diff options
Diffstat (limited to 'nixos/modules/services/display-managers/default.nix')
| -rw-r--r-- | nixos/modules/services/display-managers/default.nix | 257 |
1 files changed, 257 insertions, 0 deletions
diff --git a/nixos/modules/services/display-managers/default.nix b/nixos/modules/services/display-managers/default.nix new file mode 100644 index 0000000000000..7f5db9fbb509b --- /dev/null +++ b/nixos/modules/services/display-managers/default.nix @@ -0,0 +1,257 @@ +{ config, lib, pkgs, ... }: + +let + cfg = config.services.displayManager; + + installedSessions = pkgs.runCommand "desktops" + { # trivial derivation + preferLocalBuild = true; + allowSubstitutes = false; + } + '' + mkdir -p "$out/share/"{xsessions,wayland-sessions} + + ${lib.concatMapStrings (pkg: '' + for n in ${lib.concatStringsSep " " pkg.providedSessions}; do + if ! test -f ${pkg}/share/wayland-sessions/$n.desktop -o \ + -f ${pkg}/share/xsessions/$n.desktop; then + echo "Couldn't find provided session name, $n.desktop, in session package ${pkg.name}:" + echo " ${pkg}" + return 1 + fi + done + + if test -d ${pkg}/share/xsessions; then + ${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/xsessions $out/share/xsessions + fi + if test -d ${pkg}/share/wayland-sessions; then + ${pkgs.buildPackages.xorg.lndir}/bin/lndir ${pkg}/share/wayland-sessions $out/share/wayland-sessions + fi + '') cfg.sessionPackages} + ''; + + dmDefault = config.services.xserver.desktopManager.default; + # fallback default for cases when only default wm is set + dmFallbackDefault = if dmDefault != null then dmDefault else "none"; + wmDefault = config.services.xserver.windowManager.default; + defaultSessionFromLegacyOptions = dmFallbackDefault + lib.optionalString (wmDefault != null && wmDefault != "none") "+${wmDefault}"; +in +{ + options = { + services.displayManager = { + enable = lib.mkEnableOption "systemd's display-manager service"; + + preStart = lib.mkOption { + type = lib.types.lines; + default = ""; + example = "rm -f /var/log/my-display-manager.log"; + description = lib.mdDoc "Script executed before the display manager is started."; + }; + + execCmd = lib.mkOption { + type = lib.types.str; + example = lib.literalExpression ''"''${pkgs.lightdm}/bin/lightdm"''; + description = lib.mdDoc "Command to start the display manager."; + }; + + environment = lib.mkOption { + type = with lib.types; attrsOf unspecified; + default = {}; + description = lib.mdDoc "Additional environment variables needed by the display manager."; + }; + + hiddenUsers = lib.mkOption { + type = with lib.types; listOf str; + default = [ "nobody" ]; + description = lib.mdDoc '' + A list of users which will not be shown in the display manager. + ''; + }; + + logToFile = lib.mkOption { + type = lib.types.bool; + default = false; + description = lib.mdDoc '' + Whether the display manager redirects the output of the + session script to {file}`~/.xsession-errors`. + ''; + }; + + logToJournal = lib.mkOption { + type = lib.types.bool; + default = true; + description = lib.mdDoc '' + Whether the display manager redirects the output of the + session script to the systemd journal. + ''; + }; + + # Configuration for automatic login. Common for all DM. + autoLogin = lib.mkOption { + type = lib.types.submodule ({ config, options, ... }: { + options = { + enable = lib.mkOption { + type = lib.types.bool; + default = config.user != null; + defaultText = lib.literalExpression "config.${options.user} != null"; + description = lib.mdDoc '' + Automatically log in as {option}`autoLogin.user`. + ''; + }; + + user = lib.mkOption { + type = with lib.types; nullOr str; + default = null; + description = lib.mdDoc '' + User to be used for the automatic login. + ''; + }; + }; + }); + + default = {}; + description = lib.mdDoc '' + Auto login configuration attrset. + ''; + }; + + defaultSession = lib.mkOption { + type = lib.types.nullOr lib.types.str // { + description = "session name"; + check = d: + lib.assertMsg (d != null -> (lib.types.str.check d && lib.elem d config.services.displayManager.sessionData.sessionNames)) '' + Default graphical session, '${d}', not found. + Valid names for 'services.displayManager.defaultSession' are: + ${lib.concatStringsSep "\n " cfg.displayManager.sessionData.sessionNames} + ''; + }; + default = + if dmDefault != null || wmDefault != null then + defaultSessionFromLegacyOptions + else + null; + defaultText = lib.literalMD '' + Taken from display