File indexing completed on 2024-04-28 15:29:54

 /*
     This file is part of the KDE libraries
     SPDX-FileCopyrightText: 1999 David Faure <faure@kde.org>
     SPDX-FileCopyrightText: 2002-2003 Waldo Bastian <bastian@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-only
 */
 
 #include "kbuildsycoca_p.h"
 #include "ksycoca_p.h"
 #include "ksycocaresourcelist_p.h"
 #include "ksycocautils_p.h"
 #include "sycocadebug.h"
 #include "vfolder_menu_p.h"
 
 #include "kbuildmimetypefactory_p.h"
 #include "kbuildservicefactory_p.h"
 #include "kbuildservicegroupfactory_p.h"
 #include "kbuildservicetypefactory_p.h"
 #include "kctimefactory_p.h"
 #include <QDataStream>
 #include <QDateTime>
 #include <QDebug>
 #include <QDir>
 #include <QDirIterator>
 #include <QEventLoop>
 #include <QFile>
 #include <QLocale>
 #include <QSaveFile>
 #include <QTimer>
 #include <config-ksycoca.h>
 #include <kservice.h>
 #include <kservicegroup.h>
 
 #include <kmemfile_p.h>
 
 #include <QLockFile>
 #include <QStandardPaths>
 #include <memory> // auto_ptr
 #include <qplatformdefs.h>
 #include <time.h>
 
 static const char *s_cSycocaPath = nullptr;
 
 KBuildSycocaInterface::~KBuildSycocaInterface()
 {
 }
 
 KBuildSycoca::KBuildSycoca()
     : KSycoca(true)
     , m_allEntries(nullptr)
     , m_ctimeFactory(nullptr)
     , m_ctimeDict(nullptr)
     , m_currentEntryDict(nullptr)
     , m_serviceGroupEntryDict(nullptr)
     , m_vfolder(nullptr)
     , m_newTimestamp(0)
     , m_menuTest(false)
     , m_changed(false)
 {
 }
 
 KBuildSycoca::~KBuildSycoca()
 {
     // Delete the factories while we exist, so that the virtual isBuilding() still works
     qDeleteAll(*factories());
     factories()->clear();
 }
 
 KSycocaEntry::Ptr KBuildSycoca::createEntry(KSycocaFactory *currentFactory, const QString &file)
 {
     quint32 timeStamp = m_ctimeFactory->dict()->ctime(file, m_resource);
     if (!timeStamp) {
         timeStamp = calcResourceHash(m_resourceSubdir, file);
         if (!timeStamp) { // file disappeared meanwhile
             return {};
         }
     }
     KSycocaEntry::Ptr entry;
     if (m_allEntries) {
         Q_ASSERT(m_ctimeDict);
         quint32 oldTimestamp = m_ctimeDict->ctime(file, m_resource);
         if (file.contains(QLatin1String("fake"))) {
             qCDebug(SYCOCA) << "m_ctimeDict->ctime(" << file << ") = " << oldTimestamp << "compared with" << timeStamp;
         }
 
         if (timeStamp && (timeStamp == oldTimestamp)) {
             // Re-use old entry
             if (currentFactory == d->m_serviceFactory) { // Strip .directory from service-group entries
                 entry = m_currentEntryDict->value(file.left(file.length() - 10));
             } else {
                 entry = m_currentEntryDict->value(file);
             }
             // remove from m_ctimeDict; if m_ctimeDict is not empty
             // after all files have been processed, it means
             // some files were removed since last time
             if (file.contains(QLatin1String("fake"))) {
                 qCDebug(SYCOCA) << "reusing (and removing) old entry for:" << file << "entry=" << entry;
             }
             m_ctimeDict->remove(file, m_resource);
         } else if (oldTimestamp) {
             m_changed = true;
             m_ctimeDict->remove(file, m_resource);
             qCDebug(SYCOCA) << "modified:" << file;
         } else {
             m_changed = true;
             qCDebug(SYCOCA) << "new:" << file;
         }
     }
     m_ctimeFactory->dict()->addCTime(file, m_resource, timeStamp);
     if (!entry) {
         // Create a new entry
         entry = currentFactory->createEntry(file);
     }
     if (entry && entry->isValid()) {
         return entry;
     }
     return KSycocaEntry::Ptr();
 }
 
