139 lines
3.6 KiB
XML
139 lines
3.6 KiB
XML
<refentry 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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<refmeta>
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<refentrytitle><command>nixos-option</command></refentrytitle>
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<manvolnum>8</manvolnum>
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<refmiscinfo class="source">NixOS</refmiscinfo>
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<!-- <refmiscinfo class="version"><xi:include href="version.txt" parse="text"/></refmiscinfo> -->
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</refmeta>
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<refnamediv>
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<refname><command>nixos-option</command></refname>
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<refpurpose>inspect a NixOS configuration</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nixos-option</command>
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<group choice="opt">
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<option>-v</option>
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<option>-d</option>
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<option>-l</option>
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</group>
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<arg choice='plain'><replaceable>option.name</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection><title>Description</title>
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<para>This command evaluates the configuration specified in
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<filename>/etc/nixos/configuration.nix</filename> and returns the properties
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of the option name given as argument. By default, it returns the value of
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the option.</para>
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<para>When the option name is not an option, the command prints the list of
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attributes contained in the attribute set.</para>
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</refsection>
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<refsection><title>Options</title>
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<para>This command accepts the following options:</para>
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<variablelist>
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<varlistentry>
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<term><option>--value</option>, <option>-v</option></term>
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<listitem>
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<para>Returns the value of the option. This is the default operation
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if no other options are defined.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--description</option>, <option>-d</option></term>
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<listitem>
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<para>Return the default value, the example and the description of the
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option when available.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--lookup</option>, <option>-l</option></term>
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<listitem>
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<para>Return the locations where the option is declared and where it
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is defined. This is extremely useful to find sources of errors in
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your configuration.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Environment</title>
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<variablelist>
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<varlistentry>
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<term><envar>NIXOS_CONFIG</envar></term>
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<listitem>
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<para>Path to the main NixOS configuration module. Defaults to
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<filename>/etc/nixos/configuration.nix</filename>.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsection>
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<refsection><title>Examples</title>
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<para>Investigate option values:
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<screen>$ nixos-option boot.loader
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This attribute set contains:
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generationsDir
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grub
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initScript
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$ nixos-option boot.loader.grub.enable
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true</screen></para>
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<para>Prints option information:
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<screen>$ nixos-option -d networking.hostName
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Default: "nixos"
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Description:
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The name of the machine. Leave it empty if you want to obtain
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it from a DHCP server (if using DHCP).</screen></para>
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<para>Find the locations which are declaring and defining an option:
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<screen>$ nixos-option -l hardware.firmware
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Declared by:
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/mnt/data/nix-sources/nixos/modules/services/hardware/udev.nix
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Defined by:
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/path/to/nixpkgs/nixos/modules/system/boot/kernel.nix
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/path/to/nixpkgs/nixos/modules/hardware/network/rt73.nix
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/path/to/nixpkgs/nixos/modules/hardware/network/intel-3945abg.nix
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/path/to/nixpkgs/nixos/modules/hardware/network/intel-2200bg.nix</screen></para>
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</refsection>
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<refsection><title>Bugs</title>
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<para>The author listed in the following section is wrong. If there is any
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other bug, please report to Nicolas Pierron.</para>
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</refsection>
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</refentry>
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