Use hard links for macOS app bundles

Avoid needing to get executable path from MainModule, which broke the game when run with the dotnet command instead of the bin's apphost. Fixes tests.

Robust.Shared/ContentPack/PathHelpers.cs

@@ -1,8 +1,6 @@
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.IO;
-using System.Runtime.InteropServices;
 using Robust.Shared.Utility;
 
 namespace Robust.Shared.ContentPack
@@ -17,20 +15,9 @@ namespace Robust.Shared.ContentPack
         /// </summary>
         internal static string GetExecutableDirectory()
         {
-            // TODO: remove this shitty hack, either through making it less hardcoded into shared,
-            //   or by making our file structure less spaghetti somehow.
-            string location;
-            if (Process.GetCurrentProcess().MainModule is { } mod)
-            {
-                location = mod.FileName;
-            }
-            else
-            {
-                // Fallback in case the above doesn't work ig?
-                var assembly = typeof(PathHelpers).Assembly;
-                location = assembly.Location;
-            }
-
+            // Fallback in case the above doesn't work ig?
+            var assembly = typeof(PathHelpers).Assembly;
+            var location = assembly.Location;
             if (location == string.Empty)
             {
                 // See https://docs.microsoft.com/en-us/dotnet/api/system.reflection.assembly.location?view=net-5.0#remarks

Tools/macos_make_appbundle.py

@@ -98,9 +98,21 @@ def symlink_files(src_dir: str, dest_dir: str, relative: str):
         if not symlinkable_re.match(file):
             continue
 
+        src_path = p(src_dir, file)
         dest_symlink = p(dest_dir, file)
-        if not os.path.islink(dest_symlink):
-            os.symlink(f"../../../{relative}{file}", dest_symlink)
+        if os.path.isdir(src_path):
+            # Symlink directories
+            if not os.path.islink(dest_symlink):
+                os.symlink(f"../../../{relative}{file}", dest_symlink)
+        else:
+            # Hardlink files
+            # (so that .NET doesn't report the real file path for assembly locations)
+            try:
+                os.remove(dest_symlink)
+            except FileNotFoundError:
+                pass # Fine
+
+            os.link(src_path, dest_symlink)
 
 
 main()