mythcontext.cpp

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#include "mythcontext.h"
 
#include <algorithm>
#include <array>
#include <cmath>
#include <iostream>
#include <queue>
#include <thread>
#include <unistd.h> // for usleep(), gethostname
#include <vector>
 
#include <QCoreApplication>
#include <QDateTime>
#include <QDebug>
#include <QDir>
#include <QEventLoop>
#include <QFileInfo>
#include <QHostInfo>
#include <QMutex>
#include <QTcpSocket>
#ifdef Q_OS_ANDROID
#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
#include <QtAndroidExtras>
#else
#include <QJniEnvironment>
#include <QJniObject>
#define QAndroidJniEnvironment QJniEnvironment
#define QAndroidJniObject QJniObject
#endif
#endif
 
#ifdef _WIN32
#include "libmythbase/compat.h"
#endif
#include "libmythbase/configuration.h"
#include "libmythbase/dbutil.h"
#include "libmythbase/exitcodes.h"
#include "libmythbase/mythappname.h"
#include "libmythbase/mythcorecontext.h"
#include "libmythbase/mythdate.h"
#include "libmythbase/mythdb.h"
#include "libmythbase/mythdirs.h"
#include "libmythbase/mythevent.h"
#include "libmythbase/mythlogging.h"
#include "libmythbase/mythmiscutil.h"
#include "libmythbase/mythplugin.h"
#include "libmythbase/mythsystemlegacy.h"
#include "libmythbase/mythtranslation.h"
#include "libmythbase/mythversion.h"
#include "libmythbase/portchecker.h"
#include "libmythbase/referencecounter.h"
#include "libmythbase/remotefile.h"
#include "libmythbase/signalhandling.h"
#include "libmythui/guistartup.h"
#include "libmythui/langsettings.h"
#include "libmythui/mediamonitor.h"
#include "libmythui/mythdialogbox.h"
#include "libmythui/mythimage.h"
#include "libmythui/mythmainwindow.h"
#include "libmythui/mythuihelper.h"
#include "libmythupnp/mythxmlclient.h"
#include "libmythupnp/upnp.h"
 
#include "backendselect.h"
#include "dbsettings.h"
 
#define LOC      QString("MythContext: ")
static const QString sLocation = "MythContext";
 
namespace
{
class GUISettingsCache
{
  public:
    GUISettingsCache() = default;
    GUISettingsCache(const QString& cache_filename, QString cache_path)
        : m_cachePath(std::move(cache_path))
    {
        m_cacheFilename = m_cachePath + '/' + cache_filename;
        if (m_cachePath.isEmpty() || cache_filename.isEmpty())
        {
            m_cacheFilename = m_cachePath = QString();
        }
    }
 
    bool save();
    void loadOverrides() const;
    static void clearOverrides();
 
  private:
    QString m_cacheFilename {"cache/contextcache.xml"};
    QString m_cachePath     {"cache"};
 
    static const std::array<QString, 13> kSettings;
};
 
} // anonymous namespace
 
class MythContext::Impl : public QObject
{
    Q_OBJECT;
 
  public:
    explicit Impl();
   ~Impl() override;
 
    bool Init        (bool gui,
                      bool promptForBackend,
                      bool disableAutoDiscovery,
                      bool ignoreDB);
    bool FindDatabase(bool prompt, bool noAutodetect);
 
    void TempMainWindow();
    void EndTempWindow();
    void LanguagePrompt();
 
    bool LoadDatabaseSettings();
 
    static QString setLocalHostName(QString hostname);
 
    bool    PromptForDatabaseParams(const QString &error);
    QString TestDBconnection(bool prompt=true);
    void    SilenceDBerrors();
    void    EnableDBerrors();
    static void ResetDatabase(const DatabaseParams& dbParams);
 
    BackendSelection::Decision
            ChooseBackend(const QString &error);
    int     UPnPautoconf(std::chrono::milliseconds milliSeconds = 2s);
    bool    DefaultUPnP(QString& Error);
    bool    UPnPconnect(const DeviceLocation *backend, const QString &PIN);
    void    ShowGuiStartup();
    bool    checkPort(QString &host, int port, std::chrono::seconds timeLimit) const;
    static void processEvents();
 
  protected:
    bool event(QEvent* /*e*/) override; // QObject
 
    void ShowConnectionFailurePopup(bool persistent);
    void HideConnectionFailurePopup();
 
    void ShowVersionMismatchPopup(uint remote_version);
 
  public slots:
    void OnCloseDialog();
    void VersionMismatchPopupClosed();
 
  public:
    bool                    m_gui                {false};
 
    QString                 m_masterhostname;  
 
    QString                 m_dbHostCp;  
 
    bool                   m_disableeventpopup   {false};
 
    MythUIHelper           *m_ui                 {nullptr};
    GUIStartup             *m_guiStartup         {nullptr};
    QEventLoop             *m_loop               {nullptr};
    bool                    m_needsBackend       {false};
 
    GUISettingsCache        m_GUISettingsCache;
 
  private:
    MythConfirmationDialog *m_mbeVersionPopup    {nullptr};
    int                     m_registration       {-1};
    QDateTime               m_lastCheck;
    QTcpSocket             *m_socket             {nullptr};
};
 
static void exec_program_cb(const QString &cmd)
{
    myth_system(cmd);
}
 
static void exec_program_tv_cb(const QString &cmd)
{
    QString s = cmd;
    QStringList tokens = cmd.simplified().split(" ");
    QStringList strlist;
 
    bool cardidok = false;
    int wantcardid = tokens[0].toInt(&cardidok, 10);
 
    if (cardidok && wantcardid > 0)
    {
        strlist << QString("LOCK_TUNER %1").arg(wantcardid);
        s = s.replace(0, tokens[0].length() + 1, "");
    }
    else
    {
        strlist << "LOCK_TUNER";
    }
 
    gCoreContext->SendReceiveStringList(strlist);
    int cardid = strlist[0].toInt();
 
    if (cardid >= 0)
    {
        s = s.arg(qPrintable(strlist[1]),
                  qPrintable(strlist[2]),
                  qPrintable(strlist[3]));
 
        myth_system(s);
 
        strlist = QStringList(QString("FREE_TUNER %1").arg(cardid));
        gCoreContext->SendReceiveStringList(strlist);
    }
    else
    {
        QString label;
 
        if (cardidok)
        {
            if (cardid == -1)
            {
                label = QObject::tr("Could not find specified tuner (%1).")
                                    .arg(wantcardid);
            }
            else
            {
                label = QObject::tr("Specified tuner (%1) is already in use.")
                                    .arg(wantcardid);
            }
        }
        else
        {
            label = QObject::tr("All tuners are currently in use. If you want "
                                "to watch TV, you can cancel one of the "
                                "in-progress recordings from the delete menu");
        }
 
