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nixos: nixos/doc/manual/development/writing-modules.xml to CommonMark
This commit is contained in:
Bobby Rong
parent
785d40d4d8
commit
b8efe91ce2
@ -10,7 +10,7 @@
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</para>
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</partintro>
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<xi:include href="../from_md/development/sources.chapter.xml" />
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<xi:include href="writing-modules.xml" />
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<xi:include href="../from_md/development/writing-modules.chapter.xml" />
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<xi:include href="../from_md/development/building-parts.chapter.xml" />
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<xi:include href="../from_md/development/writing-documentation.chapter.xml" />
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<xi:include href="../from_md/development/building-nixos.chapter.xml" />
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166
nixos/doc/manual/development/writing-modules.chapter.md
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166
nixos/doc/manual/development/writing-modules.chapter.md
Normal file
@ -0,0 +1,166 @@
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# Writing NixOS Modules {#sec-writing-modules}
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NixOS has a modular system for declarative configuration. This system
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combines multiple *modules* to produce the full system configuration.
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One of the modules that constitute the configuration is
|
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`/etc/nixos/configuration.nix`. Most of the others live in the
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[`nixos/modules`](https://github.com/NixOS/nixpkgs/tree/master/nixos/modules)
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subdirectory of the Nixpkgs tree.
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|
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Each NixOS module is a file that handles one logical aspect of the
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configuration, such as a specific kind of hardware, a service, or
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network settings. A module configuration does not have to handle
|
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everything from scratch; it can use the functionality provided by other
|
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modules for its implementation. Thus a module can *declare* options that
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can be used by other modules, and conversely can *define* options
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provided by other modules in its own implementation. For example, the
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module
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[`pam.nix`](https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/security/pam.nix)
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declares the option `security.pam.services` that allows other modules (e.g.
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[`sshd.nix`](https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/networking/ssh/sshd.nix))
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to define PAM services; and it defines the option `environment.etc` (declared by
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[`etc.nix`](https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/system/etc/etc.nix))
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to cause files to be created in `/etc/pam.d`.
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In [](#sec-configuration-syntax), we saw the following structure of
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NixOS modules:
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```nix
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{ config, pkgs, ... }:
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{ option definitions
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}
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```
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This is actually an *abbreviated* form of module that only defines
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options, but does not declare any. The structure of full NixOS modules
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is shown in [Example: Structure of NixOS Modules](#ex-module-syntax).
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::: {#ex-module-syntax .example}
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::: {.title}
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**Example: Structure of NixOS Modules**
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:::
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```nix
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{ config, pkgs, ... }:
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{
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imports =
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[ paths of other modules
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];
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options = {
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option declarations
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};
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config = {
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option definitions
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};
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}
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```
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:::
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The meaning of each part is as follows.
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- The first line makes the current Nix expression a function. The variable
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`pkgs` contains Nixpkgs (by default, it takes the `nixpkgs` entry of
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`NIX_PATH`, see the [Nix manual](https://nixos.org/manual/nix/stable/#sec-common-env)
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for further details), while `config` contains the full system
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configuration. This line can be omitted if there is no reference to
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`pkgs` and `config` inside the module.
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- This `imports` list enumerates the paths to other NixOS modules that
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should be included in the evaluation of the system configuration. A
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default set of modules is defined in the file `modules/module-list.nix`.
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These don\'t need to be added in the import list.
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- The attribute `options` is a nested set of *option declarations*
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(described below).
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- The attribute `config` is a nested set of *option definitions* (also
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described below).
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[Example: NixOS Module for the "locate" Service](#locate-example)
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shows a module that handles the regular update of the "locate" database,
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an index of all files in the file system. This module declares two
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options that can be defined by other modules (typically the user's
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`configuration.nix`): `services.locate.enable` (whether the database should
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be updated) and `services.locate.interval` (when the update should be done).
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It implements its functionality by defining two options declared by other
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modules: `systemd.services` (the set of all systemd services) and
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`systemd.timers` (the list of commands to be executed periodically by
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`systemd`).
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::: {#locate-example .example}
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::: {.title}
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**Example: NixOS Module for the "locate" Service**
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:::
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```nix
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.locate;
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in {
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options.services.locate = {
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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If enabled, NixOS will periodically update the database of
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files used by the locate command.
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'';
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};
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interval = mkOption {
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type = types.str;
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default = "02:15";
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example = "hourly";
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description = ''
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Update the locate database at this interval. Updates by
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default at 2:15 AM every day.
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The format is described in
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systemd.time(7).
