Detect if FUSE is available before allowing to use it for VFS.

RomRepoMgr.Core/Filesystem/Fuse.cs

@@ -3,6 +3,7 @@ using System.Collections.Concurrent;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Runtime.InteropServices;
 using Mono.Fuse.NETStandard;
 using Mono.Unix.Native;
 using RomRepoMgr.Database;
@@ -40,6 +41,46 @@ namespace RomRepoMgr.Core.Filesystem
             Name                 = "romrepombgrfs";
         }
 
+        public static bool IsAvailable
+        {
+            get
+            {
+                try
+                {
+                    IntPtr fuse = dlopen("libfuse.so.2", 2);
+
+                    if(fuse == IntPtr.Zero)
+                        return false;
+
+                    dlclose(fuse);
+
+                    IntPtr helper = dlopen("libMonoFuseHelper.so", 2);
+
+                    if(helper == IntPtr.Zero)
+                    {
+                        helper = dlopen("./libMonoFuseHelper.so", 2);
+
+                        if(helper == IntPtr.Zero)
+                            return false;
+                    }
+
+                    dlclose(helper);
+
+                    return true;
+                }
+                catch(Exception e)
+                {
+                    return false;
+                }
+            }
+        }
+
+        [DllImport("libdl")]
+        static extern IntPtr dlopen(string filename, int flags);
+
+        [DllImport("libdl")]
+        static extern int dlclose(IntPtr handle);
+
         protected override void Dispose(bool disposing)
         {
             if(!disposing)

RomRepoMgr/ViewModels/MainWindowViewModel.cs

@@ -101,6 +101,8 @@ namespace RomRepoMgr.ViewModels
             set => this.RaiseAndSetIfChanged(ref _selectedRomSet, value);
         }
 
+        public bool IsVfsAvailable => Fuse.IsAvailable;
+
         internal async void ExecuteSettingsCommand()
         {
             var dialog = new SettingsDialog();
@@ -288,9 +290,6 @@ namespace RomRepoMgr.ViewModels
 
         async void ExecuteMountCommand()
         {
-            // TODO: Detect if Windows or *NIX
-            // TODO: Detect if libraries are available
-
             var dlgOpen = new OpenFolderDialog
             {
                 Title = "Select mount point..."

RomRepoMgr/Views/MainWindow.xaml

@@ -16,7 +16,7 @@
                 <Separator />
                 <MenuItem Header="E_xit" IsVisible="{Binding !NativeMenuSupported}" Command="{Binding ExitCommand}" />
             </MenuItem>
-            <MenuItem Header="File_system">
+            <MenuItem Header="File_system" IsEnabled="{Binding IsVfsAvailable}">
                 <MenuItem Header="_Mount" Command="{Binding MountCommand}" /> <Separator />
             </MenuItem>
             <MenuItem Header="_ROMs">