        LOG(VB_GENERAL, LOG_ALERT, QString("exec_program_tv: ") + label);
 
        ShowOkPopup(label);
    }
}
 
static void configplugin_cb(const QString &cmd)
{
    MythPluginManager *pmanager = gCoreContext->GetPluginManager();
    if (!pmanager)
        return;
 
    if (GetNotificationCenter() && pmanager->config_plugin(cmd.trimmed()))
    {
        ShowNotificationError(cmd, sLocation,
                              QObject::tr("Failed to configure plugin"));
    }
}
 
static void plugin_cb(const QString &cmd)
{
    MythPluginManager *pmanager = gCoreContext->GetPluginManager();
    if (!pmanager)
        return;
 
    if (GetNotificationCenter() && pmanager->run_plugin(cmd.trimmed()))
    {
        ShowNotificationError(QObject::tr("Plugin failure"),
                              sLocation,
                              QObject::tr("%1 failed to run for some reason").arg(cmd));
    }
}
 
static void eject_cb()
{
    MediaMonitor::ejectOpticalDisc();
}
 
MythContext::Impl::Impl()
    : m_loop(new QEventLoop(this))
{
    InitializeMythDirs();
}
 
MythContext::Impl::~Impl()
{
    if (GetNotificationCenter() && m_registration > 0)
    {
        GetNotificationCenter()->UnRegister(this, m_registration, true);
    }
 
    delete m_loop;
 
    if (m_ui)
        DestroyMythUI();
}
 
void MythContext::Impl::TempMainWindow()
{
    if (HasMythMainWindow())
        return;
 
    SilenceDBerrors();
 
#ifdef Q_OS_DARWIN
    // Qt 4.4 has window-focus problems
    gCoreContext->OverrideSettingForSession("RunFrontendInWindow", "1");
#endif
    GetMythUI()->Init();
    MythMainWindow *mainWindow = MythMainWindow::getMainWindow(false);
    mainWindow->Init();
}
 
void MythContext::Impl::EndTempWindow()
{
    if (HasMythMainWindow())
    {
        if (m_guiStartup && !m_guiStartup->m_Exit)
        {
            MythScreenStack *mainStack = GetMythMainWindow()->GetMainStack();
            if (mainStack)
            {
                mainStack->PopScreen(m_guiStartup, false);
                m_guiStartup = nullptr;
            }
        }
    }
    EnableDBerrors();
}
 
void MythContext::Impl::LanguagePrompt()
{
    // ask user for language settings
    LanguageSelection::prompt();
    MythTranslation::load("mythfrontend");
}
 
bool MythContext::Impl::checkPort(QString &host, int port, std::chrono::seconds timeLimit) const
{
    PortChecker checker;
    if (m_guiStartup)
        QObject::connect(m_guiStartup, &GUIStartup::cancelPortCheck, &checker, &PortChecker::cancelPortCheck);
    return checker.checkPort(host, port, timeLimit);
}
 
 
bool MythContext::Impl::Init(const bool gui,
                              const bool promptForBackend,
                              const bool disableAutoDiscovery,
                              const bool ignoreDB)
{
    gCoreContext->GetDB()->IgnoreDatabase(ignoreDB);
    m_gui = gui;
    if (gui)
    {
        m_GUISettingsCache.loadOverrides();
    }
 
    if (gCoreContext->IsFrontend())
        m_needsBackend = true;
 
    // Creates screen saver control if we will have a GUI
    if (gui)
        m_ui = GetMythUI();
 
    // ---- database connection stuff ----
 
    if (!ignoreDB && !FindDatabase(promptForBackend, disableAutoDiscovery))
    {
        EndTempWindow();
        return false;
    }
 
    // ---- keep all DB-using stuff below this line ----
 
    // Prompt for language if this is a first time install and
    // we didn't already do so.
    if (m_gui && !gCoreContext->GetDB()->HaveSchema())
    {
        TempMainWindow();
        LanguagePrompt();
    }
    gCoreContext->InitLocale();
    gCoreContext->SaveLocaleDefaults();
 
    // Close GUI Startup Window.
    if (m_guiStartup)
    {
        MythScreenStack *mainStack = GetMythMainWindow()->GetMainStack();
        if (mainStack)
            mainStack->PopScreen(m_guiStartup, false);
        m_guiStartup=nullptr;
    }
    EndTempWindow();
 
    if (gui)
    {
        MythUIMenuCallbacks cbs {};
        cbs.exec_program = exec_program_cb;
        cbs.exec_program_tv = exec_program_tv_cb;
        cbs.configplugin = configplugin_cb;
        cbs.plugin = plugin_cb;
        cbs.eject = eject_cb;
 
        m_ui->Init(cbs);
    }
 
    return true;
}
 
bool MythContext::Impl::FindDatabase(bool prompt, bool noAutodetect)
{
    // We can only prompt if autodiscovery is enabled..
    bool manualSelect = prompt && !noAutodetect;
 
    QString failure;
 
    // 1. Either load XmlConfiguration::k_default_filename or use sensible "localhost" defaults:
    bool loaded = LoadDatabaseSettings();
    DatabaseParams dbParams = GetMythDB()->GetDatabaseParams();
    setLocalHostName(dbParams.m_localHostName);
    DatabaseParams dbParamsFromFile = dbParams;
 
    // In addition to the UI chooser, we can also try to autoSelect later,
    // but only if we're not doing manualSelect and there was no
    // valid XmlConfiguration::k_default_filename
    bool autoSelect = !manualSelect && !loaded && !noAutodetect;
 
    // 2. If the user isn't forcing up the chooser UI, look for a default
    //    backend in XmlConfiguration::k_default_filename, then test DB settings we've got so far:
    if (!manualSelect)
    {
        // XmlConfiguration::k_default_filename may contain a backend host UUID and PIN.
        // If so, try to AutoDiscover UPnP server, and use its DB settings:
 
        if (DefaultUPnP(failure))                // Probably a valid backend,
            autoSelect = manualSelect = false;   // so disable any further UPnP
        else
            if (!failure.isEmpty())
                LOG(VB_GENERAL, LOG_ALERT, failure);
 
        failure = TestDBconnection(loaded);
        if (failure.isEmpty())
            goto DBfound;
        if (m_guiStartup && m_guiStartup->m_Exit)
            return false;
        if (m_guiStartup && m_guiStartup->m_Search)
            autoSelect=true;
    }
 
