Updating an AppImage with BitTorrent

This guide Demonstrates how to use the QAppImageUpdate APIs for updating a single AppImage file using Zsync + BitTorrent. This example parses the path from the program arguments.

main.cpp

#include <QCoreApplication>
#include <QDebug>
#include <QAppImageUpdate>

int main(int ac , char **av)
{
    if(ac == 1){
        qInfo() << "Usage: " << av[0] << " [APPIMAGE PATH]";
        return 0;   
        }
    
    QCoreApplication app(ac , av);
    QString AppImagePath = QString(av[1]);

    QAppImageUpdate updater(AppImagePath);
    QObject::connect(&updater , &QAppImageUpdate::finished ,
        [&](QJsonObject newVersionDetails , short action){
        if(action == QAppImageUpdate::Action::Update) {
            qInfo() << "New Version Details:: " << newVersionDetails;
            app.quit();
        }
    });
    QObject::connect(&updater, &QAppImageUpdate::error ,
        [&](short e){
        qInfo() << "error:: " << QAppImageUpdate::errorCodeToString(e);
        app.quit();
    });
    updater.setShowLog(true); // Display log?
    

    /// This line is the only thing that changes.
    updater.start(QAppImageUpdate::Action::UpdateWithTorrent);
    return app.exec();
}
 

update.pro

include(QAppImageUpdate/QAppImageUpdate.pri)
TEMPLATE = app
TARGET = update
SOURCES += main.cpp

Compilation and Execution

 $ mkdir build
 $ cd build
 $ qmake ..
 $ make -j$(nproc)
 $ ./update some.AppImage

A advanced verison of this program has been implemented in the examples directory.