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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#ifndef QT_TESTS_SHARED_FILESYSTEM_H_INCLUDED
#define QT_TESTS_SHARED_FILESYSTEM_H_INCLUDED
#include <QDir>
#include <QFile>
#include <QOperatingSystemVersion>
#include <QScopedPointer>
#include <QString>
#include <QStringList>
#include <QTemporaryDir>
#if defined(Q_OS_WIN)
#include <qt_windows.h>
#include <winioctl.h>
#ifndef IO_REPARSE_TAG_MOUNT_POINT
#define IO_REPARSE_TAG_MOUNT_POINT (0xA0000003L)
#endif
#define REPARSE_MOUNTPOINT_HEADER_SIZE 8
#ifndef FSCTL_SET_REPARSE_POINT
#define FSCTL_SET_REPARSE_POINT CTL_CODE(FILE_DEVICE_FILE_SYSTEM, 41, METHOD_BUFFERED, FILE_SPECIAL_ACCESS)
#endif
#ifndef SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE // MinGW
#define SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE (0x2)
#endif
QT_BEGIN_NAMESPACE
namespace QTest {
static QString uncServerName() { return qgetenv("COMPUTERNAME"); }
}
QT_END_NAMESPACE
#endif
// QTemporaryDir-based helper class for creating file-system hierarchies and cleaning up.
class FileSystem
{
Q_DISABLE_COPY(FileSystem)
public:
FileSystem() : m_temporaryDir(FileSystem::tempFilePattern()) {}
QString path() const { return m_temporaryDir.path(); }
QString absoluteFilePath(const QString &fileName) const { return path() + QLatin1Char('/') + fileName; }
bool createDirectory(const QString &relativeDirName)
{
if (m_temporaryDir.isValid()) {
QDir dir(m_temporaryDir.path());
return dir.mkpath(relativeDirName);
}
return false;
}
bool createFile(const QString &relativeFileName)
{
QScopedPointer<QFile> file(openFileForWrite(relativeFileName));
return !file.isNull();
}
qint64 createFileWithContent(const QString &relativeFileName)
{
QScopedPointer<QFile> file(openFileForWrite(relativeFileName));
return file.isNull() ? qint64(-1) : file->write(relativeFileName.toUtf8());
}
#if defined(Q_OS_WIN)
struct Result {
DWORD dwErr = ERROR_SUCCESS;
QString link;
QString target;
QString errorMessage;
};
static Result createSymbolicLink(const QString &symLinkName, const QString &target)
{
Result result;
const QString nativeSymLinkName = QDir::toNativeSeparators(symLinkName);
const QString nativeTarget = QDir::toNativeSeparators(target);
DWORD flags = 0;
if (QOperatingSystemVersion::current() >= QOperatingSystemVersion(QOperatingSystemVersion::Windows, 10, 0, 14972))
flags |= SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE;
if (QFileInfo(target).isDir())
flags |= SYMBOLIC_LINK_FLAG_DIRECTORY;
if (CreateSymbolicLink(reinterpret_cast<const wchar_t*>(nativeSymLinkName.utf16()),
reinterpret_cast<const wchar_t*>(nativeTarget.utf16()), flags) == FALSE) {
result.dwErr = GetLastError();
QTextStream(&result.errorMessage) << "CreateSymbolicLink(" << nativeSymLinkName << ", "
<< nativeTarget << ", 0x" << Qt::hex << flags << Qt::dec << ") failed with error "
<< result.dwErr << ": " << qt_error_string(int(result.dwErr));
} else {
result.link = nativeSymLinkName;
result.target = nativeTarget;
}
return result;
}
static Result createNtfsJunction(QString target, QString linkName)
{
typedef struct {
DWORD ReparseTag;
DWORD ReparseDataLength;
WORD Reserved;
WORD ReparseTargetLength;
WORD ReparseTargetMaximumLength;
