File indexing completed on 2024-04-21 03:56:53

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 1999-2000 Waldo Bastian <bastian@kde.org>
     SPDX-FileCopyrightText: 2005-2009 David Faure <faure@kde.org>
     SPDX-FileCopyrightText: 2008 Hamish Rodda <rodda@kde.org>
     SPDX-FileCopyrightText: 2020-2022 Harald Sitter <sitter@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include "ksycoca.h"
 #include "ksycoca_p.h"
 #include "ksycocafactory_p.h"
 #include "ksycocatype.h"
 #include "ksycocautils_p.h"
 #include "sycocadebug.h"
 #include <KConfigGroup>
 #include <KSandbox>
 #include <KSharedConfig>
 
 #include <QCoreApplication>
 #include <QDataStream>
 #include <QFile>
 #include <QFileInfo>
 #include <QMetaMethod>
 #include <QStandardPaths>
 #include <QThread>
 #include <QThreadStorage>
 
 #include <QCryptographicHash>
 #include <fcntl.h>
 #include <kmimetypefactory_p.h>
 #include <kservicefactory_p.h>
 #include <kservicegroupfactory_p.h>
 
 #include "kbuildsycoca_p.h"
 #include "ksycocadevices_p.h"
 
 #ifdef Q_OS_UNIX
 #include <sys/time.h>
 #include <utime.h>
 #endif
 
 /**
  * Sycoca file version number.
  * If the existing file is outdated, it will not get read
  * but instead we'll regenerate a new one.
  * However running apps should still be able to read it, so
  * only add to the data, never remove/modify.
  */
 #define KSYCOCA_VERSION 305
 
 #if HAVE_MADVISE || HAVE_MMAP
 #include <sys/mman.h> // This #include was checked when looking for posix_madvise
 #endif
 
 #ifndef MAP_FAILED
 #define MAP_FAILED ((void *)-1)
 #endif
 
 QDataStream &operator>>(QDataStream &in, KSycocaHeader &h)
 {
     in >> h.prefixes >> h.timeStamp >> h.language >> h.updateSignature;
     return in;
 }
 
 // The following limitations are in place:
 // Maximum length of a single string: 8192 bytes
 // Maximum length of a string list: 1024 strings
 // Maximum number of entries: 8192
 //
 // The purpose of these limitations is to limit the impact
 // of database corruption.
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(KSycocaPrivate::BehaviorsIfNotFound)
 
 KSycocaPrivate::KSycocaPrivate(KSycoca *qq)
     : databaseStatus(DatabaseNotOpen)
     , readError(false)
     , timeStamp(0)
     , m_databasePath()
     , updateSig(0)
     , m_fileWatcher(new KDirWatch)
     , m_haveListeners(false)
     , q(qq)
     , sycoca_size(0)
     , sycoca_mmap(nullptr)
     , m_mmapFile(nullptr)
     , m_device(nullptr)
     , m_mimeTypeFactory(nullptr)
     , m_serviceFactory(nullptr)
     , m_serviceGroupFactory(nullptr)
 {
 #ifdef Q_OS_WIN
     /*
       on windows we use KMemFile (QSharedMemory) to avoid problems
       with mmap (can't delete a mmap'd file)
     */
     m_sycocaStrategy = StrategyMemFile;
 #else
     m_sycocaStrategy = StrategyMmap;
 #endif
     KConfigGroup config(KSharedConfig::openConfig(), QStringLiteral("KSycoca"));
     setStrategyFromString(config.readEntry("strategy"));
 }
 
 void KSycocaPrivate::setStrategyFromString(const QString &strategy)
 {
     if (strategy == QLatin1String("mmap")) {
         m_sycocaStrategy = StrategyMmap;
     } else if (strategy == QLatin1String("file")) {
         m_sycocaStrategy = StrategyFile;
     } else if (strategy == QLatin1String("sharedmem")) {
         m_sycocaStrategy = StrategyMemFile;
     } else if (!strategy.isEmpty()) {
         qCWarning(SYCOCA) << "Unknown sycoca strategy:" << strategy;
     }
 }
 
