// // 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; } } } }