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nixpkgs/nixos/modules/services/networking/oidentd.nix

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{ config, lib, pkgs, ... }:
with lib;
{
###### interface
options = {
services.oidentd.enable = mkOption {
default = false;
type = types.bool;
description = ''
Whether to enable oidentd, an implementation of the Ident
protocol (RFC 1413). It allows remote systems to identify the
name of the user associated with a TCP connection.
'';
};
};
###### implementation
config = mkIf config.services.oidentd.enable {
systemd.services.oidentd = {
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
serviceConfig.Type = "forking";
script = "${pkgs.oidentd}/sbin/oidentd -u oidentd -g nogroup" +
optionalString config.networking.enableIPv6 " -a ::";
};
users.extraUsers.oidentd = {
description = "Ident Protocol daemon user";
group = "oidentd";
uid = config.ids.uids.oidentd;
};
users.extraGroups.oidentd.gid = config.ids.gids.oidentd;
};
}