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nixpkgs/nixos/modules/services/home-automation/home-assistant.nix

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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.home-assistant;
format = pkgs.formats.yaml {};
# Render config attribute sets to YAML
# Values that are null will be filtered from the output, so this is one way to have optional
# options shown in settings.
# We post-process the result to add support for YAML functions, like secrets or includes, see e.g.
# https://www.home-assistant.io/docs/configuration/secrets/
filteredConfig = lib.converge (lib.filterAttrsRecursive (_: v: ! elem v [ null ])) cfg.config or {};
configFile = pkgs.runCommand "configuration.yaml" { preferLocalBuild = true; } ''
cp ${format.generate "configuration.yaml" filteredConfig} $out
sed -i -e "s/'\!\([a-z_]\+\) \(.*\)'/\!\1 \2/;s/^\!\!/\!/;" $out
'';
lovelaceConfig = cfg.lovelaceConfig or {};
lovelaceConfigFile = format.generate "ui-lovelace.yaml" lovelaceConfig;
# Components advertised by the home-assistant package
availableComponents = cfg.package.availableComponents;
# Components that were added by overriding the package
explicitComponents = cfg.package.extraComponents;
useExplicitComponent = component: elem component explicitComponents;
# Given a component "platform", looks up whether it is used in the config
# as `platform = "platform";`.
#
# For example, the component mqtt.sensor is used as follows:
# config.sensor = [ {
# platform = "mqtt";
# ...
# } ];
usedPlatforms = config:
if isAttrs config then
optional (config ? platform) config.platform
++ concatMap usedPlatforms (attrValues config)
else if isList config then
concatMap usedPlatforms config
else [ ];
useComponentPlatform = component: elem component (usedPlatforms cfg.config);
# Returns whether component is used in config, explicitly passed into package or
# configured in the module.
useComponent = component:
hasAttrByPath (splitString "." component) cfg.config
|| useComponentPlatform component
|| useExplicitComponent component
|| builtins.elem component cfg.extraComponents;
# Final list of components passed into the package to include required dependencies
extraComponents = filter useComponent availableComponents;
package = (cfg.package.override (oldArgs: {
# Respect overrides that already exist in the passed package and
# concat it with values passed via the module.
extraComponents = oldArgs.extraComponents or [] ++ extraComponents;
extraPackages = ps: (oldArgs.extraPackages or (_: []) ps) ++ (cfg.extraPackages ps);
}));
in {
imports = [
# Migrations in NixOS 22.05
(mkRemovedOptionModule [ "services" "home-assistant" "applyDefaultConfig" ] "The default config was migrated into services.home-assistant.config")
(mkRemovedOptionModule [ "services" "home-assistant" "autoExtraComponents" ] "Components are now parsed from services.home-assistant.config unconditionally")
(mkRenamedOptionModule [ "services" "home-assistant" "port" ] [ "services" "home-assistant" "config" "http" "server_port" ])
];
meta = {
buildDocsInSandbox = false;
maintainers = teams.home-assistant.members;
};
options.services.home-assistant = {
# Running home-assistant on NixOS is considered an installation method that is unsupported by the upstream project.
# https://github.com/home-assistant/architecture/blob/master/adr/0012-define-supported-installation-method.md#decision
enable = mkEnableOption "Home Assistant. Please note that this installation method is unsupported upstream";
configDir = mkOption {
default = "/var/lib/hass";
type = types.path;
description = "The config directory, where your <filename>configuration.yaml</filename> is located.";
};
extraComponents = mkOption {
type = types.listOf (types.enum availableComponents);
default = [
# List of components required to complete the onboarding
"default_config"
"met"
"esphome"
] ++ optionals (pkgs.stdenv.hostPlatform.isAarch32 || pkgs.stdenv.hostPlatform.isAarch64) [
# Use the platform as an indicator that we might be running on a RaspberryPi and include
# relevant components
"rpi_power"
];
example = literalExpression ''
[
"analytics"
"default_config"
"esphome"
"my"
"shopping_list"
"wled"
]
'';
description = ''
List of <link xlink:href="https://www.home-assistant.io/integrations/">components</link> that have their dependencies included in the package.
The component name can be found in the URL, for example <literal>https://www.home-assistant.io/integrations/ffmpeg/</literal> would map to <literal>ffmpeg</literal>.
