313 lines
12 KiB
C#
313 lines
12 KiB
C#
/*
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Tesses.VirtualFilesystem a library for virtual filesystems in .NET
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Copyright (C) 2023 Mike Nolan
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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using System;
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using Tesses.VirtualFilesystem;
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using Tesses.VirtualFilesystem.Extensions;
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using System.IO;
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using System.Threading.Tasks;
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using System.Threading;
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using System.Linq;
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using System.Collections.Generic;
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using System.Text;
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using System.Runtime.InteropServices;
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using System.ComponentModel;
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namespace Tesses.VirtualFilesystem.Filesystems
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{
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public class LocalFileSystem : SyncFileSystem
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{
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public override string ConvertPathFromUnixPath(UnixPath path)
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{
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return path.ToLocal();
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}
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public override UnixPath ConvertPathToUnixPath(string path)
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{
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return UnixPath.FromLocal(path);
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}
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public override void CreateDirectory(UnixPath directory)
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{
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Directory.CreateDirectory(ConvertPathFromUnixPath(directory));
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}
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public override void DeleteDirectory(UnixPath path)
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{
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Directory.Delete(ConvertPathFromUnixPath(path));
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}
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public override void DeleteFile(UnixPath path)
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{
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File.Delete(ConvertPathFromUnixPath(path));
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}
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public override bool DirectoryExists(UnixPath path)
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{
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return Directory.Exists(ConvertPathFromUnixPath(path));
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}
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public override IEnumerable<UnixPath> EnumerateFileSystemEntries(UnixPath path)
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{
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foreach(var item in Directory.EnumerateFileSystemEntries(ConvertPathFromUnixPath(path)))
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{
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yield return ConvertPathToUnixPath(item);
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}
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}
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public override bool FileExists(UnixPath path)
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{
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return File.Exists(ConvertPathFromUnixPath(path));
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}
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public override DateTime GetCreationTime(UnixPath path)
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{
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return FileExists(path) ? File.GetCreationTime(ConvertPathFromUnixPath(path)) : Directory.GetCreationTime(ConvertPathFromUnixPath(path));
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}
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public override DateTime GetLastAccessTime(UnixPath path)
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{
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return FileExists(path) ? File.GetLastAccessTime(ConvertPathFromUnixPath(path)) : Directory.GetLastAccessTime(ConvertPathFromUnixPath(path));
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}
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public override DateTime GetLastWriteTime(UnixPath path)
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{
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return FileExists(path) ? File.GetLastAccessTime(ConvertPathFromUnixPath(path)) : Directory.GetLastWriteTime(ConvertPathFromUnixPath(path));
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}
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public override void MoveDirectory(UnixPath src, UnixPath dest)
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{
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Directory.Move(ConvertPathFromUnixPath(src),ConvertPathFromUnixPath(dest));
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}
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public override void MoveFile(UnixPath src, UnixPath dest)
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{
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File.Move(ConvertPathFromUnixPath(src),ConvertPathFromUnixPath(dest));
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}
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public override Stream Open(UnixPath path, FileMode mode, FileAccess access, FileShare share)
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{
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return File.Open(ConvertPathFromUnixPath(path),mode,access,share);
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}
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public override void SetCreationTime(UnixPath path, DateTime time)
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{
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if(FileExists(path))
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{
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File.SetCreationTime(ConvertPathFromUnixPath(path),time);
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}
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else
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{
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Directory.SetCreationTime(ConvertPathFromUnixPath(path),time);
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}
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}
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public override void SetLastAccessTime(UnixPath path, DateTime time)
