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Handle Move/Copy to same file via different mount/symlink

This commit is contained in:
Taloth Saldono 2020-09-26 22:55:57 +02:00
parent 6134aa38eb
commit 0f4e699b57
1 changed files with 79 additions and 7 deletions
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82
src/NzbDrone.Common/Disk/DiskTransferService.cs
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@ -245,15 +245,17 @@ namespace NzbDrone.Common.Disk
_logger.Debug("{0} [{1}] > [{2}]", mode, sourcePath, targetPath);
var originalSize = _diskProvider.GetFileSize(sourcePath);
if (sourcePath == targetPath)
{
throw new IOException(string.Format("Source and destination can't be the same {0}", sourcePath));
}
var originalSize = _diskProvider.GetFileSize(sourcePath);
if (sourcePath.PathEquals(targetPath, StringComparison.InvariantCultureIgnoreCase))
{
// Shortcut for dealing with inplace rename
if (mode.HasFlag(TransferMode.HardLink) || mode.HasFlag(TransferMode.Copy))
{
throw new IOException(string.Format("Source and destination can't be the same {0}", sourcePath));
@ -266,7 +268,7 @@ namespace NzbDrone.Common.Disk
_diskProvider.MoveFile(sourcePath, tempPath, true);
try
{
ClearTargetPath(sourcePath, targetPath, overwrite);
ClearTargetPath(targetPath, overwrite);
_diskProvider.MoveFile(tempPath, targetPath);
@ -296,7 +298,77 @@ namespace NzbDrone.Common.Disk
throw new IOException(string.Format("Destination cannot be a child of the source [{0}] => [{1}]", sourcePath, targetPath));
}
ClearTargetPath(sourcePath, targetPath, overwrite);
var targetFileExists = _diskProvider.FileExists(targetPath);
var targetFilePotentiallySame = targetFileExists && Path.GetFileName(sourcePath).EqualsIgnoreCase(Path.GetFileName(targetPath)) && _diskProvider.GetFileSize(targetPath) == originalSize;
// If the target file exists and has the same name ans size then it _could_ be that they're actually pointing to the same actual file via softlinks.
// This is reasonably easy to determine in linux, but on windows it's more tricky.
// Depending on 'overwrite' and Move/Copy we have to take different actions.
if (targetFileExists)
{
if (targetFilePotentiallySame)
{
var targetBackupPath = targetPath + ".backup~";
if (mode.HasFlag(TransferMode.HardLink) || mode.HasFlag(TransferMode.Copy))
{
// Copy doesn't allow renames, only overwrite
if (!overwrite)
{
throw new DestinationAlreadyExistsException($"Destination {targetPath} already exists.");
}
_diskProvider.MoveFile(targetPath, targetBackupPath, true);
if (!_diskProvider.FileExists(sourcePath))
{
// They were the same file, Copy/Hardlink can't handle that, so revert and throw
// Note that on windows this can actually cause the casing to change
_diskProvider.MoveFile(targetBackupPath, targetPath);
throw new IOException(string.Format("Source and destination can't be the same {0}", sourcePath));
}
}
else if (mode.HasFlag(TransferMode.Move))
{
// Move allows a rename of same file, or overwrite different file
_diskProvider.MoveFile(targetPath, targetBackupPath, true);
if (!_diskProvider.FileExists(sourcePath))
{
// They were the same file, treat this as if it's a rename in place
_diskProvider.MoveFile(targetBackupPath, targetPath);
return TransferMode.Move;
}
else
{
// They were different files, only allow the move if overwrite is enabled, otherwise revert and throw
if (overwrite)
{
_diskProvider.DeleteFile(targetBackupPath);
}
else
{
_diskProvider.MoveFile(targetBackupPath, targetPath);
throw new DestinationAlreadyExistsException($"Destination {targetPath} already exists.");
}
}
}
else
{
return TransferMode.None;
}
}
else
{
if (!overwrite)
{
throw new DestinationAlreadyExistsException($"Destination {targetPath} already exists.");
}
_diskProvider.DeleteFile(targetPath);
}
}
if (mode.HasFlag(TransferMode.HardLink))
{
@ -371,7 +443,7 @@ namespace NzbDrone.Common.Disk
return TransferMode.None;
}
private void ClearTargetPath(string sourcePath, string targetPath, bool overwrite)
private void ClearTargetPath(string targetPath, bool overwrite)
{
if (_diskProvider.FileExists(targetPath))
{