Make Mono.Posix usage conditional on .NET Core

src/Jackett.Server/Services/FilePermissionService.cs

@@ -0,0 +1,41 @@
+using Jackett.Common.Services.Interfaces;
+using NLog;
+using System;
+#if NETCOREAPP2_2
+using Mono.Unix;
+#endif
+
+namespace Jackett.Server.Services
+{
+    public class FilePermissionService : IFilePermissionService
+    {
+        private Logger logger;
+
+        public FilePermissionService(Logger l)
+        {
+            logger = l;
+        }
+
+        public void MakeFileExecutable(string path)
+        {
+#if NETCOREAPP2_2
+
+            //Calling the file permission service to limit usage to netcoreapp. The Mono.Posix.NETStandard library causes issues outside of .NET Core
+            //https://github.com/xamarin/XamarinComponents/issues/282
+
+            logger.Debug($"Attempting to give execute permission to: {path}");
+            try
+            {
+                UnixFileInfo jackettUpdaterFI = new UnixFileInfo(path)
+                {
+                    FileAccessPermissions = FileAccessPermissions.UserReadWriteExecute | FileAccessPermissions.GroupRead | FileAccessPermissions.OtherRead
+                };
+            }
+            catch (Exception ex)
+            {
+                logger.Error(ex);
+            }
+#endif
+        }
+    }
+}