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ShadowCopyManager.cs
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ShadowCopyManager.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Globalization;
namespace Microsoft.NET.Sdk.Razor.Tool
{
// Note that this class has no thread-safety guarantees. The caller should use a lock
// if concurrency is required.
internal class ShadowCopyManager : IDisposable
{
// Note that this class uses the *existance* of the Mutex to lock a directory.
//
// Nothing in this code actually ever acquires the Mutex, we just try to see if it exists
// already.
private readonly Mutex _mutex;
private int _counter;
public ShadowCopyManager(string baseDirectory = null)
{
BaseDirectory = baseDirectory ?? Path.Combine(Path.GetTempPath(), "Razor", "ShadowCopy");
var guid = Guid.NewGuid().ToString("N").ToLowerInvariant();
UniqueDirectory = Path.Combine(BaseDirectory, guid);
_mutex = new Mutex(initiallyOwned: false, name: guid);
Directory.CreateDirectory(UniqueDirectory);
}
public string BaseDirectory { get; }
public string UniqueDirectory { get; }
public string AddAssembly(string filePath)
{
var assemblyDirectory = CreateUniqueDirectory();
var destination = Path.Combine(assemblyDirectory, Path.GetFileName(filePath));
CopyFile(filePath, destination);
var fileNameWithoutExtension = Path.GetFileNameWithoutExtension(filePath);
var resourcesNameWithoutExtension = fileNameWithoutExtension + ".resources";
var resourcesNameWithExtension = resourcesNameWithoutExtension + ".dll";
foreach (var directory in Directory.EnumerateDirectories(Path.GetDirectoryName(filePath)))
{
var directoryName = Path.GetFileName(directory);
var resourcesPath = Path.Combine(directory, resourcesNameWithExtension);
if (File.Exists(resourcesPath))
{
var resourcesShadowCopyPath = Path.Combine(assemblyDirectory, directoryName, resourcesNameWithExtension);
CopyFile(resourcesPath, resourcesShadowCopyPath);
}
resourcesPath = Path.Combine(directory, resourcesNameWithoutExtension, resourcesNameWithExtension);
if (File.Exists(resourcesPath))
{
var resourcesShadowCopyPath = Path.Combine(assemblyDirectory, directoryName, resourcesNameWithoutExtension, resourcesNameWithExtension);
CopyFile(resourcesPath, resourcesShadowCopyPath);
}
}
return destination;
}
public void Dispose()
{
_mutex.ReleaseMutex();
}
public Task PurgeUnusedDirectoriesAsync()
{
return Task.Run((Action)PurgeUnusedDirectories);
}
private string CreateUniqueDirectory()
{
var id = _counter++;
var directory = Path.Combine(UniqueDirectory, id.ToString(CultureInfo.InvariantCulture));
Directory.CreateDirectory(directory);
return directory;
}
private void CopyFile(string originalPath, string shadowCopyPath)
{
var directory = Path.GetDirectoryName(shadowCopyPath);
Directory.CreateDirectory(directory);
File.Copy(originalPath, shadowCopyPath);
MakeWritable(new FileInfo(shadowCopyPath));
}
private void MakeWritable(string directoryPath)
{
var directory = new DirectoryInfo(directoryPath);
foreach (var file in directory.EnumerateFiles(searchPattern: "*", searchOption: SearchOption.AllDirectories))
{
MakeWritable(file);
}
}
private void MakeWritable(FileInfo file)
{
try
{
if (file.IsReadOnly)
{
file.IsReadOnly = false;
}
}
catch
{
// There are many reasons this could fail. Ignore it and keep going.
}
}
private void PurgeUnusedDirectories()
{
IEnumerable<string> directories;
try
{
directories = Directory.EnumerateDirectories(BaseDirectory);
}
catch (DirectoryNotFoundException)
{
return;
}
foreach (var directory in directories)
{
Mutex mutex = null;
try
{
// We only want to try deleting the directory if no-one else is currently using it.
//
// Note that the mutex name is the name of the directory. This is OK because we're using
// GUIDs as directory/mutex names.
if (!Mutex.TryOpenExisting(Path.GetFileName(directory).ToLowerInvariant(), out mutex))
{
MakeWritable(directory);
Directory.Delete(directory, recursive: true);
}
}
catch
{
// If something goes wrong we will leave it to the next run to clean up.
// Just swallow the exception and move on.
}
finally
{
if (mutex != null)
{
mutex.Dispose();
}
}
}
}
}
}