nixpkgs/nixos/modules/services/x11/display-managers/sddm.nix
Jan Tojnar 8dc5ff7dcf
nixos/displayManager: deprecate separate options for default wm/dm
The upstream session files display managers use have no concept of sessions being composed from
desktop manager and window manager. To be able to set upstream session files as default
session, we need a single option. Having two different ways to set default session would be confusing,
though, so we decided to deprecate the old method.

We also created separate script for each session, just like we already had a separate desktop
file for each one, and started using displayManager.sessionPackages mechanism to make the
session handling more uniform.
2019-12-15 04:16:20 +01:00

298 lines
8.4 KiB
Nix

{ config, lib, pkgs, ... }:
with lib;
let
xcfg = config.services.xserver;
dmcfg = xcfg.displayManager;
cfg = dmcfg.sddm;
xEnv = config.systemd.services.display-manager.environment;
inherit (pkgs) sddm;
xserverWrapper = pkgs.writeScript "xserver-wrapper" ''
#!/bin/sh
${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
exec systemd-cat -t xserver-wrapper ${dmcfg.xserverBin} ${toString dmcfg.xserverArgs} "$@"
'';
Xsetup = pkgs.writeScript "Xsetup" ''
#!/bin/sh
${cfg.setupScript}
${dmcfg.setupCommands}
'';
Xstop = pkgs.writeScript "Xstop" ''
#!/bin/sh
${cfg.stopScript}
'';
cfgFile = pkgs.writeText "sddm.conf" ''
[General]
HaltCommand=${pkgs.systemd}/bin/systemctl poweroff
RebootCommand=${pkgs.systemd}/bin/systemctl reboot
${optionalString cfg.autoNumlock ''
Numlock=on
''}
[Theme]
Current=${cfg.theme}
ThemeDir=/run/current-system/sw/share/sddm/themes
FacesDir=/run/current-system/sw/share/sddm/faces
[Users]
MaximumUid=${toString config.ids.uids.nixbld}
HideUsers=${concatStringsSep "," dmcfg.hiddenUsers}
HideShells=/run/current-system/sw/bin/nologin
[X11]
MinimumVT=${toString (if xcfg.tty != null then xcfg.tty else 7)}
ServerPath=${xserverWrapper}
XephyrPath=${pkgs.xorg.xorgserver.out}/bin/Xephyr
SessionCommand=${dmcfg.sessionData.wrapper}
SessionDir=${dmcfg.sessionData.desktops}/share/xsessions
XauthPath=${pkgs.xorg.xauth}/bin/xauth
DisplayCommand=${Xsetup}
DisplayStopCommand=${Xstop}
EnableHidpi=${if cfg.enableHidpi then "true" else "false"}
[Wayland]
EnableHidpi=${if cfg.enableHidpi then "true" else "false"}
SessionDir=${dmcfg.sessionData.desktops}/share/wayland-sessions
${optionalString cfg.autoLogin.enable ''
[Autologin]
User=${cfg.autoLogin.user}
Session=${autoLoginSessionName}.desktop
Relogin=${boolToString cfg.autoLogin.relogin}
''}
${cfg.extraConfig}
'';
autoLoginSessionName = dmcfg.sessionData.autologinSession;
in
{
imports = [
(mkRemovedOptionModule [ "services" "xserver" "displayManager" "sddm" "themes" ]
"Set the option `services.xserver.displayManager.sddm.package' instead.")
];
options = {
services.xserver.displayManager.sddm = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable sddm as the display manager.
'';
};
enableHidpi = mkOption {
type = types.bool;
default = true;
description = ''
Whether to enable automatic HiDPI mode.
</para>
<para>
Versions up to 0.17 are broken so this only works from 0.18 onwards.
'';
};
extraConfig = mkOption {
type = types.lines;
default = "";
example = ''
[Autologin]
User=john
Session=plasma.desktop
'';
description = ''
Extra lines appended to the configuration of SDDM.
'';
};
theme = mkOption {
type = types.str;
default = "";
description = ''
Greeter theme to use.
'';
};
autoNumlock = mkOption {
type = types.bool;
default = false;
description = ''
Enable numlock at login.
'';
};
setupScript = mkOption {
type = types.str;
default = "";
example = ''
# workaround for using NVIDIA Optimus without Bumblebee
xrandr --setprovideroutputsource modesetting NVIDIA-0
xrandr --auto
'';
