
-          {
-            magicOrExtension = "MZ";
-            fixBinary = true;
-            wrapInterpreterInShell = false;
-            inherit interpreter preserveArgvZero;
-          };
+        WSLInterop = {
+          magicOrExtension = "MZ";
+          fixBinary = true;
+          wrapInterpreterInShell = false;
+          interpreter = "/init";
+          preserveArgvZero = true;
+        };
       };
 
       warnings =