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{
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if(FileExists(path))
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{
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File.SetLastAccessTime(ConvertPathFromUnixPath(path),time);
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}
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else
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{
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Directory.SetLastAccessTime(ConvertPathFromUnixPath(path),time);
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}
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}
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private class LocalWatcher : IVirtualWatcher
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{
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FileSystemWatcher watcher;
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LocalFileSystem _fs;
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public LocalWatcher(LocalFileSystem fs,UnixPath path)
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{
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watcher=new FileSystemWatcher(fs.ConvertPathFromUnixPath(path));
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watcher.Changed += (sender,e)=>{
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Changed?.Invoke(this,new VirtualWatcherChangedArgs(fs,e.ChangeType,fs.ConvertPathToUnixPath(e.FullPath)));
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};
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watcher.Created += (sender,e)=>{
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Created?.Invoke(this,new VirtualWatcherChangedArgs(fs,e.ChangeType,fs.ConvertPathToUnixPath(e.FullPath)));
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};
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watcher.Deleted += (sender,e)=>{
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Deleted?.Invoke(this,new VirtualWatcherChangedArgs(fs,e.ChangeType,fs.ConvertPathToUnixPath(e.FullPath)));
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};
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watcher.Error += (sender,e)=>{
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Error?.Invoke(this,e);
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};
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watcher.Renamed += (sender,e)=>{
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Renamed?.Invoke(this,new VirtualWatcherRenamedEventArgs(fs,e.ChangeType,fs.ConvertPathToUnixPath(e.FullPath),fs.ConvertPathToUnixPath(e.OldFullPath)));
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};
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_fs=fs;
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}
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public int InternalBufferSize { get => watcher.InternalBufferSize; set => watcher.InternalBufferSize=value;}
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public NotifyFilters NotifyFilter { get => watcher.NotifyFilter; set => watcher.NotifyFilter=value; }
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public bool EnableRaisingEvents { get => watcher.EnableRaisingEvents; set => watcher.EnableRaisingEvents=value; }
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public string Filter { get => watcher.Filter; set => watcher.Filter=value; }
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public bool IncludeSubdirectories { get => watcher.IncludeSubdirectories; set => watcher.IncludeSubdirectories=value;}
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public event EventHandler<VirtualWatcherChangedArgs> Changed;
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public event EventHandler<VirtualWatcherChangedArgs> Created;
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public event EventHandler<VirtualWatcherChangedArgs> Deleted;
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public event EventHandler<VirtualWatcherRenamedEventArgs> Renamed;
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public event EventHandler<ErrorEventArgs> Error;
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}
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public override IVirtualWatcher WatchDirectory(UnixPath dir)
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{
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return new LocalWatcher(this,dir);
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}
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public override void CreateHardlink(UnixPath src, UnixPath dest)
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{
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if(DirectoryExists(src)) return;
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if(Environment.OSVersion.Platform == PlatformID.Win32NT)
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{
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WindowsNative.CreateHardlink(ConvertPathFromUnixPath(dest),ConvertPathFromUnixPath(src),IntPtr.Zero);
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}
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else
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{
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Mono.Unix.Native.Syscall.link(ConvertPathFromUnixPath(src),ConvertPathFromUnixPath(dest));
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}
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}
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public override void CreateSymlink(UnixPath src, UnixPath dest)
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{
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if(Environment.OSVersion.Platform == PlatformID.Win32NT)
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{
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int flag = DirectoryExists(src) ? 0x1 : 0;
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WindowsNative.CreateSymbolicLinkFix(ConvertPathFromUnixPath(dest),ConvertPathFromUnixPath(src),flag);
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}else{
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Mono.Unix.Native.Syscall.symlink(ConvertPathFromUnixPath(src),ConvertPathFromUnixPath(dest));
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}
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}
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public override bool SymlinkExists(UnixPath file)
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{
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if(Environment.OSVersion.Platform == PlatformID.Win32NT)
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{
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return File.GetAttributes(ConvertPathFromUnixPath(file)).HasFlag(FileAttributes.ReparsePoint);
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}else{
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/* Mono.Unix.Native.Stat buf;
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if(Mono.Unix.Native.Syscall.stat(ConvertPathFromUnixPath(file),out buf) == 0)
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return buf.st_mode.HasFlag(Mono.Unix.Native.FilePermissions.S_IFLNK);*/
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return File.GetAttributes(ConvertPathFromUnixPath(file)).HasFlag(FileAttributes.ReparsePoint);
