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https://github.com/NixOS/nixpkgs.git
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d26393d60c
This is not correct and will in fact break things because they try to run before the target is reached. Ideally we'd get rid of it entirely, but WM users rely on this behavior, so allowlist some desktops to get the sane behavior, and fake the session for the rest until upstreams/NixOS modules catch up.
531 lines
19 KiB
Nix
531 lines
19 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, options, pkgs, ... }:
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with lib;
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let
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cfg = config.services.xserver;
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opt = options.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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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: ${fontconfig.hinting.style}
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'';
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# FIXME: this is an ugly hack.
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# Some sessions (read: most WMs) don't activate systemd's `graphical-session.target`.
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# Other sessions (read: most non-WMs) expect `graphical-session.target` to be reached
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# when the entire session is actually ready. We used to just unconditionally force
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# `graphical-session.target` to be activated in the session wrapper so things like
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# xdg-autostart-generator work on sessions that are wrong, but this broke sessions
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# that do things right. So, preserve this behavior (with some extra steps) by matching
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# on XDG_CURRENT_DESKTOP and deliberately ignoring sessions we know can do the right thing.
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fakeSession = action: ''
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session_is_systemd_aware=$(
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IFS=:
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for i in $XDG_CURRENT_DESKTOP; do
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case $i in
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KDE|GNOME|X-NIXOS-SYSTEMD-AWARE) echo "1"; exit; ;;
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*) ;;
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esac
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done
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)
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if [ -z "$session_is_systemd_aware" ]; then
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/run/current-system/systemd/bin/systemctl --user ${action} nixos-fake-graphical-session.target
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fi
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'';
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# file provided by services.xserver.displayManager.sessionData.wrapper
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xsessionWrapper = pkgs.writeScript "xsession-wrapper"
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''
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#! ${pkgs.bash}/bin/bash
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# Shared environment setup for graphical sessions.
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. /etc/profile
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if test -f ~/.profile; then
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source ~/.profile
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fi
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cd "$HOME"
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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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${optionalString cfg.displayManager.job.logToJournal ''
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if [ -z "$_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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${optionalString cfg.displayManager.job.logToFile ''
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exec &> >(tee ~/.xsession-errors)
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''}
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# Load X defaults. This should probably be safe on wayland too.
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${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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${xorg.xrdb}/bin/xrdb -merge ~/.Xdefaults
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fi
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# Import environment variables into the systemd user environment.
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${optionalString (cfg.displayManager.importedVariables != []) (
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"/run/current-system/systemd/bin/systemctl --user import-environment "
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+ toString (unique cfg.displayManager.importedVariables)
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)}
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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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compose_cache="''${XCOMPOSECACHE:-$HOME/.compose-cache}"
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mkdir -p "$compose_cache"
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# To avoid accidentally deleting a wrongly set up XCOMPOSECACHE directory,
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# defensively try to delete cache *files* only, following the file format specified in
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# https://gitlab.freedesktop.org/xorg/lib/libx11/-/blob/master/modules/im/ximcp/imLcIm.c#L353-358
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# sprintf (*res, "%s/%c%d_%03x_%08x_%08x", dir, _XimGetMyEndian(), XIM_CACHE_VERSION, (unsigned int)sizeof (DefTree), hash, hash2);
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${pkgs.findutils}/bin/find "$compose_cache" -maxdepth 1 -regextype posix-extended -regex '.*/[Bl][0-9]+_[0-9a-f]{3}_[0-9a-f]{8}_[0-9a-f]{8}' -delete
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unset compose_cache
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# Work around KDE errors when a user first logs in and
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# .local/share doesn't exist yet.
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mkdir -p "''${XDG_DATA_HOME:-$HOME/.local/share}"
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unset _DID_SYSTEMD_CAT
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${cfg.displayManager.sessionCommands}
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${fakeSession "start"}
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# Allow the user to setup a custom session type.
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if test -x ~/.xsession; then
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eval exec ~/.xsession "$@"
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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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# TODO: Do we need this? Should not the session always exist?
