The document presents an overview of Flatpak, a technology for creating standalone Linux application packages that can work across various distributions and versions. It details its benefits, such as using sandboxes to isolate applications and employing a versioning system for management. The author, Jens Petersen, outlines Flatpak's components, installation process, and its integration with other tools and initiatives in the Linux ecosystem.

1. presented by
Jens Petersen
Generic standalone
Linux app packages

2. About me: Jens Petersen
Worked on Fedora since the beginning
Red Hat i18n software engineering manager in Japan
Member of the Fedora Workstation WG
Disclaimer: not a Flatpak contributor/expert

3. Introduction
Packaging applications for generic Linux is painful
Different distributions in multiple versions,
each with their own versions of libraries and packaging formats

4. Flatpack
is here to change that
● Flatpak apps can be installed on different distros and versions
● Uses sandboxes to isolate binary apps from your system
Flatpak assumes Linux

5. Author
Flatpak is created and authored by Alex Larsson
Flatpak was formerly called xdg-app
https://2016.guadec.org/tag/flatpak/

6. How?
http://flatpak.org/#about

7. Concepts
● Runtimes
● Bundled libraries
● SDKs
● Sandboxes
http://flatpak.org/developer.html

8. Identifiers
Flatpak identifies runtimes, SDKs and applications by a triple of:
name/arch/branch
● name is in inverse-dns notation
○ needs to match the D-Bus name used for the application
○ Eg org.gnome.Sdk/x86_64/3.14 or org.gnome.Builder/i386/master

9. Technologies
Many of the important ingredients for Flatpak are inherited from Linux containers
and related initiatives:
● bubblewrap utility from Project Atomic lets unprivileged users set up and run
containers, using kernel features like Cgroups, Namespaces, Bind mounts,
Seccomp rules
● systemd to set up cgroups for the sandbox
● D-Bus, a well-established way to provide high-level APIs to applications
● OCI format from the Open Container Initiative, as a convenient transport
format for single-file bundles
● The OSTree system for versioning and distributing filesystem trees
● Appstream metadata for Flatpak apps to show up in Gnome Software

10. Anatomy of a flatpak app
http://flatpak.org/developer.html#Anatomy_of_a_Flatpak_App
No package versions?

11. Sandboxes
http://flatpak.org/developer.html#Working_with_the_Sandbox

12. Installation
Flatpak is available in Fedora, Ubuntu, Debian, etc
$ flatpak --help

13. Demo

14. Running
Let’s try http://flatpak.org/index.html#users

15. Build
We will try http://flatpak.org/index.html#developers

16. Tools, IDE
● flatpak-builder
● GNOME Builder and Software support flatpak
○ since 3.20, improved in 3.22

17. Alternatives
Snap from Ubuntu
Nix/guix
AppImage

18. Thank you
Contributing:
● Homepage: http://flatpak.org/
● Mailing list: http://lists.freedesktop.org/mailman/listinfo/xdg-app
● IRC: #flatpak on Freenode
● Github: https://github.com/flatpak/flatpak