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'';
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};
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# Other options omitted for documentation
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};
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config = {
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systemd.services.update-locatedb =
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{ description = "Update Locate Database";
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path = [ pkgs.su ];
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script =
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''
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mkdir -m 0755 -p $(dirname ${toString cfg.output})
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exec updatedb \
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--localuser=${cfg.localuser} \
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${optionalString (!cfg.includeStore) "--prunepaths='/nix/store'"} \
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--output=${toString cfg.output} ${concatStringsSep " " cfg.extraFlags}
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'';
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};
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systemd.timers.update-locatedb = mkIf cfg.enable
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{ description = "Update timer for locate database";
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partOf = [ "update-locatedb.service" ];
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wantedBy = [ "timers.target" ];
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timerConfig.OnCalendar = cfg.interval;
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};
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};
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}
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```
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:::
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```{=docbook}
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<xi:include href="option-declarations.section.xml" />
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<xi:include href="option-types.section.xml" />
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<xi:include href="option-def.section.xml" />
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<xi:include href="assertions.section.xml" />
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<xi:include href="meta-attributes.section.xml" />
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<xi:include href="importing-modules.section.xml" />
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<xi:include href="replace-modules.section.xml" />
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<xi:include href="freeform-modules.section.xml" />
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<xi:include href="settings-options.section.xml" />
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```
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@ -1,191 +0,0 @@
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<chapter xmlns="http://docbook.org/ns/docbook"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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version="5.0"
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||||
xml:id="sec-writing-modules">
|
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<title>Writing NixOS Modules</title>
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<para>
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NixOS has a modular system for declarative configuration. This system
|
||||
combines multiple <emphasis>modules</emphasis> to produce the full system
|
||||
configuration. One of the modules that constitute the configuration is
|
||||
<filename>/etc/nixos/configuration.nix</filename>. Most of the others live in
|
||||
the
|
||||
<link
|
||||
xlink:href="https://github.com/NixOS/nixpkgs/tree/master/nixos/modules"><filename>nixos/modules</filename></link>
|
||||
subdirectory of the Nixpkgs tree.
|
||||
</para>
|
||||
<para>
|
||||
Each NixOS module is a file that handles one logical aspect of the
|
||||
configuration, such as a specific kind of hardware, a service, or network
|
||||
settings. A module configuration does not have to handle everything from
|
||||
scratch; it can use the functionality provided by other modules for its
|
||||
implementation. Thus a module can <emphasis>declare</emphasis> options that
|
||||
can be used by other modules, and conversely can <emphasis>define</emphasis>
|
||||
options provided by other modules in its own implementation. For example, the
|
||||
module
|
||||
<link
|
||||
xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/security/pam.nix"><filename>pam.nix</filename></link>
|
||||
declares the option <option>security.pam.services</option> that allows other
|
||||
modules (e.g.
|
||||
<link
|
||||
xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/networking/ssh/sshd.nix"><filename>sshd.nix</filename></link>)
|
||||
to define PAM services; and it defines the option
|
||||
<option>environment.etc</option> (declared by
|
||||
<link
|
||||
xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/system/etc/etc.nix"><filename>etc.nix</filename></link>)
|
||||
to cause files to be created in <filename>/etc/pam.d</filename>.
|
||||
</para>
|
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<para xml:id="para-module-syn">
|
||||
In <xref
|
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linkend="sec-configuration-syntax"/>, we saw the following structure
|
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of NixOS modules:
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<programlisting>
|
||||
{ config, pkgs, ... }:
|
||||
|
||||
{ <replaceable>option definitions</replaceable>
|
||||
}
|
||||
</programlisting>
|
||||
This is actually an <emphasis>abbreviated</emphasis> form of module that only
|
||||
defines options, but does not declare any. The structure of full NixOS
|
||||
modules is shown in <xref linkend='ex-module-syntax' />.
|
||||
</para>
|
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<example xml:id='ex-module-syntax'>
|
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<title>Structure of NixOS Modules</title>
|
||||
<programlisting>
|
||||
{ config, pkgs, ... }: <co xml:id='module-syntax-1' />
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|
||||
{
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||||
imports =
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||||
[ <replaceable>paths of other modules</replaceable> <co xml:id='module-syntax-2' />
|
||||
];
|
||||
|
||||
options = {
|
||||
<replaceable>option declarations</replaceable> <co xml:id='module-syntax-3' />
|
||||
};
|
||||
|
||||
config = {
|
||||
<replaceable>option definitions</replaceable> <co xml:id='module-syntax-4' />
|
||||
};
|
||||
}</programlisting>
|
||||
</example>
|
||||
<para>
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||||
The meaning of each part is as follows.
