Using QAppImageUpdate Plugin in PyQt5

This guide Demonstrates how to use the QAppImageUpdate plugin to update a single AppImage file. This example assumes you are using PyQt5 as your python binding to Qt framework.

Note that if the plugin is placed in the predefined Qt Plugin path, then you don't need the absolute path of the plugin. Simply set the file name to 'libQAppImageUpdate'.

Building the Plugin

 $ git clone https://github.com/antony-jr/QAppImageUpdate
 $ cd QAppImageUpdate
 $ mkdir build
 $ cd build 
 $ cmake -DBUILD_AS_PLUGIN ..
 $ make -j$(nproc)
 $ export PLUGIN_PATH=$(pwd)/libQAppImageUpdate.so

Update.py

#!/usr/bin/env python3
import os
import sys
from PyQt5.QtCore import QPluginLoader
from PyQt5.QtCore import QCoreApplication

if len(sys.argv) < 2:
    print("Usage: ./Update.py [APPIMAGE PATH]")
    sys.exit(0)

app = QCoreApplication(sys.argv)

# Try to load the plugin from predefined 
# Qt Plugin paths.
loader = QPluginLoader()
loader.setFileName('libQAppImageUpdate')
if not loader.load():
    try:
        plugin_path = os.eviron['PLUGIN_PATH']
    except:
        print("Unable to resolve plugin path.")
        sys.exit(0)
    loader.setFileName(plugin_path)
    if not loader.load():
        print("Cannot load plugin because: {}".format(loader.errorString()))
        sys.exit(-1)


appimage_path = sys.argv[1]
obj = loader.instance()

def handleFinish(info, action):
    if action == obj.getConstant("Action::CheckForUpdate"):
    if info["UpdateAvailable"].toBool():
            print("A new version of the AppImage is available.")
            print("Updating now... ")
            obj.start(obj.getConstant("Action::Update"))
    elif action == obj.getConstant("Action::Update"):
        print(info)
        app.quit()
   
def handleError(code):
    print("ERROR: {}".format(obj.errorCodeToDescriptionString(code)))
    app.quit()

obj.finished.connect(handleFinish)
obj.error.connect(handleError)

obj.setAppImagePath(appimage_path)

print("Checking for Update... ")
obj.start(obj.getContant("Action::CheckForUpdate"))
sys.exit(app.exec_())

Execution

 $ chmod +x Update.py
 $ ./Update.py some.AppImage

See the examples directory in the source tree for more examples.