fix: create parent directories

DownloadTask.cs

@@ -617,7 +617,7 @@ StateCounter counter
 
                 var batchedFileInfo = batchedFiles[hash];
                 var path = Path.Join(filesPath, outputPaths[0]);
-                await using var file = FileHelper.Create(path);
+                await using var file = FileHelper.Create(path, true);
                 // make a stream that's only capable of reading the
                 // amount of compressed bytes
                 await using var limited = new LimitedStream(stream, (int) batchedFileInfo.SizeCompressed);
@@ -723,6 +723,9 @@ async Task DuplicateInner(string dest) {
                 throw new DeleteFileException(dest);
             }
 
+            var parent = PathHelper.GetParent(dest);
+            Plugin.Resilience.Execute(() => Directory.CreateDirectory(parent));
+
             if (!PInvoke.CreateHardLink(@$"\\?\{dest}", @$"\\?\{path}")) {
                 throw new IOException($"failed to create hard link {path} -> {dest}");
             }
@@ -811,7 +814,7 @@ await Plugin.Resilience.ExecuteAsync(
                 using var resp = await Plugin.Client.GetAsync2(uri, HttpCompletionOption.ResponseHeadersRead, this.CancellationToken.Token);
                 resp.EnsureSuccessStatusCode();
 
-                await using var file = FileHelper.Create(path);
+                await using var file = FileHelper.Create(path, true);
                 await using var stream = new GloballyThrottledStream(
                     await resp.Content.ReadAsStreamAsync(this.CancellationToken.Token),
                     this.Entries

Util/FileHelper.cs

@@ -34,7 +34,12 @@ internal static FileStream OpenRead(string path) {
     /// <param name="path">path to file to create</param>
     /// <returns>FileStream of created file</returns>
     /// <exception cref="AlreadyInUseException"/>
-    internal static FileStream Create(string path) {
+    internal static FileStream Create(string path, bool createParents = false) {
+        if (createParents) {
+            var parent = PathHelper.GetParent(path);
+            Directory.CreateDirectory(parent);
+        }
+
         return Wrap(path, File.Create);
     }
 

Util/PathHelper.cs

@@ -13,6 +13,10 @@ internal static string GetBaseName(string path) {
         return after;
     }
 
+    internal static string GetParent(string path) {
+        return Path.GetFullPath(Path.Join(path, ".."));
+    }
+
     internal static string ChangeExtension(string path, string? ext) {
         return Path.ChangeExtension(GetBaseName(path), ext);
     }