129 lines
3.4 KiB
Nix
129 lines
3.4 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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inherit (lib) escapeShellArgs mkEnableOption mkIf mkOption types;
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cfg = config.services.loki;
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prettyJSON = conf:
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pkgs.runCommand "loki-config.json" { } ''
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echo '${builtins.toJSON conf}' | ${pkgs.jq}/bin/jq 'del(._module)' > $out
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'';
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in {
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options.services.loki = {
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enable = mkEnableOption "loki";
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user = mkOption {
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type = types.str;
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default = "loki";
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description = ''
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User under which the Loki service runs.
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'';
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};
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package = lib.mkPackageOption pkgs "grafana-loki" { };
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group = mkOption {
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type = types.str;
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default = "loki";
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description = ''
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Group under which the Loki service runs.
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'';
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};
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dataDir = mkOption {
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type = types.path;
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default = "/var/lib/loki";
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description = ''
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Specify the directory for Loki.
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'';
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};
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configuration = mkOption {
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type = (pkgs.formats.json {}).type;
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default = {};
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description = ''
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Specify the configuration for Loki in Nix.
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'';
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};
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configFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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description = ''
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Specify a configuration file that Loki should use.
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'';
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};
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extraFlags = mkOption {
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type = types.listOf types.str;
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default = [];
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example = [ "--server.http-listen-port=3101" ];
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description = ''
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Specify a list of additional command line flags,
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which get escaped and are then passed to Loki.
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'';
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};
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};
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config = mkIf cfg.enable {
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assertions = [{
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assertion = (
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(cfg.configuration == {} -> cfg.configFile != null) &&
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(cfg.configFile != null -> cfg.configuration == {})
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);
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message = ''
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Please specify either
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'services.loki.configuration' or
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'services.loki.configFile'.
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'';
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}];
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environment.systemPackages = [ cfg.package ]; # logcli
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users.groups.${cfg.group} = { };
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users.users.${cfg.user} = {
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description = "Loki Service User";
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group = cfg.group;
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home = cfg.dataDir;
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createHome = true;
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isSystemUser = true;
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};
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systemd.services.loki = {
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description = "Loki Service Daemon";
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig = let
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conf = if cfg.configFile == null
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then
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# Config validation may fail when using extraFlags = [ "-config.expand-env=true" ].
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# To work around this, we simply skip it when extraFlags is not empty.
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if cfg.extraFlags == []
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then validateConfig (prettyJSON cfg.configuration)
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else prettyJSON cfg.configuration
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else cfg.configFile;
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validateConfig = file:
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pkgs.runCommand "validate-loki-conf" {
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nativeBuildInputs = [ cfg.package ];
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} ''
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loki -verify-config -config.file "${file}"
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ln -s "${file}" "$out"
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'';
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in
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{
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ExecStart = "${cfg.package}/bin/loki --config.file=${conf} ${escapeShellArgs cfg.extraFlags}";
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User = cfg.user;
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Restart = "always";
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PrivateTmp = true;
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ProtectHome = true;
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ProtectSystem = "full";
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DevicePolicy = "closed";
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NoNewPrivileges = true;
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WorkingDirectory = cfg.dataDir;
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};
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};
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};
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}
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