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Package Manager Hook Guide

Overview

DDE Application Manager uses a package manager hook to automatically detect application installations, updates, and removals. The hook triggers a D-Bus service that notifies the application manager to reload the application list.

⚠️ Without this hook, the application list will NOT automatically update when users install or remove applications.

How It Works

Package Manager Operation → Hook Triggered → D-Bus Signal → Application List Reloaded

The hook calls:

busctl call org.desktopspec.ApplicationUpdateNotifier1 \
    /org/desktopspec/ApplicationUpdateNotifier1 \
    org.freedesktop.DBus.Peer Ping

Hook Configuration

Debian/Ubuntu (dpkg/apt)

File: /etc/dpkg/dpkg.cfg.d/am-update-hook

post-invoke="busctl call org.desktopspec.ApplicationUpdateNotifier1 /org/desktopspec/ApplicationUpdateNotifier1 org.freedesktop.DBus.Peer Ping &> /dev/null || /bin/true"

Notes for Package Maintainers

  • The hook must be installed for automatic application list updates to work
  • The hook should never fail package operations (use || /bin/true)
  • Ensure D-Bus service files and systemd unit files are properly installed