'';
};
extraPackages = mkOption {
type = types.functionTo (types.listOf types.package);
default = _: [];
defaultText = literalExpression ''
python3Packages: with python3Packages; [];
'';
example = literalExpression ''
python3Packages: with python3Packages; [
# postgresql support
psycopg2
];
'';
description = ''
List of packages to add to propagatedBuildInputs.
A popular example is <package>python3Packages.psycopg2</package>
for PostgreSQL support in the recorder component.
'';
};
config = mkOption {
type = types.nullOr (types.submodule {
freeformType = format.type;
options = {
# This is a partial selection of the most common options, so new users can quickly
# pick up how to match home-assistants config structure to ours. It also lets us preset
# config values intelligently.
homeassistant = {
# https://www.home-assistant.io/docs/configuration/basic/
name = mkOption {
type = types.nullOr types.str;
default = null;
example = "Home";
description = ''
Name of the location where Home Assistant is running.
'';
};
latitude = mkOption {
type = types.nullOr (types.either types.float types.str);
default = null;
example = 52.3;
description = ''
Latitude of your location required to calculate the time the sun rises and sets.
'';
};
longitude = mkOption {
type = types.nullOr (types.either types.float types.str);
default = null;
example = 4.9;
description = ''
Longitude of your location required to calculate the time the sun rises and sets.
'';
};
unit_system = mkOption {
type = types.nullOr (types.enum [ "metric" "imperial" ]);
default = null;
example = "metric";
description = ''
The unit system to use. This also sets temperature_unit, Celsius for Metric and Fahrenheit for Imperial.
'';
};
temperature_unit = mkOption {
type = types.nullOr (types.enum [ "C" "F" ]);
default = null;
example = "C";
description = ''
Override temperature unit set by unit_system. <literal>C</literal> for Celsius, <literal>F</literal> for Fahrenheit.
'';
};
time_zone = mkOption {
type = types.nullOr types.str;
default = config.time.timeZone or null;
defaultText = literalExpression ''
config.time.timeZone or null
'';
example = "Europe/Amsterdam";
description = ''
Pick your time zone from the column TZ of Wikipedias <link xlink:href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones">list of tz database time zones</link>.
'';
};
};
http = {
# https://www.home-assistant.io/integrations/http/
server_host = mkOption {
type = types.either types.str (types.listOf types.str);
default = [
"0.0.0.0"
"::"
];
example = "::1";
description = ''
Only listen to incoming requests on specific IP/host. The default listed assumes support for IPv4 and IPv6.
'';
};
server_port = mkOption {
default = 8123;
type = types.port;
description = ''
The port on which to listen.
'';
};
};
lovelace = {
# https://www.home-assistant.io/lovelace/dashboards/
mode = mkOption {
type = types.enum [ "yaml" "storage" ];
default = if cfg.lovelaceConfig != null
then "yaml"
else "storage";
defaultText = literalExpression ''
if cfg.lovelaceConfig != null
then "yaml"
else "storage";
'';
example = "yaml";
description = ''
In what mode should the main Lovelace panel be, <literal>yaml</literal> or <literal>storage</literal> (UI managed).
'';
};
};
};
});
example = literalExpression ''
{
homeassistant = {
name = "Home";
latitude = "!secret latitude";
longitude = "!secret longitude";
elevation = "!secret elevation";
unit_system = "metric";
time_zone = "UTC";
};
frontend = {
themes = "!include_dir_merge_named themes";
};
http = {};
feedreader.urls = [ "https://nixos.org/blogs.xml" ];
}
'';
description = ''
Your <filename>configuration.yaml</filename> as a Nix attribute set.
YAML functions like <link xlink:href="https://www.home-assistant.io/docs/configuration/secrets/">secrets</link>
can be passed as a string and will be unquoted automatically.
Unless this option is explicitly set to <literal>null</literal>
we assume your <filename>configuration.yaml</filename> is
managed through this module and thereby overwritten on startup.
'';
};
configWritable = mkOption {
default = false;
type = types.bool;
description = ''
Whether to make <filename>configuration.yaml</filename> writable.
This will allow you to edit it from Home Assistant's web interface.
This only has an effect if <option>config</option> is set.