    // 3. Try to automatically find the single backend:
    if (autoSelect)
    {
        int count = UPnPautoconf();
 
        if (count == 0)
            failure = QObject::tr("No UPnP backends found", "Backend Setup");
 
        if (count == 1)
        {
            failure = TestDBconnection();
            if (failure.isEmpty())
                goto DBfound;
            if (m_guiStartup && m_guiStartup->m_Exit)
                return false;
        }
 
        // Multiple BEs, or needs PIN.
        manualSelect |= (count > 1 || count == -1);
        // Search requested
        if (m_guiStartup && m_guiStartup->m_Search)
            manualSelect=true;
    }
 
    manualSelect &= m_gui;  // no interactive command-line chooser yet
 
    // Queries the user for the DB info
    do
    {
        if (manualSelect)
        {
            // Get the user to select a backend from a possible list:
            switch (ChooseBackend(failure))
            {
                case BackendSelection::kAcceptConfigure:
                    break;
                case BackendSelection::kManualConfigure:
                    manualSelect = false;
                    break;
                case BackendSelection::kCancelConfigure:
                    goto NoDBfound;
            }
        }
 
        if (!manualSelect)
        {
            // If this is a backend, No longer prompt for database.
            // Instaed allow the web server to start so that the
            // database can be set up there
            if (gCoreContext->IsBackend()
                || !PromptForDatabaseParams(failure))
                goto NoDBfound;
        }
        failure = TestDBconnection();
        if (!failure.isEmpty())
            LOG(VB_GENERAL, LOG_ALERT, failure);
        if (m_guiStartup && m_guiStartup->m_Exit)
            return false;
        if (m_guiStartup && m_guiStartup->m_Search)
            manualSelect=true;
        if (m_guiStartup && m_guiStartup->m_Setup)
            manualSelect=false;
    }
    while (!failure.isEmpty());
 
DBfound:
    LOG(VB_GENERAL, LOG_DEBUG, "FindDatabase() - Success!");
    // If we got the database from UPNP then the wakeup settings are lost.
    // Restore them.
    dbParams.m_wolEnabled = dbParamsFromFile.m_wolEnabled;
    dbParams.m_wolReconnect = dbParamsFromFile.m_wolReconnect;
    dbParams.m_wolRetry = dbParamsFromFile.m_wolRetry;
    dbParams.m_wolCommand = dbParamsFromFile.m_wolCommand;
 
    GetMythDB()->SaveDatabaseParams(dbParams, !loaded || dbParamsFromFile != dbParams);
    EnableDBerrors();
    ResetDatabase(dbParams);
    return true;
 
NoDBfound:
    LOG(VB_GENERAL, LOG_DEBUG, "FindDatabase() - failed");
    return false;
}
 
bool MythContext::Impl::LoadDatabaseSettings()
{
    auto config = XmlConfiguration(); // read-only
 
    DatabaseParams dbParams;
 
    dbParams.m_localHostName  = config.GetValue("LocalHostName", "");
    dbParams.m_dbHostPing     = config.GetValue(XmlConfiguration::kDefaultDB + "PingHost", true);
    dbParams.m_dbHostName     = config.GetValue(XmlConfiguration::kDefaultDB + "Host", "");
    dbParams.m_dbUserName     = config.GetValue(XmlConfiguration::kDefaultDB + "UserName", "");
    dbParams.m_dbPassword     = config.GetValue(XmlConfiguration::kDefaultDB + "Password", "");
    dbParams.m_dbName         = config.GetValue(XmlConfiguration::kDefaultDB + "DatabaseName", "");
    dbParams.m_dbPort         = config.GetValue(XmlConfiguration::kDefaultDB + "Port", 0);
 
    dbParams.m_wolEnabled     = config.GetValue(XmlConfiguration::kDefaultWOL + "Enabled", false);
    dbParams.m_wolReconnect   =
        config.GetDuration<std::chrono::seconds>(XmlConfiguration::kDefaultWOL + "SQLReconnectWaitTime", 0s);
    dbParams.m_wolRetry       = config.GetValue(XmlConfiguration::kDefaultWOL + "SQLConnectRetry", 5);
    dbParams.m_wolCommand     = config.GetValue(XmlConfiguration::kDefaultWOL + "Command", "");
 
    bool ok = dbParams.IsValid(XmlConfiguration::kDefaultFilename);
 
    if (!ok)
        dbParams = {};
 
    dbParams.m_localEnabled = !(dbParams.m_localHostName.isEmpty() ||
        dbParams.m_localHostName == "my-unique-identifier-goes-here");
 
    GetMythDB()->SetDatabaseParams(dbParams);
    return ok;
}
 
QString MythContext::Impl::setLocalHostName(QString hostname)
{
    if (hostname.isEmpty() ||
        hostname == "my-unique-identifier-goes-here")
    {
        LOG(VB_GENERAL, LOG_INFO, "Empty LocalHostName. This is typical.");
        hostname = QHostInfo::localHostName();
 
#ifndef Q_OS_ANDROID
        if (hostname.isEmpty())
        {
            LOG(VB_GENERAL, LOG_ALERT,
                    "MCP: Error, could not determine host name." + ENO);
        }
#else //elif defined Q_OS_ANDROID
#define ANDROID_EXCEPTION_CHECK \
  if (env->ExceptionCheck()) \
  { \
    env->ExceptionClear(); \
    exception=true; \
  }
 
        if ((hostname == "localhost") || hostname.isEmpty())
        {
            hostname = "android";
            bool exception=false;
            QAndroidJniEnvironment env;
            QAndroidJniObject myID = QAndroidJniObject::fromString("android_id");
#if QT_VERSION < QT_VERSION_CHECK(6,0,0)
            QAndroidJniObject activity = QtAndroid::androidActivity();
#else
            QJniObject activity = QNativeInterface::QAndroidApplication::context();
#endif
            ANDROID_EXCEPTION_CHECK;
            QAndroidJniObject appctx = activity.callObjectMethod
                ("getApplicationContext", "()Landroid/content/Context;");
            ANDROID_EXCEPTION_CHECK;
            QAndroidJniObject contentR = appctx.callObjectMethod
                ("getContentResolver", "()Landroid/content/ContentResolver;");
            ANDROID_EXCEPTION_CHECK;
            QAndroidJniObject androidId = QAndroidJniObject::callStaticObjectMethod
                ("android/provider/Settings$Secure", "getString",
                 "(Landroid/content/ContentResolver;Ljava/lang/String;)Ljava/lang/String;",
                 contentR.object<jobject>(),
                 myID.object<jstring>());
            ANDROID_EXCEPTION_CHECK;
            if (exception)
                LOG(VB_GENERAL, LOG_ALERT,
                    "Java exception looking for android id");
            else
                hostname = QString("android-%1").arg(androidId.toString());
        }
#endif
 
