New: Write PID file to AppData directory on Linux/OS X

src/NzbDrone.Common/EnvironmentInfo/AppFolderFactory.cs

@@ -1,9 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Security.AccessControl;
 using System.Security.Principal;
-using System.Text;
 using NLog;
 using NzbDrone.Common.Disk;
 using NzbDrone.Common.Instrumentation;

src/NzbDrone.Common/NzbDrone.Common.csproj

@@ -103,6 +103,7 @@
     <Compile Include="Messaging\IMessage.cs" />
     <Compile Include="PathEqualityComparer.cs" />
     <Compile Include="Processes\INzbDroneProcessProvider.cs" />
+    <Compile Include="Processes\PidFileProvider.cs" />
     <Compile Include="Processes\ProcessOutput.cs" />
     <Compile Include="RateGate.cs" />
     <Compile Include="Serializer\IntConverter.cs" />

src/NzbDrone.Common/Processes/PidFileProvider.cs

@@ -0,0 +1,44 @@
+using System;
+using System.IO;
+using NLog;
+using NzbDrone.Common.EnvironmentInfo;
+
+namespace NzbDrone.Common.Processes
+{
+    public interface IProvidePidFile
+    {
+        void Write();
+    }
+
+    public class PidFileProvider : IProvidePidFile
+    {
+        private readonly IAppFolderInfo _appFolderInfo;
+        private readonly IProcessProvider _processProvider;
+        private readonly Logger _logger;
+
+        public PidFileProvider(IAppFolderInfo appFolderInfo, IProcessProvider processProvider, Logger logger)
+        {
+            _appFolderInfo = appFolderInfo;
+            _processProvider = processProvider;
+            _logger = logger;
+        }
+
+        public void Write()
+        {
+            var filename = Path.Combine(_appFolderInfo.AppDataFolder, "nzbdrone.pid");
+
+            if (OsInfo.IsMono)
+            {
+                try
+                {
+                    File.WriteAllText(filename, _processProvider.GetCurrentProcess().Id.ToString());
+                }
+                catch (Exception ex)
+                {
+                    _logger.Error("Unable to write PID file: " + filename, ex);
+                    throw;
+                }
+            }
+        }
+    }
+}

src/NzbDrone.Host/ApplicationServer.cs

@@ -24,7 +24,6 @@ namespace NzbDrone.Host
         private readonly PriorityMonitor _priorityMonitor;
         private readonly IStartupContext _startupContext;
         private readonly IBrowserService _browserService;
-        private readonly IProcessProvider _processProvider;
         private readonly Logger _logger;
 
         public NzbDroneServiceFactory(IConfigFileProvider configFileProvider, 
@@ -33,7 +32,6 @@ namespace NzbDrone.Host
                                       PriorityMonitor priorityMonitor, 
                                       IStartupContext startupContext, 
                                       IBrowserService browserService, 
-                                      IProcessProvider processProvider, 
                                       Logger logger)
         {
             _configFileProvider = configFileProvider;
@@ -42,7 +40,6 @@ namespace NzbDrone.Host
             _priorityMonitor = priorityMonitor;
             _startupContext = startupContext;
             _browserService = browserService;
-            _processProvider = processProvider;
             _logger = logger;
         }
 

src/NzbDrone.Host/Bootstrap.cs

@@ -34,6 +34,7 @@ namespace NzbDrone.Host
 
                 _container = MainAppContainerBuilder.BuildContainer(startupContext);
                 _container.Resolve<IAppFolderFactory>().Register();
+                _container.Resolve<IProvidePidFile>().Write();
 
                 var appMode = GetApplicationMode(startupContext);