However, bear in mind that it will be overwritten at every start of the service.
'';
};
lovelaceConfig = mkOption {
default = null;
type = types.nullOr format.type;
# from https://www.home-assistant.io/lovelace/dashboards/
example = literalExpression ''
{
title = "My Awesome Home";
views = [ {
title = "Example";
cards = [ {
type = "markdown";
title = "Lovelace";
content = "Welcome to your **Lovelace UI**.";
} ];
} ];
}
'';
description = ''
Your <filename>ui-lovelace.yaml</filename> as a Nix attribute set.
Setting this option will automatically set <literal>lovelace.mode</literal> to <literal>yaml</literal>.
Beware that setting this option will delete your previous <filename>ui-lovelace.yaml</filename>
'';
};
lovelaceConfigWritable = mkOption {
default = false;
type = types.bool;
description = ''
Whether to make <filename>ui-lovelace.yaml</filename> writable.
This will allow you to edit it from Home Assistant's web interface.
This only has an effect if <option>lovelaceConfig</option> is set.
However, bear in mind that it will be overwritten at every start of the service.
'';
};
package = mkOption {
default = pkgs.home-assistant.overrideAttrs (oldAttrs: {
doInstallCheck = false;
});
defaultText = literalExpression ''
pkgs.home-assistant.overrideAttrs (oldAttrs: {
doInstallCheck = false;
})
'';
type = types.package;
example = literalExpression ''
pkgs.home-assistant.override {
extraPackages = python3Packages: with python3Packages; [
psycopg2
];
extraComponents = [
"default_config"
"esphome"
"met"
];
}
'';
description = ''
The Home Assistant package to use.
'';
};
openFirewall = mkOption {
default = false;
type = types.bool;
description = "Whether to open the firewall for the specified port.";
};
};
config = mkIf cfg.enable {
assertions = [
{
assertion = cfg.openFirewall -> !isNull cfg.config;
message = "openFirewall can only be used with a declarative config";
}
];
networking.firewall.allowedTCPPorts = mkIf cfg.openFirewall [ cfg.config.http.server_port ];
# symlink the configuration to /etc/home-assistant
environment.etc = lib.mkMerge [
(lib.mkIf (cfg.config != null && !cfg.configWritable) {
"home-assistant/configuration.yaml".source = configFile;
})
(lib.mkIf (cfg.lovelaceConfig != null && !cfg.lovelaceConfigWritable) {
"home-assistant/ui-lovelace.yaml".source = lovelaceConfigFile;
})
];
systemd.services.home-assistant = {
description = "Home Assistant";
after = [
"network-online.target"
# prevent races with database creation
"mysql.service"
"postgresql.service"
];
reloadTriggers = lib.optional (cfg.config != null) configFile
++ lib.optional (cfg.lovelaceConfig != null) lovelaceConfigFile;
preStart = let
copyConfig = if cfg.configWritable then ''
cp --no-preserve=mode ${configFile} "${cfg.configDir}/configuration.yaml"
'' else ''
rm -f "${cfg.configDir}/configuration.yaml"
ln -s /etc/home-assistant/configuration.yaml "${cfg.configDir}/configuration.yaml"
'';
copyLovelaceConfig = if cfg.lovelaceConfigWritable then ''
cp --no-preserve=mode ${lovelaceConfigFile} "${cfg.configDir}/ui-lovelace.yaml"
'' else ''
rm -f "${cfg.configDir}/ui-lovelace.yaml"
ln -s /etc/home-assistant/ui-lovelace.yaml "${cfg.configDir}/ui-lovelace.yaml"
'';
in
(optionalString (cfg.config != null) copyConfig) +
(optionalString (cfg.lovelaceConfig != null) copyLovelaceConfig)
;
serviceConfig = let
# List of capabilities to equip home-assistant with, depending on configured components
capabilities = [
# Empty string first, so we will never accidentally have an empty capability bounding set
# https://github.com/NixOS/nixpkgs/issues/120617#issuecomment-830685115
""
] ++ (unique (optionals (useComponent "bluetooth_tracker" || useComponent "bluetooth_le_tracker") [
# Required for interaction with hci devices and bluetooth sockets
# https://www.home-assistant.io/integrations/bluetooth_le_tracker/#rootless-setup-on-core-installs
"CAP_NET_ADMIN"
"CAP_NET_RAW"
] ++ lib.optionals (useComponent "emulated_hue") [
# Alexa looks for the service on port 80
# https://www.home-assistant.io/integrations/emulated_hue
"CAP_NET_BIND_SERVICE"
] ++ lib.optionals (useComponent "nmap_tracker") [
# https://www.home-assistant.io/integrations/nmap_tracker#linux-capabilities
"CAP_NET_ADMIN"
"CAP_NET_BIND_SERVICE"
"CAP_NET_RAW"
]));
componentsUsingBluetooth = [
# Components that require the AF_BLUETOOTH address family
"bluetooth_tracker"
"bluetooth_le_tracker"
];
componentsUsingPing = [
# Components that require the capset syscall for the ping wrapper
"ping"
"wake_on_lan"
];