    }
 
    LOG(VB_GENERAL, LOG_INFO, QString("Using a profile name of: '%1' (Usually the "
                                      "same as this host's name.)")
                                      .arg(hostname));
    gCoreContext->SetLocalHostname(hostname);
 
    return hostname;
}
 
 
void MythContext::Impl::OnCloseDialog()
{
    if (m_loop && m_loop->isRunning())
    {
        m_loop->exit();
    }
}
 
 
// No longer prompt for database, instaed allow the
// web server to start so that the datbase can be
// set up there
 
bool MythContext::Impl::PromptForDatabaseParams(const QString &error)
{
    bool accepted = false;
    if (m_gui)
    {
        TempMainWindow();
        LanguagePrompt();
 
        // Tell the user what went wrong:
        if (!error.isEmpty())
            ShowOkPopup(error);
 
        // ask user for database parameters
 
        EnableDBerrors();
        MythScreenStack *mainStack = GetMythMainWindow()->GetMainStack();
        auto *dbsetting = new DatabaseSettings();
        auto *ssd = new StandardSettingDialog(mainStack, "databasesettings",
                                              dbsetting);
        if (ssd->Create())
        {
            mainStack->AddScreen(ssd);
            connect(dbsetting, &DatabaseSettings::isClosing,
                this, &MythContext::Impl::OnCloseDialog);
            if (!m_loop->isRunning())
                m_loop->exec();
        }
        else
        {
            delete ssd;
        }
        SilenceDBerrors();
        EndTempWindow();
        accepted = true;
    }
    else
    {
        DatabaseParams params = GetMythDB()->GetDatabaseParams();
        QString        response;
        std::this_thread::sleep_for(1s);
        // give user chance to skip config
        std::cout << std::endl << error.toLocal8Bit().constData() << std::endl << std::endl;
        response = getResponse("Would you like to configure the database "
                               "connection now?",
                               "no");
        if (!response.startsWith('y', Qt::CaseInsensitive))
            return false;
 
        params.m_dbHostName = getResponse("Database host name:",
                                          params.m_dbHostName);
        response = getResponse("Should I test connectivity to this host "
                               "using the ping command?", "yes");
        params.m_dbHostPing = response.startsWith('y', Qt::CaseInsensitive);
 
        params.m_dbPort     = intResponse("Database non-default port:",
                                          params.m_dbPort);
        params.m_dbName     = getResponse("Database name:",
                                          params.m_dbName);
        params.m_dbUserName = getResponse("Database user name:",
                                          params.m_dbUserName);
        params.m_dbPassword = getResponse("Database password:",
                                          params.m_dbPassword);
 
        params.m_localHostName = getResponse("Unique identifier for this machine "
                                             "(if empty, the local host name "
                                             "will be used):",
                                             params.m_localHostName);
        params.m_localEnabled = !params.m_localHostName.isEmpty();
 
        response = getResponse("Would you like to use Wake-On-LAN to retry "
                               "database connections?",
                               (params.m_wolEnabled ? "yes" : "no"));
        params.m_wolEnabled = response.startsWith('y', Qt::CaseInsensitive);
 
        if (params.m_wolEnabled)
        {
            params.m_wolReconnect =
                std::chrono::seconds(intResponse("Seconds to wait for "
                                                 "reconnection:",
                                                 params.m_wolReconnect.count()));
            params.m_wolRetry     = intResponse("Number of times to retry:",
                                                params.m_wolRetry);
            params.m_wolCommand   = getResponse("Command to use to wake server or server MAC address:",
                                                params.m_wolCommand);
        }
 
        accepted = GetMythDB()->SaveDatabaseParams(params, false);
    }
    return accepted;
}
 
QString MythContext::Impl::TestDBconnection(bool prompt)
{
    QString err;
    QString host;
 
    // Jan 20, 2017
    // Changed to use port check instead of ping
 
    int port = 0;
 
    // 1 = db awake, 2 = db listening, 3 = db connects,
    // 4 = backend awake, 5 = backend listening
    // 9 = all ok, 10 = quit
 
    enum  startupStates : std::uint8_t {
        st_start = 0,
        st_dbAwake = 1,
        st_dbStarted = 2,
        st_dbConnects = 3,
        st_beWOL = 4,
        st_beAwake = 5,
        st_success = 6
    } startupState = st_start;
 
    static const std::array<const QString, 7> kGuiStatuses
        {"start", "dbAwake", "dbStarted", "dbConnects", "beWOL", "beAwake", "success"};
 
    auto secondsStartupScreenDelay = gCoreContext->GetDurSetting<std::chrono::seconds>("StartupScreenDelay", 2s);
    auto msStartupScreenDelay = std::chrono::duration_cast<std::chrono::milliseconds>(secondsStartupScreenDelay);
    DatabaseParams dbParams = GetMythDB()->GetDatabaseParams();
    do
    {
        QElapsedTimer timer;
        timer.start();
        if (dbParams.m_dbHostName.isNull() && !m_dbHostCp.isEmpty())
            host = m_dbHostCp;
        else
            host = dbParams.m_dbHostName;
        port = dbParams.m_dbPort;
        if (port == 0)
            port = 3306;
        std::chrono::seconds wakeupTime = 3s;
        int attempts = 11;
        if (dbParams.m_wolEnabled)
        {
            wakeupTime = dbParams.m_wolReconnect;
            attempts = dbParams.m_wolRetry + 1;
            startupState = st_start;
        }
        else
        {
            startupState = st_dbAwake;
        }
        attempts = std::max(attempts, 6);
        if (!prompt)
            attempts=1;
        if (wakeupTime < 5s)
            wakeupTime = 5s;
 
        std::chrono::seconds progressTotal = wakeupTime * attempts;
 
        if (m_guiStartup && !m_guiStartup->m_Exit)
            m_guiStartup->setTotal(progressTotal);
 
        QString beWOLCmd = QString();
        QString backendIP = QString();
        int backendPort = 0;
        QString masterserver;
 
        for (int attempt = 0;
            attempt < attempts && startupState != st_success;
            ++attempt)
        {
            // The first time do everything with minimum timeout and
            // no GUI, for the normal case where all is OK
            // After that show the GUI (if this is a GUI program)
 
