nixos-config/pkgs/co2_exporter/module.nix

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# SPDX-FileCopyrightText: 2022-2023 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later
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{ config, lib, pkgs, ... }:
let
cfg = config.services.co2_exporter;
in
{
options.services.co2_exporter = {
enable = lib.mkEnableOption "co2 exporter";
package = lib.mkOption {
type = lib.types.package;
default = pkgs.co2_exporter;
description = "The package to use for the exporter.";
};
device = lib.mkOption {
type = lib.types.nullOr lib.types.path;
default = null;
description = "The path to the co2 monitor device.";
};
listenAddress = lib.mkOption {
type = lib.types.str;
default = ":8080";
description = "The address to listen on";
example = "127.0.0.1:8080";
};
};
config = lib.mkIf cfg.enable {
systemd.services.co2_exporter = {
wantedBy = [ "multi-user.target" ];
after = [ "network.target" ];
environment = {
CO2MONITOR_ADDRESS = cfg.listenAddress;
} // (lib.optionalAttrs (!isNull cfg.device) {
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CO2MONITOR_DEVICE = cfg.device;
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});
serviceConfig = {
ExecStart = "${cfg.package}/bin/co2_exporter";
Restart = "always";
# systemd-analyze --no-pager security co2_exporter.service
DynamicUser = true;
CapabilityBoundingSet = null;
PrivateUsers = true;
ProtectHome = true;
RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
RestrictNamespaces = true;
SystemCallFilter = "@system-service";
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};
};
};
}