ce26b3eaf0
The SLIM project is abandoned and their last release was in 2013. Because of this it poses a security risk to systems, no one is working on it or picked up maintenance. It also lacks compatibility with systemd and logind sessions. For users, there liikely isn't anything like slim that's as lightweight in terms of dependencies.
376 lines
12 KiB
Nix
376 lines
12 KiB
Nix
# This module declares the options to define a *display manager*, the
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# program responsible for handling X logins (such as LightDM, GDM, or SDDM).
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# The display manager allows the user to select a *session
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# type*. When the user logs in, the display manager starts the
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# *session script* ("xsession" below) to launch the selected session
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# type. The session type defines two things: the *desktop manager*
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# (e.g., KDE, Gnome or a plain xterm), and optionally the *window
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# manager* (e.g. kwin or twm).
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.xserver;
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xorg = pkgs.xorg;
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fontconfig = config.fonts.fontconfig;
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xresourcesXft = pkgs.writeText "Xresources-Xft" ''
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${optionalString (fontconfig.dpi != 0) ''Xft.dpi: ${toString fontconfig.dpi}''}
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Xft.antialias: ${if fontconfig.antialias then "1" else "0"}
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Xft.rgba: ${fontconfig.subpixel.rgba}
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Xft.lcdfilter: lcd${fontconfig.subpixel.lcdfilter}
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Xft.hinting: ${if fontconfig.hinting.enable then "1" else "0"}
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Xft.autohint: ${if fontconfig.hinting.autohint then "1" else "0"}
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Xft.hintstyle: hintslight
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'';
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mkCases = session:
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concatStrings (
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mapAttrsToList (name: starts: ''
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(${name})
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${concatMapStringsSep "\n " (n: n.start) starts}
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;;
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'') (lib.groupBy (n: n.name) session)
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);
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# file provided by services.xserver.displayManager.session.wrapper
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xsessionWrapper = pkgs.writeScript "xsession-wrapper"
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''
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#! ${pkgs.bash}/bin/bash
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# Shared environment setup for graphical sessions.
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. /etc/profile
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cd "$HOME"
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${optionalString cfg.startDbusSession ''
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if test -z "$DBUS_SESSION_BUS_ADDRESS"; then
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exec ${pkgs.dbus.dbus-launch} --exit-with-session "$0" "$@"
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fi
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''}
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${optionalString cfg.displayManager.job.logToJournal ''
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if [ -z "$_DID_SYSTEMD_CAT" ]; then
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export _DID_SYSTEMD_CAT=1
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exec ${config.systemd.package}/bin/systemd-cat -t xsession "$0" "$@"
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fi
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''}
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${optionalString cfg.displayManager.job.logToFile ''
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exec &> >(tee ~/.xsession-errors)
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''}
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# Start PulseAudio if enabled.
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${optionalString (config.hardware.pulseaudio.enable) ''
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# Publish access credentials in the root window.
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if ${config.hardware.pulseaudio.package.out}/bin/pulseaudio --dump-modules | grep module-x11-publish &> /dev/null; then
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${config.hardware.pulseaudio.package.out}/bin/pactl load-module module-x11-publish "display=$DISPLAY"
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fi
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''}
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# Tell systemd about our $DISPLAY and $XAUTHORITY.
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# This is needed by the ssh-agent unit.
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#
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# Also tell systemd about the dbus session bus address.
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# This is required by user units using the session bus.
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${config.systemd.package}/bin/systemctl --user import-environment DISPLAY XAUTHORITY DBUS_SESSION_BUS_ADDRESS
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# Load X defaults. This should probably be safe on wayland too.
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${xorg.xrdb}/bin/xrdb -merge ${xresourcesXft}
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if test -e ~/.Xresources; then
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${xorg.xrdb}/bin/xrdb -merge ~/.Xresources
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elif test -e ~/.Xdefaults; then
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${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
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fi
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# Speed up application start by 50-150ms according to
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# http://kdemonkey.blogspot.nl/2008/04/magic-trick.html
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rm -rf "$HOME/.compose-cache"
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mkdir "$HOME/.compose-cache"
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# Work around KDE errors when a user first logs in and
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# .local/share doesn't exist yet.
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mkdir -p "$HOME/.local/share"
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unset _DID_SYSTEMD_CAT
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${cfg.displayManager.sessionCommands}
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# Allow the user to execute commands at the beginning of the X session.
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if test -f ~/.xprofile; then
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source ~/.xprofile
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fi
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# Start systemd user services for graphical sessions
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${config.systemd.package}/bin/systemctl --user start graphical-session.target
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# Allow the user to setup a custom session type.
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if test -x ~/.xsession; then
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eval exec ~/.xsession "$@"
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fi
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if test "$1"; then
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# Run the supplied session command. Remove any double quotes with eval.
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eval exec "$@"
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else
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# Fall back to the default window/desktopManager
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exec ${cfg.displayManager.session.script}
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fi
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'';
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# file provided by services.xserver.displayManager.session.script
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xsession = wm: dm: pkgs.writeScript "xsession"
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''
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#! ${pkgs.bash}/bin/bash
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# Legacy session script used to construct .desktop files from
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# `services.xserver.displayManager.session` entries. Called from
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# `sessionWrapper`.
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# Expected parameters:
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# $1 = <desktop-manager>+<window-manager>
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# The first argument of this script is the session type.
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sessionType="$1"
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if [ "$sessionType" = default ]; then sessionType=""; fi
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# The session type is "<desktop-manager>+<window-manager>", so
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# extract those (see:
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# http://wiki.bash-hackers.org/syntax/pe#substring_removal).