            LOG(VB_GENERAL, LOG_INFO,
                 QString("Start up testing connections. DB %1, BE %2, attempt %3, status %4, Delay: %5")
                      .arg(host, backendIP, QString::number(attempt),
                           kGuiStatuses[startupState],
                           QString::number(msStartupScreenDelay.count())) );
 
            std::chrono::seconds useTimeout = wakeupTime;
            if (attempt == 0)
                useTimeout=1s;
 
            if (m_gui && !m_guiStartup)
            {
                if (msStartupScreenDelay==0ms || timer.hasExpired(msStartupScreenDelay.count()))
                {
                    ShowGuiStartup();
                    if (m_guiStartup)
                        m_guiStartup->setTotal(progressTotal);
                }
            }
            if (m_guiStartup && !m_guiStartup->m_Exit)
            {
                if (attempt > 0)
                    m_guiStartup->setStatusState(kGuiStatuses[startupState]);
                m_guiStartup->setMessageState("empty");
                processEvents();
            }
            switch (startupState)
            {
            case st_start:
                if (dbParams.m_wolEnabled)
                {
                    if (attempt > 0)
                        MythWakeup(dbParams.m_wolCommand);
                    if (!checkPort(host, port, useTimeout))
                        break;
                }
                startupState = st_dbAwake;
                [[fallthrough]];
            case st_dbAwake:
                if (!checkPort(host, port, useTimeout))
                    break;
                startupState = st_dbStarted;
                [[fallthrough]];
            case st_dbStarted:
                // If the database is connecting with link-local
                // address, it may have changed
                if (dbParams.m_dbHostName != host)
                {
                    dbParams.m_dbHostName = host;
                    GetMythDB()->SetDatabaseParams(dbParams);
                }
                EnableDBerrors();
                ResetDatabase(dbParams);
                if (!MSqlQuery::testDBConnection())
                {
                    for (std::chrono::seconds temp = 0s; temp < useTimeout * 2 ; temp++)
                    {
                        processEvents();
                        std::this_thread::sleep_for(500ms);
                    }
                    break;
                }
                startupState = st_dbConnects;
                [[fallthrough]];
            case st_dbConnects:
                if (m_needsBackend)
                {
                    beWOLCmd = gCoreContext->GetSetting("WOLbackendCommand", "");
                    if (!beWOLCmd.isEmpty())
                    {
                        wakeupTime += gCoreContext->GetDurSetting<std::chrono::seconds>
                            ("WOLbackendReconnectWaitTime", 0s);
                        attempts += gCoreContext->GetNumSetting
                            ("WOLbackendConnectRetry", 0);
                        useTimeout = wakeupTime;
                        if (m_gui && !m_guiStartup && attempt == 0)
                            useTimeout=1s;
                        progressTotal = wakeupTime * attempts;
                        if (m_guiStartup && !m_guiStartup->m_Exit)
                            m_guiStartup->setTotal(progressTotal);
                        startupState = st_beWOL;
                    }
                }
                else
                {
                    startupState = st_success;
                    break;
                }
                masterserver = gCoreContext->GetSetting
                    ("MasterServerName");
                backendIP = gCoreContext->GetSettingOnHost
                    ("BackendServerAddr", masterserver);
                backendPort = MythCoreContext::GetMasterServerPort();
                [[fallthrough]];
            case st_beWOL:
                if (!beWOLCmd.isEmpty())
                {
                    if (attempt > 0)
                        MythWakeup(beWOLCmd);
                    if (!checkPort(backendIP, backendPort, useTimeout))
                        break;
                }
                startupState = st_beAwake;
                [[fallthrough]];
            case st_beAwake:
                if (!checkPort(backendIP, backendPort, useTimeout))
                    break;
                startupState = st_success;
                [[fallthrough]];
            case st_success:
                // Quiet compiler warning.
                break;
            }
            if (m_guiStartup)
            {
                if (m_guiStartup->m_Exit
                  || m_guiStartup->m_Setup
                  || m_guiStartup->m_Search
                  || m_guiStartup->m_Retry)
                    break;
            }
            processEvents();
        }
        if (startupState == st_success)
            break;
 
        QString stateMsg = kGuiStatuses[startupState];
        stateMsg.append("Fail");
        LOG(VB_GENERAL, LOG_INFO,
             QString("Start up failure. host %1, status %2")
                  .arg(host, stateMsg));
 
        if (m_gui && !m_guiStartup)
        {
            ShowGuiStartup();
            if (m_guiStartup)
                m_guiStartup->setTotal(progressTotal);
        }
 
        if (m_guiStartup
          && !m_guiStartup->m_Exit
          && !m_guiStartup->m_Setup
          && !m_guiStartup->m_Search
          && !m_guiStartup->m_Retry)
        {
            m_guiStartup->updateProgress(true);
            m_guiStartup->setStatusState(stateMsg);
            m_guiStartup->setMessageState("makeselection");
            m_loop->exec();
        }
    }
    while (m_guiStartup && m_guiStartup->m_Retry);
 
    if (startupState < st_dbAwake)
    {
        LOG(VB_GENERAL, LOG_WARNING, QString("Pinging to %1 failed, database will be unavailable").arg(host));
        SilenceDBerrors();
        err = QObject::tr(
            "Cannot find (ping) database host %1 on the network",
            "Backend Setup");
        return err.arg(host);
    }
 
    if (startupState < st_dbConnects)
    {
        SilenceDBerrors();
        return QObject::tr("Cannot login to database", "Backend Setup");
    }
 
    if (startupState < st_success)
    {
        return QObject::tr("Cannot connect to backend", "Backend Setup");
    }
 
    // Current DB connection may have been silenced (invalid):
    EnableDBerrors();
    ResetDatabase(dbParams);
 
    return {};
}
 
// Show the Gui Startup window.
// This is called if there is a delay in startup for any reason
// such as the database being unavailable
void MythContext::Impl::ShowGuiStartup()
{
    if (!m_gui)
        return;
    TempMainWindow();
    MythMainWindow *mainWindow = GetMythMainWindow();
    MythScreenStack *mainStack = mainWindow->GetMainStack();
    if (mainStack)
    {
        if (!m_guiStartup)
        {
            m_guiStartup = new GUIStartup(mainStack, m_loop);
            if (!m_guiStartup->Create())
            {
                delete m_guiStartup;
                m_guiStartup = nullptr;
            }
            if (m_guiStartup)
            {
                mainStack->AddScreen(m_guiStartup, false);
                processEvents();
            }
        }
    }
}
 
void MythContext::Impl::SilenceDBerrors()
{
    // This silences any DB errors from Get*Setting(),
    // (which is the vast majority of them)
    gCoreContext->GetDB()->SetSuppressDBMessages(true);
 
