nixpkgs/nixos/modules/services/x11/display-managers/sddm.nix

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{ config, lib, pkgs, ... }:
with lib;
let
xcfg = config.services.xserver;
dmcfg = xcfg.displayManager;
cfg = dmcfg.sddm;
xEnv = config.systemd.services."display-manager".environment;
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sddm = pkgs.sddm.override { inherit (cfg) themes; };
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xserverWrapper = pkgs.writeScript "xserver-wrapper" ''
#!/bin/sh
${concatMapStrings (n: "export ${n}=\"${getAttr n xEnv}\"\n") (attrNames xEnv)}
exec ${dmcfg.xserverBin} ${dmcfg.xserverArgs} "$@"
'';
Xsetup = pkgs.writeScript "Xsetup" ''
#!/bin/sh
${cfg.setupScript}
'';
Xstop = pkgs.writeScript "Xstop" ''
#!/bin/sh
${cfg.stopScript}
'';
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cfgFile = pkgs.writeText "sddm.conf" ''
[General]
HaltCommand=${pkgs.systemd}/bin/systemctl poweroff
RebootCommand=${pkgs.systemd}/bin/systemctl reboot
${optionalString cfg.autoNumlock ''
Numlock=on
''}
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[Theme]
Current=${cfg.theme}
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ThemeDir=${sddm}/share/sddm/themes
FacesDir=${sddm}/share/sddm/faces
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[Users]
MaximumUid=${toString config.ids.uids.nixbld}
HideUsers=${concatStringsSep "," dmcfg.hiddenUsers}
HideShells=/run/current-system/sw/bin/nologin
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[XDisplay]
MinimumVT=${toString xcfg.tty}
ServerPath=${xserverWrapper}
XephyrPath=${pkgs.xorg.xorgserver.out}/bin/Xephyr
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SessionCommand=${dmcfg.session.script}
SessionDir=${dmcfg.session.desktops}
XauthPath=${pkgs.xorg.xauth}/bin/xauth
DisplayCommand=${Xsetup}
DisplayStopCommand=${Xstop}
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${optionalString cfg.autoLogin.enable ''
[Autologin]
User=${cfg.autoLogin.user}
Session=${defaultSessionName}.desktop
Relogin=${if cfg.autoLogin.relogin then "true" else "false"}
''}
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${cfg.extraConfig}
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'';
defaultSessionName =
let
dm = xcfg.desktopManager.default;
wm = xcfg.windowManager.default;
in dm + optionalString (wm != "none") (" + " + wm);
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in
{
options = {
services.xserver.displayManager.sddm = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable sddm as the display manager.
'';
};
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extraConfig = mkOption {
type = types.str;
default = "";
example = ''
[Autologin]
User=john
Session=plasma.desktop
'';
description = ''
Extra lines appended to the configuration of SDDM.
'';
};
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theme = mkOption {
type = types.str;
default = "maui";
description = ''
Greeter theme to use.
'';
};
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themes = mkOption {
type = types.listOf types.package;
default = [];
description = ''
Extra packages providing themes.
'';
};
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.
'';
};
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 {
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options = {
enable = mkOption {
type = types.bool;
default = false;
description = ''
Automatically log in as the sepecified <option>autoLogin.user</option>.
'';
};
user = mkOption {
type = types.nullOr types.str;
default = null;
description = ''
User to be used for the autologin.
'';
};
relogin = mkOption {
type = types.bool;
default = false;
description = ''
If true automatic login will kick in again on session exit, otherwise it
will work only the first time.
'';
};
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};
};
};
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};
};
config = mkIf cfg.enable {
assertions = [
{ assertion = cfg.autoLogin.enable -> cfg.autoLogin.user != null;
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message = ''
SDDM auto-login requires services.xserver.displayManager.sddm.autoLogin.user to be set
'';
}
{ assertion = cfg.autoLogin.enable -> elem defaultSessionName dmcfg.session.names;
message = ''
SDDM auto-login requires that services.xserver.desktopManager.default and
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services.xserver.windowMananger.default are set to valid values. The current
default session: ${defaultSessionName} is not valid.
'';
}
];
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services.xserver.displayManager.slim.enable = false;
services.xserver.displayManager.job = {
logsXsession = true;
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execCmd = "exec ${sddm}/bin/sddm";
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};
security.pam.services = {
sddm = {
allowNullPassword = true;
startSession = true;
};
sddm-greeter.text = ''
auth required pam_succeed_if.so audit quiet_success user = sddm
auth optional pam_permit.so
account required pam_succeed_if.so audit quiet_success user = sddm
account sufficient pam_unix.so
password required pam_deny.so
session required pam_succeed_if.so audit quiet_success user = sddm
session required pam_env.so envfile=${config.system.build.pamEnvironment}
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
'';
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};
users.extraUsers.sddm = {
createHome = true;
home = "/var/lib/sddm";
group = "sddm";
uid = config.ids.uids.sddm;
};
environment.etc."sddm.conf".source = cfgFile;
users.extraGroups.sddm.gid = config.ids.gids.sddm;
};
}