If you define a unit, and either systemd or a package in systemd.packages already provides that unit, then we now generate a file /etc/systemd/system/<unit>.d/overrides.conf. This makes it possible to use upstream units, while allowing them to be customised from the NixOS configuration. For instance, the module nix-daemon.nix now uses the units provided by the Nix package. And all unit definitions that duplicated upstream systemd units are finally gone. This makes the baseUnit option unnecessary, so I've removed it.
415 lines
12 KiB
Nix
415 lines
12 KiB
Nix
{ config, lib }:
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with lib;
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let
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checkService = v:
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let assertValueOneOf = name: values: attr:
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let val = getAttr name attr;
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in optional ( hasAttr name attr && !elem val values) "Systemd service field `${name}' cannot have value `${val}'.";
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checkType = assertValueOneOf "Type" ["simple" "forking" "oneshot" "dbus" "notify" "idle"];
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checkRestart = assertValueOneOf "Restart" ["no" "on-success" "on-failure" "on-abort" "always"];
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errors = concatMap (c: c v) [checkType checkRestart];
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in if errors == [] then true
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else builtins.trace (concatStringsSep "\n" errors) false;
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unitOption = mkOptionType {
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name = "systemd option";
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merge = loc: defs:
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let
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defs' = filterOverrides defs;
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defs'' = getValues defs';
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in
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if isList (head defs'')
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then concatLists defs''
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else mergeOneOption loc defs';
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};
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in rec {
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unitOptions = {
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enable = 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 false, this unit will be a symlink to
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/dev/null. This is primarily useful to prevent specific
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template instances (e.g. <literal>serial-getty@ttyS0</literal>)
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from being started.
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'';
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};
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description = mkOption {
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default = "";
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type = types.str;
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description = "Description of this unit used in systemd messages and progress indicators.";
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};
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requires = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Start the specified units when this unit is started, and stop
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this unit when the specified units are stopped or fail.
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'';
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};
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wants = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Start the specified units when this unit is started.
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'';
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};
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after = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are started at the same time as
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this unit, delay this unit until they have started.
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'';
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};
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before = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are started at the same time as
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this unit, delay them until this unit has started.
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'';
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};
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bindsTo = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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Like ‘requires’, but in addition, if the specified units
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unexpectedly disappear, this unit will be stopped as well.
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'';
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};
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partOf = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are stopped or restarted, then this
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unit is stopped or restarted as well.
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'';
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};
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conflicts = mkOption {
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default = [];
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type = types.listOf types.str;
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description = ''
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If the specified units are started, then this unit is stopped
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and vice versa.
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'';
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};
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requiredBy = mkOption {
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default = [];
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type = types.listOf types.str;
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description = "Units that require (i.e. depend on and need to go down with) this unit.";
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};
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wantedBy = mkOption {
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default = [];
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type = types.listOf types.str;
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description = "Units that want (i.e. depend on) this unit.";
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};
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unitConfig = mkOption {
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default = {};
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example = { RequiresMountsFor = "/data"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Unit]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.unit</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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restartTriggers = mkOption {
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default = [];
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type = types.listOf types.unspecified;
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description = ''
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An arbitrary list of items such as derivations. If any item
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in the list changes between reconfigurations, the service will
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be restarted.
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'';
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};
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};
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serviceOptions = unitOptions // {
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environment = mkOption {
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default = {};
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type = types.attrs; # FIXME
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example = { PATH = "/foo/bar/bin"; LANG = "nl_NL.UTF-8"; };
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description = "Environment variables passed to the service's processes.";
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};
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path = mkOption {
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default = [];
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apply = ps: "${makeSearchPath "bin" ps}:${makeSearchPath "sbin" ps}";
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description = ''
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Packages added to the service's <envar>PATH</envar>
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environment variable. Both the <filename>bin</filename>
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and <filename>sbin</filename> subdirectories of each
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package are added.