|
||||
<calloutlist>
|
||||
<callout arearefs='module-syntax-1'>
|
||||
<para>
|
||||
This line makes the current Nix expression a function. The variable
|
||||
<varname>pkgs</varname> contains Nixpkgs (by default, it takes the
|
||||
<varname>nixpkgs</varname> entry of <envar>NIX_PATH</envar>, see the <link
|
||||
xlink:href="https://nixos.org/manual/nix/stable/#sec-common-env">Nix
|
||||
manual</link> for further details), while <varname>config</varname>
|
||||
contains the full system configuration. This line can be omitted if there
|
||||
is no reference to <varname>pkgs</varname> and <varname>config</varname>
|
||||
inside the module.
|
||||
</para>
|
||||
</callout>
|
||||
<callout arearefs='module-syntax-2'>
|
||||
<para>
|
||||
This list enumerates the paths to other NixOS modules that should be
|
||||
included in the evaluation of the system configuration. A default set of
|
||||
modules is defined in the file
|
||||
<filename>modules/module-list.nix</filename>. These don't need to be added
|
||||
in the import list.
|
||||
</para>
|
||||
</callout>
|
||||
<callout arearefs='module-syntax-3'>
|
||||
<para>
|
||||
The attribute <varname>options</varname> is a nested set of
|
||||
<emphasis>option declarations</emphasis> (described below).
|
||||
</para>
|
||||
</callout>
|
||||
<callout arearefs='module-syntax-4'>
|
||||
<para>
|
||||
The attribute <varname>config</varname> is a nested set of
|
||||
<emphasis>option definitions</emphasis> (also described below).
|
||||
</para>
|
||||
</callout>
|
||||
</calloutlist>
|
||||
</para>
|
||||
<para>
|
||||
<xref linkend='locate-example' /> shows a module that handles the regular
|
||||
update of the “locate” database, an index of all files in the file
|
||||
system. This module declares two options that can be defined by other modules
|
||||
(typically the user’s <filename>configuration.nix</filename>):
|
||||
<option>services.locate.enable</option> (whether the database should be
|
||||
updated) and <option>services.locate.interval</option> (when the update
|
||||
should be done). It implements its functionality by defining two options
|
||||
declared by other modules: <option>systemd.services</option> (the set of all
|
||||
systemd services) and <option>systemd.timers</option> (the list of commands
|
||||
to be executed periodically by <command>systemd</command>).
|
||||
</para>
|
||||
<example xml:id='locate-example'>
|
||||
<title>NixOS Module for the “locate” Service</title>
|
||||
<programlisting>
|
||||
{ config, lib, pkgs, ... }:
|
||||
|
||||
with lib;
|
||||
|
||||
let
|
||||
cfg = config.services.locate;
|
||||
in {
|
||||
options.services.locate = {
|
||||
enable = mkOption {
|
||||
type = types.bool;
|
||||
default = false;
|
||||
description = ''
|
||||
If enabled, NixOS will periodically update the database of
|
||||
files used by the <command>locate</command> command.
|
||||
'';
|
||||
};
|
||||
|
||||
interval = mkOption {
|
||||
type = types.str;
|
||||
default = "02:15";
|
||||
example = "hourly";
|
||||
description = ''
|
||||
Update the locate database at this interval. Updates by
|
||||
default at 2:15 AM every day.
|
||||
|
||||
The format is described in
|
||||
<citerefentry><refentrytitle>systemd.time</refentrytitle>
|
||||
<manvolnum>7</manvolnum></citerefentry>.