 KService::Ptr KBuildSycoca::createService(const QString &path)
 {
     KSycocaEntry::Ptr entry = createEntry(d->m_serviceFactory, path);
     if (entry) {
         m_tempStorage.append(entry);
     }
     return KService::Ptr(static_cast<KService *>(entry.data()));
 }
 
 static QStringList locateDirInResource(const QString &resourceSubdir)
 {
     const QString dir = QStringLiteral(":/") + resourceSubdir; // e.g. :/kservicetypes5
     if (QDir(dir).exists()) {
         return {dir};
     }
     return {};
 }
 
 // returns false if the database is up to date, true if it needs to be saved
 bool KBuildSycoca::build()
 {
     using KBSEntryDictList = QList<KBSEntryDict *>;
     KBSEntryDictList entryDictList;
     KBSEntryDict *serviceEntryDict = nullptr;
 
     // Convert for each factory the entryList to a Dict.
     entryDictList.reserve(factories()->size());
     int i = 0;
     // For each factory
     const auto &factoryList = *factories();
     for (KSycocaFactory *factory : factoryList) {
         KBSEntryDict *entryDict = new KBSEntryDict;
         if (m_allEntries) { // incremental build
             for (const KSycocaEntry::Ptr &entry : std::as_const((*m_allEntries).at(i++))) {
                 // if (entry->entryPath().contains("fake"))
                 //    qCDebug(SYCOCA) << "inserting into entryDict:" << entry->entryPath() << entry;
                 entryDict->insert(entry->entryPath(), entry);
             }
         }
         if (factory == d->m_serviceFactory) {
             serviceEntryDict = entryDict;
         } else if (factory == m_buildServiceGroupFactory) {
             m_serviceGroupEntryDict = entryDict;
         }
         entryDictList.append(entryDict);
     }
 
     // Save the mtime of each dir, just before we list them
     // ## should we convert to UTC to avoid surprises when summer time kicks in?
     const auto lstDirs = factoryResourceDirs();
     for (const QString &dir : lstDirs) {
         qint64 stamp = 0;
         KSycocaUtilsPrivate::visitResourceDirectory(dir, [&stamp](const QFileInfo &info) {
             stamp = qMax(stamp, info.lastModified().toMSecsSinceEpoch());
             return true;
         });
         m_allResourceDirs.insert(dir, stamp);
     }
 
     const auto lstFiles = factoryExtraFiles();
     for (const QString &file : lstFiles) {
         m_extraFiles.insert(file, QFileInfo(file).lastModified().toMSecsSinceEpoch());
     }
 
     QMap<QString, QByteArray> allResourcesSubDirs; // dirs, kstandarddirs-resource-name
     // For each factory
     for (KSycocaFactory *factory : factoryList) {
         // For each resource the factory deals with
         const KSycocaResourceList resourceList = factory->resourceList();
         for (const KSycocaResource &res : resourceList) {
             // With this we would get dirs, but not a unique list of relative files (for global+local merging to work)
             // const QStringList dirs = QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, res.subdir, QStandardPaths::LocateDirectory);
             // allResourcesSubDirs[res.resource] += dirs;
             allResourcesSubDirs.insert(res.subdir, res.resource);
         }
     }
 
     m_ctimeFactory = new KCTimeFactory(this); // This is a build factory too, don't delete!!
     for (auto it1 = allResourcesSubDirs.cbegin(); it1 != allResourcesSubDirs.cend(); ++it1) {
         m_changed = false;
         m_resourceSubdir = it1.key();
         m_resource = it1.value();
 
