Fixed: Slower daemon startup loop if Sonarr runs into non-recoverable errors such as unwritable pid/appfolder/config file.

src/NzbDrone.Common/EnvironmentInfo/AppFolderFactory.cs

@@ -3,6 +3,7 @@ using System.Security.AccessControl;
 using System.Security.Principal;
 using NLog;
 using NzbDrone.Common.Disk;
+using NzbDrone.Common.Exceptions;
 using NzbDrone.Common.Instrumentation;
 
 namespace NzbDrone.Common.EnvironmentInfo
@@ -33,6 +34,11 @@ namespace NzbDrone.Common.EnvironmentInfo
             {
                 SetPermissions();
             }
+
+            if (!_diskProvider.FolderWritable(_appFolderInfo.AppDataFolder))
+            {
+                throw new SonarrStartupException("AppFolder {0} is not writable", _appFolderInfo.AppDataFolder);
+            }
         }
 
         private void SetPermissions()