|
||||
'';
|
||||
};
|
||||
|
||||
# Other options omitted for documentation
|
||||
};
|
||||
|
||||
config = {
|
||||
systemd.services.update-locatedb =
|
||||
{ description = "Update Locate Database";
|
||||
path = [ pkgs.su ];
|
||||
script =
|
||||
''
|
||||
mkdir -m 0755 -p $(dirname ${toString cfg.output})
|
||||
exec updatedb \
|
||||
--localuser=${cfg.localuser} \
|
||||
${optionalString (!cfg.includeStore) "--prunepaths='/nix/store'"} \
|
||||
--output=${toString cfg.output} ${concatStringsSep " " cfg.extraFlags}
|
||||
'';
|
||||
};
|
||||
|
||||
systemd.timers.update-locatedb = mkIf cfg.enable
|
||||
{ description = "Update timer for locate database";
|
||||
partOf = [ "update-locatedb.service" ];
|
||||
wantedBy = [ "timers.target" ];
|
||||
timerConfig.OnCalendar = cfg.interval;
|
||||
};
|
||||
};
|
||||
}
|
||||
</programlisting>
|
||||
</example>
|
||||
<xi:include href="../from_md/development/option-declarations.section.xml" />
|
||||
<xi:include href="../from_md/development/option-types.section.xml" />
|
||||
<xi:include href="../from_md/development/option-def.section.xml" />
|
||||
<xi:include href="../from_md/development/assertions.section.xml" />
|
||||
<xi:include href="../from_md/development/meta-attributes.section.xml" />
|
||||
<xi:include href="../from_md/development/importing-modules.section.xml" />
|
||||
<xi:include href="../from_md/development/replace-modules.section.xml" />
|
||||
<xi:include href="../from_md/development/freeform-modules.section.xml" />
|
||||
<xi:include href="../from_md/development/settings-options.section.xml" />
|
||||
</chapter>
|
||||
196
nixos/doc/manual/from_md/development/writing-modules.chapter.xml
Normal file
196
nixos/doc/manual/from_md/development/writing-modules.chapter.xml
Normal file
@ -0,0 +1,196 @@
|
||||
<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xi="http://www.w3.org/2001/XInclude" xml:id="sec-writing-modules">
|
||||
<title>Writing NixOS Modules</title>
|
||||
<para>
|
||||
NixOS has a modular system for declarative configuration. This
|
||||
system combines multiple <emphasis>modules</emphasis> to produce the
|
||||
full system configuration. One of the modules that constitute the
|
||||
configuration is <literal>/etc/nixos/configuration.nix</literal>.
|
||||
Most of the others live in the
|
||||
<link xlink:href="https://github.com/NixOS/nixpkgs/tree/master/nixos/modules"><literal>nixos/modules</literal></link>
|
||||
subdirectory of the Nixpkgs tree.
|
||||
</para>
|
||||
<para>
|
||||
Each NixOS module is a file that handles one logical aspect of the
|
||||
configuration, such as a specific kind of hardware, a service, or
|
||||
network settings. A module configuration does not have to handle
|
||||
everything from scratch; it can use the functionality provided by
|
||||
other modules for its implementation. Thus a module can
|
||||
<emphasis>declare</emphasis> options that can be used by other
|
||||
modules, and conversely can <emphasis>define</emphasis> options
|
||||
provided by other modules in its own implementation. For example,
|
||||
the module
|
||||
<link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/security/pam.nix"><literal>pam.nix</literal></link>
|
||||
declares the option <literal>security.pam.services</literal> that
|
||||
allows other modules (e.g.
|
||||
<link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/services/networking/ssh/sshd.nix"><literal>sshd.nix</literal></link>)
|
||||
to define PAM services; and it defines the option
|
||||
<literal>environment.etc</literal> (declared by
|
||||
<link xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/system/etc/etc.nix"><literal>etc.nix</literal></link>)
|
||||
to cause files to be created in <literal>/etc/pam.d</literal>.
|
||||
</para>
|
||||
<para>
|
||||
In <xref linkend="sec-configuration-syntax" />, we saw the following
|
||||
structure of NixOS modules:
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
{ config, pkgs, ... }:
|
||||
|
||||
{ option definitions
|
||||
}
|
||||
</programlisting>
|
||||
<para>
|
||||
This is actually an <emphasis>abbreviated</emphasis> form of module
|
||||
that only defines options, but does not declare any. The structure
|
||||
of full NixOS modules is shown in
|
||||
<link linkend="ex-module-syntax">Example: Structure of NixOS
|
||||
Modules</link>.
|
||||
</para>
|
||||
<anchor xml:id="ex-module-syntax" />
|
||||
<para>
|
||||
<emphasis role="strong">Example: Structure of NixOS
|
||||
Modules</emphasis>
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
{ config, pkgs, ... }:
|
||||
|
||||
{
|
||||
imports =
|
||||
[ paths of other modules
|
||||
];
|
||||
|
||||
options = {
|
||||
option declarations
|
||||
};
|
||||
|
||||
config = {
|
||||
option definitions
|
||||
};
|
||||
}
|
||||
</programlisting>
|
||||
<para>
|
||||
The meaning of each part is as follows.
|
||||
</para>
|
||||
<itemizedlist>
|
||||
<listitem>
|
||||
<para>
|
||||
The first line makes the current Nix expression a function. The
|
||||
variable <literal>pkgs</literal> contains Nixpkgs (by default,
|
||||
it takes the <literal>nixpkgs</literal> entry of
|
||||
<literal>NIX_PATH</literal>, see the
|
||||
<link xlink:href="https://nixos.org/manual/nix/stable/#sec-common-env">Nix
|
||||
manual</link> for further details), while
|
||||
<literal>config</literal> contains the full system
|
||||
configuration. This line can be omitted if there is no reference
|
||||
to <literal>pkgs</literal> and <literal>config</literal> inside
|
||||
the module.
