Alternate mod dirs for validation and manual installs

Core/GameInstance.cs

@@ -355,28 +355,32 @@ public bool Scan()
             var manager = RegistryManager.Instance(this);
             using (TransactionScope tx = CkanTransaction.CreateTransactionScope())
             {
-                log.DebugFormat("Scanning for DLLs in {0}",
-                    game.PrimaryModDirectory(this));
                 var oldDlls = manager.registry.InstalledDlls.ToHashSet();
                 manager.registry.ClearDlls();
-
-                if (Directory.Exists(game.PrimaryModDirectory(this)))
+                foreach (var dir in Enumerable.Repeat<string>(game.PrimaryModDirectoryRelative, 1)
+                                              .Concat(game.AlternateModDirectoriesRelative)
+                                              .Select(d => ToAbsoluteGameDir(d)))
                 {
-                    // EnumerateFiles is *case-sensitive* in its pattern, which causes
-                    // DLL files to be missed under Linux; we have to pick .dll, .DLL, or scanning
-                    // GameData *twice*.
-                    //
-                    // The least evil is to walk it once, and filter it ourselves.
-                    var files = Directory
-                        .EnumerateFiles(game.PrimaryModDirectory(this), "*", SearchOption.AllDirectories)
-                        .Where(file => file.EndsWith(".dll", StringComparison.CurrentCultureIgnoreCase))
-                        .Select(CKANPathUtils.NormalizePath)
-                        .Where(absPath => !game.StockFolders.Any(f =>
-                            ToRelativeGameDir(absPath).StartsWith($"{f}/")));
+                    log.DebugFormat("Scanning for DLLs in {0}", dir);
 
-                    foreach (string dll in files)
+                    if (Directory.Exists(dir))
                     {
-                        manager.registry.RegisterDll(this, dll);
+                        // EnumerateFiles is *case-sensitive* in its pattern, which causes
+                        // DLL files to be missed under Linux; we have to pick .dll, .DLL, or scanning
+                        // GameData *twice*.
+                        //
+                        // The least evil is to walk it once, and filter it ourselves.
+                        var files = Directory
+                            .EnumerateFiles(dir, "*", SearchOption.AllDirectories)
+                            .Where(file => file.EndsWith(".dll", StringComparison.CurrentCultureIgnoreCase))
+                            .Select(CKANPathUtils.NormalizePath)
+                            .Where(absPath => !game.StockFolders.Any(f =>
+                                ToRelativeGameDir(absPath).StartsWith($"{f}/")));
+
+                        foreach (string dll in files)
+                        {
+                            manager.registry.RegisterDll(this, dll);
+                        }
                     }
                 }
                 var newDlls = manager.registry.InstalledDlls.ToHashSet();
@@ -432,9 +436,11 @@ public string ToAbsoluteGameDir(string path)
         /// </returns>
         public string DllPathToIdentifier(string relative_path)
         {
-            if (!relative_path.StartsWith($"{game.PrimaryModDirectoryRelative}/", StringComparison.CurrentCultureIgnoreCase))
+            var paths = Enumerable.Repeat<string>(game.PrimaryModDirectoryRelative, 1)
+                                  .Concat(game.AlternateModDirectoriesRelative);
+            if (!paths.Any(p => relative_path.StartsWith($"{p}/", StringComparison.CurrentCultureIgnoreCase)))
             {
-                // DLLs only live in the primary mod directory
+                // DLLs only live in the primary or alternate mod directories
                 return null;
             }
             Match match = dllPattern.Match(relative_path);

Core/Games/IGame.cs

@@ -17,7 +17,8 @@ public interface IGame
         string MacPath();
 
         // What do we contain?
-        string   PrimaryModDirectoryRelative { get; }
+        string   PrimaryModDirectoryRelative     { get; }
+        string[] AlternateModDirectoriesRelative { get; }
         string   PrimaryModDirectory(GameInstance inst);
         string[] StockFolders   { get; }
         string[] ReservedPaths  { get; }

Core/Games/KerbalSpaceProgram.cs

@@ -92,6 +92,7 @@ public string MacPath()
         }
 
         public string PrimaryModDirectoryRelative => "GameData";
+        public string[] AlternateModDirectoriesRelative => new string[] { };
 
         public string PrimaryModDirectory(GameInstance inst)
             => CKANPathUtils.NormalizePath(

Core/Games/KerbalSpaceProgram2.cs

@@ -97,6 +97,7 @@ public string MacPath()
         }
 
         public string PrimaryModDirectoryRelative => "GameData/Mods";
+        public string[] AlternateModDirectoriesRelative => new string[] { "BepInEx/plugins" };
 
         public string PrimaryModDirectory(GameInstance inst)
             => CKANPathUtils.NormalizePath(

Netkan/Validators/InstallsFilesValidator.cs

@@ -35,23 +35,26 @@ public void Validate(Metadata metadata)
                 {
                     throw new Kraken(string.Format(
                         "Module contains no files matching: {0}",
-                        mod.DescribeInstallStanzas(_game)
-                    ));
+                        mod.DescribeInstallStanzas(_game)));
                 }
 
                 // Get the files the module will install
                 var allFiles = _moduleService.FileDestinations(mod, file).Memoize();
 
                 // Make sure no paths include GameData other than at the start
-                var gamedatas = allFiles
-                    .Where(p => p.StartsWith("GameData", StringComparison.InvariantCultureIgnoreCase)
-                         && p.LastIndexOf("/GameData/", StringComparison.InvariantCultureIgnoreCase) > 0)
-                    .OrderBy(f => f)
-                    .ToList();
-                if (gamedatas.Any())
+                foreach (var dir in Enumerable.Repeat<string>(_game.PrimaryModDirectoryRelative, 1)
+                                              .Concat(_game.AlternateModDirectoriesRelative))
                 {
-                    var badPaths = string.Join("\r\n", gamedatas);
-                    throw new Kraken($"GameData directory found within GameData:\r\n{badPaths}");
+                    var gamedatas = allFiles
+                        .Where(p => p.StartsWith(dir, StringComparison.InvariantCultureIgnoreCase)
+                                    && p.LastIndexOf($"/{dir}/", StringComparison.InvariantCultureIgnoreCase) > 0)
+                        .OrderBy(f => f)
+                        .ToList();
+                    if (gamedatas.Any())
+                    {
+                        var badPaths = string.Join("\r\n", gamedatas);
+                        throw new Kraken($"{dir} directory found within {dir}:\r\n{badPaths}");
+                    }
                 }
 
                 // Make sure we won't try to overwrite our own files