Software:PackageKit

PackageKit

PackageKit is a system daemon, various graphical front-ends are available
Original author(s)	Richard Hughes
Initial release	2007 (2007)
Written in	C, C++, Python
Operating system	Linux
Type	Package management system
License	GNU General Public License
Website	www.freedesktop.org/software/PackageKit/

PackageKit is a free and open-source suite of software applications designed to provide a consistent and high-level front end for a number of different package management systems. PackageKit was created by Richard Hughes in 2007, and first introduced into an operating system as a default application in May 2008 with the release of Fedora 9.

The suite is cross-platform, though it is primarily targeted at Linux distributions which follow the interoperability standards set out by the freedesktop.org group. It uses the software libraries provided by the D-Bus and Polkit projects to handle inter-process communication and privilege negotiation respectively.

PackageKit seeks to introduce automatic updates without having to authenticate as root, fast-user-switching, warnings translated into the correct locale, common upstream GNOME and KDE tools and one software over multiple Linux distributions.

Although bug fixes are still released, no major features have been developed since around 2014, and the package's maintainer predicts that it will gradually be replaced by other tools as technologies such as Flatpak and Snap become more popular.

Software architecture

PackageKit runs as a system-activated daemon, named packagekitd, which abstracts out differences between the different systems. A library called libpackagekit allows other programs to interact with PackageKit.

Features include:

• installing local files, ServicePack media and packages from remote sources
• authorization using Polkit
• the use of existing packaging tools
• multi-user system awareness – it will not allow shutdown in critical parts of the transaction
• a system-activated daemon which exits when not in use

Front-ends

gnome-packagekit 3.32 (released in 2019-03)

• pkcon is the official front-end of PackageKit, it operates from the command line.

GTK-based:

• gnome-packagekit is an official GNOME front-end for PackageKit. Unlike GNOME Software, gnome-packagekit can handle all packages, not just applications, and has advanced features that are missing in GNOME Software as of June 2020.
• GNOME Software is a utility for installing the applications and updates on Linux. It is part of the GNOME Core Applications and was introduced in GNOME 3.10.

Qt-based:

• 

  Apper

• 

  Discover

Back-ends

A number of different package management systems (known as back-ends) support different abstract methods and signals used by the front-end tools. Supported back-ends include:

• Advanced Packaging Tool (APT)
• Conary
• libdnf & librepo, the libraries upon which DNF, (the successor to yum) builds
• Entropy
• Opkg
• pacman
• PiSi
• Portage
• Smart Package Manager
• urpmi
• YUM
• ZYpp

See also

• AppStream
• Listaller
• Polkit
• Red Carpet
• Software Updater
• List of Linux package management systems