Allow to umount VFS.

RomRepoMgr.Core/Filesystem/Fuse.cs

@@ -27,6 +27,7 @@ namespace RomRepoMgr.Core.Filesystem
         readonly ConcurrentDictionary<long, Stream>                                      _streamsCache;
         long                                                                             _lastHandle;
         ConcurrentDictionary<string, long>                                               _rootDirectoryCache;
+        string                                                                           _umountToken;
 
         public Fuse()
         {
@@ -107,7 +108,27 @@ namespace RomRepoMgr.Core.Filesystem
                 FillRootDirectoryCache();
 
             if(!_rootDirectoryCache.TryGetValue(pieces[0], out long romSetId))
+            {
+                if(pieces[0]    == ".fuse_umount" &&
+                   _umountToken != null)
+                {
+                    stat = new Stat
+                    {
+                        st_mode    = FilePermissions.S_IFREG | NativeConvert.FromOctalPermissionString("0444"),
+                        st_nlink   = 1,
+                        st_ctime   = NativeConvert.ToTimeT(DateTime.UtcNow),
+                        st_mtime   = NativeConvert.ToTimeT(DateTime.UtcNow),
+                        st_blksize = 0,
+                        st_blocks  = 0,
+                        st_ino     = 0,
+                        st_size    = 0
+                    };
+
+                    return 0;
+                }
+
                 return Errno.ENOENT;
+            }
 
             if(!_romSetsCache.TryGetValue(romSetId, out RomSet romSet))
             {
@@ -472,8 +493,25 @@ namespace RomRepoMgr.Core.Filesystem
         protected override Errno OnSynchronizeHandle(string file, OpenedPathInfo info, bool onlyUserData) =>
             Errno.EOPNOTSUPP;
 
-        protected override Errno OnSetPathExtendedAttribute(string path, string name, byte[] value, XattrFlags flags) =>
+        protected override Errno OnSetPathExtendedAttribute(string path, string name, byte[] value, XattrFlags flags)
-            Errno.EROFS;
+        {
+            if(_umountToken == null)
+                return Errno.EROFS;
+
+            if(path != "/.fuse_umount")
+                return Errno.EROFS;
+
+            if(name != _umountToken)
+                return Errno.EROFS;
+
+            if(value?.Length != 0)
+                return Errno.EROFS;
+
+            _umountToken = null;
+            Stop();
+
+            return 0;
+        }
 
         protected override Errno OnGetPathExtendedAttribute(string path, string name, byte[] value,
                                                             out int bytesWritten)
@@ -1155,6 +1193,18 @@ namespace RomRepoMgr.Core.Filesystem
             return Errno.EOPNOTSUPP;
         }
 
+        [DllImport("libc", SetLastError = true)]
+        static extern int setxattr(string path, string name, IntPtr value, long size, int flags);
+
+        public void Umount()
+        {
+            var    rnd   = new Random();
+            byte[] token = new byte[64];
+            rnd.NextBytes(token);
+            _umountToken = Base32.ToBase32String(token);
+            setxattr(Path.Combine(MountPoint, ".fuse_umount"), _umountToken, IntPtr.Zero, 0, 0);
+        }
+
         sealed class CachedMachine
         {
             public ulong Id   { get; set; }

RomRepoMgr.Core/Filesystem/Vfs.cs

@@ -1,7 +1,40 @@
+using System;
+using System.Threading.Tasks;
+
 namespace RomRepoMgr.Core.Filesystem
 {
-    public class Vfs
+    public class Vfs : IDisposable
     {
+        Fuse _fuse;
+
         public static bool IsAvailable => Winfsp.IsAvailable || Fuse.IsAvailable;
+
+        public void Dispose() => _fuse?.Dispose();
+
+        public event EventHandler<System.EventArgs> Umounted;
+
+        public void MountTo(string result)
+        {
+            if(Fuse.IsAvailable)
+            {
+                _fuse = new Fuse
+                {
+                    MountPoint = result
+                };
+
+                Task.Run(() =>
+                {
+                    _fuse.Start();
+
+                    Umounted?.Invoke(this, System.EventArgs.Empty);
+                });
+            }
+        }
+
+        public void Umount()
+        {
+            _fuse?.Umount();
+            _fuse = null;
+        }
     }
 }

RomRepoMgr.sln.DotSettings

@@ -1,9 +1,13 @@
 <wpf:ResourceDictionary xml:space="preserve" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:ss="urn:shemas-jetbrains-com:settings-storage-xaml" xmlns:wpf="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Aaru/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=datfiles/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=dlclose/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=libdl/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=lsar/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=romrepo/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=romrepombgrfs/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=setxattr/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/UserDictionary/Words/=Umounted/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=unar/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=Winfsp/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/UserDictionary/Words/=xattr/@EntryIndexedValue">True</s:Boolean>

RomRepoMgr/Resources/Localization.es.resx

@@ -340,4 +340,7 @@
   <data name="UnArPathLabel" xml:space="preserve">
     <value>Ruta a UnAr</value>
   </data>
+  <data name="FilesystemMenuUmountText" xml:space="preserve">
+    <value>_Desmontar</value>
+  </data>
 </root>

