145 lines
4.3 KiB
Nix
145 lines
4.3 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.home-assistant;
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configFile = pkgs.writeText "configuration.yaml" (builtins.toJSON cfg.config);
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availableComponents = pkgs.home-assistant.availableComponents;
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# Given component "parentConfig.platform", returns whether config.parentConfig
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# is a list containing a set with set.platform == "platform".
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#
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# For example, the component sensor.luftdaten is used as follows:
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# config.sensor = [ {
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# platform = "luftdaten";
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# ...
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# } ];
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useComponentPlatform = component:
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let
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path = splitString "." component;
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parentConfig = attrByPath (init path) null cfg.config;
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platform = last path;
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in isList parentConfig && any
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(item: item.platform or null == platform)
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parentConfig;
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# Returns whether component is used in config
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useComponent = component:
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hasAttrByPath (splitString "." component) cfg.config
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|| useComponentPlatform component;
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# List of components used in config
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extraComponents = filter useComponent availableComponents;
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package = if cfg.autoExtraComponents
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then (cfg.package.override { inherit extraComponents; })
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else cfg.package;
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in {
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meta.maintainers = with maintainers; [ dotlambda ];
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options.services.home-assistant = {
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enable = mkEnableOption "Home Assistant";
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configDir = mkOption {
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default = "/var/lib/hass";
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type = types.path;
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description = "The config directory, where your <filename>configuration.yaml</filename> is located.";
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};
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config = mkOption {
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default = null;
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type = with types; nullOr attrs;
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example = literalExample ''
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{
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homeassistant = {
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name = "Home";
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time_zone = "UTC";
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};
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frontend = { };
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http = { };
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feedreader.urls = [ "https://nixos.org/blogs.xml" ];
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}
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'';
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description = ''
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Your <filename>configuration.yaml</filename> as a Nix attribute set.
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Beware that setting this option will delete your previous <filename>configuration.yaml</filename>.
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'';
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};
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package = mkOption {
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default = pkgs.home-assistant;
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defaultText = "pkgs.home-assistant";
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type = types.package;
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example = literalExample ''
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pkgs.home-assistant.override {
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extraPackages = ps: with ps; [ colorlog ];
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}
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'';
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description = ''
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Home Assistant package to use.
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Override <literal>extraPackages</literal> in order to add additional dependencies.
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'';
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};
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autoExtraComponents = mkOption {
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default = true;
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type = types.bool;
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description = ''
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If set to <literal>true</literal>, the components used in <literal>config</literal>
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are set as the specified package's <literal>extraComponents</literal>.
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This in turn adds all packaged dependencies to the derivation.
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You might still see import errors in your log.
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In this case, you will need to package the necessary dependencies yourself
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or ask for someone else to package them.
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If a dependency is packaged but not automatically added to this list,
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you might need to specify it in <literal>extraPackages</literal>.
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'';
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};
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};
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config = mkIf cfg.enable {
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systemd.services.home-assistant = {
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description = "Home Assistant";
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after = [ "network.target" ];
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preStart = lib.optionalString (cfg.config != null) ''
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rm -f ${cfg.configDir}/configuration.yaml
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ln -s ${configFile} ${cfg.configDir}/configuration.yaml
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'';
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serviceConfig = {
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ExecStart = ''
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${package}/bin/hass --config "${cfg.configDir}"
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'';
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User = "hass";
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Group = "hass";
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Restart = "on-failure";
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ProtectSystem = "strict";
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ReadWritePaths = "${cfg.configDir}";
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PrivateTmp = true;
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};
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path = [
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"/run/wrappers" # needed for ping
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];
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};
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systemd.targets.home-assistant = rec {
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description = "Home Assistant";
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wantedBy = [ "multi-user.target" ];
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wants = [ "home-assistant.service" ];
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after = wants;
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};
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users.extraUsers.hass = {
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home = cfg.configDir;
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createHome = true;
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group = "hass";
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uid = config.ids.uids.hass;
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};
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users.extraGroups.hass.gid = config.ids.gids.hass;
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};
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}
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