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[https://www.flatpak.org/ Flatpak] is a linux application sandboxing and distribution framework  
[https://www.flatpak.org/ Flatpak] is a Linux application sandboxing and distribution framework.
 
This article extends the documentation in the [https://nixos.org/manual/nixos/stable/#module-services-flatpak NixOS manual].
 
== Installation ==
 
=== Global ===
Using this configuration, <code>flatpak</code> will be installed and ready to use globally for all users:
{{file|3=services.flatpak.enable = true;|name=/etc/nixos/configuration.nix|lang=nix}}
=== Per-User ===
If you'd rather make Flatpak available to a specific user, add <code>flatpak</code> to that user's packages
 
{{file|3=users.users."user" = {
    packages = with pkgs; [
      flatpak
    ];
  };|name=/etc/nixos/configuration.nix|lang=nix}}
 
=== Window Managers / Compositors Patches ===
After adding the desired solution to your configuration file, Flatpak will be installed, but it is not always added to your path directly, e.g. when you are using Sway.
 
To manually add it to the path while using the [[Greetd]] login manager and [[Sway]], create a <code>.profile</code> file with an override for your <code>XDG_DATA_DIRS</code> path, e.g.:
{{file|3=export XDG_DATA_DIRS=$XDG_DATA_DIRS:/usr/share:/var/lib/flatpak/exports/share:$HOME/.local/share/flatpak/exports/share|name=.profile|lang=}}
This is also required when installing <code>flatpak</code> on a per-user basis.


== Usage ==
== Usage ==


Using this configuration, <code>flatpak</code> will be installed and ready for use:
=== Declarative ===
{{file|/etc/nixos/configuration.nix|nix|<nowiki>
To manage Flatpak declaratively, you can either use [https://github.com/gmodena/nix-flatpak nix-flatpak] or [https://github.com/in-a-dil-emma/declarative-flatpak declarative-flatpak]
services.flatpak.enable = true;
 
</nowiki>}}
In the event of a Nix rollback, both modules will reinstall the previously declared Flatpak packages
 
{{Expand|reason=Exemples are missing|scope=section}}
 
==== [https://github.com/gmodena/nix-flatpak nix-flatpak] ====
A convergent approach to Flatpak management where refs are managed in place
 
Flatpak packages are not cached in the Nix store
 
It supports flakes or [[Home Manager|home-manager]], but doesn't support non-flakes only
 
<small>For more details, see [https://github.com/gmodena/nix-flatpak/discussions/168 nix-flatpak/discussions/168]</small>
 
==== [https://github.com/in-a-dil-emma/declarative-flatpak declarative-flatpak] ====
A congruent approach to Flatpak management where changes are designed to be atomic, ensuring that either they succeed or nothing happens. This module uses a temporary installation and then overwrites the current one.
 
It supports non-flake, flakes, and [[Home Manager|home-manager]]
 
<small>For more details, see [https://github.com/in-a-dil-emma/declarative-flatpak/issues/44 declarative-flatpak/issues/44]</small>
 
=== Imperative ===
 
==== Terminal User Interface ====
To manage Flatpak imperatively, you can use [https://docs.flatpak.org/en/latest/using-flatpak.html the <code>flatpak</code> command] ([https://docs.flatpak.org/en/latest/flatpak-command-reference.html <code>flatpak</code> Command Reference Documentation])
 
===== Example =====
<syntaxhighlight lang="console">$ flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
$ flatpak update
$ flatpak search Flatseal
$ flatpak install flathub com.github.tchx84.Flatseal
$ flatpak run com.github.tchx84.Flatseal</syntaxhighlight>
 
==== Graphical User Interface ====
To install Flatpaks graphically, you can use [https://apps.gnome.org/en-GB/Software/ the GNOME Software Application] ([https://search.nixos.org/packages?show=gnome-software <code>gnome-software</code> in nixpkgs])
 
