nix-home/modules/personal/fonts/mounting.nix

{ pkgs, config, lib, ... }:
lib.mkIf pkgs.stdenv.isLinux {
  system.fsPackages = [ pkgs.bindfs ];
  fileSystems =
    let
      mkRoSymBind = path: {
        device = path;
        fsType = "fuse.bindfs";
        options = [ "ro" "resolve-symlinks" "x-gvfs-hide" ];
      };
      aggregatedIcons = pkgs.buildEnv {
        name = "system-icons";
        paths = with pkgs; [
          #libsForQt5.breeze-qt5  # for plasma
          gnome.gnome-themes-extra
        ];
        pathsToLink = [ "/share/icons" ];
      };
      aggregatedFonts = pkgs.buildEnv {
        name = "system-fonts";
        paths = config.fonts.packages;
        pathsToLink = [ "/share/fonts" ];
      };
    in
    {
      "/usr/share/icons" = mkRoSymBind "${aggregatedIcons}/share/icons";
      "/usr/local/share/fonts" = mkRoSymBind "${aggregatedFonts}/share/fonts";
    };
}