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//
// ExtendedAttribute.cs
//
// Copyright (C) 2004 Novell, Inc.
//
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// FIXME: This is not portable to Win32
using System;
using System.IO;
using System.Text;
using System.Runtime.InteropServices;
using Mono.Unix.Native;
namespace Beagle.Util {
public class ExtendedAttribute {
private static string AddPrefix (string name)
{
return "user.Beagle." + name;
}
static Encoding encoding = new UTF8Encoding ();
public static void Set (string path, string name, string value)
{
if (! FileSystem.Exists (path))
throw new IOException (path);
name = AddPrefix (name);
byte[] buffer = encoding.GetBytes (value);
int retval = Syscall.lsetxattr (path, name, buffer);
if (retval == -1)
throw new IOException ("Could not set extended attribute on " + path + ": " + Mono.Unix.Native.Stdlib.strerror (Mono.Unix.Native.Stdlib.GetLastError ()));
}
public static bool Exists (string path, string name)
{
if (! FileSystem.Exists (path))
throw new IOException (path);
name = AddPrefix (name);
long size = Syscall.lgetxattr (path, name, null, 0);
return size >= 0;
}
public static string Get (string path, string name)
{
if (! FileSystem.Exists (path))
throw new IOException (path);
name = AddPrefix (name);
byte[] buffer;
long size = Syscall.lgetxattr (path, name, out buffer);
if (size <= 0)
return null;
return encoding.GetString (buffer);
}
public static void Remove (string path, string name)
{
if (! FileSystem.Exists (path))
throw new IOException (path);
name = AddPrefix (name);
int retval = Syscall.lremovexattr (path, name);
if (retval != 0)
throw new IOException ("Could not remove extended attribute on " + path + ": " + Mono.Unix.Native.Stdlib.strerror (Mono.Unix.Native.Stdlib.GetLastError ()));
}
// Check to see if it is possible to get and set attributes on a given file.
public static bool Test (string path)
{
const string test_key = "__test_key__";
const string test_value = "__test_value__";
try {
Set (path, test_key, test_value);
if (Get (path, test_key) != test_value)
return false;
Remove (path, test_key);
return Get (path, test_key) == null;
} catch (Exception ex) {
return false;
}
}
private static bool ea_support_tested = false;
private static bool ea_supported = false;
public static bool Supported {
get {
if (ea_support_tested)
return ea_supported;
if (Environment.GetEnvironmentVariable ("BEAGLE_DISABLE_XATTR") != null) {
Logger.Log.Debug ("BEAGLE_DISABLE_XATTR is set");
ea_supported = false;
ea_support_tested = true;
return false;
}
ea_supported = Test (PathFinder.HomeDir);
ea_support_tested = true;
return ea_supported;
}
}
}
}
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