319 lines
12 KiB
Nix
319 lines
12 KiB
Nix
# 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, options, pkgs, ... }:
|
|
|
|
let
|
|
inherit (lib) mkOption types literalExpression optionalString;
|
|
|
|
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: ${fontconfig.hinting.style}
|
|
'';
|
|
|
|
# FIXME: this is an ugly hack.
|
|
# Some sessions (read: most WMs) don't activate systemd's `graphical-session.target`.
|
|
# Other sessions (read: most non-WMs) expect `graphical-session.target` to be reached
|
|
# when the entire session is actually ready. We used to just unconditionally force
|
|
# `graphical-session.target` to be activated in the session wrapper so things like
|
|
# xdg-autostart-generator work on sessions that are wrong, but this broke sessions
|
|
# that do things right. So, preserve this behavior (with some extra steps) by matching
|
|
# on XDG_CURRENT_DESKTOP and deliberately ignoring sessions we know can do the right thing.
|
|
fakeSession = action: ''
|
|
session_is_systemd_aware=$(
|
|
IFS=:
|
|
for i in $XDG_CURRENT_DESKTOP; do
|
|
case $i in
|
|
KDE|GNOME|Pantheon|X-NIXOS-SYSTEMD-AWARE) echo "1"; exit; ;;
|
|
*) ;;
|
|
esac
|
|
done
|
|
)
|
|
|
|
if [ -z "$session_is_systemd_aware" ]; then
|
|
/run/current-system/systemd/bin/systemctl --user ${action} nixos-fake-graphical-session.target
|
|
fi
|
|
'';
|
|
|
|
# file provided by services.xserver.displayManager.sessionData.wrapper
|
|
xsessionWrapper = pkgs.writeScript "xsession-wrapper"
|
|
''
|
|
#! ${pkgs.bash}/bin/bash
|
|
|
|
# Shared environment setup for graphical sessions.
|
|
|
|
. /etc/profile
|
|
if test -f ~/.profile; then
|
|
source ~/.profile
|
|
fi
|
|
|
|
cd "$HOME"
|
|
|
|
# Allow the user to execute commands at the beginning of the X session.
|
|
if test -f ~/.xprofile; then
|
|
source ~/.xprofile
|
|
fi
|
|
|
|
${optionalString config.services.displayManager.logToJournal ''
|
|
if [ -z "$_DID_SYSTEMD_CAT" ]; then
|
|
export _DID_SYSTEMD_CAT=1
|
|
exec ${config.systemd.package}/bin/systemd-cat -t xsession "$0" "$@"
|
|
fi
|
|
''}
|
|
|
|
${optionalString config.services.displayManager.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.
|
|
${optionalString (cfg.displayManager.importedVariables != []) (
|
|
"/run/current-system/systemd/bin/systemctl --user import-environment "
|
|
+ toString (lib.unique cfg.displayManager.importedVariables)
|
|
)}
|
|
|
|
# Speed up application start by 50-150ms according to
|
|
# https://kdemonkey.blogspot.com/2008/04/magic-trick.html
|
|
compose_cache="''${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}
|
|
|
|
${fakeSession "start"}
|
|
|
|
# Allow the user to setup a custom session type.
|
|
if test -x ~/.xsession; then
|
|
eval exec ~/.xsession "$@"
|
|
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 $1" 1>&2
|
|
exit 1
|
|
fi
|
|
'';
|
|
in
|
|
|
|
{
|
|
options = {
|
|
|
|
services.xserver.displayManager = {
|
|
|
|
xauthBin = mkOption {
|
|
internal = true;
|
|
default = "${xorg.xauth}/bin/xauth";
|
|
defaultText = literalExpression ''"''${pkgs.xorg.xauth}/bin/xauth"'';
|
|
description = "Path to the {command}`xauth` program used by display managers.";
|
|
};
|
|
|
|
xserverBin = mkOption {
|
|
type = types.path;
|
|
description = "Path to the X server used by display managers.";
|
|
};
|
|
|
|
xserverArgs = mkOption {
|
|
type = types.listOf types.str;
|
|
default = [];
|
|
example = [ "-ac" "-logverbose" "-verbose" "-nolisten tcp" ];
|
|
description = "List of arguments for the X server.";
|
|
};
|
|
|
|
setupCommands = mkOption {
|
|
type = types.lines;
|
|
default = "";
|
|
description = ''
|
|
Shell commands executed just after the X server has started.
