main.cpp

/**********************************************************************
 *  main.cpp
 **********************************************************************
 * Copyright (C) 2017 MX Authors
 *
 * Authors: Adrian
 *          Dolphin_Oracle
 *          MX Linux <http://mxlinux.org>
 *
 * This file is part of mx-packageinstaller.
 *
 * mx-packageinstaller is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * mx-packageinstaller is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with mx-packageinstaller.  If not, see <http://www.gnu.org/licenses/>.
 **********************************************************************/

#include <QApplication>
#include <QDate>
#include <QDebug>
#include <QIcon>
#include <QLibraryInfo>
#include <QLocale>
#include <QTranslator>

#include "mainwindow.h"
#include "lockfile.h"
#include <unistd.h>


static QFile logFile;

void messageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg);

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    app.setWindowIcon(QIcon::fromTheme(app.applicationName()));
    app.setOrganizationName("MX-Linux");

    QTranslator qtTran;
    if (qtTran.load(QLocale::system(), "qt", "_", QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(&qtTran);

    QTranslator qtBaseTran;
    if (qtBaseTran.load("qtbase_" + QLocale::system().name(), QLibraryInfo::location(QLibraryInfo::TranslationsPath)))
        app.installTranslator(&qtBaseTran);

    QTranslator appTran;
    if (appTran.load(app.applicationName() + "_" + QLocale::system().name(), "/usr/share/" + app.applicationName() + "/locale"))
        app.installTranslator(&appTran);

    // Root guard
    if (system("logname |grep -q ^root$") == 0) {
        QMessageBox::critical(nullptr, QObject::tr("Error"),
                              QObject::tr("You seem to be logged in as root, please log out and log in as normal user to use this program."));
        exit(EXIT_FAILURE);
    }

    if (getuid() == 0) {
        // Don't start app if Synaptic/apt-get is running, lock dpkg otherwise while the program runs
        LockFile lock_file("/var/lib/dpkg/lock");
        if (lock_file.isLocked()) {
            QApplication::beep();
            QMessageBox::critical(nullptr, QObject::tr("Unable to get exclusive lock"),
                                  QObject::tr("Another package management application (like Synaptic or apt-get), "\
                                                   "is already running. Please close that application first"));
            return EXIT_FAILURE;
        } else {
            lock_file.lock();
        }
        QString log_name = "/var/log/mxpi.log";
        if (QFile::exists(log_name)) {
            system("echo '-----------------------------------------------------------\nMXPI SESSION\
                   \n-----------------------------------------------------------' >> " + log_name.toUtf8() + ".old");
            system("cat " + log_name.toUtf8() + " >> " + log_name.toUtf8() + ".old");
            QFile::remove(log_name);
        }
        logFile.setFileName(log_name);
        logFile.open(QFile::Append | QFile::Text);
        qInstallMessageHandler(messageHandler);

        MainWindow w;
        w.show();
        return app.exec();
    } else {
        system("su-to-root -X -c " + QApplication::applicationFilePath().toUtf8() + "&");
    }
}


// The implementation of the handler
void messageHandler(QtMsgType type, const QMessageLogContext &context, const QString &msg)
{
    QTextStream term_out(stdout);
    term_out << msg << QStringLiteral("\n");

    QTextStream out(&logFile);
    out << QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss.zzz ");
    switch (type)
    {
    case QtInfoMsg:     out << QStringLiteral("INF "); break;
    case QtDebugMsg:    out << QStringLiteral("DBG "); break;
    case QtWarningMsg:  out << QStringLiteral("WRN "); break;
    case QtCriticalMsg: out << QStringLiteral("CRT "); break;
    case QtFatalMsg:    out << QStringLiteral("FTL "); break;
    }
    out << context.category << QStringLiteral(": ") << msg << QStringLiteral("\n");
}