nixpkgs/modules/tasks/tty-backgrounds.nix
Eelco Dolstra bb292fdf04 * Support post-stop actions.
svn path=/nixos/branches/modular-nixos/; revision=16393
2009-07-16 13:46:49 +00:00

164 lines
4.5 KiB
Nix

{pkgs, config, ...}:
let
inherit (pkgs.lib) mkOption mkIf singleton;
inherit (pkgs) stdenv;
kernelPackages = config.boot.kernelPackages;
splashutils = kernelPackages.splashutils;
requiredTTYs = config.requiredTTYs;
backgrounds =
let
specificThemes =
config.services.ttyBackgrounds.defaultSpecificThemes
++ config.services.ttyBackgrounds.specificThemes;
overridenTTYs = map (x: x.tty) specificThemes;
# Use the default theme for all the mingetty ttys and for the
# syslog tty, except those for which a specific theme is
# specified.
defaultTTYs =
pkgs.lib.filter (x: !(pkgs.lib.elem x overridenTTYs)) requiredTTYs;
in
(map (ttyNumber: {
tty = ttyNumber;
theme = config.services.ttyBackgrounds.defaultTheme;
}) defaultTTYs)
++ specificThemes;
themesUnpacked = stdenv.mkDerivation {
name = "splash-themes";
builder = ./tty-backgrounds-combine.sh;
# !!! Should use XML here.
ttys = map (x: x.tty) backgrounds;
themes = map (x: if x ? theme then (unpackTheme x.theme) else "default") backgrounds;
};
unpackTheme = theme: import ../../lib/unpack-theme.nix {
inherit stdenv theme;
};
in
{
###### interface
options = {
services.ttyBackgrounds = {
enable = mkOption {
default = true;
description = ''
Whether to enable graphical backgrounds for the virtual consoles.
'';
};
defaultTheme = mkOption {
default = pkgs.fetchurl {
#url = http://www.bootsplash.de/files/themes/Theme-BabyTux.tar.bz2;
url = mirror://gentoo/distfiles/Theme-BabyTux.tar.bz2;
md5 = "a6d89d1c1cff3b6a08e2f526f2eab4e0";
};
description = ''
The default theme for the virtual consoles. Themes can be found
at <link xlink:href='http://www.bootsplash.de/' />.
'';
};
defaultSpecificThemes = mkOption {
default = [
/*
{ tty = 6;
theme = pkgs.fetchurl { # Yeah!
url = mirror://gentoo/distfiles/Theme-Pativo.tar.bz2;
md5 = "9e13beaaadf88d43a5293e7ab757d569";
};
}
*/
{ tty = 10;
theme = pkgs.themes "theme-gnu";
}
];
description = ''
This option sets specific themes for virtual consoles. If you
just want to set themes for additional consoles, use
<option>services.ttyBackgrounds.specificThemes</option>.
'';
};
specificThemes = mkOption {
default = [
];
description = ''
This option allows you to set specific themes for virtual
consoles.
'';
};
};
};
###### implementation
config = mkIf config.services.ttyBackgrounds.enable {
assertions = singleton
{ assertion = kernelPackages.splashutils != null;
message = "kernelPackages.splashutils may not be false";
};
environment.etc = singleton
{ source = themesUnpacked;
target = "splash";
};
jobs = singleton {
name = "tty-backgrounds";
startOn = "udev";
preStart =
''
# Critical: tell the kernel where to find splash_helper. It calls
# this program every time we switch between consoles.
helperProcFile=${splashutils.helperProcFile}
if test -e /proc/sys/fbcondecor; then helperProcFile=/proc/sys/fbcondecor; fi
echo ${splashutils}/${splashutils.helperName} > $helperProcFile
# For each console...
for tty in ${toString (map (x: x.tty) backgrounds)}; do
# Make sure that the console exists.
echo -n "" > /dev/tty$tty
# Set the theme as determined by tty-backgrounds-combine.sh
# above.
theme=$(readlink ${themesUnpacked}/$tty)
${splashutils}/${splashutils.controlName} --tty $tty -c setcfg -t $theme || true
${splashutils}/${splashutils.controlName} --tty $tty -c setpic -t $theme || true
${splashutils}/${splashutils.controlName} --tty $tty -c on || true
done
'';
postStop =
''
/var/run/current-system/sw/bin/ps -axuw > /tmp/ps
# Disable the theme on each console.
for tty in ${toString (map (x: x.tty) backgrounds)}; do
${splashutils}/${splashutils.controlName} --tty $tty -c off || true
done
'';
};
};
}