         QSet<QString> relFiles;
         const QStringList dirs = QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, m_resourceSubdir, QStandardPaths::LocateDirectory)
             + locateDirInResource(m_resourceSubdir);
         qCDebug(SYCOCA) << "Looking for subdir" << m_resourceSubdir << "=>" << dirs;
         for (const QString &dir : dirs) {
             QDirIterator it(dir, QDirIterator::Subdirectories);
             while (it.hasNext()) {
                 const QString filePath = it.next();
                 Q_ASSERT(filePath.startsWith(dir)); // due to the line below...
                 const QString relPath = filePath.mid(dir.length() + 1);
                 relFiles.insert(relPath);
             }
         }
         // Now find all factories that use this resource....
         // For each factory -- and its corresponding entryDict (iterate over both lists in parallel)
         for (int f = 0; f < factoryList.count(); ++f) {
             KSycocaFactory *currentFactory = factoryList.at(f);
             // m_ctimeInfo gets created after the initial loop, so it has no entryDict.
             m_currentEntryDict = f == entryDictList.size() ? nullptr : entryDictList.at(f);
             // For each resource the factory deals with
             const KSycocaResourceList &resourceList = currentFactory->resourceList();
             for (const KSycocaResource &res : resourceList) {
                 if (res.resource != m_resource) {
                     continue;
                 }
 
                 // For each file in the resource
                 for (const QString &entryPath : std::as_const(relFiles)) {
                     // Check if file matches filter
                     if (entryPath.endsWith(res.extension)) {
                         KSycocaEntry::Ptr entry = createEntry(currentFactory, entryPath);
                         if (entry) {
                             currentFactory->addEntry(entry);
                         }
                     }
                 }
             }
         }
     }
 
     bool result = true;
     const bool createVFolder = true; // we need to always run the VFolderMenu code
     if (createVFolder || m_menuTest) {
         m_resource = "apps";
         m_resourceSubdir = QStringLiteral("applications");
         m_currentEntryDict = serviceEntryDict;
         m_changed = false;
 
         m_vfolder = new VFolderMenu(d->m_serviceFactory, this);
         if (!m_trackId.isEmpty()) {
             m_vfolder->setTrackId(m_trackId);
         }
 
         VFolderMenu::SubMenu *kdeMenu = m_vfolder->parseMenu(QStringLiteral(APPLICATIONS_MENU_NAME));
 
         KServiceGroup::Ptr entry = m_buildServiceGroupFactory->addNew(QStringLiteral("/"), kdeMenu->directoryFile, KServiceGroup::Ptr(), false);
         entry->setLayoutInfo(kdeMenu->layoutList);
         createMenu(QString(), QString(), kdeMenu);
 
         // Storing the mtime *after* looking at these dirs is a tiny race condition,
         // but I'm not sure how to get the vfolder dirs upfront...
         const auto allDirectories = m_vfolder->allDirectories();
         for (QString dir : allDirectories) {
             if (dir.endsWith(QLatin1Char('/'))) {
                 dir.chop(1); // remove trailing slash, to avoid having ~/.local/share/applications twice
             }
             if (!m_allResourceDirs.contains(dir)) {
                 qint64 stamp = 0;
                 KSycocaUtilsPrivate::visitResourceDirectory(dir, [&stamp](const QFileInfo &info) {
                     stamp = qMax(stamp, info.lastModified().toMSecsSinceEpoch());
                     return true;
                 });
                 m_allResourceDirs.insert(dir, stamp);
             }
         }
 
         if (m_menuTest) {
             result = false;
         }
     }
 
     if (m_ctimeDict && !m_ctimeDict->isEmpty()) {
         qCDebug(SYCOCA) << "Still in time dict:";
         m_ctimeDict->dump();
     }
 
     qDeleteAll(entryDictList);
     return result;
 }
 
 void KBuildSycoca::createMenu(const QString &caption_, const QString &name_, VFolderMenu::SubMenu *menu)
 {
     QString caption = caption_;
     QString name = name_;
     for (VFolderMenu::SubMenu *subMenu : std::as_const(menu->subMenus)) {
         QString subName = name + subMenu->name + QLatin1Char('/');
 
