nixpkgs/nixos/modules/services/logging/syslogd.nix
2024-08-30 00:30:57 +02:00

128 lines
3.1 KiB
Nix

{ config, lib, pkgs, ... }:
let
cfg = config.services.syslogd;
syslogConf = pkgs.writeText "syslog.conf" ''
${lib.optionalString (cfg.tty != "") "kern.warning;*.err;authpriv.none /dev/${cfg.tty}"}
${cfg.defaultConfig}
${cfg.extraConfig}
'';
defaultConf = ''
# Send emergency messages to all users.
*.emerg *
# "local1" is used for dhcpd messages.
local1.* -/var/log/dhcpd
mail.* -/var/log/mail
*.=warning;*.=err -/var/log/warn
*.crit /var/log/warn
*.*;mail.none;local1.none -/var/log/messages
'';
in
{
###### interface
options = {
services.syslogd = {
enable = lib.mkOption {
type = lib.types.bool;
default = false;
description = ''
Whether to enable syslogd. Note that systemd also logs
syslog messages, so you normally don't need to run syslogd.
'';
};
tty = lib.mkOption {
type = lib.types.str;
default = "tty10";
description = ''
The tty device on which syslogd will print important log
messages. Leave this option blank to disable tty logging.
'';
};
defaultConfig = lib.mkOption {
type = lib.types.lines;
default = defaultConf;
description = ''
The default {file}`syslog.conf` file configures a
fairly standard setup of log files, which can be extended by
means of {var}`extraConfig`.
'';
};
enableNetworkInput = lib.mkOption {
type = lib.types.bool;
default = false;
description = ''
Accept logging through UDP. Option -r of syslogd(8).
'';
};
extraConfig = lib.mkOption {
type = lib.types.lines;
default = "";
example = "news.* -/var/log/news";
description = ''
Additional text appended to {file}`syslog.conf`,
i.e. the contents of {var}`defaultConfig`.
'';
};
extraParams = lib.mkOption {
type = lib.types.listOf lib.types.str;
default = [ ];
example = [ "-m 0" ];
description = ''
Additional parameters passed to {command}`syslogd`.
'';
};
};
};
###### implementation
config = lib.mkIf cfg.enable {
assertions =
[ { assertion = !config.services.rsyslogd.enable;
message = "rsyslogd conflicts with syslogd";
}
];
environment.systemPackages = [ pkgs.sysklogd ];
services.syslogd.extraParams = lib.optional cfg.enableNetworkInput "-r";
# FIXME: restarting syslog seems to break journal logging.
systemd.services.syslog =
{ description = "Syslog Daemon";
requires = [ "syslog.socket" ];
wantedBy = [ "multi-user.target" ];
serviceConfig =
{ ExecStart = "${pkgs.sysklogd}/sbin/syslogd ${toString cfg.extraParams} -f ${syslogConf} -n";
# Prevent syslogd output looping back through journald.
StandardOutput = "null";
};
};
};
}