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echo "error: unknown session $1" 1>&2
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exit 1
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fi
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'';
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installedSessions = pkgs.runCommand "desktops"
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{ # trivial derivation
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preferLocalBuild = true;
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allowSubstitutes = false;
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}
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''
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mkdir -p "$out/share/"{xsessions,wayland-sessions}
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${concatMapStrings (pkg: ''
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for n in ${concatStringsSep " " pkg.providedSessions}; do
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if ! test -f ${pkg}/share/wayland-sessions/$n.desktop -o \
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-f ${pkg}/share/xsessions/$n.desktop; then
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echo "Couldn't find provided session name, $n.desktop, in session package ${pkg.name}:"
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echo " ${pkg}"
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return 1
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fi
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done
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if test -d ${pkg}/share/xsessions; then
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${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions
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fi
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if test -d ${pkg}/share/wayland-sessions; then
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${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions
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fi
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'') cfg.displayManager.sessionPackages}
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'';
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dmDefault = cfg.desktopManager.default;
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# fallback default for cases when only default wm is set
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dmFallbackDefault = if dmDefault != null then dmDefault else "none";
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wmDefault = cfg.windowManager.default;
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defaultSessionFromLegacyOptions = dmFallbackDefault + optionalString (wmDefault != null && wmDefault != "none") "+${wmDefault}";
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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 = "${xorg.xauth}/bin/xauth";
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defaultText = literalExpression ''"''${pkgs.xorg.xauth}/bin/xauth"'';
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description = lib.mdDoc "Path to the {command}`xauth` 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 = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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 = lib.mdDoc ''
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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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sessionPackages = mkOption {
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type = with types; listOf (package // {
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description = "package with provided sessions";
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check = p: assertMsg
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(package.check p && p ? providedSessions
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&& p.providedSessions != [] && all isString p.providedSessions)
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''
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Package, '${p.name}', did not specify any session names, as strings, in
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'passthru.providedSessions'. This is required when used as a session package.
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The session names can be looked up in:
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${p}/share/xsessions
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${p}/share/wayland-sessions
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'';
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});
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default = [];
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description = lib.mdDoc ''
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A list of packages containing x11 or wayland session files to be passed to the display manager.
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'';
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};
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session = mkOption {
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default = [];
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type = types.listOf types.attrs;
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example = literalExpression
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''
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[ { manage = "desktop";
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name = "xterm";
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start = '''
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''${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 = lib.mdDoc ''
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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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{var}`waitPID` 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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{var}`manage` either to `"window"`
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or `"desktop"`.
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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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};
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sessionData = mkOption {
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description = lib.mdDoc "Data exported for display managers’ convenience";
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internal = true;
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default = {};
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apply = val: {
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wrapper = xsessionWrapper;
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desktops = installedSessions;
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sessionNames = concatMap (p: p.providedSessions) cfg.displayManager.sessionPackages;
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# We do not want to force users to set defaultSession when they have only single DE.
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autologinSession =
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if cfg.displayManager.defaultSession != null then
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cfg.displayManager.defaultSession
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else if cfg.displayManager.sessionData.sessionNames != [] then
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head cfg.displayManager.sessionData.sessionNames
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else
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null;
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};
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};
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defaultSession = mkOption {
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type = with types; nullOr str // {
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description = "session name";
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check = d:
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assertMsg (d != null -> (str.check d && elem d cfg.displayManager.sessionData.sessionNames)) ''
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Default graphical session, '${d}', not found.
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Valid names for 'services.xserver.displayManager.defaultSession' are:
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${concatStringsSep "\n " cfg.displayManager.sessionData.sessionNames}
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'';
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};
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default =
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if dmDefault != null || wmDefault != null then
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defaultSessionFromLegacyOptions
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else
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null;
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defaultText = literalMD ''
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Taken from display manager settings or window manager settings, if either is set.
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'';
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example = "gnome";
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description = lib.mdDoc ''
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Graphical session to pre-select in the session chooser (only effective for GDM, LightDM and SDDM).
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On GDM, LightDM and SDDM, it will also be used as a session for auto-login.