description = ''
A script to execute when starting the display server. DEPRECATED, please
use <option>services.xserver.displayManager.setupCommands</option>.
'';
};
stopScript = mkOption {
type = types.str;
default = "";
description = ''
A script to execute when stopping the display server.
'';
};
autoLogin = mkOption {
default = {};
description = ''
Configuration for automatic login.
'';
type = types.submodule {
options = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Automatically log in as <option>autoLogin.user</option>.
'';
};
user = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
User to be used for the automatic login.
'';
};
relogin = mkOption {
type = types.bool;
default = false;
description = ''
If true automatic login will kick in again on session exit (logout), otherwise it
will only log in automatically when the display-manager is started.
'';
};
};
};
};
};
};
config = mkIf cfg.enable {
assertions = [
{ assertion = xcfg.enable;
message = ''
SDDM requires services.xserver.enable to be true
'';
}
{ assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null;
message = ''
SDDM auto-login requires services.xserver.displayManager.sddm.autoLogin.user to be set
'';
}
{ assertion = cfg.autoLogin.enable -> autoLoginSessionName != null;
message = ''
SDDM auto-login requires that services.xserver.displayManager.defaultSession is set.
'';
}
];
services.xserver.displayManager.job = {
environment = {
# Load themes from system environment
QT_PLUGIN_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtPluginPrefix;
QML2_IMPORT_PATH = "/run/current-system/sw/" + pkgs.qt5.qtbase.qtQmlPrefix;
};
execCmd = "exec /run/current-system/sw/bin/sddm";
};
security.pam.services = {
sddm = {
allowNullPassword = true;
startSession = true;
};
sddm-greeter.text = ''
auth required pam_succeed_if.so audit quiet_success user = sddm
auth optional pam_permit.so
account required pam_succeed_if.so audit quiet_success user = sddm
account sufficient pam_unix.so
password required pam_deny.so
session required pam_succeed_if.so audit quiet_success user = sddm
session required pam_env.so conffile=${config.system.build.pamEnvironment} readenv=0
session optional ${pkgs.systemd}/lib/security/pam_systemd.so
session optional pam_keyinit.so force revoke
session optional pam_permit.so
'';
sddm-autologin.text = ''
auth requisite pam_nologin.so
auth required pam_succeed_if.so uid >= 1000 quiet
auth required pam_permit.so
account include sddm
password include sddm
session include sddm
'';
};
users.users.sddm = {
createHome = true;
home = "/var/lib/sddm";
group = "sddm";
uid = config.ids.uids.sddm;
};
environment.etc."sddm.conf".source = cfgFile;
environment.pathsToLink = [
"/share/sddm"
];
users.groups.sddm.gid = config.ids.gids.sddm;
environment.systemPackages = [ sddm ];
services.dbus.packages = [ sddm ];
# To enable user switching, allow sddm to allocate TTYs/displays dynamically.
services.xserver.tty = null;
services.xserver.display = null;
systemd.tmpfiles.rules = [
# Prior to Qt 5.9.2, there is a QML cache invalidation bug which sometimes
# strikes new Plasma 5 releases. If the QML cache is not invalidated, SDDM
# will segfault without explanation. We really tore our hair out for awhile
# before finding the bug:
# https://bugreports.qt.io/browse/QTBUG-62302
# We work around the problem by deleting the QML cache before startup.
# This was supposedly fixed in Qt 5.9.2 however it has been reported with
# 5.10 and 5.11 as well. The initial workaround was to delete the directory
# in the Xsetup script but that doesn't do anything.
# Instead we use tmpfiles.d to ensure it gets wiped.
# This causes a small but perceptible delay when SDDM starts.
"e ${config.users.users.sddm.home}/.cache - - - 0"
];
};
}