 bool KSycocaPrivate::tryMmap()
 {
 #if HAVE_MMAP
     Q_ASSERT(!m_databasePath.isEmpty());
     m_mmapFile = new QFile(m_databasePath);
     const bool canRead = m_mmapFile->open(QIODevice::ReadOnly);
     Q_ASSERT(canRead);
     if (!canRead) {
         return false;
     }
     fcntl(m_mmapFile->handle(), F_SETFD, FD_CLOEXEC);
     sycoca_size = m_mmapFile->size();
     void *mmapRet = mmap(nullptr, sycoca_size, PROT_READ, MAP_SHARED, m_mmapFile->handle(), 0);
     /* POSIX mandates only MAP_FAILED, but we are paranoid so check for
        null pointer too.  */
     if (mmapRet == MAP_FAILED || mmapRet == nullptr) {
         qCDebug(SYCOCA).nospace() << "mmap failed. (length = " << sycoca_size << ")";
         sycoca_mmap = nullptr;
         return false;
     } else {
         sycoca_mmap = static_cast<const char *>(mmapRet);
 #if HAVE_MADVISE
         (void)posix_madvise(mmapRet, sycoca_size, POSIX_MADV_WILLNEED);
 #endif // HAVE_MADVISE
         return true;
     }
 #else
     return false;
 #endif // HAVE_MMAP
 }
 
 int KSycoca::version()
 {
     return KSYCOCA_VERSION;
 }
 
 class KSycocaSingleton
 {
 public:
     KSycocaSingleton()
     {
     }
     ~KSycocaSingleton()
     {
     }
 
     bool hasSycoca() const
     {
         return m_threadSycocas.hasLocalData();
     }
     KSycoca *sycoca()
     {
         if (!m_threadSycocas.hasLocalData()) {
             m_threadSycocas.setLocalData(new KSycoca);
         }
         return m_threadSycocas.localData();
     }
     void setSycoca(KSycoca *s)
     {
         m_threadSycocas.setLocalData(s);
     }
 
 private:
     QThreadStorage<KSycoca *> m_threadSycocas;
 };
 
 Q_GLOBAL_STATIC(KSycocaSingleton, ksycocaInstance)
 
 QString KSycocaPrivate::findDatabase()
 {
     Q_ASSERT(databaseStatus == DatabaseNotOpen);
 
     const QString path = KSycoca::absoluteFilePath();
     const QFileInfo info(path);
     if (info.isReadable()) {
         if (m_haveListeners && m_fileWatcher) {
             m_fileWatcher->addFile(path);
         }
         return path;
     }
     // Let's be notified when it gets created - by another process or by ourselves
     if (m_fileWatcher) {
         m_fileWatcher->addFile(path);
     }
     return QString();
 }
 
 // Read-only constructor
 // One instance per thread
 KSycoca::KSycoca()
     : d(new KSycocaPrivate(this))
 {
     if (d->m_fileWatcher) {
         // We always delete and recreate the DB, so KDirWatch normally emits created
         connect(d->m_fileWatcher.get(), &KDirWatch::created, this, [this]() {
             d->slotDatabaseChanged();
         });
         // In some cases, KDirWatch only thinks the file was modified though
         connect(d->m_fileWatcher.get(), &KDirWatch::dirty, this, [this]() {
             d->slotDatabaseChanged();
         });
     }
 }
 
 bool KSycocaPrivate::openDatabase()
 {
     Q_ASSERT(databaseStatus == DatabaseNotOpen);
 
     delete m_device;
     m_device = nullptr;
 
     if (m_databasePath.isEmpty()) {
         m_databasePath = findDatabase();
     }
 
     bool result = true;
     if (!m_databasePath.isEmpty()) {
         static bool firstTime = true;
         if (firstTime) {
             firstTime = false;
             if (KSandbox::isFlatpak()) {
                 // We're running inside flatpak, which sets all times to 1970
                 // So the first very time, don't use an existing database, recreate it
                 qCDebug(SYCOCA) << "flatpak detected, ignoring" << m_databasePath;
                 return false;
             }
         }
 
         qCDebug(SYCOCA) << "Opening ksycoca from" << m_databasePath;
         m_dbLastModified = QFileInfo(m_databasePath).lastModified();
         result = checkVersion();
     } else { // No database file
         // qCDebug(SYCOCA) << "Could not open ksycoca";
         result = false;
     }
     return result;
 }
 
 KSycocaAbstractDevice *KSycocaPrivate::device()
 {
     if (m_device) {
         return m_device;
     }
 