WORD Reserved1;
WCHAR ReparseTarget[1];
} REPARSE_MOUNTPOINT_DATA_BUFFER, *PREPARSE_MOUNTPOINT_DATA_BUFFER;
char reparseBuffer[MAX_PATH*3];
HANDLE hFile;
DWORD returnedLength;
wchar_t fileSystem[MAX_PATH] = L"";
PREPARSE_MOUNTPOINT_DATA_BUFFER reparseInfo = (PREPARSE_MOUNTPOINT_DATA_BUFFER) reparseBuffer;
Result result;
QFileInfo junctionInfo(linkName);
linkName = QDir::toNativeSeparators(junctionInfo.absoluteFilePath());
const QString drive = linkName.left(3);
if (GetVolumeInformationW(reinterpret_cast<const wchar_t *>(drive.utf16()),
NULL, 0, NULL, NULL, NULL,
fileSystem, sizeof(fileSystem)/sizeof(WCHAR)) == FALSE) {
result.dwErr = GetLastError();
result.errorMessage = "GetVolumeInformationW() failed: " + qt_error_string(int(result.dwErr));
return result;
}
if (QString::fromWCharArray(fileSystem) != "NTFS") {
result.errorMessage = "This seems not to be an NTFS volume. Junctions are not allowed.";
result.dwErr = ERROR_NOT_SUPPORTED;
return result;
}
if (!target.startsWith("\\??\\") && !target.startsWith("\\\\?\\")) {
QFileInfo targetInfo(target);
target = QDir::toNativeSeparators(targetInfo.absoluteFilePath());
target.prepend("\\??\\");
if(target.endsWith('\\') && target.at(target.length()-2) != ':')
target.chop(1);
}
QDir().mkdir(linkName);
hFile = CreateFileW( (wchar_t*)linkName.utf16(), GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
FILE_FLAG_OPEN_REPARSE_POINT|FILE_FLAG_BACKUP_SEMANTICS, NULL );
if (hFile == INVALID_HANDLE_VALUE) {
result.dwErr = GetLastError();
result.errorMessage = "CreateFileW(" + linkName + ") failed: " + qt_error_string(int(result.dwErr));
return result;
}
memset( reparseInfo, 0, sizeof( *reparseInfo ));
reparseInfo->ReparseTag = IO_REPARSE_TAG_MOUNT_POINT;
reparseInfo->ReparseTargetLength = WORD(target.size()) * WORD(sizeof(wchar_t));
reparseInfo->ReparseTargetMaximumLength = reparseInfo->ReparseTargetLength + sizeof(wchar_t);
target.toWCharArray(reparseInfo->ReparseTarget);
reparseInfo->ReparseDataLength = reparseInfo->ReparseTargetLength + 12;
bool ioc = DeviceIoControl(hFile, FSCTL_SET_REPARSE_POINT, reparseInfo,
reparseInfo->ReparseDataLength + REPARSE_MOUNTPOINT_HEADER_SIZE,
NULL, 0, &returnedLength, NULL);
if (!ioc) {
result.dwErr = GetLastError();
result.errorMessage = "DeviceIoControl() failed: " + qt_error_string(int(result.dwErr));
} else {
result.link = linkName;
result.target = target;
}
CloseHandle( hFile );
return result;
}
#endif
private:
static QString tempFilePattern()
{
QString result = QDir::tempPath();
if (!result.endsWith(QLatin1Char('/')))
result.append(QLatin1Char('/'));
result += QStringLiteral("qt-test-filesystem-");
result += QCoreApplication::applicationName();
result += QStringLiteral("-XXXXXX");
return result;
}
QFile *openFileForWrite(const QString &fileName) const
{
if (m_temporaryDir.isValid()) {
const QString absName = absoluteFilePath(fileName);
std::unique_ptr<QFile> file(new QFile(absName));
if (file->open(QIODevice::WriteOnly))
return file.release();
qWarning("Cannot open '%s' for writing: %s", qPrintable(absName), qPrintable(file->errorString()));
}
return 0;
}
QTemporaryDir m_temporaryDir;
};
#endif // include guard
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