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FileSystemTest.cs
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FileSystemTest.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.Collections.Generic;
using System.Diagnostics;
using Microsoft.DotNet.XUnitExtensions;
using Xunit;
namespace System.IO.Tests
{
public abstract partial class FileSystemTest : FileCleanupTestBase
{
public static readonly byte[] TestBuffer = { 0xBA, 0x5E, 0xBA, 0x11, 0xF0, 0x07, 0xBA, 0x11 };
public static bool AreAllLongPathsAvailable => PathFeatures.AreAllLongPathsAvailable();
public static bool LongPathsAreNotBlocked => !PathFeatures.AreLongPathsBlocked();
public static bool UsingNewNormalization => !PathFeatures.IsUsingLegacyPathNormalization();
public static bool ReservedDeviceNamesAreBlocked => PlatformDetection.IsWindows && !PlatformDetection.IsWindows10OrLater;
public static TheoryData<string> PathsWithInvalidColons = TestData.PathsWithInvalidColons;
public static TheoryData<string> PathsWithInvalidCharacters = TestData.PathsWithInvalidCharacters;
public static TheoryData<char> TrailingCharacters = TestData.TrailingCharacters;
public static TheoryData ValidPathComponentNames = IOInputs.GetValidPathComponentNames().ToTheoryData();
public static TheoryData SimpleWhiteSpace = IOInputs.GetSimpleWhiteSpace().ToTheoryData();
public static TheoryData WhiteSpace = IOInputs.GetWhiteSpace().ToTheoryData();
public static TheoryData UncPathsWithoutShareName = IOInputs.GetUncPathsWithoutShareName().ToTheoryData();
public static TheoryData PathsWithReservedDeviceNames = IOInputs.GetPathsWithReservedDeviceNames().ToTheoryData();
public static TheoryData PathsWithColons = IOInputs.GetPathsWithColons().ToTheoryData();
public static TheoryData PathsWithComponentLongerThanMaxComponent = IOInputs.GetPathsWithComponentLongerThanMaxComponent().ToTheoryData();
public static TheoryData ControlWhiteSpace = IOInputs.GetControlWhiteSpace().ToTheoryData();
public static TheoryData NonControlWhiteSpace = IOInputs.GetNonControlWhiteSpace().ToTheoryData();
public static TheoryData<string> TrailingSeparators
{
get
{
var data = new TheoryData<string>()
{
"",
"" + Path.DirectorySeparatorChar,
"" + Path.DirectorySeparatorChar + Path.DirectorySeparatorChar
};
if (PlatformDetection.IsWindows)
{
data.Add("" + Path.AltDirectorySeparatorChar);
}
return data;
}
}
/// <summary>
/// Do a test action against read only file system (for Unix).
/// </summary>
/// <param name="testAction">Test action to perform. The string argument will be read only directory.</param>
/// <param name="subDirectoryName">Optional subdirectory to create.</param>
protected void ReadOnly_FileSystemHelper(Action<string> testAction, string subDirectoryName = null)
{
// Set up read only file system
// Set up the source directory
string sourceDirectory = GetTestFilePath();
if (subDirectoryName == null)
{
Directory.CreateDirectory(sourceDirectory);
}
else
{
string sourceSubDirectory = Path.Combine(sourceDirectory, subDirectoryName);
Directory.CreateDirectory(sourceSubDirectory);
}
// Set up the target directory and mount as a read only
string readOnlyDirectory = GetTestFilePath();
Directory.CreateDirectory(readOnlyDirectory);
Assert.Equal(0, AdminHelpers.RunAsSudo($"mount --bind {sourceDirectory} {readOnlyDirectory}"));
try
{
Assert.Equal(0, AdminHelpers.RunAsSudo($"mount -o remount,ro,bind {sourceDirectory} {readOnlyDirectory}"));
testAction(readOnlyDirectory);
}
finally
{
// Clean up test environment
Assert.Equal(0, AdminHelpers.RunAsSudo($"umount {readOnlyDirectory}"));
}
}
/// <summary>
/// Determines whether the file system is case sensitive by creating a file in the specified folder and observing the result.
/// </summary>
/// <remarks>
/// Ideally we'd use something like pathconf with _PC_CASE_SENSITIVE, but that is non-portable,
/// not supported on Windows or Linux, etc. For now, this function creates a tmp file with capital letters
/// and then tests for its existence with lower-case letters. This could return invalid results in corner
/// cases where, for example, different file systems are mounted with differing sensitivities.
/// </remarks>
protected static bool GetIsCaseSensitiveByProbing(string probingDirectory)
{
string pathWithUpperCase = Path.Combine(probingDirectory, $"CASESENSITIVETEST{Guid.NewGuid():N}");
using (new FileStream(pathWithUpperCase, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.None, 0x1000, FileOptions.DeleteOnClose))
{
string lowerCased = pathWithUpperCase.ToLowerInvariant();
return !File.Exists(lowerCased);
}
}
protected const UnixFileMode AllAccess =
UnixFileMode.UserRead |
UnixFileMode.UserWrite |
UnixFileMode.UserExecute |
UnixFileMode.GroupRead |
UnixFileMode.GroupWrite |
UnixFileMode.GroupExecute |
UnixFileMode.OtherRead |
UnixFileMode.OtherWrite |
UnixFileMode.OtherExecute;
public static IEnumerable<object[]> TestUnixFileModes
{
get
{
// Make combinations of the enum with 0, 1 and 2 bits set.
UnixFileMode[] modes = Enum.GetValues<UnixFileMode>();
for (int i = 0; i < modes.Length; i++)
{
for (int j = i; j < modes.Length; j++)
{
yield return new object[] { modes[i] | modes[j] };
}
}
}
}
private static UnixFileMode s_umask = (UnixFileMode)(-1);
protected static UnixFileMode GetUmask()
{
if (s_umask == (UnixFileMode)(-1))
{
// The umask can't be retrieved without changing it.
// We launch a child process to get its value.
using Process px = Process.Start(new ProcessStartInfo
{
FileName = "/bin/sh",
ArgumentList = { "-c", "umask" },
RedirectStandardOutput = true
});
string stdout = px.StandardOutput.ReadToEnd().Trim();
s_umask = (UnixFileMode)Convert.ToInt32(stdout, 8);
}
return s_umask;
}
}
}