    // Save the configured hostname, so that we can
    // still display it in the DatabaseSettings screens
    DatabaseParams dbParams = GetMythDB()->GetDatabaseParams();
    if (!dbParams.m_dbHostName.isEmpty())
    {
        m_dbHostCp = dbParams.m_dbHostName;
        dbParams.m_dbHostName.clear();
        GetMythDB()->SetDatabaseParams(dbParams);
    }
}
 
void MythContext::Impl::EnableDBerrors()
{
    // Restore (possibly) blanked hostname
    DatabaseParams dbParams = GetMythDB()->GetDatabaseParams();
    if (dbParams.m_dbHostName.isNull() && !m_dbHostCp.isEmpty())
    {
        dbParams.m_dbHostName = m_dbHostCp;
        GetMythDB()->SetDatabaseParams(dbParams);
    }
 
    gCoreContext->GetDB()->SetSuppressDBMessages(false);
}
 
 
void MythContext::Impl::ResetDatabase(const DatabaseParams& dbParams)
{
    auto* db = GetMythDB();
    db->GetDBManager()->CloseDatabases();
    db->SetDatabaseParams(dbParams);
    db->ClearSettingsCache();
}
 
BackendSelection::Decision MythContext::Impl::ChooseBackend(const QString &error)
{
    TempMainWindow();
    LanguagePrompt();
 
    // Tell the user what went wrong:
    if (!error.isEmpty())
    {
        LOG(VB_GENERAL, LOG_ERR, QString("Error: %1").arg(error));
        ShowOkPopup(error);
    }
 
    LOG(VB_GENERAL, LOG_INFO, "Putting up the UPnP backend chooser");
 
    DatabaseParams dbParams = GetMythDB()->GetDatabaseParams();
    BackendSelection::Decision ret =
        BackendSelection::Prompt(&dbParams, XmlConfiguration::kDefaultFilename);
    GetMythDB()->SetDatabaseParams(dbParams);
 
    EndTempWindow();
 
    return ret;
}
 
int MythContext::Impl::UPnPautoconf(const std::chrono::milliseconds milliSeconds)
{
    auto seconds = duration_cast<std::chrono::seconds>(milliSeconds);
    LOG(VB_GENERAL, LOG_INFO, QString("UPNP Search %1 secs")
        .arg(seconds.count()));
 
    SSDP::Instance()->PerformSearch(SSDP::kBackendURI, seconds);
 
    // Search for a total of 'milliSeconds' ms, sending new search packet
    // about every 250 ms until less than one second remains.
    MythTimer totalTime; totalTime.start();
    MythTimer searchTime; searchTime.start();
    while (totalTime.elapsed() < milliSeconds)
    {
        usleep(25000);
        auto ttl = milliSeconds - totalTime.elapsed();
        if ((searchTime.elapsed() > 249ms) && (ttl > 1s))
        {
            auto ttlSeconds = duration_cast<std::chrono::seconds>(ttl);
            LOG(VB_GENERAL, LOG_INFO, QString("UPNP Search %1 secs")
                .arg(ttlSeconds.count()));
            SSDP::Instance()->PerformSearch(SSDP::kBackendURI, ttlSeconds);
            searchTime.start();
        }
    }
 
    SSDPCacheEntries *backends = SSDP::Find(SSDP::kBackendURI);
 
    if (!backends)
    {
        LOG(VB_GENERAL, LOG_INFO, "No UPnP backends found");
        return 0;
    }
 
    int count = backends->Count();
    if (count)
    {
        LOG(VB_GENERAL, LOG_INFO,
            QString("Found %1 UPnP backends").arg(count));
    }
    else
    {
        LOG(VB_GENERAL, LOG_ERR,
            "No UPnP backends found, but SSDP::Find() not NULL");
    }
 
    if (count != 1)
    {
        backends->DecrRef();
        return count;
    }
 
    // Get this backend's location:
    DeviceLocation *BE = backends->GetFirst();
    backends->DecrRef();
    backends = nullptr;
 
    // We don't actually know the backend's access PIN, so this will
    // only work for ones that have PIN access disabled (i.e. 0000)
    int ret = (UPnPconnect(BE, QString())) ? 1 : -1;
 
    BE->DecrRef();
 
    return ret;
}
 
bool MythContext::Impl::DefaultUPnP(QString& Error)
{
    static const QString loc = "DefaultUPnP() - ";
 
    // potentially saved in backendselect
    QString pin;
    QString usn;
    {
        auto config = XmlConfiguration(); // read-only
        pin = config.GetValue(XmlConfiguration::kDefaultPIN, QString(""));
        usn = config.GetValue(XmlConfiguration::kDefaultUSN, QString(""));
    }
 
    if (usn.isEmpty())
    {
        LOG(VB_UPNP, LOG_INFO, loc + "No default UPnP backend");
        return false;
    }
 
    LOG(VB_UPNP, LOG_INFO,
        loc + QString(XmlConfiguration::kDefaultFilename) +
        QString(" has default PIN '%1' and host USN: %2").arg(pin, usn));
 
    // ----------------------------------------------------------------------
 
    std::chrono::milliseconds timeout_ms {2s};
    auto timeout_s = duration_cast<std::chrono::seconds>(timeout_ms);
    LOG(VB_GENERAL, LOG_INFO, loc + QString("UPNP Search up to %1 secs")
        .arg(timeout_s.count()));
    SSDP::Instance()->PerformSearch(SSDP::kBackendURI, timeout_s);
 
    // ----------------------------------------------------------------------
    // We need to give the server time to respond...
    // ----------------------------------------------------------------------
 
    DeviceLocation* devicelocation = nullptr;
    MythTimer totalTime;
    MythTimer searchTime;
    totalTime.start();
    searchTime.start();
    while (totalTime.elapsed() < timeout_ms)
    {
        devicelocation = SSDP::Find(SSDP::kBackendURI, usn);
        if (devicelocation)
            break;
 
        usleep(25000);
 
        auto ttl = timeout_ms - totalTime.elapsed();
        if ((searchTime.elapsed() > 249ms) && (ttl > 1s))
        {
            auto ttlSeconds = duration_cast<std::chrono::seconds>(ttl);
            LOG(VB_GENERAL, LOG_INFO, loc + QString("UPNP Search up to %1 secs")
                .arg(ttlSeconds.count()));
            SSDP::Instance()->PerformSearch(SSDP::kBackendURI, ttlSeconds);
            searchTime.start();
        }
    }
 
    // ----------------------------------------------------------------------
 
    if (!devicelocation)
    {
        Error = "Cannot find default UPnP backend";
        return false;
    }
 
    if (UPnPconnect(devicelocation, pin))
    {
        devicelocation->DecrRef();
        return true;
    }
 
    devicelocation->DecrRef();
    Error = "Cannot connect to default backend via UPnP. Wrong saved PIN?";
    return false;
}
 
bool MythContext::Impl::UPnPconnect(const DeviceLocation *backend,
                                     const QString        &PIN)
{
    QString        error;
    QString        loc = "UPnPconnect() - ";
    QString        URL = backend->m_sLocation;
    MythXMLClient  client(URL);
    DatabaseParams dbParams = GetMythDB()->GetDatabaseParams();
 