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windowManager="''${sessionType##*+}"
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: ''${windowManager:=${cfg.windowManager.default}}
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desktopManager="''${sessionType%%+*}"
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: ''${desktopManager:=${cfg.desktopManager.default}}
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# Start the window manager.
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case "$windowManager" in
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${mkCases wm}
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(*) echo "$0: Window manager '$windowManager' not found.";;
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esac
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# Start the desktop manager.
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case "$desktopManager" in
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${mkCases dm}
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(*) echo "$0: Desktop manager '$desktopManager' not found.";;
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esac
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${optionalString cfg.updateDbusEnvironment ''
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${lib.getBin pkgs.dbus}/bin/dbus-update-activation-environment --systemd --all
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''}
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test -n "$waitPID" && wait "$waitPID"
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${config.systemd.package}/bin/systemctl --user stop graphical-session.target
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exit 0
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'';
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# Desktop Entry Specification:
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# - https://standards.freedesktop.org/desktop-entry-spec/latest/
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# - https://standards.freedesktop.org/desktop-entry-spec/latest/ar01s06.html
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mkDesktops = names: pkgs.runCommand "desktops"
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{ # trivial derivation
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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''
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mkdir -p "$out/share/xsessions"
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${concatMapStrings (n: ''
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cat - > "$out/share/xsessions/${n}.desktop" << EODESKTOP
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[Desktop Entry]
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Version=1.0
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Type=XSession
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TryExec=${cfg.displayManager.session.script}
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Exec=${cfg.displayManager.session.script} "${n}"
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Name=${n}
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Comment=
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EODESKTOP
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'') names}
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${concatMapStrings (pkg: ''
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if test -d ${pkg}/share/xsessions; then
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${xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions
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fi
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'') cfg.displayManager.extraSessionFilePackages}
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${concatMapStrings (pkg: ''
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if test -d ${pkg}/share/wayland-sessions; then
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mkdir -p "$out/share/wayland-sessions"
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${xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions
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fi
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'') cfg.displayManager.extraSessionFilePackages}
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'';
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in
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{
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options = {
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services.xserver.displayManager = {
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xauthBin = mkOption {
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internal = true;
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default = "${xorg.xauth}/bin/xauth";
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description = "Path to the <command>xauth</command> program used by display managers.";
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};
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xserverBin = mkOption {
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type = types.path;
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description = "Path to the X server used by display managers.";
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};
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xserverArgs = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "-ac" "-logverbose" "-verbose" "-nolisten tcp" ];
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description = "List of arguments for the X server.";
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};
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setupCommands = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed just after the X server has started.
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This option is only effective for display managers for which this feature
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is supported; currently these are LightDM, GDM and SDDM.
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'';
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};
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sessionCommands = mkOption {
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type = types.lines;
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default = "";
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example =
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''
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xmessage "Hello World!" &
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'';
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description = ''
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Shell commands executed just before the window or desktop manager is
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started. These commands are not currently sourced for Wayland sessions.
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'';
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};
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hiddenUsers = mkOption {
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type = types.listOf types.str;
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default = [ "nobody" ];
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description = ''
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A list of users which will not be shown in the display manager.
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'';
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};
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extraSessionFilePackages = mkOption {
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type = types.listOf types.package;
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default = [];
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description = ''
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A list of packages containing xsession files to be passed to the display manager.
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'';
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};
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session = mkOption {
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default = [];
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example = literalExample
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''
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[ { manage = "desktop";
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name = "xterm";
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start = '''
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''${pkgs.xterm}/bin/xterm -ls &
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waitPID=$!
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''';
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}
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]
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'';
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description = ''
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List of sessions supported with the command used to start each
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session. Each session script can set the
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<varname>waitPID</varname> shell variable to make this script
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wait until the end of the user session. Each script is used
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to define either a window manager or a desktop manager. These
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can be differentiated by setting the attribute
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<varname>manage</varname> either to <literal>"window"</literal>
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or <literal>"desktop"</literal>.
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The list of desktop manager and window manager should appear
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inside the display manager with the desktop manager name
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followed by the window manager name.
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'';
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apply = list: rec {
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wm = filter (s: s.manage == "window") list;
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dm = filter (s: s.manage == "desktop") list;
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names = flip concatMap dm
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(d: map (w: d.name + optionalString (w.name != "none") ("+" + w.name))
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(filter (w: d.name != "none" || w.name != "none") wm));
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desktops = mkDesktops names;
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script = xsession wm dm;
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wrapper = xsessionWrapper;
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};
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};
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job = {
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preStart = mkOption {
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type = types.lines;
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default = "";
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example = "rm -f /var/log/my-display-manager.log";
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description = "Script executed before the display manager is started.";
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};
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execCmd = mkOption {
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type = types.str;
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example = literalExample ''
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"''${pkgs.lightdm}/bin/lightdm"
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'';
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description = "Command to start the display manager.";
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};
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environment = mkOption {
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type = types.attrsOf types.unspecified;
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default = {};
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description = "Additional environment variables needed by the display manager.";
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};
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logToFile = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether the display manager redirects the output of the
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session script to <filename>~/.xsession-errors</filename>.
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'';
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};
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logToJournal = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the display manager redirects the output of the
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session script to the systemd journal.
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'';
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};
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};
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};
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};
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config = {
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services.xserver.displayManager.xserverBin = "${xorg.xorgserver.out}/bin/X";
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systemd.user.targets.graphical-session = {
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unitConfig = {
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RefuseManualStart = false;
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StopWhenUnneeded = false;
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};
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};
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};
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imports = [
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(mkRemovedOptionModule [ "services" "xserver" "displayManager" "desktopManagerHandlesLidAndPower" ]
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"The option is no longer necessary because all display managers have already delegated lid management to systemd.")
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];
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}
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