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135 lines
3.3 KiB
XML
135 lines
3.3 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>
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</refentrytitle><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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<arg>
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<group choice='req'>
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<arg choice='plain'><option>-r</option></arg>
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<arg choice='plain'><option>--recursive</option></arg>
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</group>
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</arg>
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<arg>
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<option>-I</option> <replaceable>path</replaceable>
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</arg>
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<arg>
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<replaceable>option.name</replaceable>
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</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsection>
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<title>Description</title>
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<para>
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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.
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</para>
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<para>
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When the option name is not an option, the command prints the list of
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attributes contained in the attribute set.
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</para>
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</refsection>
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<refsection>
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<title>Options</title>
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<para>
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This command accepts the following options:
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</para>
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<variablelist>
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<varlistentry>
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<term><option>-r</option></term>
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<term><option>--recursive</option></term>
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<listitem>
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<para>
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Print all the values at or below the specified path recursively.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>-I</option> <replaceable>path</replaceable>
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</term>
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<listitem>
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<para>
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This option is passed to the underlying
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<command>nix-instantiate</command> invocation.
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</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>
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<title>Environment</title>
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<variablelist>
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<varlistentry>
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<term>
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<envar>NIXOS_CONFIG</envar>
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</term>
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<listitem>
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<para>
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Path to the main NixOS configuration module. Defaults to
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<filename>/etc/nixos/configuration.nix</filename>.
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</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>
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<title>Examples</title>
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<para>
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Investigate option values:
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<screen><prompt>$ </prompt>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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<prompt>$ </prompt>nixos-option boot.loader.grub.enable
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Value:
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true
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Default:
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true
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Description:
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Whether to enable the GNU GRUB boot loader.
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Declared by:
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"/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
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Defined by:
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"/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/system/boot/loader/grub/grub.nix"
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</screen>
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</para>
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</refsection>
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<refsection>
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<title>Bugs</title>
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<para>
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The author listed in the following section is wrong. If there is any other
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bug, please report to Nicolas Pierron.
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</para>
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</refsection>
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<refsection>
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<title>See also</title>
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<para>
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<citerefentry>
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<refentrytitle>configuration.nix</refentrytitle>
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<manvolnum>5</manvolnum>
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</citerefentry>
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</para>
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</refsection>
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</refentry>
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