{ config, pkgs, lib, ... }: with lib; let cfg = config.services.collectd; baseDirLine = ''BaseDir "${cfg.dataDir}"''; unvalidated_conf = pkgs.writeText "collectd-unvalidated.conf" cfg.extraConfig; conf = if cfg.validateConfig then pkgs.runCommand "collectd.conf" {} '' echo testing ${unvalidated_conf} cp ${unvalidated_conf} collectd.conf # collectd -t fails if BaseDir does not exist. substituteInPlace collectd.conf --replace ${lib.escapeShellArgs [ baseDirLine ]} 'BaseDir "."' ${package}/bin/collectd -t -C collectd.conf cp ${unvalidated_conf} $out '' else unvalidated_conf; package = if cfg.buildMinimalPackage then minimalPackage else cfg.package; minimalPackage = cfg.package.override { enabledPlugins = [ "syslog" ] ++ builtins.attrNames cfg.plugins; }; in { options.services.collectd = with types; { enable = mkEnableOption (lib.mdDoc "collectd agent"); validateConfig = mkOption { default = true; description = lib.mdDoc '' Validate the syntax of collectd configuration file at build time. Disable this if you use the Include directive on files unavailable in the build sandbox, or when cross-compiling. ''; type = types.bool; }; package = mkOption { default = pkgs.collectd; defaultText = literalExpression "pkgs.collectd"; description = lib.mdDoc '' Which collectd package to use. ''; type = types.package; }; buildMinimalPackage = mkOption { default = false; description = lib.mdDoc '' Build a minimal collectd package with only the configured `services.collectd.plugins` ''; type = bool; }; user = mkOption { default = "collectd"; description = lib.mdDoc '' User under which to run collectd. ''; type = nullOr str; }; dataDir = mkOption { default = "/var/lib/collectd"; description = lib.mdDoc '' Data directory for collectd agent. ''; type = path; }; autoLoadPlugin = mkOption { default = false; description = lib.mdDoc '' Enable plugin autoloading. ''; type = bool; }; include = mkOption { default = []; description = lib.mdDoc '' Additional paths to load config from. ''; type = listOf str; }; plugins = mkOption { default = {}; example = { cpu = ""; memory = ""; network = "Server 192.168.1.1 25826"; }; description = lib.mdDoc '' Attribute set of plugin names to plugin config segments ''; type = attrsOf lines; }; extraConfig = mkOption { default = ""; description = lib.mdDoc '' Extra configuration for collectd. Use mkBefore to add lines before the default config, and mkAfter to add them below. ''; type = lines; }; }; config = mkIf cfg.enable { # 1200 is after the default (1000) but before mkAfter (1500). services.collectd.extraConfig = lib.mkOrder 1200 '' ${baseDirLine} AutoLoadPlugin ${boolToString cfg.autoLoadPlugin} Hostname "${config.networking.hostName}" LoadPlugin syslog LogLevel "info" NotifyLevel "OKAY" ${concatStrings (mapAttrsToList (plugin: pluginConfig: '' LoadPlugin ${plugin} ${pluginConfig} '') cfg.plugins)} ${concatMapStrings (f: '' Include "${f}" '') cfg.include} ''; systemd.tmpfiles.rules = [ "d '${cfg.dataDir}' - ${cfg.user} - - -" ]; systemd.services.collectd = { description = "Collectd Monitoring Agent"; after = [ "network.target" ]; wantedBy = [ "multi-user.target" ]; serviceConfig = { ExecStart = "${package}/sbin/collectd -C ${conf} -f"; User = cfg.user; Restart = "on-failure"; RestartSec = 3; }; }; users.users = optionalAttrs (cfg.user == "collectd") { collectd = { isSystemUser = true; group = "collectd"; }; }; users.groups = optionalAttrs (cfg.user == "collectd") { collectd = {}; }; }; }