Updating an AppImage

This guide Demonstrates how to use the AppImageUpdaterBridge APIs for updating a single AppImage file. This example parses the path from the program arguments , And uses the AppImageDeltaRevisioner class to perform the actual delta update.

main.cpp

#include <QCoreApplication>
#include <QDebug>
#include <AppImageUpdaterBridge>

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

    AppImageDeltaRevisioner DRevisioner(AppImagePath);
    QObject::connect(&DRevisioner , &AppImageDeltaRevisioner::finished ,
        [&](QJsonObject newVersionDetails , QString oldVersionPath){
        (void)oldVersionPath;
        qInfo() << "New Version Details:: " << newVersionDetails;
        app.quit();
    });
    QObject::connect(&DRevisioner , &AppImageDeltaRevisioner::error ,
        [&](short e){
        qInfo() << "error:: " << AppImageUpdaterBridge::errorCodeToString(e);
        app.quit();
    });
    DRevisioner.setShowLog(true); // Display log?
    
    DRevisioner.start(); /* Start the update. */
    return app.exec();
}
 

update.pro

include(AppImageUpdaterBridge/AppImageUpdaterBridge.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.