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//
// Mono.Unix/UnixSymbolicLinkInfo.cs
//
// Authors:
// Jonathan Pryor (jonpryor@vt.edu)
//
// (C) 2004 Jonathan Pryor
//
// 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.
//
using System;
using System.IO;
using System.Text;
using Mono.Unix;
namespace Mono.Unix {
public sealed class UnixSymbolicLinkInfo : UnixFileSystemInfo
{
public UnixSymbolicLinkInfo (string path)
: base (path)
{
}
internal UnixSymbolicLinkInfo (string path, Stat stat)
: base (path, stat)
{
}
public override string Name {
get {return UnixPath.GetFileName (FullPath);}
}
// maximum number of bytes read from the symbolic link
public static readonly int ContentsLength = 1024;
public UnixFileSystemInfo Contents {
get {
return UnixFileSystemInfo.Create (ContentsPath);
}
}
public string ContentsPath {
get {
return ReadLink ();
}
}
public bool HasContents {
get {
return TryReadLink () != null;
}
}
public void CreateSymbolicLinkTo (string path)
{
int r = Syscall.symlink (path, OriginalPath);
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
public void CreateSymbolicLinkTo (UnixFileSystemInfo path)
{
int r = Syscall.symlink (path.FullName, OriginalPath);
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
public override void Delete ()
{
int r = Syscall.unlink (FullPath);
UnixMarshal.ThrowExceptionForLastErrorIf (r);
base.Refresh ();
}
public override void SetOwner (uint owner, uint group)
{
int r = Syscall.lchown (FullPath, owner, group);
UnixMarshal.ThrowExceptionForLastErrorIf (r);
}
// TODO: Should ReadLink be in UnixSymbolicLinkInfo?
private string ReadLink ()
{
string r = TryReadLink ();
if (r == null)
UnixMarshal.ThrowExceptionForLastError ();
return r;
}
private string TryReadLink ()
{
// Who came up with readlink(2)? There doesn't seem to be a way to
// properly handle it.
StringBuilder sb = new StringBuilder (ContentsLength+1);
int r = Syscall.readlink (FullPath, sb, (ulong) ContentsLength);
if (r == -1)
return null;
return sb.ToString().Substring (0, r);
}
}
}
// vim: noexpandtab
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