     KSycocaAbstractDevice *device = m_device;
     Q_ASSERT(!m_databasePath.isEmpty());
 #if HAVE_MMAP
     if (m_sycocaStrategy == StrategyMmap && tryMmap()) {
         device = new KSycocaMmapDevice(sycoca_mmap, sycoca_size);
         if (!device->device()->open(QIODevice::ReadOnly)) {
             delete device;
             device = nullptr;
         }
     }
 #endif
 #ifndef QT_NO_SHAREDMEMORY
     if (!device && m_sycocaStrategy == StrategyMemFile) {
         device = new KSycocaMemFileDevice(m_databasePath);
         if (!device->device()->open(QIODevice::ReadOnly)) {
             delete device;
             device = nullptr;
         }
     }
 #endif
     if (!device) {
         device = new KSycocaFileDevice(m_databasePath);
         if (!device->device()->open(QIODevice::ReadOnly)) {
             qCWarning(SYCOCA) << "Couldn't open" << m_databasePath << "even though it is readable? Impossible.";
             // delete device; device = 0; // this would crash in the return statement...
         }
     }
     if (device) {
         m_device = device;
     }
     return m_device;
 }
 
 QDataStream *&KSycocaPrivate::stream()
 {
     if (!m_device) {
         if (databaseStatus == DatabaseNotOpen) {
             checkDatabase(KSycocaPrivate::IfNotFoundRecreate);
         }
 
         device(); // create m_device
     }
 
     return m_device->stream();
 }
 
 void KSycocaPrivate::slotDatabaseChanged()
 {
     qCDebug(SYCOCA) << QThread::currentThread() << "got a notifyDatabaseChanged signal";
     // In case we have changed the database outselves, we have already notified the application
     if (!m_dbLastModified.isValid() || m_dbLastModified != QFileInfo(m_databasePath).lastModified()) {
         // KDirWatch tells us the database file changed
         // We would have found out in the next call to ensureCacheValid(), but for
         // now keep the call to closeDatabase, to help refcounting to 0 the old mmapped file earlier.
         closeDatabase();
         // Start monitoring the new file right away
         m_databasePath = findDatabase();
 
         // Now notify applications
         Q_EMIT q->databaseChanged();
     }
 }
 
 KMimeTypeFactory *KSycocaPrivate::mimeTypeFactory()
 {
     if (!m_mimeTypeFactory) {
         m_mimeTypeFactory = new KMimeTypeFactory(q);
     }
     return m_mimeTypeFactory;
 }
 
 KServiceFactory *KSycocaPrivate::serviceFactory()
 {
     if (!m_serviceFactory) {
         m_serviceFactory = new KServiceFactory(q);
     }
     return m_serviceFactory;
 }
 
 KServiceGroupFactory *KSycocaPrivate::serviceGroupFactory()
 {
     if (!m_serviceGroupFactory) {
         m_serviceGroupFactory = new KServiceGroupFactory(q);
     }
     return m_serviceGroupFactory;
 }
 
 // Read-write constructor - only for KBuildSycoca
 KSycoca::KSycoca(bool /* dummy */)
     : d(new KSycocaPrivate(this))
 {
 }
 
 KSycoca *KSycoca::self()
 {
     KSycoca *s = ksycocaInstance()->sycoca();
     Q_ASSERT(s);
     return s;
 }
 
 KSycoca::~KSycoca()
 {
     d->closeDatabase();
     delete d;
     // if (ksycocaInstance.exists()
     //    && ksycocaInstance->self == this)
     //    ksycocaInstance->self = 0;
 }
 
 bool KSycoca::isAvailable() // TODO KF6: make it non-static (mostly useful for unittests)
 {
     return self()->d->checkDatabase(KSycocaPrivate::IfNotFoundDoNothing);
 }
 
 void KSycocaPrivate::closeDatabase()
 {
     delete m_device;
     m_device = nullptr;
 
     // It is very important to delete all factories here
     // since they cache information about the database file
     // But other threads might be using them, so this class is
     // refcounted, and deleted when the last thread is done with them
     qDeleteAll(m_factories);
     m_factories.clear();
 
     m_mimeTypeFactory = nullptr;
     m_serviceFactory = nullptr;
     m_serviceGroupFactory = nullptr;
 
 #if HAVE_MMAP
     if (sycoca_mmap) {
         // Solaris has munmap(char*, size_t) and everything else should
         // be happy with a char* for munmap(void*, size_t)
         munmap(const_cast<char *>(sycoca_mmap), sycoca_size);
         sycoca_mmap = nullptr;
     }
     delete m_mmapFile;
     m_mmapFile = nullptr;
 #endif
 
     databaseStatus = DatabaseNotOpen;
     m_databasePath.clear();
     timeStamp = 0;
 }
 
 void KSycoca::addFactory(KSycocaFactory *factory)
 {
     d->addFactory(factory);
 }
 
