Fixed: Assume category path from qBittorent starting with '//' is a Windows UNC path

Radarr/Radarr#10162

src/NzbDrone.Core.Test/Download/DownloadClientTests/QBittorrentTests/QBittorrentFixture.cs

@@ -560,6 +560,34 @@ namespace NzbDrone.Core.Test.Download.DownloadClientTests.QBittorrentTests
             result.OutputRootFolders.First().Should().Be(@"C:\Downloads\Finished\QBittorrent".AsOsAgnostic());
         }
 
+        [Test]
+        public void should_correct_category_output_path()
+        {
+            var config = new QBittorrentPreferences
+            {
+                SavePath = @"C:\Downloads\Finished\QBittorrent".AsOsAgnostic()
+            };
+
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(v => v.GetConfig(It.IsAny<QBittorrentSettings>()))
+                .Returns(config);
+
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(v => v.GetApiVersion(It.IsAny<QBittorrentSettings>()))
+                .Returns(new Version(2, 0));
+
+            Mocker.GetMock<IQBittorrentProxy>()
+                .Setup(s => s.GetLabels(It.IsAny<QBittorrentSettings>()))
+                .Returns(new Dictionary<string, QBittorrentLabel>
+                    { { "tv", new QBittorrentLabel { Name = "tv", SavePath = "//server/store/downloads" } } });
+
+            var result = Subject.GetStatus();
+
+            result.IsLocalhost.Should().BeTrue();
+            result.OutputRootFolders.Should().NotBeNull();
+            result.OutputRootFolders.First().Should().Be(@"\\server\store\downloads");
+        }
+
         [Test]
         public async Task Download_should_handle_http_redirect_to_magnet()
         {

src/NzbDrone.Core/Download/Clients/QBittorrent/QBittorrent.cs

@@ -377,7 +377,15 @@ namespace NzbDrone.Core.Download.Clients.QBittorrent
             {
                 if (Proxy.GetLabels(Settings).TryGetValue(Settings.TvCategory, out var label) && label.SavePath.IsNotNullOrWhiteSpace())
                 {
-                    var labelDir = new OsPath(label.SavePath);
+                    var savePath = label.SavePath;
+
+                    if (savePath.StartsWith("//"))
+                    {
+                        _logger.Trace("Replacing double forward slashes in path '{0}'. If this is not meant to be a Windows UNC path fix the 'Save Path' in qBittorrent's {1} category", savePath, Settings.TvCategory);
+                        savePath = savePath.Replace('/', '\\');
+                    }
+
+                    var labelDir = new OsPath(savePath);
 
                     if (labelDir.IsRooted)
                     {