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m style fixes :-)
Move the Flatpak font fix stuff into a new page as it is also applicable for things outside of Flatpaks and the same fix is applicable to things outside of fonts
 
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The new preferred location is in <code>$XDG_DATA_HOME/fonts</code>, which for most users will resolve to <code>~/.local/share/fonts</code></translate><ref>https://lists.freedesktop.org/archives/fontconfig/2014-July/005270.html</ref>
The new preferred location is in <code>$XDG_DATA_HOME/fonts</code>, which for most users will resolve to <code>~/.local/share/fonts</code></translate><ref>https://lists.freedesktop.org/archives/fontconfig/2014-July/005270.html</ref>


<translate>=== Flatpak applications can't find system fonts === <!--T:49--></translate>
<translate>
=== Flatpak applications can't find system fonts ===
See: [[Fixes for non-Nix applications#Flatpak, Distrobox, Appimage and other non-Nix applications can't find system fonts/icons/themes]]


<translate><!--T:50--> To expose available fonts under <code>/run/current-system/sw/share/X11/fonts</code>, enable <code>fontDir</code> in your NixOS configuration.</translate>
==== Alternative fixes for Flatpak apps ====
This section documents alternative fixes for Flatpak apps.
Note that font cache inside flatpak container may not be recreated after changes to fonts in <code>/usr/share/fonts</code>, because font cache seem to be relying on file timestamps that are missing in <code>/nix/store</code>.


{{File|3=fonts.fontDir.enable = true;|name=/etc/nixos/configuration.nix|lang=nix}}
You can make sure that font directory is bind-mounted properly inside flatpak container by running<code>flatpak enter <instance> findmnt  | grep /run/host/fonts</code> or by running <code>flatpak enter <instance> ls -alh /run/host/fonts</code> and compare it to <code>ls -alh /usr/share/fonts</code>.
If everything is mounted properly, but you still do not see fonts in flatpak app - force font cache recreation inside flatpak container:
<code>flatpak run --command=fc-cache <application id> -f -v</code>


<translate><!--T:51--> You will then need to link/copy this folder to one of the Flatpak-supported locations - see below.</translate>
===== Solution 1: Copy fonts to <code>$HOME/.local/share/fonts</code> =====<!--T:52-->
 
</translate>
<translate>==== Solution 1: Copy fonts to <code>$HOME/.local/share/fonts</code> ==== <!--T:52--></translate>
<translate><!--T:53-->
<translate><!--T:53-->
Create fonts directory <code>$HOME/.local/share/fonts</code> and copy system fonts with option <code>-L, --dereference</code>. You will need to repeat this step whenever the fonts change.<syntaxhighlight lang="console">
Create fonts directory <code>$HOME/.local/share/fonts</code> and copy system fonts with option <code>-L, --dereference</code>. You will need to repeat this step whenever the fonts change.<syntaxhighlight lang="console">
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</translate>
</translate>


<translate>==== Solution 2: Symlink to system fonts at  <code>$HOME/.local/share/fonts</code> ==== <!--T:58--></translate>
<translate>
===== Solution 2: Symlink to system fonts at  <code>$HOME/.local/share/fonts</code> =====<!--T:58-->
</translate>
<translate><!--T:59--> <blockquote>'''Note:''' this method doesn't work for some flatpak applications (for example, steam)! </translate>
<translate><!--T:59--> <blockquote>'''Note:''' this method doesn't work for some flatpak applications (for example, steam)! </translate>


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<translate>
<translate>
===== Option 1: Allow access to the fonts folder and <code>/nix/store</code> ===== <!--T:61-->
====== Option 1: Allow access to the fonts folder and <code>/nix/store</code> ======<!--T:61-->
</translate>
</translate>
<translate>
<translate>
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</syntaxhighlight>
</syntaxhighlight>


<translate>===== Option 2: Allow access to the WHOLE filesystem ===== <!--T:64--></translate>
<translate>
====== Option 2: Allow access to the WHOLE filesystem ======<!--T:64-->
</translate>
<translate>
<translate>
<!--T:65-->
<!--T:65-->
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<!--T:66-->
<!--T:66-->
It is important to keep in mind that some flatpak apps may refuse to launch if given certain permissions, such as the Steam flatpak.  
It is important to keep in mind that some flatpak apps may refuse to launch if given certain permissions, such as the Steam flatpak.  
</translate>
<translate>==== Solution 3: Configure bindfs for fonts/cursors/icons support ==== <!--T:67--></translate>
<translate><!--T:68-->
Alternatively, you can expose relevant packages directly under <code>/usr/share/...</code> paths. This will also enable Flatpak to use a custom cursor theme if you have one. This solution doesn't require <code>fonts.fontDir.enable</code> to be enabled.<syntaxhighlight lang="nix">
system.fsPackages = [ pkgs.bindfs ];
fileSystems = let
  mkRoSymBind = path: {
    device = path;
    fsType = "fuse.bindfs";
    options = [ "ro" "resolve-symlinks" "x-gvfs-hide" ];
  };
  fontsPkgs = config.fonts.packages ++ (with pkgs; [
      # Add your cursor themes and icon packages here
      bibata-cursors
      gnome-themes-extra
      # etc.
    ]);
  x11Fonts = pkgs.runCommand "X11-fonts"
    {
      preferLocalBuild = true;
      nativeBuildInputs = with pkgs; [
        gzip
        mkfontdir
      ];
    }
    (''
      mkdir -p "$out/share/fonts"
      font_regexp='.*\.\(ttf\|ttc\|otb\|otf\|pcf\|pfa\|pfb\|bdf\)\(\.gz\)?'
    ''
    + (builtins.concatStringsSep "\n" (builtins.map (pkg: ''
        find ${toString pkg} -regex "$font_regexp" \
          -exec ln -sf -t "$out/share/fonts" '{}' \;
      '') fontsPkgs
      ))
    + ''
      cd "$out/share/fonts"
      mkfontscale
      mkfontdir
      cat $(find ${pkgs.font-alias}/ -name fonts.alias) >fonts.alias
    '');
  aggregatedIcons = pkgs.buildEnv {
    name = "system-icons";
    paths = fontsPkgs;
    pathsToLink = [
      "/share/icons"
    ];
  };
in {
  "/usr/share/icons" = mkRoSymBind (aggregatedIcons + "/share/icons");
  "/usr/share/fonts" = mkRoSymBind (x11Fonts + "/share/fonts");
};
<!--T:69-->
nts.packages = with pkgs; [
  noto-fonts
  noto-fonts-color-emoji
  noto-fonts-cjk-sans
];
</syntaxhighlight>Note that font cache inside flatpak container may not be recreated after changes to fonts in <code>/usr/share/fonts</code>, because font cache seem to be relying on file timestamps that are missing in <code>/nix/store</code>.
</translate>
<translate>
<!--T:70-->
You can make sure that font directory is bind-mounted properly inside flatpak container by running <code>flatpak enter <instance> findmnt  | grep /run/host/fonts</code>, or by running <code>flatpak enter <instance> ls -alh /run/host/fonts</code> and compare it to <code>ls -alh /usr/share/fonts</code>.
</translate>
<translate>
<!--T:71-->
If everything is mounted properly, but you still do not see fonts in flatpak app - force font cache recreation inside flatpak container: <code>flatpak run --command=fc-cache <application id> -f -v</code>
</translate>
</translate>


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