288 lines
8.6 KiB
Nix
288 lines
8.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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xcfg = config.services.xserver;
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dmcfg = xcfg.displayManager;
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cfg = dmcfg.sddm;
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xEnv = config.systemd.services.display-manager.environment;
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sddm = pkgs.libsForQt5.sddm;
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iniFmt = pkgs.formats.ini { };
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xserverWrapper = pkgs.writeShellScript "xserver-wrapper" ''
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${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
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exec systemd-cat -t xserver-wrapper ${dmcfg.xserverBin} ${toString dmcfg.xserverArgs} "$@"
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'';
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Xsetup = pkgs.writeShellScript "Xsetup" ''
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${cfg.setupScript}
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${dmcfg.setupCommands}
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'';
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Xstop = pkgs.writeShellScript "Xstop" ''
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${cfg.stopScript}
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'';
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defaultConfig = {
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General = {
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HaltCommand = "/run/current-system/systemd/bin/systemctl poweroff";
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RebootCommand = "/run/current-system/systemd/bin/systemctl reboot";
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Numlock = if cfg.autoNumlock then "on" else "none"; # on, off none
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# Implementation is done via pkgs/applications/display-managers/sddm/sddm-default-session.patch
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DefaultSession = optionalString (dmcfg.defaultSession != null) "${dmcfg.defaultSession}.desktop";
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};
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Theme = {
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Current = cfg.theme;
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ThemeDir = "/run/current-system/sw/share/sddm/themes";
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FacesDir = "/run/current-system/sw/share/sddm/faces";
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};
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Users = {
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MaximumUid = config.ids.uids.nixbld;
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HideUsers = concatStringsSep "," dmcfg.hiddenUsers;
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HideShells = "/run/current-system/sw/bin/nologin";
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};
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X11 = {
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MinimumVT = if xcfg.tty != null then xcfg.tty else 7;
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ServerPath = toString xserverWrapper;
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XephyrPath = "${pkgs.xorg.xorgserver.out}/bin/Xephyr";
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SessionCommand = toString dmcfg.sessionData.wrapper;
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SessionDir = "${dmcfg.sessionData.desktops}/share/xsessions";
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XauthPath = "${pkgs.xorg.xauth}/bin/xauth";
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DisplayCommand = toString Xsetup;
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DisplayStopCommand = toString Xstop;
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EnableHiDPI = cfg.enableHidpi;
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};
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Wayland = {
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EnableHiDPI = cfg.enableHidpi;
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SessionDir = "${dmcfg.sessionData.desktops}/share/wayland-sessions";
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};
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} // lib.optionalAttrs dmcfg.autoLogin.enable {
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Autologin = {
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User = dmcfg.autoLogin.user;
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Session = autoLoginSessionName;
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Relogin = cfg.autoLogin.relogin;
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};
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};
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cfgFile =
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iniFmt.generate "sddm.conf" (lib.recursiveUpdate defaultConfig cfg.settings);
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autoLoginSessionName =
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"${dmcfg.sessionData.autologinSession}.desktop";
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in
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{
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imports = [
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(mkRemovedOptionModule
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[ "services" "xserver" "displayManager" "sddm" "themes" ]
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"Set the option `services.xserver.displayManager.sddm.package' instead.")
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(mkRenamedOptionModule
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[ "services" "xserver" "displayManager" "sddm" "autoLogin" "enable" ]
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[ "services" "xserver" "displayManager" "autoLogin" "enable" ])
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(mkRenamedOptionModule
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[ "services" "xserver" "displayManager" "sddm" "autoLogin" "user" ]
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[ "services" "xserver" "displayManager" "autoLogin" "user" ])
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(mkRemovedOptionModule
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[ "services" "xserver" "displayManager" "sddm" "extraConfig" ]
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"Set the option `services.xserver.displayManager.sddm.settings' instead.")
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];
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options = {
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services.xserver.displayManager.sddm = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable sddm as the display manager.
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'';
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};
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enableHidpi = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether to enable automatic HiDPI mode.
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'';
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};
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settings = mkOption {
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type = iniFmt.type;
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default = { };
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example = {
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Autologin = {
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User = "john";
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Session = "plasma.desktop";
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};
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};
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description = ''
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Extra settings merged in and overwritting defaults in sddm.conf.
