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|
# This module declares the options to define a *display manager*, the
# program responsible for handling X logins (such as LightDM, GDM, or SDDM).
# 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, lib, pkgs, ... }:
with lib;
let
cfg = config.services.xserver;
xorg = pkgs.xorg;
fontconfig = config.fonts.fontconfig;
xresourcesXft = pkgs.writeText "Xresources-Xft" ''
Xft.antialias: ${if fontconfig.antialias then "1" else "0"}
Xft.rgba: ${fontconfig.subpixel.rgba}
Xft.lcdfilter: lcd${fontconfig.subpixel.lcdfilter}
Xft.hinting: ${if fontconfig.hinting.enable then "1" else "0"}
Xft.autohint: ${if fontconfig.hinting.autohint then "1" else "0"}
Xft.hintstyle: hintslight
'';
# file provided by services.xserver.displayManager.sessionData.wrapper
xsessionWrapper = pkgs.writeScript "xsession-wrapper"
''
#! ${pkgs.bash}/bin/bash
# Shared environment setup for graphical sessions.
. /etc/profile
cd "$HOME"
# Allow the user to execute commands at the beginning of the X session.
if test -f ~/.xprofile; then
source ~/.xprofile
fi
${optionalString cfg.displayManager.job.logToJournal ''
if [ -z "$_DID_SYSTEMD_CAT" ]; then
export _DID_SYSTEMD_CAT=1
exec ${config.systemd.package}/bin/systemd-cat -t xsession "$0" "$@"
fi
''}
${optionalString cfg.displayManager.job.logToFile ''
exec &> >(tee ~/.xsession-errors)
''}
# Load X defaults. This should probably be safe on wayland too.
${xorg.xrdb}/bin/xrdb -merge ${xresourcesXft}
if test -e ~/.Xresources; then
${xorg.xrdb}/bin/xrdb -merge ~/.Xresources
elif test -e ~/.Xdefaults; then
${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
fi
# Import environment variables into the systemd user environment.
${optionalString (cfg.displayManager.importedVariables != []) (
"/run/current-system/systemd/bin/systemctl --user import-environment "
+ toString (unique cfg.displayManager.importedVariables)
)}
# Speed up application start by 50-150ms according to
# http://kdemonkey.blogspot.nl/2008/04/magic-trick.html
compose_cache="''${XCOMPOSECACHE:-$HOME/.compose-cache}"
mkdir -p "$compose_cache"
# To avoid accidentally deleting a wrongly set up XCOMPOSECACHE directory,
# defensively try to delete cache *files* only, following the file format specified in
# https://gitlab.freedesktop.org/xorg/lib/libx11/-/blob/master/modules/im/ximcp/imLcIm.c#L353-358
# sprintf (*res, "%s/%c%d_%03x_%08x_%08x", dir, _XimGetMyEndian(), XIM_CACHE_VERSION, (unsigned int)sizeof (DefTree), hash, hash2);
${pkgs.findutils}/bin/find "$compose_cache" -maxdepth 1 -regextype posix-extended -regex '.*/[Bl][0-9]+_[0-9a-f]{3}_[0-9a-f]{8}_[0-9a-f]{8}' -delete
unset compose_cache
# Work around KDE errors when a user first logs in and
# .local/share doesn't exist yet.
mkdir -p "''${XDG_DATA_HOME:-$HOME/.local/share}"
unset _DID_SYSTEMD_CAT
${cfg.displayManager.sessionCommands}
# Start systemd user services for graphical sessions
/run/current-system/systemd/bin/systemctl --user start graphical-session.target
# Allow the user to setup a custom session type.
if test -x ~/.xsession; then
eval exec ~/.xsession "$@"
fi
if test "$1"; then
# Run the supplied session command. Remove any double quotes with eval.
eval exec "$@"
else
# TODO: Do we need this? Should not the session always exist?
echo "error: unknown session $1" 1>&2
exit 1
fi
'';
installedSessions = pkgs.runCommand "desktops"
{ # trivial derivation
preferLocalBuild = true;
allowSubstitutes = false;
}
''
mkdir -p "$out/share/"{xsessions,wayland-sessions}
${concatMapStrings (pkg: ''
for n in ${concatStringsSep " " pkg.providedSessions}; do
if ! test -f ${pkg}/share/wayland-sessions/$n.desktop -o \
-f ${pkg}/share/xsessions/$n.desktop; then
echo "Couldn't find provided session name, $n.desktop, in session package ${pkg.name}:"
echo " ${pkg}"
return 1
fi
done
if test -d ${pkg}/share/xsessions; then
${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions
fi
if test -d ${pkg}/share/wayland-sessions; then
${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions
fi
'') cfg.displayManager.sessionPackages}
'';
dmDefault = cfg.desktopManager.default;
# fallback default for cases when only default wm is set
dmFallbackDefault = if dmDefault != null then dmDefault else "none";
wmDefault = cfg.windowManager.default;
defaultSessionFromLegacyOptions = dmFallbackDefault + optionalString (wmDefault != null && wmDefault != "none") "+${wmDefault}";
in
{
options = {
services.xserver.displayManager = {
xauthBin = mkOption {
internal = true;
default = "${xorg.xauth}/bin/xauth";
description = "Path to the <command>xauth</command> program used by display managers.";
};
xserverBin = mkOption {
type = types.path;
description = "Path to the X server used by display managers.";
};
xserverArgs = mkOption {
type = types.listOf types.str;
default = [];
example = [ "-ac" "-logverbose" "-verbose" "-nolisten tcp" ];
description = "List of arguments for the X server.";
};
setupCommands = mkOption {
type = types.lines;
default = "";
description = ''
Shell commands executed just after the X server has started.