 QDataStream *KSycoca::findEntry(int offset, KSycocaType &type)
 {
     QDataStream *str = stream();
     Q_ASSERT(str);
     // qCDebug(SYCOCA) << QString("KSycoca::_findEntry(offset=%1)").arg(offset,8,16);
     str->device()->seek(offset);
     qint32 aType;
     *str >> aType;
     type = KSycocaType(aType);
     // qCDebug(SYCOCA) << QString("KSycoca::found type %1").arg(aType);
     return str;
 }
 
 KSycocaFactoryList *KSycoca::factories()
 {
     return d->factories();
 }
 
 // Warning, checkVersion rewinds to the beginning of stream().
 bool KSycocaPrivate::checkVersion()
 {
     QDataStream *m_str = device()->stream();
     Q_ASSERT(m_str);
     m_str->device()->seek(0);
     qint32 aVersion;
     *m_str >> aVersion;
     if (aVersion < KSYCOCA_VERSION) {
         qCDebug(SYCOCA) << "Found version" << aVersion << ", expecting version" << KSYCOCA_VERSION << "or higher.";
         databaseStatus = BadVersion;
         return false;
     } else {
         databaseStatus = DatabaseOK;
         return true;
     }
 }
 
 // If it returns true, we have a valid database and the stream has rewinded to the beginning
 // and past the version number.
 bool KSycocaPrivate::checkDatabase(BehaviorsIfNotFound ifNotFound)
 {
     if (databaseStatus == DatabaseOK) {
         if (checkVersion()) { // we know the version is ok, but we must rewind the stream anyway
             return true;
         }
     }
 
     closeDatabase(); // close the dummy one
 
     // Check if new database already available
     if (openDatabase()) {
         // Database exists, and version is ok, we can read it.
 
         if (qAppName() != QLatin1String(KBUILDSYCOCA_EXENAME) && ifNotFound != IfNotFoundDoNothing) {
             // Ensure it's up-to-date, rebuild if needed
             checkDirectories();
 
             // Don't check again for some time
             m_lastCheck.start();
         }
 
         return true;
     }
 
     if (ifNotFound & IfNotFoundRecreate) {
         return buildSycoca();
     }
 
     return false;
 }
 
 QDataStream *KSycoca::findFactory(KSycocaFactoryId id)
 {
     // Ensure we have a valid database (right version, and rewinded to beginning)
     if (!d->checkDatabase(KSycocaPrivate::IfNotFoundRecreate)) {
         return nullptr;
     }
 
     QDataStream *str = stream();
     Q_ASSERT(str);
 
     qint32 aId;
     qint32 aOffset;
     while (true) {
         *str >> aId;
         if (aId == 0) {
             qCWarning(SYCOCA) << "Error, KSycocaFactory (id =" << int(id) << ") not found!";
             break;
         }
         *str >> aOffset;
         if (aId == id) {
             // qCDebug(SYCOCA) << "KSycoca::findFactory(" << id << ") offset " << aOffset;
             str->device()->seek(aOffset);
             return str;
         }
     }
     return nullptr;
 }
 
 bool KSycoca::needsRebuild()
 {
     return d->needsRebuild();
 }
 
 KSycocaHeader KSycocaPrivate::readSycocaHeader()
 {
     KSycocaHeader header;
     // do not try to launch kbuildsycoca from here; this code is also called by kbuildsycoca.
     if (!checkDatabase(KSycocaPrivate::IfNotFoundDoNothing)) {
         return header;
     }
     QDataStream *str = stream();
     qint64 oldPos = str->device()->pos();
 
     Q_ASSERT(str);
     qint32 aId;
     qint32 aOffset;
     // skip factories offsets
     while (true) {
         *str >> aId;
         if (aId) {
             *str >> aOffset;
         } else {
             break; // just read 0
         }
     }
     // We now point to the header
     QStringList directoryList;
     *str >> header >> directoryList;
     allResourceDirs.clear();
     for (int i = 0; i < directoryList.count(); ++i) {
         qint64 mtime;
         *str >> mtime;
         allResourceDirs.insert(directoryList.at(i), mtime);
     }
 
     QStringList fileList;
     *str >> fileList;
     extraFiles.clear();
     for (const auto &fileName : std::as_const(fileList)) {
         qint64 mtime;
         *str >> mtime;
         extraFiles.insert(fileName, mtime);
     }
 
     str->device()->seek(oldPos);
 
     timeStamp = header.timeStamp;
 
