Added FolderWritable to DiskProvider to centralize the check.

src/NzbDrone.Common.Test/DiskTests/DiskProviderFixtureBase.cs

@@ -8,7 +8,7 @@ using NzbDrone.Test.Common;
 
 namespace NzbDrone.Common.Test.DiskTests
 {
-    public class DiskProviderFixtureBase<TSubject> : TestBase<TSubject> where TSubject : class, IDiskProvider
+    public abstract class DiskProviderFixtureBase<TSubject> : TestBase<TSubject> where TSubject : class, IDiskProvider
     {
         public DirectoryInfo GetFilledTempFolder()
         {
@@ -46,6 +46,38 @@ namespace NzbDrone.Common.Test.DiskTests
             Subject.FolderExists(@"C:\ThisBetterNotExist\".AsOsAgnostic()).Should().BeFalse();
         }
 
+        protected abstract void SetWritePermissions(string path, bool writable);
+
+        [Test]
+        public void FolderWritable_should_return_true_for_writable_directory()
+        {
+            var tempFolder = GetTempFilePath();
+            Directory.CreateDirectory(tempFolder);
+
+            var result = Subject.FolderWritable(tempFolder);
+
+            result.Should().BeTrue();
+        }
+
+        [Test]
+        public void FolderWritable_should_return_false_for_unwritable_directory()
+        {
+            var tempFolder = GetTempFilePath();
+            Directory.CreateDirectory(tempFolder);
+
+            SetWritePermissions(tempFolder, false);
+            try
+            {
+                var result = Subject.FolderWritable(tempFolder);
+
+                result.Should().BeFalse();
+            }
+            finally
+            {
+                SetWritePermissions(tempFolder, true);
+            }
+        }
+
         [Test]
         public void MoveFile_should_overwrite_existing_file()
         {

src/NzbDrone.Common/Disk/DiskProviderBase.cs

@@ -109,6 +109,25 @@ namespace NzbDrone.Common.Disk
             }
         }
 
+        public bool FolderWritable(string path)
+        {
+            Ensure.That(path, () => path).IsValidPath();
+
+            try
+            {
+                var testPath = Path.Combine(path, "sonarr_write_test.txt");
+                var testContent = string.Format("This file was created to verify if '{0}' is writable. It should've been automatically deleted. Feel free to delete it.", path);
+                File.WriteAllText(testPath, testContent);
+                File.Delete(testPath);
+                return true;
+            }
+            catch (Exception e)
+            {
+                Logger.Trace("Directory '{0}' isn't writable. {1}", path, e.Message);
+                return false;
+            }
+        }
+
         public string[] GetDirectories(string path)
         {
             Ensure.That(path, () => path).IsValidPath();

src/NzbDrone.Common/Disk/IDiskProvider.cs

@@ -19,6 +19,7 @@ namespace NzbDrone.Common.Disk
         bool FolderExists(string path);
         bool FileExists(string path);
         bool FileExists(string path, StringComparison stringComparison);
+        bool FolderWritable(string path);
         string[] GetDirectories(string path);
         string[] GetFiles(string path, SearchOption searchOption);
         long GetFolderSize(string path);

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

@@ -122,30 +122,8 @@ namespace NzbDrone.Core.Download.Clients.Pneumatic
 
         protected override void Test(List<ValidationFailure> failures)
         {
-            failures.AddIfNotNull(TestWrite(Settings.NzbFolder, "NzbFolder"));
-            failures.AddIfNotNull(TestWrite(Settings.StrmFolder, "StrmFolder"));
-        }
-
-        private ValidationFailure TestWrite(String folder, String propertyName)
-        {
-            if (!_diskProvider.FolderExists(folder))
-            {
-                return new ValidationFailure(propertyName, "Folder does not exist");
-            }
-
-            try
-            {
-                var testPath = Path.Combine(folder, "drone_test.txt");
-                _diskProvider.WriteAllText(testPath, DateTime.Now.ToString());
-                _diskProvider.DeleteFile(testPath);
-            }
-            catch (Exception ex)
-            {
-                _logger.ErrorException(ex.Message, ex);
-                return new ValidationFailure(propertyName, "Unable to write to folder");
-            }
-
-            return null;
+            failures.AddIfNotNull(TestFolder(Settings.NzbFolder, "NzbFolder"));
+            failures.AddIfNotNull(TestFolder(Settings.StrmFolder, "StrmFolder"));
         }
 
         private String WriteStrmFile(String title, String nzbFile)

src/NzbDrone.Core/Download/DownloadClientBase.cs

@@ -104,15 +104,9 @@ namespace NzbDrone.Core.Download
 
             if (mustBeWritable)
             {
-                try
-                {
-                    var testPath = Path.Combine(folder, "drone_test.txt");
-                    _diskProvider.WriteAllText(testPath, DateTime.Now.ToString());
-                    _diskProvider.DeleteFile(testPath);
-                }
-                catch (Exception ex)
+                if (!_diskProvider.FolderWritable(folder))
                 {
-                    _logger.ErrorException(ex.Message, ex);
+                    _logger.Error("Folder '{0}' is not writable.", folder);
                     return new NzbDroneValidationFailure(propertyName, "Unable to write to folder")
                     {
                         DetailedDescription = "The folder you specified is not writable. Please verify the folder permissions for the user account that is used to execute NzbDrone."

