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Code Issues Releases Wiki Activity

Fixed: Workaround for mono 6.x file copy/move issues

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This commit is contained in:
Taloth Saldono 2020-02-10 22:13:08 +01:00
parent 9ac0864b61
commit e7b88c313d
1 changed files with 119 additions and 1 deletions
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120
src/NzbDrone.Mono/Disk/DiskProvider.cs
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@ -7,6 +7,7 @@ using Mono.Unix.Native;
using NLog;
using NzbDrone.Common.Disk;
using NzbDrone.Common.EnsureThat;
using NzbDrone.Common.EnvironmentInfo;
using NzbDrone.Common.Extensions;
using NzbDrone.Common.Instrumentation;
@ -16,6 +17,7 @@ namespace NzbDrone.Mono.Disk
{
private static readonly Logger Logger = NzbDroneLogger.GetLogger(typeof(DiskProvider));
private readonly Logger _logger;
private readonly IProcMountProvider _procMountProvider;
private readonly ISymbolicLinkResolver _symLinkResolver;
@ -23,10 +25,11 @@ namespace NzbDrone.Mono.Disk
// `unchecked((uint)-1)` and `uint.MaxValue` are the same thing.
private const uint UNCHANGED_ID = uint.MaxValue;
public DiskProvider(IProcMountProvider procMountProvider, ISymbolicLinkResolver symLinkResolver)
public DiskProvider(IProcMountProvider procMountProvider, ISymbolicLinkResolver symLinkResolver, Logger logger)
{
_procMountProvider = procMountProvider;
_symLinkResolver = symLinkResolver;
_logger = logger;
}
public override IMount GetMount(string path)
@ -166,6 +169,10 @@ namespace NzbDrone.Mono.Disk
newFile.CreateSymbolicLinkTo(fullPath);
}
}
else if (PlatformInfo.GetVersion() > new Version(6, 0) && (!FileExists(destination) || overwrite))
{
TransferFilePatched(source, destination, overwrite, false);
}
else
{
base.CopyFileInternal(source, destination, overwrite);
@ -207,11 +214,122 @@ namespace NzbDrone.Mono.Disk
throw;
}
}
else if (PlatformInfo.GetVersion() > new Version(6, 0) && !FileExists(destination))
{
TransferFilePatched(source, destination, false, true);
}
else
{
base.MoveFileInternal(source, destination);
}
}
private void TransferFilePatched(string source, string destination, bool overwrite, bool move)
{
// Mono 6.x throws errors if permissions or timestamps cannot be set
// - In 6.0 it'll leave a full length file
// - In 6.6 it'll leave a zero length file
// Catch the exception and attempt to handle these edgecases
try
{
if (move)
{
base.MoveFileInternal(source, destination);
}
else
{
base.CopyFileInternal(source, destination, overwrite);
}
}
catch (UnauthorizedAccessException)
{
var srcInfo = new FileInfo(source);
var dstInfo = new FileInfo(destination);
var exists = dstInfo.Exists && srcInfo.Exists;
if (exists && dstInfo.Length == 0 && srcInfo.Length != 0)
{
// mono >=6.6 bug: zero length file since chmod happens at the start
_logger.Debug("Mono failed to {2} file likely due to known mono bug, attempting to {2} directly. '{0}' -> '{1}'", source, destination, move ? "move" : "copy");
try
{
_logger.Trace("Copying content from {0} to {1} ({2} bytes)", source, destination, srcInfo.Length);
using (var srcStream = new FileStream(source, FileMode.Open, FileAccess.Read))
using (var dstStream = new FileStream(destination, FileMode.Create, FileAccess.Write))
{
srcStream.CopyTo(dstStream);
}
}
catch
{
// If it fails again then bail
throw;
}
}
else if (exists && dstInfo.Length == srcInfo.Length)
{
// mono 6.0, 6.4 bug: full length file since utime and chmod happens at the end
_logger.Debug("Mono failed to {2} file likely due to known mono bug, attempting to {2} directly. '{0}' -> '{1}'", source, destination, move ? "move" : "copy");
// Check at least part of the file since UnauthorizedAccess can happen due to legitimate reasons too
var checkLength = (int)Math.Min(64 * 1024, dstInfo.Length);
if (checkLength > 0)
{
var srcData = new byte[checkLength];
var dstData = new byte[checkLength];
_logger.Trace("Check last {0} bytes from {1}", checkLength, destination);
using (var srcStream = new FileStream(source, FileMode.Open, FileAccess.Read))
using (var dstStream = new FileStream(destination, FileMode.Open, FileAccess.Read))
{
srcStream.Position = srcInfo.Length - checkLength;
dstStream.Position = dstInfo.Length - checkLength;
srcStream.Read(srcData, 0, checkLength);
dstStream.Read(dstData, 0, checkLength);
}
for (var i = 0; i < checkLength; i++)
{
if (srcData[i] != dstData[i])
{
// Files aren't the same, the UnauthorizedAccess was unrelated
_logger.Trace("Copy was incomplete, rethrowing original error");
throw;
}
}
_logger.Trace("Copy was complete, finishing {0} operation", move ? "move" : "copy");
}
}
else
{
// Unrecognized situation, the UnauthorizedAccess was unrelated
throw;
}
if (exists)
{
try
{
dstInfo.LastWriteTimeUtc = srcInfo.LastWriteTimeUtc;
}
catch
{
_logger.Debug("Unable to change last modified date for {0}, skipping.", destination);
}
if (move)
{
_logger.Trace("Removing source file {0}", source);
File.Delete(source);
}
}
}
}
public override bool TryCreateHardLink(string source, string destination)
{