nixpkgs/modules/services/x11/display-managers/default.nix
Eelco Dolstra 6596a3ec55 * When using kdm, always use our xsession script, even when the
default session is selected.  This is because we always want to run
  our own initialisation (like starting ssh-agent).

* ssh-agent: don't start it is a child but have it re-exec the
  xsession script.  This ensures that ssh-agent quits when we log out.

* In the xsession script, don't redirect output to ~/.xsession-errors
  if the display manager is kdm, since kdm already does that.  In fact
  it uses ~/.xsession-errors<optional number> if there are concurrent
  X sessions.

* For consistency with other distros and the xdm manpage, exec the
  ~/.xsession script instead of sourcing it.  Do this for the "custom"
  session type provided by kdm.

svn path=/nixos/trunk/; revision=17087
2009-09-13 13:34:52 +00:00

211 lines
6.3 KiB
Nix

# 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
# Handle being called by kdm.
if test "''${1:0:1}" = /; then eval exec "$1"; fi
# The first argument of this script is the session type.
sessionType="$1"
if test "$sessionType" = default; then sessionType=""; fi
${optionalString (!cfg.displayManager.job.logsXsession) ''
exec > ~/.xsession-errors 2>&1
''}
${optionalString cfg.startSSHAgent ''
if test -z "$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
''}
# Load X defaults.
if test -e ~/.Xdefaults; then
${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
fi
source /etc/profile
# Allow the user to setup a custom session type.
if test "$sessionType" = custom; then
test -x ~/.xsession && exec ~/.xsession
sessionType="" # fall-thru if there is no ~/.xsession
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 = concatMap (d: map (w: d.name + " + " + w.name) wm) dm;
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>.
'';
};
};
};
};
};
}