manager settings or window manager settings, if either is set. + ''; + example = "gnome"; + description = lib.mdDoc '' + Graphical session to pre-select in the session chooser (only effective for GDM, LightDM and SDDM). + + On GDM, LightDM and SDDM, it will also be used as a session for auto-login. + ''; + }; + + sessionData = lib.mkOption { + description = lib.mdDoc "Data exported for display managers’ convenience"; + internal = true; + default = {}; + }; + + sessionPackages = lib.mkOption { + type = lib.types.listOf (lib.types.package // { + description = "package with provided sessions"; + check = p: lib.assertMsg + (lib.types.package.check p && p ? providedSessions + && p.providedSessions != [] && lib.all lib.isString p.providedSessions) + '' + Package, '${p.name}', did not specify any session names, as strings, in + 'passthru.providedSessions'. This is required when used as a session package. + + The session names can be looked up in: + ${p}/share/xsessions + ${p}/share/wayland-sessions + ''; + }); + default = []; + description = lib.mdDoc '' + A list of packages containing x11 or wayland session files to be passed to the display manager. + ''; + }; + }; + }; + + imports = [ + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "autoLogin" ] [ "services" "displayManager" "autoLogin" ]) + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "defaultSession" ] [ "services" "displayManager" "defaultSession" ]) + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "environment" ] [ "services" "displayManager" "environment" ]) + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "execCmd" ] [ "services" "displayManager" "execCmd" ]) + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "logToFile" ] [ "services" "displayManager" "logToFile" ]) + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "logToJournal" ] [ "services" "displayManager" "logToJournal" ]) + (lib.mkRenamedOptionModule [ "services" "xserver" "displayManager" "job" "preStart" ] [ "services" "displayManager" "preStart" ]) + ]; + + config = lib.mkIf cfg.enable { + assertions = [ + { assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null; + message = '' + services.displayManager.autoLogin.enable requires services.displayManager.autoLogin.user to be set + ''; + } + ]; + + warnings = + lib.mkIf (dmDefault != null || wmDefault != null) [ + '' + The following options are deprecated: + ${lib.concatStringsSep "\n " (map ({c, t}: t) (lib.filter ({c, t}: c != null) [ + { c = dmDefault; t = "- services.xserver.desktopManager.default"; } + { c = wmDefault; t = "- services.xserver.windowManager.default"; } + ]))} + Please use + services.displayManager.defaultSession = "${defaultSessionFromLegacyOptions}"; + instead. + '' + ]; + + # 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 = lib.mkIf (cfg.sessionPackages != [ ]) [ + "${cfg.sessionData.desktops}/share" + ]; + + services.displayManager.sessionData = { + desktops = installedSessions; + sessionNames = lib.concatMap (p: p.providedSessions) config.services.displayManager.sessionPackages; + # We do not want to force users to set defaultSession when they have only single DE. + autologinSession = + if cfg.defaultSession != null then + cfg.defaultSession + else if cfg.sessionData.sessionNames != [] then + lib.head cfg.sessionData.sessionNames + else + null; + }; + + # so that the service won't be enabled when only startx is used + systemd.services.display-manager.enable = + let dmConf = config.services.xserver.displayManager; + noDmUsed = !(dmConf.gdm.enable + || cfg.sddm.enable + || dmConf.xpra.enable + || dmConf.lightdm.enable); + in lib.mkIf noDmUsed (lib.mkDefault false); + + systemd.services.display-manager = { + description = "Display Manager"; + after = [ "acpid.service" "systemd-logind.service" "systemd-user-sessions.service" ]; + restartIfChanged = false; + + environment = lib.optionalAttrs config.hardware.opengl.setLdLibraryPath { + LD_LIBRARY_PATH = lib.makeLibraryPath [ pkgs.addOpenGLRunpath.driverLink ]; + } // cfg.environment; + + preStart = cfg.preStart; + script = lib.mkIf (config.systemd.services.display-manager.enable == true) cfg.execCmd; + + # Stop restarting if the display manager stops (crashes) 2 times + # in one minute. Starting X typically takes 3-4s. + startLimitIntervalSec = 30; + startLimitBurst = 3; + serviceConfig = { + Restart = "always"; + RestartSec = "200ms"; + SyslogIdentifier = "display-manager"; + }; + }; + }; +} |