    LOG(VB_UPNP, LOG_INFO, loc + QString("Trying host at %1").arg(URL));
    switch (client.GetConnectionInfo(PIN, &dbParams, error))
    {
        case UPnPResult_Success:
            GetMythDB()->SetDatabaseParams(dbParams);
            LOG(VB_UPNP, LOG_INFO, loc +
                "Got database hostname: " + dbParams.m_dbHostName);
            return true;
 
        case UPnPResult_ActionNotAuthorized:
            // The stored PIN is probably not correct.
            // We could prompt for the PIN and try again, but that needs a UI.
            // Easier to fail for now, and put up the full UI selector later
            LOG(VB_UPNP, LOG_ERR, loc + "Wrong PIN?");
            return false;
 
        default:
            LOG(VB_UPNP, LOG_ERR, loc + error);
            break;
    }
 
    // This backend may have a local DB with the default user/pass/DBname.
    // For whatever reason, we have failed to get anything back via UPnP,
    // so we might as well try the database directly as a last resort.
    QUrl theURL(URL);
    URL = theURL.host();
    if (URL.isEmpty())
        return false;
 
    LOG(VB_UPNP, LOG_INFO, "Trying default DB credentials at " + URL);
    dbParams.m_dbHostName = URL;
    GetMythDB()->SetDatabaseParams(dbParams);
 
    return true;
}
 
bool MythContext::Impl::event(QEvent *e)
{
    if (e->type() == MythEvent::kMythEventMessage)
    {
        if (m_disableeventpopup)
            return true;
 
        if (GetNotificationCenter() && m_registration < 0)
        {
            m_registration = GetNotificationCenter()->Register(this);
        }
 
        auto *me = dynamic_cast<MythEvent*>(e);
        if (me == nullptr)
            return true;
 
        if (me->Message() == "VERSION_MISMATCH" && (1 == me->ExtraDataCount()))
            ShowVersionMismatchPopup(me->ExtraData(0).toUInt());
        else if (me->Message() == "CONNECTION_FAILURE")
            ShowConnectionFailurePopup(false);
        else if (me->Message() == "PERSISTENT_CONNECTION_FAILURE")
            ShowConnectionFailurePopup(true);
        else if (me->Message() == "CONNECTION_RESTABLISHED")
            HideConnectionFailurePopup();
        return true;
    }
 
    return QObject::event(e);
}
 
void MythContext::Impl::ShowConnectionFailurePopup(bool persistent)
{
    QDateTime now = MythDate::current();
 
    if (!GetNotificationCenter() || !m_ui || !m_ui->IsScreenSetup())
        return;
 
    if (m_lastCheck.isValid() && now < m_lastCheck)
        return;
 
    // When WOL is disallowed, standy mode,
    // we should not show connection failures.
    if (!gCoreContext->IsWOLAllowed())
        return;
 
    m_lastCheck = now.addMSecs(5000); // don't refresh notification more than every 5s
 
    QString description = (persistent) ?
        QObject::tr(
            "The connection to the master backend "
            "server has gone away for some reason. "
            "Is it running?") :
        QObject::tr(
            "Could not connect to the master backend server. Is "
            "it running?  Is the IP address set for it in "
            "mythtv-setup correct?");
 
    QString message = QObject::tr("Could not connect to master backend");
    MythErrorNotification n(message, sLocation, description);
    n.SetId(m_registration);
    n.SetParent(this);
    GetNotificationCenter()->Queue(n);
}
 
void MythContext::Impl::HideConnectionFailurePopup()
{
    if (!GetNotificationCenter())
        return;
 
    if (!m_lastCheck.isValid())
        return;
 
    MythCheckNotification n(QObject::tr("Backend is online"), sLocation);
    n.SetId(m_registration);
    n.SetParent(this);
    n.SetDuration(5s);
    GetNotificationCenter()->Queue(n);
    m_lastCheck = QDateTime();
}
 
void MythContext::Impl::ShowVersionMismatchPopup(uint remote_version)
{
    if (m_mbeVersionPopup)
        return;
 
    QString message =
        QObject::tr(
            "The server uses network protocol version %1, "
            "but this client only understands version %2.  "
            "Make sure you are running compatible versions of "
            "the backend and frontend.")
        .arg(remote_version).arg(MYTH_PROTO_VERSION);
 
    if (HasMythMainWindow() && m_ui && m_ui->IsScreenSetup())
    {
        m_mbeVersionPopup = ShowOkPopup(
            message, this, &MythContext::Impl::VersionMismatchPopupClosed);
    }
    else
    {
        LOG(VB_GENERAL, LOG_ERR, LOC + message);
        qApp->exit(GENERIC_EXIT_SOCKET_ERROR);
    }
}
 
// Process Events while waiting for connection
// return true if progress is 100%
void MythContext::Impl::processEvents()
{
//    bool ret = false;
//    if (m_guiStartup)
//        ret = m_guiStartup->updateProgress();
    qApp->processEvents(QEventLoop::AllEvents, 250);
    qApp->processEvents(QEventLoop::AllEvents, 250);
//    return ret;
}
 
namespace
{
// cache some settings in GUISettingsCache::m_cacheFilename
// only call this if the database is available.
 
const std::array<QString, 13> GUISettingsCache::kSettings
{ "Theme", "Language", "Country", "GuiHeight",
  "GuiOffsetX", "GuiOffsetY", "GuiWidth", "RunFrontendInWindow",
  "AlwaysOnTop", "HideMouseCursor", "ThemePainter", "libCECEnabled",
  "StartupScreenDelay" };
 
 
bool GUISettingsCache::save()
{
    QString cacheDirName = GetConfDir() + '/' + m_cachePath;
    QDir dir(cacheDirName);
    dir.mkpath(cacheDirName);
    XmlConfiguration config = XmlConfiguration(m_cacheFilename);
    bool dirty = false;
    for (const auto & setting : kSettings)
    {
        QString cacheValue = config.GetValue("Settings/" + setting, QString());
        gCoreContext->ClearOverrideSettingForSession(setting);
        QString value = gCoreContext->GetSetting(setting, QString());
        if (value != cacheValue)
        {
            config.SetValue("Settings/" + setting, value);
            dirty = true;
        }
    }
    clearOverrides();
 
    if (dirty)
    {
#ifndef Q_OS_ANDROID
        DestroyMythMainWindow();
#endif
        return config.Save();
    }
    return true;
}
 
void GUISettingsCache::loadOverrides() const
{
    auto config = XmlConfiguration(m_cacheFilename); // read only
    for (const auto & setting : kSettings)
    {
        if (!gCoreContext->GetSetting(setting, QString()).isEmpty())
            continue;
        QString value = config.GetValue("Settings/" + setting, QString());
        if (!value.isEmpty())
            gCoreContext->OverrideSettingForSession(setting, value);
    }
    // Prevent power off TV after temporary window
    gCoreContext->OverrideSettingForSession("PowerOffTVAllowed", nullptr);
 