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'';
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};
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theme = mkOption {
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type = types.str;
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default = "";
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description = ''
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Greeter theme to use.
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'';
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};
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autoNumlock = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Enable numlock at login.
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'';
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};
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setupScript = mkOption {
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type = types.str;
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default = "";
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example = ''
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# workaround for using NVIDIA Optimus without Bumblebee
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xrandr --setprovideroutputsource modesetting NVIDIA-0
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xrandr --auto
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'';
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description = ''
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A script to execute when starting the display server. DEPRECATED, please
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use <option>services.xserver.displayManager.setupCommands</option>.
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'';
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};
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stopScript = mkOption {
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type = types.str;
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default = "";
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description = ''
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A script to execute when stopping the display server.
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'';
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};
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# Configuration for automatic login specific to SDDM
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autoLogin = {
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relogin = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If true automatic login will kick in again on session exit (logout), otherwise it
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will only log in automatically when the display-manager is started.
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'';
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};
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minimumUid = mkOption {
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type = types.ints.u16;
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default = 1000;
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description = ''
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Minimum user ID for auto-login user.
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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 = mkIf cfg.enable {
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assertions = [
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{
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assertion = xcfg.enable;
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message = ''
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SDDM requires services.xserver.enable to be true
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'';
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}
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{
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assertion = dmcfg.autoLogin.enable -> autoLoginSessionName != null;
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message = ''
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SDDM auto-login requires that services.xserver.displayManager.defaultSession is set.
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'';
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}
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];
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services.xserver.displayManager.job = {
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environment = {
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# Load themes from system environment
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QT_PLUGIN_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtPluginPrefix;
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QML2_IMPORT_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtQmlPrefix;
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};
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execCmd = "exec /run/current-system/sw/bin/sddm";
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};
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security.pam.services = {
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sddm = {
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allowNullPassword = true;
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startSession = true;
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};
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sddm-greeter.text = ''
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auth required pam_succeed_if.so audit quiet_success user = sddm
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auth optional pam_permit.so
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account required pam_succeed_if.so audit quiet_success user = sddm
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account sufficient pam_unix.so
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password required pam_deny.so
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session required pam_succeed_if.so audit quiet_success user = sddm
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session required pam_env.so conffile=/etc/pam/environment readenv=0
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session optional ${pkgs.systemd}/lib/security/pam_systemd.so
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session optional pam_keyinit.so force revoke
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session optional pam_permit.so
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'';
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sddm-autologin.text = ''
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auth requisite pam_nologin.so
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auth required pam_succeed_if.so uid >= ${toString cfg.autoLogin.minimumUid} quiet
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auth required pam_permit.so
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account include sddm
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password include sddm
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session include sddm
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'';
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};
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users.users.sddm = {
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createHome = true;
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home = "/var/lib/sddm";
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group = "sddm";
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uid = config.ids.uids.sddm;
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};
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environment.etc."sddm.conf".source = cfgFile;
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environment.pathsToLink = [
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"/share/sddm"
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];
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users.groups.sddm.gid = config.ids.gids.sddm;
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environment.systemPackages = [ sddm ];
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services.dbus.packages = [ sddm ];
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# To enable user switching, allow sddm to allocate TTYs/displays dynamically.
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services.xserver.tty = null;
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services.xserver.display = null;
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systemd.tmpfiles.rules = [
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# Prior to Qt 5.9.2, there is a QML cache invalidation bug which sometimes
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# strikes new Plasma 5 releases. If the QML cache is not invalidated, SDDM
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# will segfault without explanation. We really tore our hair out for awhile
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# before finding the bug:
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# https://bugreports.qt.io/browse/QTBUG-62302
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# We work around the problem by deleting the QML cache before startup.
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# This was supposedly fixed in Qt 5.9.2 however it has been reported with
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# 5.10 and 5.11 as well. The initial workaround was to delete the directory
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# in the Xsetup script but that doesn't do anything.
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# Instead we use tmpfiles.d to ensure it gets wiped.
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# This causes a small but perceptible delay when SDDM starts.
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"e ${config.users.users.sddm.home}/.cache - - - 0"
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];
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};
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}
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