f00440fac5
This is needed by most window managers. Desktop environments usually launch dbus-launch if a session hasn't been started yet so this shouldn't hurt. The worst it can happen is that one dbus session will be unused in case it's started twice. The GDM change is backported from recent gdm.
321 lines
10 KiB
Nix
321 lines
10 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 xdm, kdm, gdb, or
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# SLiM). 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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vaapiDrivers = pkgs.buildEnv {
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name = "vaapi-drivers";
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paths = cfg.vaapiDrivers;
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# We only want /lib/dri, but with a single input path, we need "/" for it to work
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pathsToLink = [ "/" ];
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};
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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: ${if fontconfig.hinting.autohint then "1" else "0"}
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Xft.hintstyle: hint${fontconfig.hinting.style}
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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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#! /bin/sh
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. /etc/profile
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cd "$HOME"
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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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${optionalString (!cfg.displayManager.job.logsXsession) ''
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exec > ~/.xsession-errors 2>&1
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''}
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${optionalString cfg.startDbusSession ''
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if test -z "$DBUS_SESSION_BUS_ADDRESS"; then
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exec ${pkgs.dbus.tools}/bin/dbus-launch --exit-with-session "$0" "$sessionType"
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fi
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''}
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${optionalString cfg.displayManager.desktopManagerHandlesLidAndPower ''
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# Stop systemd from handling the power button and lid switch,
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# since presumably the desktop environment will handle these.
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if [ -z "$_INHIBITION_LOCK_TAKEN" ]; then
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export _INHIBITION_LOCK_TAKEN=1
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if ! ${config.systemd.package}/bin/loginctl show-session $XDG_SESSION_ID | grep -q '^RemoteHost='; then
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exec ${config.systemd.package}/bin/systemd-inhibit --what=handle-lid-switch:handle-power-key --why="See NixOS configuration option 'services.xserver.displayManager.desktopManagerHandlesLidAndPower' for more information." "$0" "$sessionType"
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fi
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fi
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''}
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${optionalString cfg.startGnuPGAgent ''
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if test -z "$SSH_AUTH_SOCK"; then
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# Restart this script as a child of the GnuPG agent.
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exec "${pkgs.gnupg}/bin/gpg-agent" \
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--enable-ssh-support --daemon \
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--pinentry-program "${pkgs.pinentry}/bin/pinentry-gtk-2" \
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--write-env-file "$HOME/.gpg-agent-info" \
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"$0" "$sessionType"
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fi
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''}
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# Handle being called by kdm.
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if test "''${1:0:1}" = /; then eval exec "$1"; fi
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# Start PulseAudio if enabled.
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${optionalString (config.hardware.pulseaudio.enable) ''
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${optionalString (!config.hardware.pulseaudio.systemWide)
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"${config.hardware.pulseaudio.package}/bin/pulseaudio --start"
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}
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# Publish access credentials in the root window.
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${config.hardware.pulseaudio.package}/bin/pactl load-module module-x11-publish "display=$DISPLAY"
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# Keep track of devices. Mostly useful for Phonon/KDE.
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${config.hardware.pulseaudio.package}/bin/pactl load-module module-device-manager "do_routing=1"
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''}
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# Tell systemd about our $DISPLAY. This is needed by the
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# ssh-agent unit.
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${config.systemd.package}/bin/systemctl --user import-environment DISPLAY
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# Load X defaults.
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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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${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
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fi
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export LIBVA_DRIVERS_PATH=${vaapiDrivers}/lib/dri
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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 $HOME/.compose-cache
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${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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# Allow the user to setup a custom session type.
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if test -x ~/.xsession; then
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exec ~/.xsession
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else
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if test "$sessionType" = "custom"; then
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sessionType="" # fall-thru if there is no ~/.xsession
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fi
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fi
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# The session type is "<desktop-manager> + <window-manager>", so
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# extract those.
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windowManager="''${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 $windowManager in
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${concatMapStrings (s: ''
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(${s.name})
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${s.start}
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;;
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'') 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 $desktopManager in
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${concatMapStrings (s: ''
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(${s.name})
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${s.start}
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;;
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'') dm}
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(*) echo "$0: Desktop manager '$desktopManager' not found.";;
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esac
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test -n "$waitPID" && wait "$waitPID"
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exit 0
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'';
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mkDesktops = names: pkgs.runCommand "desktops" {}
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''
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mkdir -p $out
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${concatMapStrings (n: ''
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cat - > "$out/${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} '${n}'
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X-GDM-BypassXsession=true
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Name=${n}
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Comment=
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EODESKTOP
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'') names}
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'';
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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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apply = toString;
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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 = "Shell commands executed just before the window or desktop manager is started.";
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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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desktopManagerHandlesLidAndPower = 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 should prevent systemd from handling
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lid and power events. This is normally handled by the desktop
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environment's power manager. Turn this off when using a minimal
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X11 setup without a full power 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 windows 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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};
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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.slim}/bin/slim"
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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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example = { SLIM_CFGFILE = "/etc/slim.conf"; };
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description = "Additional environment variables needed by the display manager.";
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};
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logsXsession = 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
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output of the session script to
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<filename>~/.xsession-errors</filename>.
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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}/bin/X";
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};
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}
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