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>
|
||||
This <literal>imports</literal> list enumerates the paths to
|
||||
other NixOS modules that should be included in the evaluation of
|
||||
the system configuration. A default set of modules is defined in
|
||||
the file <literal>modules/module-list.nix</literal>. These don't
|
||||
need to be added in the import list.
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>
|
||||
The attribute <literal>options</literal> is a nested set of
|
||||
<emphasis>option declarations</emphasis> (described below).
|
||||
</para>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<para>
|
||||
The attribute <literal>config</literal> is a nested set of
|
||||
<emphasis>option definitions</emphasis> (also described below).
|
||||
</para>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
<para>
|
||||
<link linkend="locate-example">Example: NixOS Module for the
|
||||
<quote>locate</quote> Service</link> shows a module that handles the
|
||||
regular update of the <quote>locate</quote> database, an index of
|
||||
all files in the file system. This module declares two options that
|
||||
can be defined by other modules (typically the user’s
|
||||
<literal>configuration.nix</literal>):
|
||||
<literal>services.locate.enable</literal> (whether the database
|
||||
should be updated) and <literal>services.locate.interval</literal>
|
||||
(when the update should be done). It implements its functionality by
|
||||
defining two options declared by other modules:
|
||||
<literal>systemd.services</literal> (the set of all systemd
|
||||
services) and <literal>systemd.timers</literal> (the list of
|
||||
commands to be executed periodically by <literal>systemd</literal>).
|
||||
</para>
|
||||
<anchor xml:id="locate-example" />
|
||||
<para>
|
||||
<emphasis role="strong">Example: NixOS Module for the
|
||||
<quote>locate</quote> Service</emphasis>
|
||||
</para>
|
||||
<programlisting language="bash">
|
||||
{ config, lib, pkgs, ... }:
|
||||
|
||||
with lib;
|
||||
|
||||
let
|
||||
cfg = config.services.locate;
|
||||
in {
|
||||
options.services.locate = {
|
||||
enable = mkOption {
|
||||
type = types.bool;
|
||||
default = false;
|
||||
description = ''
|
||||
If enabled, NixOS will periodically update the database of
|
||||
files used by the locate command.
|
||||
'';
|
||||
};
|
||||
|
||||
interval = mkOption {
|
||||
type = types.str;
|
||||
default = "02:15";
|
||||
example = "hourly";
|
||||
description = ''
|
||||
Update the locate database at this interval. Updates by
|
||||
default at 2:15 AM every day.
|
||||
|
||||
The format is described in
|
||||
systemd.time(7).
|
||||
'';
|
||||
};
|
||||
|
||||
# Other options omitted for documentation
|
||||
};
|
||||
|
||||
config = {
|
||||
systemd.services.update-locatedb =
|
||||
{ description = "Update Locate Database";
|
||||
path = [ pkgs.su ];
|
||||
script =
|
||||
''
|
||||
mkdir -m 0755 -p $(dirname ${toString cfg.output})
|
||||
exec updatedb \
|
||||
--localuser=${cfg.localuser} \
|
||||
${optionalString (!cfg.includeStore) "--prunepaths='/nix/store'"} \
|
||||
--output=${toString cfg.output} ${concatStringsSep " " cfg.extraFlags}
|
||||
'';
|
||||
};
|
||||
|
||||
systemd.timers.update-locatedb = mkIf cfg.enable
|
||||
{ description = "Update timer for locate database";
|
||||
partOf = [ "update-locatedb.service" ];
|
||||
wantedBy = [ "timers.target" ];
|
||||
timerConfig.OnCalendar = cfg.interval;
|
||||
};
|
||||
};
|
||||
}
|
||||
</programlisting>
|
||||
<xi:include href="option-declarations.section.xml" />
|
||||
<xi:include href="option-types.section.xml" />
|
||||
<xi:include href="option-def.section.xml" />
|
||||
<xi:include href="assertions.section.xml" />
|
||||
<xi:include href="meta-attributes.section.xml" />
|
||||
<xi:include href="importing-modules.section.xml" />
|
||||
<xi:include href="replace-modules.section.xml" />
|
||||
<xi:include href="freeform-modules.section.xml" />
|
||||
<xi:include href="settings-options.section.xml" />
|
||||
</chapter>
|
||||
Loading…
Reference in New Issue
Block a user