RomRepoMgr/Resources/Localization.resx

@@ -346,4 +346,7 @@ Do you want to delete the file?</value>
   <data name="ExitButtonText" xml:space="preserve">
     <value>Exit</value>
   </data>
+  <data name="FilesystemMenuUmountText" xml:space="preserve">
+    <value>_Umount</value>
+  </data>
 </root>

RomRepoMgr/ViewModels/MainWindowViewModel.cs

@@ -23,8 +23,10 @@
 // Copyright © 2020 Natalia Portillo
 *******************************************************************************/
 
+using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Diagnostics;
 using System.Linq;
 using System.Reactive;
 using Avalonia;
@@ -45,8 +47,8 @@ namespace RomRepoMgr.ViewModels
     public class MainWindowViewModel : ViewModelBase
     {
         readonly MainWindow _view;
-
+        RomSetModel         _selectedRomSet;
-        RomSetModel _selectedRomSet;
+        Vfs                 _vfs;
 
         public MainWindowViewModel(MainWindow view, List<RomSetModel> romSets)
         {
@@ -62,6 +64,7 @@ namespace RomRepoMgr.ViewModels
             ExportDatCommand       = ReactiveCommand.Create(ExecuteExportDatCommand);
             ExportRomsCommand      = ReactiveCommand.Create(ExecuteExportRomsCommand);
             MountCommand           = ReactiveCommand.Create(ExecuteMountCommand);
+            UmountCommand          = ReactiveCommand.Create(ExecuteUmountCommand);
             RomSets                = new ObservableCollection<RomSetModel>(romSets);
         }
 
@@ -96,6 +99,7 @@ namespace RomRepoMgr.ViewModels
         public string RomSetsMenuDeleteText => Localization.RomSetsMenuDeleteText;
         public string HelpMenuText => Localization.HelpMenuText;
         public string HelpMenuAboutText => Localization.HelpMenuAboutText;
+        public string FilesystemMenuUmountText => Localization.FilesystemMenuUmountText;
 
         public bool NativeMenuSupported =>
             NativeMenu.GetIsNativeMenuExported((Application.Current.ApplicationLifetime as
@@ -112,6 +116,13 @@ namespace RomRepoMgr.ViewModels
         public ReactiveCommand<Unit, Unit> ExportDatCommand       { get; }
         public ReactiveCommand<Unit, Unit> ExportRomsCommand      { get; }
         public ReactiveCommand<Unit, Unit> MountCommand           { get; }
+        public ReactiveCommand<Unit, Unit> UmountCommand          { get; }
+
+        public Vfs Vfs
+        {
+            get => _vfs;
+            set => this.RaiseAndSetIfChanged(ref _vfs, value);
+        }
 
         public RomSetModel SelectedRomSet
         {
@@ -304,6 +315,9 @@ namespace RomRepoMgr.ViewModels
 
         async void ExecuteMountCommand()
         {
+            if(Vfs != null)
+                return;
+
             var dlgOpen = new OpenFolderDialog
             {
                 Title = Localization.SelectMountPointDialogTitle
@@ -314,12 +328,23 @@ namespace RomRepoMgr.ViewModels
             if(result == null)
                 return;
 
-            var fs = new Fuse
+            try
             {
-                MountPoint = result
+                Vfs          =  new Vfs();
-            };
+                Vfs.Umounted += VfsOnUmounted;
+                Vfs.MountTo(result);
+            }
+            catch(Exception)
+            {
+                if(Debugger.IsAttached)
+                    throw;
 
-            fs.Start();
+                Vfs = null;
+            }
         }
+
+        void VfsOnUmounted(object sender, EventArgs e) => Vfs = null;
+
+        void ExecuteUmountCommand() => Vfs?.Umount();
     }
 }

RomRepoMgr/Views/MainWindow.xaml

@@ -20,7 +20,12 @@
                           Command="{Binding ExitCommand}" />
             </MenuItem>
             <MenuItem Header="{Binding FilesystemMenuText}" IsEnabled="{Binding IsVfsAvailable}">
-                <MenuItem Header="{Binding FilesystemMenuMountText}" Command="{Binding MountCommand}" /> <Separator />
+                <MenuItem Header="{Binding FilesystemMenuMountText}" Command="{Binding MountCommand}"
+                          IsEnabled="{Binding Vfs, Converter={x:Static ObjectConverters.IsNull}}" />
+                <Separator />
+                <MenuItem Header="{Binding FilesystemMenuUmountText}" Command="{Binding UmountCommand}"
+                          IsEnabled="{Binding Vfs, Converter={x:Static ObjectConverters.IsNotNull}}" />
+                <Separator />
             </MenuItem>
             <MenuItem Header="{Binding RomsMenuText}">
                 <MenuItem Header="{Binding RomsMenuImportText}" Command="{Binding ImportRomFolderCommand}" />