84 lines
3.4 KiB
C#
84 lines
3.4 KiB
C#
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// Copyright (c) .NET Foundation and contributors. All rights reserved.
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// Licensed under the MIT license. See LICENSE file in the project root for full license information.
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using Microsoft.Win32.SafeHandles;
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namespace Microsoft.DotNet.Tools.Test.Utilities
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{
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public sealed class DisposableFile : TempFile, IDisposable
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{
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public DisposableFile(string path)
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: base(path)
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{
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}
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public DisposableFile(string prefix = null, string extension = null, string directory = null, string callerSourcePath = null, int callerLineNumber = 0)
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: base(prefix, extension, directory, callerSourcePath, callerLineNumber)
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{
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}
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public void Dispose()
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{
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if (Path != null && File.Exists(Path))
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{
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try
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{
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File.Delete(Path);
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}
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catch (UnauthorizedAccessException)
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{
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try
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{
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// the file might still be memory-mapped, delete on close:
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DeleteFileOnClose(Path);
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}
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catch (IOException ex)
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{
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throw new InvalidOperationException(string.Format(@"
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The file '{0}' seems to have been opened in a way that prevents us from deleting it on close.
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Is the file loaded as an assembly (e.g. via Assembly.LoadFile)?
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{1}: {2}", Path, ex.GetType().Name, ex.Message), ex);
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}
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catch (UnauthorizedAccessException)
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{
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// We should ignore this exception if we got it the second time,
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// the most important reason is that the file has already been
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// scheduled for deletion and will be deleted when all handles
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// are closed.
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}
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}
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}
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}
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[DllImport("kernel32.dll", PreserveSig = false)]
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private static extern void SetFileInformationByHandle(SafeFileHandle handle, int fileInformationClass, ref uint fileDispositionInfoDeleteFile, int bufferSize);
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private const int FileDispositionInfo = 4;
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internal static void PrepareDeleteOnCloseStreamForDisposal(FileStream stream)
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{
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// tomat: Set disposition to "delete" on the stream, so to avoid ForeFront EndPoint
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// Protection driver scanning the file. Note that after calling this on a file that's open with DeleteOnClose,
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// the file can't be opened again, not even by the same process.
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uint trueValue = 1;
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SetFileInformationByHandle(stream.SafeFileHandle, FileDispositionInfo, ref trueValue, sizeof(uint));
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}
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/// <summary>
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/// Marks given file for automatic deletion when all its handles are closed.
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/// Note that after doing this the file can't be opened again, not even by the same process.
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/// </summary>
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internal static void DeleteFileOnClose(string fullPath)
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{
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using (var stream = new FileStream(fullPath, FileMode.Open, FileAccess.ReadWrite, FileShare.Delete | FileShare.ReadWrite, 8, FileOptions.DeleteOnClose))
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{
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PrepareDeleteOnCloseStreamForDisposal(stream);
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}
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}
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}
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}
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