         QString directoryFile = subMenu->directoryFile;
         if (directoryFile.isEmpty()) {
             directoryFile = subName + QLatin1String(".directory");
         }
         quint32 timeStamp = m_ctimeFactory->dict()->ctime(directoryFile, m_resource);
         if (!timeStamp) {
             timeStamp = calcResourceHash(m_resourceSubdir, directoryFile);
         }
 
         KServiceGroup::Ptr entry;
         if (m_allEntries) {
             const quint32 oldTimestamp = m_ctimeDict->ctime(directoryFile, m_resource);
 
             if (timeStamp && (timeStamp == oldTimestamp)) {
                 KSycocaEntry::Ptr group = m_serviceGroupEntryDict->value(subName);
                 if (group) {
                     entry = KServiceGroup::Ptr(static_cast<KServiceGroup *>(group.data()));
                     if (entry->directoryEntryPath() != directoryFile) {
                         entry = nullptr; // Can't reuse this one!
                     }
                 }
             }
         }
         if (timeStamp) { // bug? (see calcResourceHash). There might not be a .directory file...
             m_ctimeFactory->dict()->addCTime(directoryFile, m_resource, timeStamp);
         }
 
         entry = m_buildServiceGroupFactory->addNew(subName, subMenu->directoryFile, entry, subMenu->isDeleted);
         entry->setLayoutInfo(subMenu->layoutList);
         if (!(m_menuTest && entry->noDisplay())) {
             createMenu(caption + entry->caption() + QLatin1Char('/'), subName, subMenu);
         }
     }
     if (caption.isEmpty()) {
         caption += QLatin1Char('/');
     }
     if (name.isEmpty()) {
         name += QLatin1Char('/');
     }
     for (const KService::Ptr &p : std::as_const(menu->items)) {
         if (m_menuTest) {
             if (!menu->isDeleted && !p->noDisplay()) {
                 printf("%s\t%s\t%s\n",
                        qPrintable(caption),
                        qPrintable(p->menuId()),
                        qPrintable(QStandardPaths::locate(QStandardPaths::ApplicationsLocation, p->entryPath())));
             }
         } else {
             m_buildServiceGroupFactory->addNewEntryTo(name, p);
         }
     }
 }
 
 bool KBuildSycoca::recreate(bool incremental)
 {
     QFileInfo fi(KSycoca::absoluteFilePath());
     if (!QDir().mkpath(fi.absolutePath())) {
         qCWarning(SYCOCA) << "Couldn't create" << fi.absolutePath();
         return false;
     }
     QString path(fi.absoluteFilePath());
 
     QLockFile lockFile(path + QLatin1String(".lock"));
     if (!lockFile.tryLock()) {
         qCDebug(SYCOCA) << "Waiting for already running" << KBUILDSYCOCA_EXENAME << "to finish.";
         if (!lockFile.lock()) {
             qCWarning(SYCOCA) << "Couldn't lock" << path + QLatin1String(".lock");
             return false;
         }
         if (!needsRebuild()) {
             // qCDebug(SYCOCA) << "Up-to-date, skipping.";
             return true;
         }
     }
 
     QByteArray qSycocaPath = QFile::encodeName(path);
     s_cSycocaPath = qSycocaPath.data();
 
     m_allEntries = nullptr;
     m_ctimeDict = nullptr;
     if (incremental && checkGlobalHeader()) {
         qCDebug(SYCOCA) << "Reusing existing ksycoca";
         KSycoca *oldSycoca = KSycoca::self();
         m_allEntries = new KSycocaEntryListList;
         m_ctimeDict = new KCTimeDict;
 