src/NzbDrone.Core/HealthCheck/Checks/DroneFactoryCheck.cs

@@ -31,13 +31,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
                 return new HealthCheck(GetType(), HealthCheckResult.Error, "Drone factory folder does not exist");
             }
             
-            try
-            {
-                var testPath = Path.Combine(droneFactoryFolder, "drone_test.txt");
-                _diskProvider.WriteAllText(testPath, DateTime.Now.ToString());
-                _diskProvider.DeleteFile(testPath);
-            }
-            catch (Exception)
+            if (!_diskProvider.FolderWritable(droneFactoryFolder))
             {
                 return new HealthCheck(GetType(), HealthCheckResult.Error, "Unable to write to drone factory folder");
             }

src/NzbDrone.Core/HealthCheck/Checks/UpdateCheck.cs

@@ -29,13 +29,7 @@ namespace NzbDrone.Core.HealthCheck.Checks
         {
             if (OsInfo.IsWindows || _configFileProvider.UpdateAutomatically)
             {
-                try
-                {
-                    var testPath = Path.Combine(_appFolderInfo.StartUpFolder, "drone_test.txt");
-                    _diskProvider.WriteAllText(testPath, DateTime.Now.ToString());
-                    _diskProvider.DeleteFile(testPath);
-                }
-                catch (Exception)
+                if (!_diskProvider.FolderWritable(_appFolderInfo.StartUpFolder))
                 {
                     return new HealthCheck(GetType(), HealthCheckResult.Error, "Unable to update, running from write-protected folder");
                 }

src/NzbDrone.Mono.Test/DiskProviderTests/DiskProviderFixture.cs

@@ -1,4 +1,5 @@
-using NUnit.Framework;
+using Mono.Unix;
+using NUnit.Framework;
 using NzbDrone.Common.Test.DiskTests;
 
 namespace NzbDrone.Mono.Test.DiskProviderTests
@@ -11,5 +12,21 @@ namespace NzbDrone.Mono.Test.DiskProviderTests
         {
             MonoOnly();
         }
+
+        protected override void SetWritePermissions(string path, bool writable)
+        {
+            // Remove Write permissions, we're still owner so we can clean it up, but we'll have to do that explicitly.
+
+            var entry = UnixFileSystemInfo.GetFileSystemEntry(path);
+
+            if (writable)
+            {
+                entry.FileAccessPermissions |= FileAccessPermissions.UserWrite | FileAccessPermissions.GroupWrite | FileAccessPermissions.OtherWrite;
+            }
+            else
+            {
+                entry.FileAccessPermissions &= ~(FileAccessPermissions.UserWrite | FileAccessPermissions.GroupWrite | FileAccessPermissions.OtherWrite);
+            }
+        }
     }
 }

src/NzbDrone.Mono.Test/NzbDrone.Mono.Test.csproj

@@ -58,6 +58,10 @@
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\FluentAssertions.3.2.1\lib\net40\FluentAssertions.Core.dll</HintPath>
     </Reference>
+    <Reference Include="Mono.Posix, Version=4.0.0.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <SpecificVersion>False</SpecificVersion>
+      <HintPath>..\Libraries\Mono.Posix.dll</HintPath>
+    </Reference>
     <Reference Include="nunit.framework, Version=2.6.3.13283, Culture=neutral, PublicKeyToken=96d09a1eb7f44a77, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>..\packages\NUnit.2.6.3\lib\nunit.framework.dll</HintPath>

src/NzbDrone.Windows.Test/DiskProviderTests/DiskProviderFixture.cs

@@ -1,4 +1,7 @@
-using NUnit.Framework;
+using System.IO;
+using System.Security.AccessControl;
+using System.Security.Principal;
+using NUnit.Framework;
 using NzbDrone.Common.Test.DiskTests;
 
 namespace NzbDrone.Windows.Test.DiskProviderTests
@@ -11,5 +14,26 @@ namespace NzbDrone.Windows.Test.DiskProviderTests
         {
             WindowsOnly();
         }
+
+        protected override void SetWritePermissions(string path, bool writable)
+        {
+            // Remove Write permissions, we're owner and have Delete permissions, so we can still clean it up.
+
+            var owner = WindowsIdentity.GetCurrent().Owner;
+            var accessControlType = writable ? AccessControlType.Allow : AccessControlType.Deny;
+
+            if (Directory.Exists(path))
+            {
+                var ds = Directory.GetAccessControl(path);
+                ds.SetAccessRule(new FileSystemAccessRule(owner, FileSystemRights.Write, accessControlType));
+                Directory.SetAccessControl(path, ds);
+            }
+            else
+            {
+                var fs = File.GetAccessControl(path);
+                fs.SetAccessRule(new FileSystemAccessRule(owner, FileSystemRights.Write, accessControlType));
+                File.SetAccessControl(path, fs);
+            }
+        }
     }
 }