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|
# This module declares the options to define a *display manager*, the
# program responsible for handling X logins (such as xdm, kdm, gdb, or
# SLiM). The display manager allows the user to select a *session
# type*. When the user logs in, the display manager starts the
# *session script* ("xsession" below) to launch the selected session
# type. The session type defines two things: the *desktop manager*
# (e.g., KDE, Gnome or a plain xterm), and optionally the *window
# manager* (e.g. kwin or twm).
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.xserver;
xorg = pkgs.xorg;
# file provided by services.xserver.displayManager.session.script
xsession = wm: dm: pkgs.writeScript "xsession"
''
#! /bin/sh
cd "$HOME"
# The first argument of this script is the session type.
sessionType="$1"
if [ "$sessionType" = default ]; then sessionType=""; fi
${optionalString (!cfg.displayManager.job.logsXsession) ''
exec > ~/.xsession-errors 2>&1
''}
${optionalString cfg.startOpenSSHAgent ''
if test -z "$SSH_AUTH_SOCK"; then
# Restart this script as a child of the SSH agent. (It is
# also possible to start the agent as a child that prints
# the required environment variabled on stdout, but in
# that mode ssh-agent is not terminated when we log out.)
export SSH_ASKPASS=${pkgs.x11_ssh_askpass}/libexec/x11-ssh-askpass
exec ${pkgs.openssh}/bin/ssh-agent "$0" "$sessionType"
fi
''}
${optionalString cfg.startGnuPGAgent ''
if test -z "$SSH_AUTH_SOCK"; then
# Restart this script as a child of the GnuPG agent.
exec "${pkgs.gnupg}/bin/gpg-agent" \
--enable-ssh-support --daemon \
--pinentry-program "${pkgs.pinentry}/bin/pinentry-gtk-2" \
--write-env-file "$HOME/.gpg-agent-info" \
"$0" "$sessionType"
fi
''}
# Start a ConsoleKit session so that we get ownership of various
# devices.
if test -z "$XDG_SESSION_COOKIE"; then
exec ${pkgs.consolekit}/bin/ck-launch-session "$0" "$sessionType"
fi
# Handle being called by kdm.
if test "''${1:0:1}" = /; then eval exec "$1"; fi
# Start PulseAudio if enabled.
${optionalString config.hardware.pulseaudio.enable ''
${pkgs.pulseaudio}/bin/pulseaudio --start
# Publish access credentials in the root window.
${pkgs.pulseaudio}/bin/pactl load-module module-x11-publish "display=$DISPLAY"
# Keep track of devices. Mostly useful for Phonon/KDE.
${pkgs.pulseaudio}/bin/pactl load-module module-device-manager "do_routing=1"
''}
# Load X defaults.
if test -e ~/.Xdefaults; then
${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
fi
source /etc/profile
# Allow the user to setup a custom session type.
if test -x ~/.xsession; then
exec ~/.xsession
else
if test "$sessionType" = "custom"; then
sessionType="" # fall-thru if there is no ~/.xsession
fi
fi
# The session type is "<desktop-manager> + <window-manager>", so
# extract those.
windowManager="''${sessionType##* + }"
: ''${windowManager:=${cfg.windowManager.default}}
desktopManager="''${sessionType% + *}"
: ''${desktopManager:=${cfg.desktopManager.default}}
# Start the window manager.
case $windowManager in
${concatMapStrings (s: ''
(${s.name})
${s.start}
;;
'') wm}
(*) echo "$0: Window manager '$windowManager' not found.";;
esac
# Start the desktop manager.
case $desktopManager in
${concatMapStrings (s: ''
(${s.name})
${s.start}
;;
'') dm}
(*) echo "$0: Desktop manager '$desktopManager' not found.";;
esac
test -n "$waitPID" && wait "$waitPID"
exit 0
'';
mkDesktops = names: pkgs.runCommand "desktops" {}
''
ensureDir $out
${concatMapStrings (n: ''
cat - > "$out/${n}.desktop" << EODESKTOP
[Desktop Entry]
Version=1.0
Type=XSession
TryExec=${cfg.displayManager.session.script}
Exec=${cfg.displayManager.session.script} '${n}'
Name=${n}
Comment=
EODESKTOP
'') names}
'';
in
{
imports = [ ./kdm.nix ./slim.nix ];
options = {
services.xserver.displayManager = {
xauthBin = mkOption {
default = "${xorg.xauth}/bin/xauth";
description = "Path to the <command>xauth</command> program used by display managers.";
};
xserverBin = mkOption {
default = "${xorg.xorgserver}/bin/X";
description = "Path to the X server used by display managers.";
};
xserverArgs = mkOption {
default = [];
example = [ "-ac" "-logverbose" "-nolisten tcp" ];
description = "List of arguments for the X server.";
apply = toString;
};
session = mkOption {
default = [];
example = [
{
manage = "desktop";
name = "xterm";
start = "
${pkgs.xterm}/bin/xterm -ls &
waitPID=$!
";
}
];
description = ''
List of sessions supported with the command used to start each
session. Each session script can set the
<varname>waitPID</varname> shell variable to make this script
wait until the end of the user session. Each script is used
to define either a windows manager or a desktop manager. These
can be differentiated by setting the attribute
<varname>manage</varname> either to <literal>"window"</literal>
or <literal>"desktop"</literal>.
The list of desktop manager and window manager should appear
inside the display manager with the desktop manager name
followed by the window manager name.
'';
apply = list: rec {
wm = filter (s: s.manage == "window") list;
dm = filter (s: s.manage == "desktop") list;
names = flip concatMap dm
(d: map (w: d.name + optionalString (w.name != "none") (" + " + w.name))
(filter (w: d.name != "none" || w.name != "none") wm));
desktops = mkDesktops names;
script = xsession wm dm;
};
};
job = mkOption {
default = {};
type = types.uniq types.optionSet;
description = "This option defines how to start the display manager.";
options = {
preStart = mkOption {
default = "";
example = "rm -f /var/log/my-display-manager.log";
description = "Script executed before the display manager is started.";
};
execCmd = mkOption {
example = "${pkgs.slim}/bin/slim";
description = "Command to start the display manager.";
};
environment = mkOption {
default = {};
example = { SLIM_CFGFILE = /etc/slim.conf; };
description = "Additional environment variables needed by the display manager.";
};
logsXsession = mkOption {
default = false;
description = ''
Whether the display manager redirects the
output of the session script to
<filename>~/.xsession-errors</filename>.
'';
};
};
};
};
};
}
|