         // Must be in same order as in KBuildSycoca::recreate()!
         m_allEntries->append(KSycocaPrivate::self()->serviceTypeFactory()->allEntries());
         m_allEntries->append(KSycocaPrivate::self()->mimeTypeFactory()->allEntries());
         m_allEntries->append(KSycocaPrivate::self()->serviceGroupFactory()->allEntries());
         m_allEntries->append(KSycocaPrivate::self()->serviceFactory()->allEntries());
 
         KCTimeFactory *ctimeInfo = new KCTimeFactory(oldSycoca);
         *m_ctimeDict = ctimeInfo->loadDict();
     }
     s_cSycocaPath = nullptr;
 
     QSaveFile database(path);
     bool openedOK = database.open(QIODevice::WriteOnly);
 
     if (!openedOK && database.error() == QFile::WriteError && QFile::exists(path)) {
         QFile::remove(path);
         openedOK = database.open(QIODevice::WriteOnly);
     }
     if (!openedOK) {
         qCWarning(SYCOCA) << "ERROR creating database" << path << ":" << database.errorString();
         return false;
     }
 
     QDataStream *str = new QDataStream(&database);
     str->setVersion(QDataStream::Qt_5_3);
 
     m_newTimestamp = QDateTime::currentMSecsSinceEpoch();
     qCDebug(SYCOCA).nospace() << "Recreating ksycoca file (" << path << ", version " << KSycoca::version() << ")";
 
     // It is very important to build the servicetype one first
     KBuildServiceTypeFactory *buildServiceTypeFactory = new KBuildServiceTypeFactory(this);
     d->m_serviceTypeFactory = buildServiceTypeFactory;
     KBuildMimeTypeFactory *buildMimeTypeFactory = new KBuildMimeTypeFactory(this);
     d->m_mimeTypeFactory = buildMimeTypeFactory;
     m_buildServiceGroupFactory = new KBuildServiceGroupFactory(this);
     d->m_serviceGroupFactory = m_buildServiceGroupFactory;
     d->m_serviceFactory = new KBuildServiceFactory(buildServiceTypeFactory, buildMimeTypeFactory, m_buildServiceGroupFactory);
 
     if (build()) { // Parse dirs
         save(str); // Save database
         if (str->status() != QDataStream::Ok) { // Probably unnecessary now in Qt5, since QSaveFile detects write errors
             database.cancelWriting(); // Error
         }
         delete str;
         str = nullptr;
 
         // if we are currently via sudo, preserve the original owner
         // as $HOME may also be that of another user rather than /root
 #ifdef Q_OS_UNIX
         if (qEnvironmentVariableIsSet("SUDO_UID")) {
             const int uid = qEnvironmentVariableIntValue("SUDO_UID");
             const int gid = qEnvironmentVariableIntValue("SUDO_GID");
             if (uid && gid) {
                 fchown(database.handle(), uid, gid);
             }
         }
 #endif
 
         if (!database.commit()) {
             qCWarning(SYCOCA) << "ERROR writing database" << database.fileName() << database.errorString();
             return false;
         }
 
         // Compatibility code for KF < 5.15: provide a ksycoca5 symlink after the filename change, for old apps to keep working during the upgrade
         const QString oldSycoca = QStandardPaths::writableLocation(QStandardPaths::GenericCacheLocation) + QLatin1String("/ksycoca5");
         if (QFile::exists(oldSycoca)) {
             QFile::remove(oldSycoca);
 #ifdef Q_OS_UNIX
             if (::link(QFile::encodeName(path).constData(), QFile::encodeName(oldSycoca).constData()) != 0) {
                 QFile::copy(path, oldSycoca);
             }
 #else
             QFile::copy(path, oldSycoca);
 #endif
         }
     } else {
         delete str;
         str = nullptr;
         database.cancelWriting();
         if (m_menuTest) {
             return true;
         }
         qCDebug(SYCOCA) << "Database is up to date";
     }
 
     if (d->m_sycocaStrategy == KSycocaPrivate::StrategyMemFile) {
         KMemFile::fileContentsChanged(path);
     }
 
     delete m_ctimeDict;
     delete m_allEntries;
     delete m_vfolder;
 
     return true;
 }
 
 void KBuildSycoca::save(QDataStream *str)
 {
     // Write header (#pass 1)
     str->device()->seek(0);
 