componentsUsingSerialDevices = [
# Components that require access to serial devices (/dev/tty*)
# List generated from home-assistant documentation:
# git clone https://github.com/home-assistant/home-assistant.io/
# cd source/_integrations
# rg "/dev/tty" -l | cut -d'/' -f3 | cut -d'.' -f1 | sort
# And then extended by references found in the source code, these
# mostly the ones using config flows already.
"acer_projector"
"alarmdecoder"
"arduino"
"blackbird"
"deconz"
"dsmr"
"edl21"
"elkm1"
"elv"
"enocean"
"firmata"
"flexit"
"gpsd"
"insteon"
"kwb"
"lacrosse"
"mhz19"
"modbus"
"modem_callerid"
"mysensors"
"nad"
"numato"
"rflink"
"rfxtrx"
"scsgate"
"serial"
"serial_pm"
"sms"
"upb"
"usb"
"velbus"
"w800rf32"
"xbee"
"zha"
"zwave"
"zwave_js"
];
in {
ExecStart = "${package}/bin/hass --config '${cfg.configDir}'";
ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
User = "hass";
Group = "hass";
Restart = "on-failure";
RestartForceExitStatus = "100";
SuccessExitStatus = "100";
KillSignal = "SIGINT";
# Hardening
AmbientCapabilities = capabilities;
CapabilityBoundingSet = capabilities;
DeviceAllow = (optionals (any useComponent componentsUsingSerialDevices) [
"char-ttyACM rw"
"char-ttyAMA rw"
"char-ttyUSB rw"
]);
DevicePolicy = "closed";
LockPersonality = true;
MemoryDenyWriteExecute = true;
NoNewPrivileges = true;
PrivateTmp = true;
PrivateUsers = false; # prevents gaining capabilities in the host namespace
ProtectClock = true;
ProtectControlGroups = true;
ProtectHome = true;
ProtectHostname = true;
ProtectKernelLogs = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
ProtectProc = "invisible";
ProcSubset = "all";
ProtectSystem = "strict";
RemoveIPC = true;
ReadWritePaths = let
# Allow rw access to explicitly configured paths
cfgPath = [ "config" "homeassistant" "allowlist_external_dirs" ];
value = attrByPath cfgPath [] cfg;
allowPaths = if isList value then value else singleton value;
in [ "${cfg.configDir}" ] ++ allowPaths;
RestrictAddressFamilies = [
"AF_INET"
"AF_INET6"
"AF_NETLINK"
"AF_UNIX"
] ++ optionals (any useComponent componentsUsingBluetooth) [
"AF_BLUETOOTH"
];
RestrictNamespaces = true;
RestrictRealtime = true;
RestrictSUIDSGID = true;
SupplementaryGroups = optionals (any useComponent componentsUsingSerialDevices) [
"dialout"
];
SystemCallArchitectures = "native";
SystemCallFilter = [
"@system-service"
"~@privileged"
] ++ optionals (any useComponent componentsUsingPing) [
"capset"
];
UMask = "0077";
};
path = [
"/run/wrappers" # needed for ping
];
};
systemd.targets.home-assistant = rec {
description = "Home Assistant";
wantedBy = [ "multi-user.target" ];
wants = [ "home-assistant.service" ];
after = wants;
};
users.users.hass = {
home = cfg.configDir;
createHome = true;
group = "hass";
uid = config.ids.uids.hass;
};
users.groups.hass.gid = config.ids.gids.hass;
};
}