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'';
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};
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serviceConfig = mkOption {
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default = {};
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example =
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{ StartLimitInterval = 10;
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RestartSec = 5;
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};
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type = types.addCheck (types.attrsOf unitOption) checkService;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Service]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.service</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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script = mkOption {
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type = types.lines;
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default = "";
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description = "Shell commands executed as the service's main process.";
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};
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scriptArgs = mkOption {
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type = types.str;
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default = "";
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description = "Arguments passed to the main process script.";
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};
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preStart = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed before the service's main process
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is started.
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'';
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};
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postStart = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed after the service's main process
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is started.
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'';
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};
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preStop = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed to stop the service.
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'';
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};
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postStop = mkOption {
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type = types.lines;
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default = "";
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description = ''
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Shell commands executed after the service's main process
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has exited.
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'';
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};
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restartIfChanged = mkOption {
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type = types.bool;
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default = true;
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description = ''
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Whether the service should be restarted during a NixOS
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configuration switch if its definition has changed.
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'';
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};
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reloadIfChanged = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether the service should be reloaded during a NixOS
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configuration switch if its definition has changed. If
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enabled, the value of <option>restartIfChanged</option> is
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ignored.
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'';
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};
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stopIfChanged = mkOption {
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type = types.bool;
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default = true;
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description = ''
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If set, a changed unit is restarted by calling
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<command>systemctl stop</command> in the old configuration,
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then <command>systemctl start</command> in the new one.
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Otherwise, it is restarted in a single step using
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<command>systemctl restart</command> in the new configuration.
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The latter is less correct because it runs the
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<literal>ExecStop</literal> commands from the new
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configuration.
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'';
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};
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startAt = mkOption {
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type = types.str;
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default = "";
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example = "Sun 14:00:00";
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description = ''
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Automatically start this unit at the given date/time, which
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must be in the format described in
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>. This is equivalent
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to adding a corresponding timer unit with
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<option>OnCalendar</option> set to the value given here.
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'';
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};
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};
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socketOptions = unitOptions // {
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listenStreams = mkOption {
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default = [];
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type = types.listOf types.str;
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example = [ "0.0.0.0:993" "/run/my-socket" ];
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description = ''
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For each item in this list, a <literal>ListenStream</literal>
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option in the <literal>[Socket]</literal> section will be created.
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'';
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};
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socketConfig = mkOption {
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default = {};
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example = { ListenStream = "/run/my-socket"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Socket]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.socket</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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timerOptions = unitOptions // {
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timerConfig = mkOption {
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default = {};
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example = { OnCalendar = "Sun 14:00:00"; Unit = "foo.service"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Timer]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.timer</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> and
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<citerefentry><refentrytitle>systemd.time</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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pathOptions = unitOptions // {
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pathConfig = mkOption {
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default = {};
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example = { PathChanged = "/some/path"; Unit = "changedpath.service"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Path]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.path</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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mountOptions = unitOptions // {
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what = mkOption {
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example = "/dev/sda1";
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type = types.str;
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description = "Absolute path of device node, file or other resource. (Mandatory)";
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};
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where = mkOption {
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example = "/mnt";
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type = types.str;
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description = ''
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Absolute path of a directory of the mount point.
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Will be created if it doesn't exist. (Mandatory)
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'';
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};
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type = mkOption {
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default = "";
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example = "ext4";
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type = types.str;
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description = "File system type.";
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};
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options = mkOption {
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default = "";
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example = "noatime";
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type = types.commas;
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description = "Options used to mount the file system.";
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};
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mountConfig = mkOption {
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default = {};
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example = { DirectoryMode = "0775"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Mount]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.mount</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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automountOptions = unitOptions // {
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where = mkOption {
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example = "/mnt";
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type = types.str;
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description = ''
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Absolute path of a directory of the mount point.
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Will be created if it doesn't exist. (Mandatory)
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'';
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};
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automountConfig = mkOption {
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default = {};
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example = { DirectoryMode = "0775"; };
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type = types.attrsOf unitOption;
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description = ''
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Each attribute in this set specifies an option in the
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<literal>[Automount]</literal> section of the unit. See
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<citerefentry><refentrytitle>systemd.automount</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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'';
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};
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};
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}
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