Refactored enum and messages. Also added 9p to the list since mono misclassifies it.

src/NzbDrone.Api/Config/HostConfigResource.cs

@@ -3,6 +3,7 @@ using NzbDrone.Core.Authentication;
 using NzbDrone.Core.Configuration;
 using NzbDrone.Core.Update;
 using NzbDrone.Common.Http.Proxy;
+using NzbDrone.Core.Datastore;
 
 namespace NzbDrone.Api.Config
 {

src/NzbDrone.Core/Configuration/ConfigFileProvider.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Data.SQLite;
 using System.IO;
 using System.Linq;
 using System.Text.RegularExpressions;
@@ -12,6 +13,7 @@ using NzbDrone.Common.Extensions;
 using NzbDrone.Common.Instrumentation;
 using NzbDrone.Core.Authentication;
 using NzbDrone.Core.Configuration.Events;
+using NzbDrone.Core.Datastore;
 using NzbDrone.Core.Lifecycle;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Messaging.Events;
@@ -34,6 +36,7 @@ namespace NzbDrone.Core.Configuration
         bool AnalyticsEnabled { get; }
         string LogLevel { get; }
         string ConsoleLogLevel { get; }
+        DatabaseJournalType DatabaseJournalMode { get; }
         string Branch { get; }
         string ApiKey { get; }
         string SslCertHash { get; }
@@ -182,6 +185,8 @@ namespace NzbDrone.Core.Configuration
         public string LogLevel => GetValue("LogLevel", "Info");
         public string ConsoleLogLevel => GetValue("ConsoleLogLevel", string.Empty, persist: false);
 
+        public DatabaseJournalType DatabaseJournalMode => GetValueEnum("DatabaseJournalMode", DatabaseJournalType.Auto, persist: false);
+
         public string SslCertHash => GetValue("SslCertHash", "");
 
         public string UrlBase

src/NzbDrone.Core/Datastore/ConnectionStringFactory.cs

@@ -1,7 +1,11 @@
 using System;
 using System.Data.SQLite;
+using System.IO;
+using NzbDrone.Common.Disk;
 using NzbDrone.Common.EnvironmentInfo;
 using NzbDrone.Common.Extensions;
+using NzbDrone.Core.Configuration;
+using NLog;
 
 namespace NzbDrone.Core.Datastore
 {
@@ -14,8 +18,16 @@ namespace NzbDrone.Core.Datastore
 
     public class ConnectionStringFactory : IConnectionStringFactory
     {
-        public ConnectionStringFactory(IAppFolderInfo appFolderInfo)
+        private readonly IDiskProvider _diskProvider;
+        private readonly IConfigFileProvider _configFileProvider;
+        private readonly Logger _logger;
+
+        public ConnectionStringFactory(IAppFolderInfo appFolderInfo, IDiskProvider diskProvider, IConfigFileProvider configFileProvider, Logger logger)
         {
+            _diskProvider = diskProvider;
+            _configFileProvider = configFileProvider;
+            _logger = logger;
+
             MainDbConnectionString = GetConnectionString(appFolderInfo.GetDatabase());
             LogDbConnectionString = GetConnectionString(appFolderInfo.GetLogDatabase());
         }
@@ -30,23 +42,60 @@ namespace NzbDrone.Core.Datastore
             return connectionBuilder.DataSource;
         }
 
-        private static string GetConnectionString(string dbPath)
+        private string GetConnectionString(string dbPath)
         {
             var connectionBuilder = new SQLiteConnectionStringBuilder();
 
             connectionBuilder.DataSource = dbPath;
             connectionBuilder.CacheSize = (int)-10000;
             connectionBuilder.DateTimeKind = DateTimeKind.Utc;
-            connectionBuilder.JournalMode = OsInfo.IsOsx ? SQLiteJournalModeEnum.Truncate : SQLiteJournalModeEnum.Wal;
-            connectionBuilder.Pooling = true;
-            connectionBuilder.Version = 3;
+
+            connectionBuilder.JournalMode = GetJournalMode(dbPath);
 
             if (OsInfo.IsOsx)
             {
                 connectionBuilder.Add("Full FSync", true);
             }
 
