[tomboy] Check that FUSE is enabled using /proc/filesystems, not lsmod. Fixes bug #500524.

[Sanford Armstrong <sharm src gnome org>]

commit bafbfc3f1c77e4c04cc272af80b61f10421d1982
Author: Sandy Armstrong <sanfordarmstrong gmail com>
Date:   Thu May 7 18:01:56 2009 -0700

    Check that FUSE is enabled using /proc/filesystems, not lsmod. Fixes bug #500524.
    
    Thanks to alonlevy1 gmail com and Martin Pitt for the help fixing this bug.
---
 Tomboy/Synchronization/SyncUtils.cs |   36 ++++++++++------------------------
 1 files changed, 11 insertions(+), 25 deletions(-)

diff --git a/Tomboy/Synchronization/SyncUtils.cs b/Tomboy/Synchronization/SyncUtils.cs
index 095eb0c..f600d4e 100644
--- a/Tomboy/Synchronization/SyncUtils.cs
+++ b/Tomboy/Synchronization/SyncUtils.cs
@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.IO;
+using System.Text.RegularExpressions;
 using Mono.Unix;
 
 namespace Tomboy.Sync
@@ -82,34 +83,19 @@ namespace Tomboy.Sync
 
 
 		/// <summary>
-		/// Calls lsmod to check for fuse in the output
+		/// Checks /proc/filesystems to check for fuse in the output
 		/// </summary>
 		public static bool IsFuseEnabled ()
 		{
-			if (string.IsNullOrEmpty (lsmodTool))
-				throw new InvalidOperationException ("Unable to check if FUSE is enabled without a valid lsmod tool.");
-
-			Process p = new Process ();
-			p.StartInfo.UseShellExecute = false;
-			p.StartInfo.RedirectStandardOutput = true;
-			// TODO: Is calling lsmod safe enough?  i.e., can we be guaranteed it's gonna be there?
-			p.StartInfo.FileName = lsmodTool;
-			p.StartInfo.CreateNoWindow = true;
-			p.Start ();
-			string output = p.StandardOutput.ReadToEnd ();
-			p.WaitForExit ();
-
-			if (p.ExitCode == 1) {
-				Logger.Debug ("Error calling lsmod in SyncUtils.IsFuseEnabled ()");
-				return false;
-			}
-
-			if (output.IndexOf ("fuse") == -1) {
-				Logger.Debug ("Could not find 'fuse' in lsmod output");
-				return false;
-			}
-
-			return true;
+			try {
+				string fsFileName = "/proc/filesystems";
+				if (File.Exists (fsFileName)) {
+					string fsOutput = new System.IO.StreamReader (fsFileName).ReadToEnd ();
+					Regex fuseEx = new Regex ("\\s+fuse\\s+");
+					return fuseEx.Match (fsOutput).Success;
+				}
+			} catch { }
+			return false;
 		}
 
 		/// <summary>