    MythTranslation::load("mythfrontend");
}
 
void GUISettingsCache::clearOverrides()
{
    QString language = gCoreContext->GetSetting("Language", QString());
    for (const auto & setting : kSettings)
        gCoreContext->ClearOverrideSettingForSession(setting);
    // Restore power off TV setting
    gCoreContext->ClearOverrideSettingForSession("PowerOffTVAllowed");
 
    if (language != gCoreContext->GetSetting("Language", QString()))
        MythTranslation::load("mythfrontend");
}
 
} // anonymous namespace
 
void MythContext::Impl::VersionMismatchPopupClosed()
{
    m_mbeVersionPopup = nullptr;
    qApp->exit(GENERIC_EXIT_SOCKET_ERROR);
}
 
MythContext::MythContext(QString binversion, bool needsBackend)
    : m_impl(new MythContext::Impl()),
      m_appBinaryVersion(std::move(binversion))
{
#ifdef _WIN32
    static bool WSAStarted = false;
    if (!WSAStarted)
    {
        WSADATA wsadata;
        int res = WSAStartup(MAKEWORD(2, 0), &wsadata);
        LOG(VB_SOCKET, LOG_INFO,
                 QString("WSAStartup returned %1").arg(res));
    }
#endif
 
    SignalHandler::Init();
    m_impl->m_needsBackend = needsBackend;
 
    gCoreContext = new MythCoreContext(m_appBinaryVersion, m_impl);
 
    if (!gCoreContext || !gCoreContext->Init())
    {
        LOG(VB_GENERAL, LOG_EMERG, LOC + "Unable to allocate MythCoreContext");
        qApp->exit(GENERIC_EXIT_NO_MYTHCONTEXT);
    }
}
 
bool MythContext::Init(const bool gui,
                       const bool promptForBackend,
                       const bool disableAutoDiscovery,
                       const bool ignoreDB)
{
    if (!m_impl)
    {
        LOG(VB_GENERAL, LOG_EMERG, LOC + "Init() Out-of-memory");
        return false;
    }
 
    qRegisterMetaType<std::chrono::seconds>("std::chrono::seconds");
    qRegisterMetaType<std::chrono::milliseconds>("std::chrono::milliseconds");
    qRegisterMetaType<std::chrono::microseconds>("std::chrono::microseconds");
 
    SetDisableEventPopup(true);
 
    if (gui && QCoreApplication::applicationName() == MYTH_APPNAME_MYTHTV_SETUP)
    {
        m_impl->TempMainWindow();
        QString warning = QObject::tr("mythtv-setup is deprecated.\n"
                "To set up MythTV, start mythbackend and use:\n"
                "http://localhost:6544/setupwizard");
        WaitFor(ShowOkPopup(warning));
    }
 
    if (m_appBinaryVersion != MYTH_BINARY_VERSION)
    {
        LOG(VB_GENERAL, LOG_EMERG,
                 QString("Application binary version (%1) does not "
                         "match libraries (%2)")
                     .arg(m_appBinaryVersion, MYTH_BINARY_VERSION));
 
        QString warning = QObject::tr(
            "This application is not compatible "
            "with the installed MythTV libraries.");
        if (gui)
        {
            m_impl->TempMainWindow();
            WaitFor(ShowOkPopup(warning));
        }
        LOG(VB_GENERAL, LOG_WARNING, warning);
 
        return false;
    }
 
#ifdef _WIN32
    // HOME environment variable might not be defined
    // some libraries will fail without it
    QString home = getenv("HOME");
    if (home.isEmpty())
    {
        home = getenv("LOCALAPPDATA");      // Vista
        if (home.isEmpty())
            home = getenv("APPDATA");       // XP
        if (home.isEmpty())
            home = QString(".");  // getenv("TEMP")?
 
        _putenv(QString("HOME=%1").arg(home).toLocal8Bit().constData());
    }
#endif
 
    // If HOME isn't defined, we won't be able to use default confdir of
    // $HOME/.mythtv nor can we rely on a MYTHCONFDIR that references $HOME
    QString homedir = QDir::homePath();
    QString confdir = qEnvironmentVariable("MYTHCONFDIR");
    if ((homedir.isEmpty() || homedir == "/") &&
        (confdir.isEmpty() || confdir.contains("$HOME")))
    {
        QString warning = "Cannot locate your home directory."
                          " Please set the environment variable HOME";
        if (gui)
        {
            m_impl->TempMainWindow();
            WaitFor(ShowOkPopup(warning));
        }
        LOG(VB_GENERAL, LOG_WARNING, warning);
 
        return false;
    }
 
    if (!m_impl->Init(gui, promptForBackend, disableAutoDiscovery, ignoreDB))
    {
        return false;
    }
 
    SetDisableEventPopup(false);
 
    if (m_impl->m_gui)
    {
        saveSettingsCache();
    }
 
    gCoreContext->ActivateSettingsCache(true);
    gCoreContext->InitPower();
 
    return true;
}
 
MythContext::~MythContext()
{
    if (m_cleanup != nullptr)
    {
        m_cleanup();
    }
 
    if (m_impl->m_gui)
    {
        DestroyMythMainWindow();
    }
 
    SignalHandler::Done();
    gCoreContext->InitPower(false /*destroy*/);
    if (MThreadPool::globalInstance()->activeThreadCount())
        LOG(VB_GENERAL, LOG_INFO, "Waiting for threads to exit.");
 
    MThreadPool::globalInstance()->waitForDone();
    SSDP::Shutdown();
    TaskQueue::Shutdown();
 
    LOG(VB_GENERAL, LOG_INFO, "Exiting");
 
    logStop();
 
    delete gCoreContext;
    gCoreContext = nullptr;
 
    delete m_impl;
 
    ReferenceCounter::PrintDebug();
}
 
void MythContext::SetDisableEventPopup(bool check)
{
    m_impl->m_disableeventpopup = check;
}
 
bool MythContext::saveSettingsCache()
{
    /* this check is technically redundant since this is only called from
    MythContext::Init() and mythfrontend::main(); however, it is for safety
    and clarity until MythGUIContext is refactored out.
    */
    if (m_impl->m_gui)
    {
        return m_impl->m_GUISettingsCache.save();
    }
    return true;
}
 
#include "mythcontext.moc"
 
/* vim: set expandtab tabstop=4 shiftwidth=4: */