     (*str) << qint32(KSycoca::version());
     // KSycocaFactory * servicetypeFactory = 0;
     // KBuildMimeTypeFactory * mimeTypeFactory = 0;
     KBuildServiceFactory *serviceFactory = nullptr;
     auto lst = *factories();
     for (KSycocaFactory *factory : std::as_const(lst)) {
         qint32 aId;
         qint32 aOffset;
         aId = factory->factoryId();
         // if ( aId == KST_KServiceTypeFactory )
         //   servicetypeFactory = factory;
         // else if ( aId == KST_KMimeTypeFactory )
         //   mimeTypeFactory = static_cast<KBuildMimeTypeFactory *>( factory );
         if (aId == KST_KServiceFactory) {
             serviceFactory = static_cast<KBuildServiceFactory *>(factory);
         }
         aOffset = factory->offset(); // not set yet, so always 0
         (*str) << aId;
         (*str) << aOffset;
     }
     (*str) << qint32(0); // No more factories.
     // Write XDG_DATA_DIRS
     (*str) << QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation).join(QString(QLatin1Char(':')));
     (*str) << m_newTimestamp;
     (*str) << QLocale().bcp47Name();
     // This makes it possible to trigger a ksycoca update for all users (KIOSK feature)
     (*str) << calcResourceHash(QStringLiteral("kservices5"), QStringLiteral("update_ksycoca"));
     (*str) << m_allResourceDirs.keys();
     for (auto it = m_allResourceDirs.constBegin(); it != m_allResourceDirs.constEnd(); ++it) {
         (*str) << it.value();
     }
     (*str) << m_extraFiles.keys();
     for (auto it = m_extraFiles.constBegin(); it != m_extraFiles.constEnd(); ++it) {
         (*str) << it.value();
     }
 
     // Calculate per-servicetype/MIME type data
     if (serviceFactory) {
         serviceFactory->postProcessServices();
     }
 
     // Here so that it's the last debug message
     qCDebug(SYCOCA) << "Saving";
 
     // Write factory data....
     lst = *factories();
     for (KSycocaFactory *factory : std::as_const(lst)) {
         factory->save(*str);
         if (str->status() != QDataStream::Ok) { // ######## TODO: does this detect write errors, e.g. disk full?
             return; // error
         }
     }
 
     qint64 endOfData = str->device()->pos();
 
     // Write header (#pass 2)
     str->device()->seek(0);
 
     (*str) << qint32(KSycoca::version());
     lst = *factories();
     for (KSycocaFactory *factory : std::as_const(lst)) {
         qint32 aId;
         qint32 aOffset;
         aId = factory->factoryId();
         aOffset = factory->offset();
         (*str) << aId;
         (*str) << aOffset;
     }
     (*str) << qint32(0); // No more factories.
 
     // Jump to end of database
     str->device()->seek(endOfData);
 }
 
 QStringList KBuildSycoca::factoryResourceDirs()
 {
     static QStringList *dirs = nullptr;
     if (dirs != nullptr) {
         return *dirs;
     }
     dirs = new QStringList;
     // these are all resource dirs cached by ksycoca
     *dirs += KServiceTypeFactory::resourceDirs();
     *dirs += KMimeTypeFactory::resourceDirs();
     *dirs += KServiceFactory::resourceDirs();
 