<small>'''Note''': installing Flatpaks through it is imperative</small>
 
==== Configure Repositories Globally ====
{{Warning|This assumes you are not installing Flatpak packages [https://wiki.nixos.org/wiki/Flatpak#Declarative declaratively] (using [https://wiki.nixos.org/wiki/Flatpak#nix-flatpak nix-flatpak] or [https://wiki.nixos.org/wiki/Flatpak#declarative-flatpak declarative-flatpak])
 
Otherwise, the following section could conflict with them
 
If you are, prefer using [https://wiki.nixos.org/wiki/Flatpak#nix-flatpak nix-flatpak]'s <code>services.flatpak.remotes</code> or [https://wiki.nixos.org/wiki/Flatpak#declarative-flatpak declarative-flatpak]'s <code>services.flatpak.remotes</code> instead}}
To automatically configure Flatpak repositories for all users, one can add this snippet to <code>configuration.nix</code>:{{file|3=systemd.services.flatpak-repo = {
    wantedBy = [ "multi-user.target" ];
    path = [ pkgs.flatpak ];
    script = ''
      flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
    '';
  };|name=/etc/nixos/configuration.nix|lang=nix}}
 
== Development ==
 
=== Build a Flatpak project ===
 
The following example builds a demo app of the [https://github.com/GNOME/libadwaita libadwaita] repository using <code>flatpak-builder</code>, installs it locally in the user space and runs it. First install <code>flatpak</code> and <code>flatpak-builder</code> on your system
 
{{file|3=services.flatpak.enable = true;
environment.systemPackages = [
  pkgs.flatpak-builder
];|name=/etc/nixos/configuration.nix|lang=nix}}
 
Clone, build and run the example project.
 
<syntaxhighlight lang="console">$ flatpak remote-add --if-not-exists gnome-nightly https://nightly.gnome.org/gnome-nightly.flatpakrepo
$ flatpak install gnome-nightly org.gnome.Sdk org.gnome.Platform
$ git clone https://gitlab.gnome.org/GNOME/libadwaita.git
$ cd libadwaita
$ nix shell nixpkgs#appstream
$ flatpak-builder --disable-tests --user --install build demo/org.gnome.Adwaita1.Demo.json
$ flatpak run org.gnome.Adwaita1.Demo.json</syntaxhighlight>
 
Note that the <code>gnome-nightly</code> repository and the <code>appstream</code> dependency are especially required for this specific project and might be different for other Flatpak projects.
 
== Tips and tricks ==
 
=== Emulate Flatpaks of different architecture ===
It is possible to install and run Flatpaks which were compiled for a different platform.
 
In this example we imperatively install the application "Metronome" <code>aarch64</code> Flatpak package and run it (regardless of the architecture of the host, but in that case, it was <code>x86_64</code>):<syntaxhighlight lang="console">$ flatpak install flathub com.adrienplazas.Metronome --arch=aarch64
$ flatpak run com.adrienplazas.Metronome</syntaxhighlight>To support emulation with Qemu, [[QEMU#Run binaries of different architecture|following Binfmt configuration]] is required.


After adding this line to your configuration file, flatpak will be installed, however it is not always added yo your path directly, e.g. when you are using sway it will be not.
== Troubleshooting ==


To manually add it to path while using a [https://nixos.wiki/wiki/Greetd greetd] login manager and [https://nixos.wiki/wiki/Sway Sway] create a <code>.profile</code> file with an override for your <code>XDG_DATA_DIRS</code> path, e.g.:
=== Missing themes and cursors ===
{{file|.profile|nix|<nowiki>
export XDG_DATA_DIRS:$XDG_DATA_DIRS:/usr/share:/var/lib/flatpak/exports/share:$HOME/.local/share/flatpak/exports/share
</nowiki>}}


If you have issues with cursors or themes in general, take a look at [[Fonts#Flatpak_applications_can't_find_system_fonts]]


== Issues ==
[[Category:Software]]
If you have issues with cursors or themes in general, take a look at [https://nixos.wiki/wiki/Fonts#Flatpak_applications_can.27t_find_system_fonts Fonts]
[[Category:NixOS Manual]]
Retrieved from "https://wiki.nixos.org/wiki/Flatpak"