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nixpkgs/nixos/modules/services/display-managers/greetd.nix

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Nix

{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.greetd;
tty = "tty${toString cfg.vt}";
settingsFormat = pkgs.formats.toml {};
in
{
options.services.greetd = {
enable = mkEnableOption (lib.mdDoc "greetd");
package = mkOption {
type = types.package;
default = pkgs.greetd.greetd;
defaultText = literalExpression "pkgs.greetd.greetd";
description = lib.mdDoc "The greetd package that should be used.";
};
settings = mkOption {
type = settingsFormat.type;
example = literalExpression ''
{
default_session = {
command = "''${pkgs.greetd.greetd}/bin/agreety --cmd sway";
};
}
'';
description = lib.mdDoc ''
greetd configuration ([documentation](https://man.sr.ht/~kennylevinsen/greetd/))
as a Nix attribute set.
'';
};
vt = mkOption {
type = types.int;
default = 1;
description = lib.mdDoc ''
The virtual console (tty) that greetd should use. This option also disables getty on that tty.
'';
};
restart = mkOption {
type = types.bool;
default = !(cfg.settings ? initial_session);
defaultText = literalExpression "!(config.services.greetd.settings ? initial_session)";
description = lib.mdDoc ''
Whether to restart greetd when it terminates (e.g. on failure).
This is usually desirable so a user can always log in, but should be disabled when using 'settings.initial_session' (autologin),
because every greetd restart will trigger the autologin again.
'';
};
};
config = mkIf cfg.enable {
services.greetd.settings.terminal.vt = mkDefault cfg.vt;
services.greetd.settings.default_session.user = mkDefault "greeter";
security.pam.services.greetd = {
allowNullPassword = true;
startSession = true;
};
# This prevents nixos-rebuild from killing greetd by activating getty again
systemd.services."autovt@${tty}".enable = false;
systemd.services.greetd = {
unitConfig = {
Wants = [
"systemd-user-sessions.service"
];
After = [
"systemd-user-sessions.service"
"plymouth-quit-wait.service"
"getty@${tty}.service"
];
Conflicts = [
"getty@${tty}.service"
];
};
serviceConfig = {
ExecStart = "${pkgs.greetd.greetd}/bin/greetd --config ${settingsFormat.generate "greetd.toml" cfg.settings}";
Restart = mkIf cfg.restart "always";
# Defaults from greetd upstream configuration
IgnoreSIGPIPE = false;
SendSIGHUP = true;
TimeoutStopSec = "30s";
KeyringMode = "shared";
Type = "idle";
};
# Don't kill a user session when using nixos-rebuild
restartIfChanged = false;
wantedBy = [ "graphical.target" ];
};
systemd.defaultUnit = "graphical.target";
users.users.greeter = {
isSystemUser = true;
group = "greeter";
};
users.groups.greeter = {};
};
meta.maintainers = with maintainers; [ queezle ];
}