     return *dirs;
 }
 
 QStringList KBuildSycoca::factoryExtraFiles()
 {
     QStringList files;
     // these are the extra files cached by ksycoca
     // and whose timestamps are checked
     files += KMimeAssociations::mimeAppsFiles();
 
     return files;
 }
 
 QStringList KBuildSycoca::existingResourceDirs()
 {
     static QStringList *dirs = nullptr;
     if (dirs != nullptr) {
         return *dirs;
     }
     dirs = new QStringList(factoryResourceDirs());
 
     auto checkDir = [](const QString &str) {
         QFileInfo info(str);
         return !info.exists() || !info.isReadable();
     };
     dirs->erase(std::remove_if(dirs->begin(), dirs->end(), checkDir), dirs->end());
 
     return *dirs;
 }
 
 static quint32 updateHash(const QString &file, quint32 hash)
 {
     QFileInfo fi(file);
     if (fi.isReadable() && fi.isFile()) {
         // This was using buff.st_ctime (in Waldo's initial commit to kstandarddirs.cpp in 2001), but that looks wrong?
         // Surely we want to catch manual editing, while a chmod doesn't matter much?
         qint64 timestamp = fi.lastModified().toSecsSinceEpoch();
         // On some systems (i.e. Fedora Kinoite), all files in /usr have a last
         // modified timestamp of 0 (UNIX Epoch). In this case, always assume
         // the file as been changed.
         if (timestamp == 0) {
             static qint64 now = QDateTime::currentDateTimeUtc().toSecsSinceEpoch();
             timestamp = now;
         }
         hash += timestamp;
     }
     return hash;
 }
 
 quint32 KBuildSycoca::calcResourceHash(const QString &resourceSubDir, const QString &filename)
 {
     quint32 hash = 0;
     if (!QDir::isRelativePath(filename)) {
         return updateHash(filename, hash);
     }
     const QString filePath = resourceSubDir + QLatin1Char('/') + filename;
     const QString qrcFilePath = QStringLiteral(":/") + filePath;
     const QStringList files =
         QFileInfo::exists(qrcFilePath) ? QStringList{qrcFilePath} : QStandardPaths::locateAll(QStandardPaths::GenericDataLocation, filePath);
     for (const QString &file : files) {
         hash = updateHash(file, hash);
     }
     if (hash == 0 && !filename.endsWith(QLatin1String("update_ksycoca"))
         && !filename.endsWith(QLatin1String(".directory")) // bug? needs investigation from someone who understands the VFolder spec
     ) {
         if (files.isEmpty()) {
             // This can happen if the file was deleted between directory listing and the above locateAll
             qCDebug(SYCOCA) << "File not found anymore:" << filename << " -- probably deleted meanwhile";
         } else {
             // This can happen if the file was deleted between locateAll and QFileInfo
             qCDebug(SYCOCA) << "File(s) found but not readable (or disappeared meanwhile)" << files;
         }
     }
     return hash;
 }
 
 bool KBuildSycoca::checkGlobalHeader()
 {
     // Since it's part of the filename, we are 99% sure that the locale and prefixes will match.
     const QString current_language = QLocale().bcp47Name();
     const quint32 current_update_sig = KBuildSycoca::calcResourceHash(QStringLiteral("kservices5"), QStringLiteral("update_ksycoca"));
     const QString current_prefixes = QStandardPaths::standardLocations(QStandardPaths::GenericDataLocation).join(QString(QLatin1Char(':')));
 
     const KSycocaHeader header = KSycocaPrivate::self()->readSycocaHeader();
     Q_ASSERT(!header.prefixes.split(QLatin1Char(':')).contains(QDir::homePath()));
 
     return (current_update_sig == header.updateSignature) //
         && (current_language == header.language) //
         && (current_prefixes == header.prefixes) //
         && (header.timeStamp != 0);
 }
 
 const char *KBuildSycoca::sycocaPath()
 {
     return s_cSycocaPath;
 }
 
 #include "moc_kbuildsycoca_p.cpp"