This option is only effective for display managers for which this feature
is supported; currently these are LightDM, GDM and SDDM.
'';
};
sessionCommands = mkOption {
type = types.lines;
default = "";
example =
''
xmessage "Hello World!" &
'';
description = ''
Shell commands executed just before the window or desktop manager is
started. These commands are not currently sourced for Wayland sessions.
'';
};
hiddenUsers = mkOption {
type = types.listOf types.str;
default = [ "nobody" ];
description = ''
A list of users which will not be shown in the display manager.
'';
};
sessionPackages = mkOption {
type = with types; listOf (package // {
description = "package with provided sessions";
check = p: assertMsg
(package.check p && p ? providedSessions
&& p.providedSessions != [] && all isString p.providedSessions)
''
Package, '${p.name}', did not specify any session names, as strings, in
'passthru.providedSessions'. This is required when used as a session package.
The session names can be looked up in:
${p}/share/xsessions
${p}/share/wayland-sessions
'';
});
default = [];
description = ''
A list of packages containing x11 or wayland session files to be passed to the display manager.
'';
};
session = mkOption {
default = [];
example = literalExpression
''
[ { manage = "desktop";
name = "xterm";
start = '''
''${pkgs.xterm}/bin/xterm -ls &
waitPID=$!
''';
}
]
'';
description = ''
List of sessions supported with the command used to start each
session. Each session script can set the
<varname>waitPID</varname> shell variable to make this script
wait until the end of the user session. Each script is used
to define either a window manager or a desktop manager. These
can be differentiated by setting the attribute
<varname>manage</varname> either to <literal>"window"</literal>
or <literal>"desktop"</literal>.
The list of desktop manager and window manager should appear
inside the display manager with the desktop manager name
followed by the window manager name.
'';
};
sessionData = mkOption {
description = "Data exported for display managers’ convenience";
internal = true;
default = {};
apply = val: {
wrapper = xsessionWrapper;
desktops = installedSessions;
sessionNames = concatMap (p: p.providedSessions) cfg.displayManager.sessionPackages;
# We do not want to force users to set defaultSession when they have only single DE.
autologinSession =
if cfg.displayManager.defaultSession != null then
cfg.displayManager.defaultSession
else if cfg.displayManager.sessionData.sessionNames != [] then
head cfg.displayManager.sessionData.sessionNames
else
null;
};
};
defaultSession = mkOption {
type = with types; nullOr str // {
description = "session name";
check = d:
assertMsg (d != null -> (str.check d && elem d cfg.displayManager.sessionData.sessionNames)) ''
Default graphical session, '${d}', not found.
Valid names for 'services.xserver.displayManager.defaultSession' are:
${concatStringsSep "\n " cfg.displayManager.sessionData.sessionNames}
'';
};
default =
if dmDefault != null || wmDefault != null then
defaultSessionFromLegacyOptions
else
null;
example = "gnome";
description = ''
Graphical session to pre-select in the session chooser (only effective for GDM, LightDM and SDDM).
On GDM, LightDM and SDDM, it will also be used as a session for auto-login.
'';
};
importedVariables = mkOption {
type = types.listOf (types.strMatching "[a-zA-Z_][a-zA-Z0-9_]*");
visible = false;
description = ''
Environment variables to import into the systemd user environment.
'';
};
job = {
preStart = mkOption {
type = types.lines;
default = "";
example = "rm -f /var/log/my-display-manager.log";
description = "Script executed before the display manager is started.";
};
execCmd = mkOption {
type = types.str;
example = literalExpression ''"''${pkgs.lightdm}/bin/lightdm"'';
description = "Command to start the display manager.";
};
environment = mkOption {
type = types.attrsOf types.unspecified;
default = {};
description = "Additional environment variables needed by the display manager.";
};
logToFile = mkOption {
type = types.bool;
default = false;
description = ''
Whether the display manager redirects the output of the
session script to <filename>~/.xsession-errors</filename>.
'';
};
logToJournal = mkOption {
type = types.bool;
default = true;
description = ''
Whether the display manager redirects the output of the
session script to the systemd journal.
