nixpkgs/nixos/modules/services/x11/display-managers/default.nix
Tor Hedin Brønner 3d70d4ba0b
nixos/displayManager: fix typo in legacy sessions (#76626)
xsession gets passed `dm` `wm`, so the desktop manager would be launched
before the window manager resulting in a regular desktop manager
session.

Fixes https://github.com/NixOS/nixpkgs/issues/76625
2019-12-29 02:02:24 +01:00

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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" ''
${optionalString (fontconfig.dpi != 0) ''Xft.dpi: ${toString fontconfig.dpi}''}
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"
${optionalString cfg.startDbusSession ''
if test -z "$DBUS_SESSION_BUS_ADDRESS"; then
exec ${pkgs.dbus.dbus-launch} --exit-with-session "$0" "$@"
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)
''}
# Start PulseAudio if enabled.
${optionalString (config.hardware.pulseaudio.enable) ''
# Publish access credentials in the root window.
if ${config.hardware.pulseaudio.package.out}/bin/pulseaudio --dump-modules | grep module-x11-publish &> /dev/null; then
${config.hardware.pulseaudio.package.out}/bin/pactl load-module module-x11-publish "display=$DISPLAY"
fi
''}
# Tell systemd about our $DISPLAY and $XAUTHORITY.
# This is needed by the ssh-agent unit.
#
# Also tell systemd about the dbus session bus address.
# This is required by user units using the session bus.
${config.systemd.package}/bin/systemctl --user import-environment DISPLAY XAUTHORITY DBUS_SESSION_BUS_ADDRESS
# 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
${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
fi
# Speed up application start by 50-150ms according to
# http://kdemonkey.blogspot.nl/2008/04/magic-trick.html
rm -rf "$HOME/.compose-cache"
mkdir "$HOME/.compose-cache"
# Work around KDE errors when a user first logs in and
# .local/share doesn't exist yet.
mkdir -p "$HOME/.local/share"
unset _DID_SYSTEMD_CAT
${cfg.displayManager.sessionCommands}
# Allow the user to execute commands at the beginning of the X session.
if test -f ~/.xprofile; then
source ~/.xprofile
fi
# Start systemd user services for graphical sessions
${config.systemd.package}/bin/systemctl --user start graphical-session.target
# Allow the user to setup a custom session type.
if test -x ~/.xsession; then
eval exec ~/.xsession "$@"
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
${xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions
fi
if test -d ${pkg}/share/wayland-sessions; then
${xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions
fi
'') cfg.displayManager.sessionPackages}
'';
dmDefault = cfg.desktopManager.default;
wmDefault = cfg.windowManager.default;
defaultSessionFromLegacyOptions = concatStringsSep "+" (filter (s: s != null) ([ dmDefault ] ++ optional (wmDefault != "none") wmDefault));
in
{
options = {
services.xserver.displayManager = {
xauthBin = mkOption {
internal = true;
default = "${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
${p}/share/wayland-sessions
'';
});
default = [];
description = ''
A list of packages containing x11 or wayland session files to be passed to the display manager.
'';
};
session = mkOption {
default = [];
example = literalExample
''
[ { manage = "desktop";
name = "xterm";
start = '''
''${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:
${concatStringsSep "\n " cfg.displayManager.sessionData.sessionNames}
'';
};
default =
if dmDefault != null || wmDefault != null then
defaultSessionFromLegacyOptions
else
null;
example = "gnome";
description = ''
Graphical session to pre-select in the session chooser (only effective for GDM and LightDM).
On GDM, LightDM and SDDM, it will also be used as a session for auto-login.
'';
};
job = {
preStart = mkOption {
type = types.lines;
default = "";
example = "rm -f /var/log/my-display-manager.log";
description = "Script executed before the display manager is started.";
};
execCmd = mkOption {
type = types.str;
example = literalExample ''
"''${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.
'';
};
};
};
};
config = {
assertions = [
{
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:
${concatStringsSep "\n " (map ({c, t}: t) (filter ({c, t}: c != null) [
{ c = dmDefault; t = "- services.xserver.desktopManager.default"; }
{ c = wmDefault; t = "- services.xserver.windowManager.default"; }
]))}
Please use
services.xserver.displayManager.defaultSession = "${concatStringsSep "+" (filter (s: s != null) [ dmDefault wmDefault ])}";
instead.
''
];
services.xserver.displayManager.xserverBin = "${xorg.xorgserver.out}/bin/X";
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"
${config.systemd.package}/bin/systemctl --user stop graphical-session.target
exit 0
'';
in
# We will generate every possible pair of WM and DM.
concatLists (
crossLists
(dm: wm: let
sessionName = "${dm.name}${optionalString (wm.name != "none") ("+" + wm.name)}";
script = xsession dm wm;
in
optional (dm.name != "none" || wm.name != "none")
(pkgs.writeTextFile {
name = "${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}
'';
} // {
providedSessions = [ sessionName ];
})
)
[dms wms]
);
};
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" ])
];
}