273 lines
8.3 KiB
Nix
273 lines
8.3 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, pkgs, ... }:
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with pkgs.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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pathsToLink = "/lib/dri";
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# To admit zero-length 'paths'
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postBuild = "
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mkdir -p $out/lib/dri
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";
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};
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# file provided by services.xserver.displayManager.session.script
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xsession = wm: dm: pkgs.writeScript "xsession"
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''
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#! /bin/sh
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. /etc/profile
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cd "$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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${optionalString (!cfg.displayManager.job.logsXsession) ''
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exec > ~/.xsession-errors 2>&1
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''}
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# Stop systemd from handling the power button and lid switch,
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# since presumably the desktop environment will handle these.
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if [ -z "$_INHIBITION_LOCK_TAKEN" ]; then
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export _INHIBITION_LOCK_TAKEN=1
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exec ${config.systemd.package}/bin/systemd-inhibit --what=handle-lid-switch:handle-power-key "$0" "$sessionType"
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fi
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${optionalString cfg.startOpenSSHAgent ''
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if test -z "$SSH_AUTH_SOCK"; then
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# Restart this script as a child of the SSH agent. (It is
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# also possible to start the agent as a child that prints
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# the required environment variabled on stdout, but in
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# that mode ssh-agent is not terminated when we log out.)
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export SSH_ASKPASS=${pkgs.x11_ssh_askpass}/libexec/x11-ssh-askpass
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exec ${pkgs.openssh}/bin/ssh-agent "$0" "$sessionType"
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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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${pkgs.pulseaudio}/bin/pulseaudio --start
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# Publish access credentials in the root window.
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${pkgs.pulseaudio}/bin/pactl load-module module-x11-publish "display=$DISPLAY"
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# Keep track of devices. Mostly useful for Phonon/KDE.
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${pkgs.pulseaudio}/bin/pactl load-module module-device-manager "do_routing=1"
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''}
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# Load X defaults.
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if 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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source /etc/profile
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${cfg.displayManager.sessionCommands}
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# Allow the user to setup a custom session type.
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if test -x ~/.xsession; then
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exec ~/.xsession
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else
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if test "$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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ensureDir $out
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${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} '${n}'
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Name=${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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imports = [ ./kdm.nix ./slim.nix ];
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options = {
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services.xserver.displayManager = {
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xauthBin = mkOption {
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default = "${xorg.xauth}/bin/xauth";
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description = "Path to the <command>xauth</command> program used by display managers.";
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};
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xserverBin = mkOption {
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default = "${xorg.xorgserver}/bin/X";
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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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default = [];
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example = [ "-ac" "-logverbose" "-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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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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type = types.string;
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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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session = mkOption {
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default = [];
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example = [
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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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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 = mkOption {
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default = {};
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type = types.uniq types.optionSet;
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description = "This option defines how to start the display manager.";
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options = {
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preStart = mkOption {
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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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example = "${pkgs.slim}/bin/slim";
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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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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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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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};
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}
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