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}
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}
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private static class WindowsNative
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{
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[DllImport("kernel32.dll", EntryPoint = "CreateSymbolicLinkW", CharSet = CharSet.Unicode, SetLastError = true)]
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static extern int CreateSymbolicLink(string lpSymlinkFileName, string lpTargetFileName, int dwFlags);
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[DllImport("kernel32.dll", EntryPoint = "CreateHardLinkW", CharSet = CharSet.Unicode, SetLastError = true)]
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public static extern bool CreateHardlink(string lpSymlinkFileName, string lpTargetFileName, IntPtr dwFlags);
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public static int CreateSymbolicLinkFix(string lpSymlinkFileName, string lpTargetFileName, int dwFlags) {
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var result = CreateSymbolicLink(lpSymlinkFileName, lpTargetFileName, dwFlags);
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if (result == 1) return 0; // Success
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return Marshal.GetLastWin32Error();
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}
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private static readonly IntPtr INVALID_HANDLE_VALUE = new IntPtr(-1);
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private const uint FILE_READ_EA = 0x0008;
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private const uint FILE_FLAG_BACKUP_SEMANTICS = 0x2000000;
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[DllImport("Kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
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static extern uint GetFinalPathNameByHandle(IntPtr hFile, [MarshalAs(UnmanagedType.LPTStr)] StringBuilder lpszFilePath, uint cchFilePath, uint dwFlags);
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[DllImport("kernel32.dll", SetLastError = true)]
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[return: MarshalAs(UnmanagedType.Bool)]
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static extern bool CloseHandle(IntPtr hObject);
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[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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public static extern IntPtr CreateFile(
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[MarshalAs(UnmanagedType.LPTStr)] string filename,
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[MarshalAs(UnmanagedType.U4)] uint access,
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[MarshalAs(UnmanagedType.U4)] FileShare share,
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IntPtr securityAttributes, // optional SECURITY_ATTRIBUTES struct or IntPtr.Zero
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[MarshalAs(UnmanagedType.U4)] FileMode creationDisposition,
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[MarshalAs(UnmanagedType.U4)] uint flagsAndAttributes,
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IntPtr templateFile);
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public static string GetFinalPathName(string path)
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{
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var h = CreateFile(path,
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FILE_READ_EA,
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FileShare.ReadWrite | FileShare.Delete,
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IntPtr.Zero,
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FileMode.Open,
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FILE_FLAG_BACKUP_SEMANTICS,
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IntPtr.Zero);
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if (h == INVALID_HANDLE_VALUE)
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throw new Win32Exception();
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try
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{
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var sb = new StringBuilder(1024);
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var res = GetFinalPathNameByHandle(h, sb, 1024, 0);
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if (res == 0)
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throw new Win32Exception();
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return sb.ToString();
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}
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finally
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{
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CloseHandle(h);
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}
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}
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}
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public override bool CanWatch(UnixPath path)
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{
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return true;
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}
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public override UnixPath ReadLink(UnixPath file)
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{
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if(!SymlinkExists(file)) return file;
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if(Environment.OSVersion.Platform == PlatformID.Win32NT)
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{
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return ConvertPathToUnixPath(WindowsNative.GetFinalPathName(ConvertPathFromUnixPath(file)));
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}else{
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StringBuilder b=new StringBuilder(4096);
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if(Mono.Unix.Native.Syscall.readlink(ConvertPathFromUnixPath(file),b)>=0)
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{
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return ConvertPathToUnixPath(b.ToString());
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}
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}
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return file;
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}
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public override void SetLastWriteTime(UnixPath path, DateTime time)
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{
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if(FileExists(path))
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{
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File.SetLastWriteTime(ConvertPathFromUnixPath(path),time);
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}
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else
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{
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Directory.SetLastWriteTime(ConvertPathFromUnixPath(path),time);
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}
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}
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}
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}
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