Tyler Gill
08e0708a95
This is inspired largely by the new (/ returning) feature of OneDrive in Windows 10 Fall Creator's Update, which downloads files on-demand. A side effect of that change is that the OneDrive folder (and subfolders of it) are marked as reparse points, even though they are not technically standard symlinks. With this change, a new extension method IsSymlink is added for ISnapshotService and ISystemIO, which checks both the file attributes (for reparse point) and the symlink target path (if null, the path is not treated as a symlink). All places that previously checked only the file attributes have been updated to use either this method (or at least the same logic, in the case of the core BackupHandler file check). One side effect of this change is that '--symlink-policy=store' no longer ignores empty symlinks - they are now treated as regular files. If there are empty symlinks, they will now be backed up as if they were regular files, but I don't know what the conditions are that create symlinks like that, so this might not effect anything in practice.
98 lines
3.7 KiB
C#
98 lines
3.7 KiB
C#
// Copyright (C) 2015, The Duplicati Team
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// http://www.duplicati.com, info@duplicati.com
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Text;
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using System.Collections.Generic;
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namespace Duplicati.Library.Snapshots
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{
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/// <summary>
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/// Handler for providing a snapshot like access to files and folders
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/// </summary>
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public class NoSnapshotLinux : NoSnapshot
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{
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private readonly SystemIOLinux _sysIO = new SystemIOLinux();
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public NoSnapshotLinux(string[] sourcefolders)
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: base(sourcefolders)
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{
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}
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public NoSnapshotLinux(string[] sourcefolders, Dictionary<string, string> options)
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: base(sourcefolders, options)
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{
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}
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/// <summary>
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/// Returns the symlink target if the entry is a symlink, and null otherwise
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/// </summary>
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/// <param name="file">The file or folder to examine</param>
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/// <returns>The symlink target</returns>
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public override string GetSymlinkTarget(string file)
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{
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return _sysIO.GetSymlinkTarget(file);
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}
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/// <summary>
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/// Gets the metadata for the given file or folder
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/// </summary>
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/// <returns>The metadata for the given file or folder</returns>
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/// <param name="file">The file or folder to examine</param>
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/// <param name="isSymlink">A flag indicating if the target is a symlink</param>
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/// <param name="followSymlink">A flag indicating if a symlink should be followed</param>
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public override Dictionary<string, string> GetMetadata(string file, bool isSymlink, bool followSymlink)
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{
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return _sysIO.GetMetadata(file, isSymlink, followSymlink);
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}
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/// <summary>
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/// Gets a value indicating if the path points to a block device
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/// </summary>
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/// <returns><c>true</c> if this instance is a block device; otherwise, <c>false</c>.</returns>
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/// <param name="file">The file or folder to examine</param>
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public override bool IsBlockDevice(string file)
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{
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var n = UnixSupport.File.GetFileType(NormalizePath(file));
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switch (n)
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{
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case UnixSupport.File.FileType.Directory:
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case UnixSupport.File.FileType.Symlink:
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case UnixSupport.File.FileType.File:
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return false;
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default:
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return true;
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}
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}
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/// <summary>
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/// Gets a unique hardlink target ID
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/// </summary>
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/// <returns>The hardlink ID</returns>
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/// <param name="path">The file or folder to examine</param>
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public override string HardlinkTargetID(string path)
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{
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path = NormalizePath(path);
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if (UnixSupport.File.GetHardlinkCount(path) <= 1)
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return null;
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return UnixSupport.File.GetInodeTargetID(path);
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}
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}
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}
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