     // for the useless public accessors. KF6: remove these two lines, the accessors and the vars.
     language = header.language;
     updateSig = header.updateSignature;
 
     return header;
 }
 
 class TimestampChecker
 {
 public:
     TimestampChecker()
         : m_now(QDateTime::currentDateTime())
     {
     }
 
     // Check times of last modification of all directories on which ksycoca depends,
     // If none of them is newer than the mtime we stored for that directory at the
     // last rebuild, this means that there's no need to rebuild ksycoca.
     bool checkDirectoriesTimestamps(const QMap<QString, qint64> &dirs) const
     {
         Q_ASSERT(!dirs.isEmpty());
         // qCDebug(SYCOCA) << "checking file timestamps";
         for (auto it = dirs.begin(); it != dirs.end(); ++it) {
             const QString dir = it.key();
             const qint64 lastStamp = it.value();
 
             auto visitor = [&](const QFileInfo &fi) {
                 const QDateTime mtime = fi.lastModified();
                 if (mtime.toMSecsSinceEpoch() > lastStamp) {
                     if (mtime > m_now) {
                         qCDebug(SYCOCA) << fi.filePath() << "has a modification time in the future" << mtime;
                     }
                     qCDebug(SYCOCA) << "dir timestamp changed:" << fi.filePath() << mtime << ">" << QDateTime::fromMSecsSinceEpoch(lastStamp);
                     // no need to continue search
                     return false;
                 }
 
                 return true;
             };
 
             if (!KSycocaUtilsPrivate::visitResourceDirectory(dir, visitor)) {
                 return false;
             }
         }
         return true;
     }
 
     bool checkFilesTimestamps(const QMap<QString, qint64> &files) const
     {
         for (auto it = files.begin(); it != files.end(); ++it) {
             const QString fileName = it.key();
             const qint64 lastStamp = it.value();
 
             QFileInfo fi(fileName);
             if (!fi.exists()) {
                 return false;
             }
             const QDateTime mtime = fi.lastModified();
             if (mtime.toMSecsSinceEpoch() > lastStamp) {
                 if (mtime > m_now) {
                     qCDebug(SYCOCA) << fi.filePath() << "has a modification time in the future" << mtime;
                 }
                 qCDebug(SYCOCA) << "file timestamp changed:" << fi.filePath() << mtime << ">" << QDateTime::fromMSecsSinceEpoch(lastStamp);
                 return false;
             }
         }
         return true;
     }
 
 private:
     QDateTime m_now;
 };
 
 void KSycocaPrivate::checkDirectories()
 {
     if (needsRebuild()) {
         buildSycoca();
     }
 }
 
 bool KSycocaPrivate::needsRebuild()
 {
     // In case it is not open, it might be due to another process/thread having rebuild it. Thus we read the header for both the not open and ok state
     if (!timeStamp && databaseStatus != BadVersion) {
         (void)readSycocaHeader();
     }
     // these days timeStamp is really a "bool headerFound", the value itself doesn't matter...
     // KF6: replace it with bool.
     const auto timestampChecker = TimestampChecker();
     bool ret = timeStamp != 0
         && (!timestampChecker.checkDirectoriesTimestamps(allResourceDirs) //
             || !timestampChecker.checkFilesTimestamps(extraFiles));
     if (ret) {
         return true;
     }
     auto files = KBuildSycoca::factoryExtraFiles();
     // ensure files are ordered so next comparison works
     files.sort();
     // to cover cases when extra files were added
     return extraFiles.keys() != files;
 }
 
 bool KSycocaPrivate::buildSycoca()
 {
     KBuildSycoca builder;
     if (!builder.recreate()) {
         return false; // error
     }
 
     closeDatabase(); // close the dummy one
 
     // Ok, the new database should be here now, open it.
     if (!openDatabase()) {
         qCDebug(SYCOCA) << "Still no database...";
         return false;
     }
     Q_EMIT q->databaseChanged();
     return true;
 }
 
 QString KSycoca::absoluteFilePath()
 {
     const QStringList paths = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation);
     QString suffix = QLatin1Char('_') + QLocale().bcp47Name();
 
     const QByteArray ksycoca_env = qgetenv("KDESYCOCA");
     if (ksycoca_env.isEmpty()) {
         const QByteArray pathHash = QCryptographicHash::hash(paths.join(QLatin1Char(':')).toUtf8(), QCryptographicHash::Sha1);
         suffix += QLatin1Char('_') + QString::fromLatin1(pathHash.toBase64());
         suffix.replace(QLatin1Char('/'), QLatin1Char('_'));
 #ifdef Q_OS_WIN
         suffix.replace(QLatin1Char(':'), QLatin1Char('_'));
 #endif
         const QString fileName = QLatin1String("ksycoca6") + suffix;
         return QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QLatin1Char('/') + fileName;
     } else {
         return QFile::decodeName(ksycoca_env);
     }
 }
 
