nixpkgs/nixos/modules/services/x11/desktop-managers/default.nix
Michael Weiss 852813689a desktop-managers: Use a black BG as fallback
Use a solid black background when no background image (via
~/.background-image) is provided. In my case this fixes the really
strange behaviour when i3 without a desktop manager starts with the SDDM
login screen as background image.
2017-04-29 19:03:30 +02:00

89 lines
2.6 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
xcfg = config.services.xserver;
cfg = xcfg.desktopManager;
# If desktop manager `d' isn't capable of setting a background and
# the xserver is enabled, `feh' or `xsetroot' are used as a fallback.
needBGCond = d: ! (d ? bgSupport && d.bgSupport) && xcfg.enable;
in
{
# Note: the order in which desktop manager modules are imported here
# determines the default: later modules (if enabled) are preferred.
# E.g., if Plasma 5 is enabled, it supersedes xterm.
imports = [
./none.nix ./xterm.nix ./xfce.nix ./plasma5.nix ./lumina.nix
./lxqt.nix ./enlightenment.nix ./gnome3.nix ./kodi.nix
];
options = {
services.xserver.desktopManager = {
session = mkOption {
internal = true;
default = [];
example = singleton
{ name = "kde";
bgSupport = true;
start = "...";
};
description = ''
Internal option used to add some common line to desktop manager
scripts before forwarding the value to the
<varname>displayManager</varname>.
'';
apply = list: {
list = map (d: d // {
manage = "desktop";
start = d.start
+ optionalString (needBGCond d) ''
if [ -e $HOME/.background-image ]; then
${pkgs.feh}/bin/feh --bg-scale $HOME/.background-image
else
# Use a solid black background as fallback
${pkgs.xorg.xsetroot}/bin/xsetroot -solid black
fi
'';
}) list;
needBGPackages = [] != filter needBGCond list;
};
};
default = mkOption {
type = types.str;
default = "";
example = "none";
description = "Default desktop manager loaded if none have been chosen.";
apply = defaultDM:
if defaultDM == "" && cfg.session.list != [] then
(head cfg.session.list).name
else if any (w: w.name == defaultDM) cfg.session.list then
defaultDM
else
throw ''
Default desktop manager (${defaultDM}) not found.
Probably you want to change
services.xserver.desktopManager.default = "${defaultDM}";
to one of
${concatMapStringsSep "\n " (w: "services.xserver.desktopManager.default = \"${w.name}\";") cfg.session.list}
'';
};
};
};
config = {
services.xserver.displayManager.session = cfg.session.list;
environment.systemPackages =
mkIf cfg.session.needBGPackages [ pkgs.feh ]; # xsetroot via xserver.enable
};
}