|
|
|
|
This option is only effective for display managers for which this feature
|
|
is supported; currently these are LightDM, GDM and SDDM.
|
|
'';
|
|
};
|
|
|
|
sessionCommands = mkOption {
|
|
type = types.lines;
|
|
default = "";
|
|
example =
|
|
''
|
|
xmessage "Hello World!" &
|
|
'';
|
|
description = ''
|
|
Shell commands executed just before the window or desktop manager is
|
|
started. These commands are not currently sourced for Wayland sessions.
|
|
'';
|
|
};
|
|
|
|
session = mkOption {
|
|
default = [];
|
|
type = types.listOf types.attrs;
|
|
example = literalExpression
|
|
''
|
|
[ { manage = "desktop";
|
|
name = "xterm";
|
|
start = '''
|
|
''${pkgs.xterm}/bin/xterm -ls &
|
|
waitPID=$!
|
|
''';
|
|
}
|
|
]
|
|
'';
|
|
description = ''
|
|
List of sessions supported with the command used to start each
|
|
session. Each session script can set the
|
|
{var}`waitPID` shell variable to make this script
|
|
wait until the end of the user session. Each script is used
|
|
to define either a window manager or a desktop manager. These
|
|
can be differentiated by setting the attribute
|
|
{var}`manage` either to `"window"`
|
|
or `"desktop"`.
|
|
|
|
The list of desktop manager and window manager should appear
|
|
inside the display manager with the desktop manager name
|
|
followed by the window manager name.
|
|
'';
|
|
};
|
|
|
|
importedVariables = mkOption {
|
|
type = types.listOf (types.strMatching "[a-zA-Z_][a-zA-Z0-9_]*");
|
|
visible = false;
|
|
description = ''
|
|
Environment variables to import into the systemd user environment.
|
|
'';
|
|
};
|
|
|
|
};
|
|
|
|
};
|
|
|
|
config = {
|
|
services.displayManager.sessionData.wrapper = xsessionWrapper;
|
|
|
|
services.xserver.displayManager.xserverBin = "${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.nixos-fake-graphical-session = {
|
|
unitConfig = {
|
|
Description = "Fake graphical-session target for non-systemd-aware sessions";
|
|
BindsTo = "graphical-session.target";
|
|
};
|
|
};
|
|
|
|
# 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.displayManager.sessionPackages =
|
|
let
|
|
dms = lib.filter (s: s.manage == "desktop") cfg.displayManager.session;
|
|
wms = lib.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"
|
|
|
|
${fakeSession "stop"}
|
|
|
|
exit 0
|
|
'';
|
|
in
|
|
# We will generate every possible pair of WM and DM.
|
|
lib.concatLists (
|
|
lib.mapCartesianProduct
|
|
({dm, wm}: let
|
|
sessionName = "${dm.name}${optionalString (wm.name != "none") ("+" + wm.name)}";
|
|
script = xsession dm wm;
|
|
desktopNames = if dm ? desktopNames
|
|
then lib.concatStringsSep ";" dm.desktopNames
|
|
else sessionName;
|
|
in
|
|
lib.optional (dm.name != "none" || wm.name != "none")
|
|
(pkgs.writeTextFile {
|
|
name = "${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 ];
|
|
})
|
|
)
|
|
{ dm = dms; wm = wms; }
|
|
);
|
|
};
|
|
|
|
imports = [
|
|
(lib.mkRemovedOptionModule [ "services" "xserver" "displayManager" "desktopManagerHandlesLidAndPower" ]
|
|
"The option is no longer necessary because all display managers have already delegated lid management to systemd.")
|
|
(lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "logsXsession" ] [ "services" "displayManager" "logToFile" ])
|
|
(lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "logToJournal" ] [ "services" "displayManager" "logToJournal" ])
|
|
(lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "extraSessionFilesPackages" ] [ "services" "displayManager" "sessionPackages" ])
|
|
];
|
|
|
|
}
|