 QStringList KSycoca::allResourceDirs()
 {
     if (!d->timeStamp) {
         (void)d->readSycocaHeader();
     }
     return d->allResourceDirs.keys();
 }
 
 void KSycoca::flagError()
 {
     qCWarning(SYCOCA) << "ERROR: KSycoca database corruption!";
     KSycoca *sycoca = self();
     if (sycoca->d->readError) {
         return;
     }
     sycoca->d->readError = true;
     if (qAppName() != QLatin1String(KBUILDSYCOCA_EXENAME) && !sycoca->isBuilding()) {
         // Rebuild the damned thing.
         KBuildSycoca builder;
         (void)builder.recreate();
     }
 }
 
 bool KSycoca::isBuilding()
 {
     return false;
 }
 
 void KSycoca::disableAutoRebuild()
 {
     ksycocaInstance->sycoca()->d->m_fileWatcher = nullptr;
 }
 
 QDataStream *&KSycoca::stream()
 {
     return d->stream();
 }
 
 void KSycoca::connectNotify(const QMetaMethod &signal)
 {
     if (signal.name() == "databaseChanged" && !d->m_haveListeners) {
         d->m_haveListeners = true;
         if (d->m_databasePath.isEmpty()) {
             d->m_databasePath = d->findDatabase();
         } else if (d->m_fileWatcher) {
             d->m_fileWatcher->addFile(d->m_databasePath);
         }
     }
 }
 
 void KSycoca::clearCaches()
 {
     if (ksycocaInstance.exists() && ksycocaInstance()->hasSycoca()) {
         ksycocaInstance()->sycoca()->d->closeDatabase();
     }
 }
 
 extern KSERVICE_EXPORT int ksycoca_ms_between_checks;
 KSERVICE_EXPORT int ksycoca_ms_between_checks = 1500;
 
 void KSycoca::ensureCacheValid()
 {
     if (qAppName() == QLatin1String(KBUILDSYCOCA_EXENAME)) {
         return;
     }
 
     if (d->databaseStatus != KSycocaPrivate::DatabaseOK) {
         if (!d->checkDatabase(KSycocaPrivate::IfNotFoundRecreate)) {
             return;
         }
     }
 
     if (d->m_lastCheck.isValid() && d->m_lastCheck.elapsed() < ksycoca_ms_between_checks) {
         return;
     }
     d->m_lastCheck.start();
 
     // Check if the file on disk was modified since we last checked it.
     QFileInfo info(d->m_databasePath);
     if (info.lastModified() == d->m_dbLastModified) {
         // Check if the watched directories were modified, then the cache needs a rebuild.
         d->checkDirectories();
         return;
     }
 
     // Close the database and forget all about what we knew.
     // The next call to any public method will recreate
     // everything that's needed.
     d->closeDatabase();
 }
 
 void KSycoca::setupTestMenu()
 {
     const QByteArray content = R"(<?xml version="1.0"?>
 <!DOCTYPE Menu PUBLIC "-//freedesktop//DTD Menu 1.0//EN" "http://www.freedesktop.org/standards/menu-spec/menu-1.0.dtd">
 <Menu>
   <Name>Applications</Name>
   <Directory>Applications.directory</Directory>
   <DefaultAppDirs/>
   <DefaultDirectoryDirs/>
   <MergeDir>applications-merged</MergeDir>
   <LegacyDir>/usr/share/applnk</LegacyDir>
   <DefaultLayout>
     <Merge type="menus"/>
     <Merge type="files"/>
     <Separator/>
     <Menuname>More</Menuname>
   </DefaultLayout>
 </Menu>
 )";
 
     const QString destDir = QStandardPaths::writableLocation(QStandardPaths::GenericConfigLocation) + QLatin1String("/menus");
     QDir(destDir).mkpath(QStringLiteral("."));
     QFile output(destDir + QLatin1String("/applications.menu"));
     output.open(QIODevice::ReadWrite | QIODevice::Truncate);
     output.write(content);
 }
 
 #include "moc_ksycoca.cpp"