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'';
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};
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importedVariables = mkOption {
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type = types.listOf (types.strMatching "[a-zA-Z_][a-zA-Z0-9_]*");
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visible = false;
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description = lib.mdDoc ''
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Environment variables to import into the systemd user environment.
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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 = lib.mdDoc "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 = literalExpression ''"''${pkgs.lightdm}/bin/lightdm"'';
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description = lib.mdDoc "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 = lib.mdDoc "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 = lib.mdDoc ''
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Whether the display manager redirects the output of the
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session script to {file}`~/.xsession-errors`.
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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 = lib.mdDoc ''
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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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# Configuration for automatic login. Common for all DM.
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autoLogin = mkOption {
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type = types.submodule ({ config, options, ... }: {
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options = {
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enable = mkOption {
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type = types.bool;
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default = config.user != null;
|
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defaultText = literalExpression "config.${options.user} != null";
|
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description = lib.mdDoc ''
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Automatically log in as {option}`autoLogin.user`.
|
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'';
|
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};
|
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|
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user = mkOption {
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type = types.nullOr types.str;
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default = null;
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description = lib.mdDoc ''
|
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User to be used for the automatic login.
|
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'';
|
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};
|
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};
|
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});
|
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|
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default = {};
|
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description = lib.mdDoc ''
|
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Auto login configuration attrset.
|
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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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assertions = [
|
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{ assertion = cfg.displayManager.autoLogin.enable -> cfg.displayManager.autoLogin.user != null;
|
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message = ''
|
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services.xserver.displayManager.autoLogin.enable requires services.xserver.displayManager.autoLogin.user to be set
|
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'';
|
||
}
|
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{
|
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assertion = cfg.desktopManager.default != null || cfg.windowManager.default != null -> cfg.displayManager.defaultSession == defaultSessionFromLegacyOptions;
|
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message = "You cannot use both services.xserver.displayManager.defaultSession option and legacy options (services.xserver.desktopManager.default and services.xserver.windowManager.default).";
|
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}
|
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];
|
||
|
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warnings =
|
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mkIf (dmDefault != null || wmDefault != null) [
|
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''
|
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The following options are deprecated:
|
||
${concatStringsSep "\n " (map ({c, t}: t) (filter ({c, t}: c != null) [
|
||
{ c = dmDefault; t = "- services.xserver.desktopManager.default"; }
|
||
{ c = wmDefault; t = "- services.xserver.windowManager.default"; }
|
||
]))}
|
||
Please use
|
||
services.xserver.displayManager.defaultSession = "${defaultSessionFromLegacyOptions}";
|
||
instead.
|
||
''
|
||
];
|
||
|
||
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.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"
|
||
|
||
${fakeSession "stop"}
|
||
|
||
exit 0
|
||
'';
|
||
in
|
||
# We will generate every possible pair of WM and DM.
|
||
concatLists (
|
||
builtins.map
|
||
({dm, wm}: let
|
||
sessionName = "${dm.name}${optionalString (wm.name != "none") ("+" + wm.name)}";
|
||
script = xsession dm wm;
|
||
desktopNames = if dm ? desktopNames
|
||
then concatStringsSep ";" dm.desktopNames
|
||
else sessionName;
|
||
in
|
||
optional (dm.name != "none" || wm.name != "none")
|
||
(pkgs.writeTextFile {
|
||
name = "${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}
|
||
DesktopNames=${desktopNames}
|
||
'';
|
||
} // {
|
||
providedSessions = [ sessionName ];
|
||
})
|
||
)
|
||
(cartesianProductOfSets { dm = dms; wm = wms; })
|
||
);
|
||
|
||
# Make xsessions and wayland sessions available in XDG_DATA_DIRS
|
||
# as some programs have behavior that depends on them being present
|
||
environment.sessionVariables.XDG_DATA_DIRS = [
|
||
"${cfg.displayManager.sessionData.desktops}/share"
|
||
];
|
||
};
|
||
|
||
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" ])
|
||
];
|
||
|
||
}
|