144 lines
4 KiB
Nix
144 lines
4 KiB
Nix
{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) stdenv;
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kernelPackages = config.boot.kernelPackages;
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splashutils = kernelPackages.splashutils;
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requiredTTYs = config.requiredTTYs;
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backgrounds =
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let
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specificThemes = config.services.ttyBackgrounds.specificThemes;
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overridenTTYs = map (x: x.tty) specificThemes;
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# Use the default theme for all the mingetty ttys and for the
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# syslog tty, except those for which a specific theme is
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# specified.
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defaultTTYs =
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filter (x: !(elem x overridenTTYs)) requiredTTYs;
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in
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(map (tty: {
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inherit tty;
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theme = config.services.ttyBackgrounds.defaultTheme;
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}) defaultTTYs)
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++ specificThemes;
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themesUnpacked = stdenv.mkDerivation {
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name = "splash-themes";
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builder = ./tty-backgrounds-combine.sh;
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# !!! Should use XML here.
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ttys = map (x: x.tty) backgrounds;
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themes = map (x: if x ? theme then (unpackTheme x.theme) else "default") backgrounds;
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};
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unpackTheme = theme: import ../../lib/unpack-theme.nix {
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inherit stdenv theme;
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};
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in
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{
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###### interface
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options = {
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services.ttyBackgrounds = {
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enable = mkOption {
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default = true;
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description = ''
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Whether to enable graphical backgrounds for the virtual consoles.
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'';
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};
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defaultTheme = mkOption {
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default = pkgs.fetchurl {
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#url = http://www.bootsplash.de/files/themes/Theme-BabyTux.tar.bz2;
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url = mirror://gentoo/distfiles/Theme-BabyTux.tar.bz2;
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md5 = "a6d89d1c1cff3b6a08e2f526f2eab4e0";
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};
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description = ''
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The default theme for the virtual consoles. Themes can be found
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at <link xlink:href='http://www.bootsplash.de/' />.
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'';
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};
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specificThemes = mkOption {
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default = [ ];
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description = ''
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This option overrides the theme for specific virtual consoles.
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.services.ttyBackgrounds.enable {
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assertions = singleton
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{ assertion = kernelPackages.splashutils != null;
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message = "kernelPackages.splashutils may not be false";
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};
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services.ttyBackgrounds.specificThemes = singleton
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{ tty = config.services.syslogd.tty;
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theme = pkgs.themes "theme-gnu";
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};
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environment.etc = singleton
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{ source = themesUnpacked;
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target = "splash";
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};
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jobs.ttyBackgrounds =
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{ name = "tty-backgrounds";
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startOn = "started udev";
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preStart =
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''
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# Critical: tell the kernel where to find splash_helper. It calls
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# this program every time we switch between consoles.
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helperProcFile=${splashutils.helperProcFile}
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if test -e /proc/sys/fbcondecor; then helperProcFile=/proc/sys/fbcondecor; fi
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echo ${splashutils}/${splashutils.helperName} > $helperProcFile
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# For each console...
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for tty in ${toString (map (x: x.tty) backgrounds)}; do
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# Make sure that the console exists.
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echo -n "" > /dev/$tty
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# Set the theme as determined by tty-backgrounds-combine.sh
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# above. Note that splashutils needs a TTY number
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# instead of a device name, hence the ''${tty:3}.
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theme=$(readlink ${themesUnpacked}/$tty)
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${splashutils}/${splashutils.controlName} --tty ''${tty:3} -c setcfg -t $theme || true
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${splashutils}/${splashutils.controlName} --tty ''${tty:3} -c setpic -t $theme || true
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${splashutils}/${splashutils.controlName} --tty ''${tty:3} -c on || true
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done
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'';
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postStop =
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''
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# Disable the theme on each console.
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for tty in ${toString (map (x: x.tty) backgrounds)}; do
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${splashutils}/${splashutils.controlName} --tty ''${tty:3} -c off || true
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done
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'';
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};
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};
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}
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