+            connectionBuilder.Pooling = true;
+            connectionBuilder.Version = 3;
+           
             return connectionBuilder.ConnectionString;
         }
+
+        private SQLiteJournalModeEnum GetJournalMode(string path)
+        {
+            if (_configFileProvider.DatabaseJournalMode != DatabaseJournalType.Auto)
+            {
+                _logger.Debug("Database journal mode overridden by config.xml, using {0} journal mode", _configFileProvider.DatabaseJournalMode);
+                return (SQLiteJournalModeEnum)_configFileProvider.DatabaseJournalMode;
+            }
+
+            if (OsInfo.IsOsx)
+            {
+                _logger.Debug("macOS operating system, using Truncate database journal mode");
+                return SQLiteJournalModeEnum.Truncate;
+            }
+
+            var mount = _diskProvider.GetMount(path);
+
+            if (mount == null)
+            {
+                _logger.Debug("Database {0} located on unknown filesystem, using Truncate journal mode", path);
+                return SQLiteJournalModeEnum.Truncate;
+            }
+
+            if (mount.DriveType == DriveType.Network || mount.DriveType == DriveType.Unknown)
+            {
+                _logger.Debug("Database {0} located on filesystem {1} with type {2}, using Truncate journal mode", path, mount.DriveFormat, mount.DriveType);
+                return SQLiteJournalModeEnum.Truncate;
+            }
+            else
+            {
+                _logger.Debug("Database {0} located on filesystem {1} with type {2}, using WAL journal mode", path, mount.DriveFormat, mount.DriveType);
+            }
+
+            return SQLiteJournalModeEnum.Wal;
+        }
     }
 }

src/NzbDrone.Core/Datastore/DatabaseJournalType.cs

@@ -0,0 +1,12 @@
+using System.Data.SQLite;
+
+namespace NzbDrone.Core.Datastore
+{
+    public enum DatabaseJournalType
+    {
+        Auto = SQLiteJournalModeEnum.Default,
+        Wal = SQLiteJournalModeEnum.Wal,
+        Truncate = SQLiteJournalModeEnum.Truncate,
+        Delete = SQLiteJournalModeEnum.Delete
+    }
+}

src/NzbDrone.Core/NzbDrone.Core.csproj

@@ -136,6 +136,7 @@
     <Compile Include="Configuration\InvalidConfigFileException.cs" />
     <Compile Include="Configuration\RescanAfterRefreshType.cs" />
     <Compile Include="Configuration\ResetApiKeyCommand.cs" />
+    <Compile Include="Datastore\DatabaseJournalType.cs" />
     <Compile Include="Datastore\Migration\134_add_specials_folder_format.cs" />
     <Compile Include="Datastore\Migration\132_add_download_client_priority.cs" />
     <Compile Include="Datastore\Migration\131_download_propers_config.cs" />

src/NzbDrone.Mono/Disk/ProcMountProvider.cs

@@ -17,7 +17,7 @@ namespace NzbDrone.Mono.Disk
     public class ProcMountProvider : IProcMountProvider
     {
         private static string[] _fixedTypes = new [] { "ext3", "ext2", "ext4", "vfat", "fuseblk", "xfs", "jfs", "msdos", "ntfs", "minix", "hfs", "hfsplus", "qnx4", "ufs", "btrfs" };
-        private static string[] _networkDriveTypes = new [] { "cifs", "nfs", "nfs4", "nfsd", "sshfs" };
+        private static string[] _networkDriveTypes = new [] { "cifs", "nfs", "nfs4", "nfsd", "sshfs", "9p" };
         private static readonly Regex OctalRegex = new Regex(@"\\\d{3}", RegexOptions.Compiled);
 
         private const string PROC_MOUNTS_FILENAME = @"/proc/mounts";

src/Sonarr.Api.V3/Config/HostConfigResource.cs

@@ -1,6 +1,7 @@
 using NzbDrone.Common.Http.Proxy;
 using NzbDrone.Core.Authentication;
 using NzbDrone.Core.Configuration;
+using NzbDrone.Core.Datastore;
 using NzbDrone.Core.Security;
 using NzbDrone.Core.Update;
 using Sonarr.Http.REST;
@@ -20,6 +21,7 @@ namespace Sonarr.Api.V3.Config
         public string Password { get; set; }
         public string LogLevel { get; set; }
         public string ConsoleLogLevel { get; set; }
+        public DatabaseJournalType DatabaseJournalMode { get; set; }
         public string Branch { get; set; }
         public string ApiKey { get; set; }
         public string SslCertHash { get; set; }