'';
};
};
# Configuration for automatic login. Common for all DM.
autoLogin = mkOption {
type = types.submodule {
options = {
enable = mkOption {
type = types.bool;
default = cfg.displayManager.autoLogin.user != null;
description = ''
Automatically log in as <option>autoLogin.user</option>.
'';
};
user = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
User to be used for the automatic login.
'';
};
};
};
default = {};
description = ''
Auto login configuration attrset.
'';
};
};
};
config = {
assertions = [
{ assertion = cfg.displayManager.autoLogin.enable -> cfg.displayManager.autoLogin.user != null;
message = ''
services.xserver.displayManager.autoLogin.enable requires services.xserver.displayManager.autoLogin.user to be set
'';
}
{
assertion = cfg.desktopManager.default != null || cfg.windowManager.default != null -> cfg.displayManager.defaultSession == defaultSessionFromLegacyOptions;
message = "You cannot use both services.xserver.displayManager.defaultSession option and legacy options (services.xserver.desktopManager.default and services.xserver.windowManager.default).";
}
];
warnings =
mkIf (dmDefault != null || wmDefault != null) [
''
The following options are deprecated:
${concatStringsSep "\n " (map ({c, t}: t) (filter ({c, t}: c != null) [
{ c = dmDefault; t = "- services.xserver.desktopManager.default"; }
{ c = wmDefault; t = "- services.xserver.windowManager.default"; }
]))}
Please use
services.xserver.displayManager.defaultSession = "${defaultSessionFromLegacyOptions}";
instead.
''
];
services.xserver.displayManager.xserverBin = "${xorg.xorgserver.out}/bin/X";
services.xserver.displayManager.importedVariables = [
# This is required by user units using the session bus.
"DBUS_SESSION_BUS_ADDRESS"
# These are needed by the ssh-agent unit.
"DISPLAY"
"XAUTHORITY"
# This is required to specify session within user units (e.g. loginctl lock-session).
"XDG_SESSION_ID"
];
systemd.user.targets.graphical-session = {
unitConfig = {
RefuseManualStart = false;
StopWhenUnneeded = false;
};
};
# Create desktop files and scripts for starting sessions for WMs/DMs
# that do not have upstream session files (those defined using services.{display,desktop,window}Manager.session options).
services.xserver.displayManager.sessionPackages =
let
dms = filter (s: s.manage == "desktop") cfg.displayManager.session;
wms = filter (s: s.manage == "window") cfg.displayManager.session;
# Script responsible for starting the window manager and the desktop manager.
xsession = dm: wm: pkgs.writeScript "xsession" ''
#! ${pkgs.bash}/bin/bash
# Legacy session script used to construct .desktop files from
# `services.xserver.displayManager.session` entries. Called from
# `sessionWrapper`.
# Start the window manager.
${wm.start}
# Start the desktop manager.
${dm.start}
${optionalString cfg.updateDbusEnvironment ''
${lib.getBin pkgs.dbus}/bin/dbus-update-activation-environment --systemd --all
''}
test -n "$waitPID" && wait "$waitPID"
/run/current-system/systemd/bin/systemctl --user stop graphical-session.target
exit 0
'';
in
# We will generate every possible pair of WM and DM.
concatLists (
builtins.map
({dm, wm}: let
sessionName = "${dm.name}${optionalString (wm.name != "none") ("+" + wm.name)}";
script = xsession dm wm;
desktopNames = if dm ? desktopNames
then concatStringsSep ";" dm.desktopNames
else sessionName;
in
optional (dm.name != "none" || wm.name != "none")
(pkgs.writeTextFile {
name = "${sessionName}-xsession";
destination = "/share/xsessions/${sessionName}.desktop";
# Desktop Entry Specification:
# - https://standards.freedesktop.org/desktop-entry-spec/latest/
# - https://standards.freedesktop.org/desktop-entry-spec/latest/ar01s06.html
text = ''
[Desktop Entry]
Version=1.0
Type=XSession
TryExec=${script}
Exec=${script}
Name=${sessionName}
DesktopNames=${desktopNames}
'';
} // {
providedSessions = [ sessionName ];
})
)
(cartesianProductOfSets { dm = dms; wm = wms; })
);
# Make xsessions and wayland sessions available in XDG_DATA_DIRS
# as some programs have behavior that depends on them being present
environment.sessionVariables.XDG_DATA_DIRS = [
"${cfg.displayManager.sessionData.desktops}/share"
];
};
imports = [
(mkRemovedOptionModule [ "services" "xserver" "displayManager" "desktopManagerHandlesLidAndPower" ]
"The option is no longer necessary because all display managers have already delegated lid management to systemd.")
(mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "logsXsession" ] [ "services" "xserver" "displayManager" "job" "logToFile" ])
(mkRenamedOptionModule [ "services" "xserver" "displayManager" "logToJournal" ] [ "services" "xserver" "displayManager" "job" "logToJournal" ])
(mkRenamedOptionModule [ "services" "xserver" "displayManager" "extraSessionFilesPackages" ] [ "services" "xserver" "displayManager" "sessionPackages" ])
];
}
|