102 lines
3.2 KiB
XML
102 lines
3.2 KiB
XML
<refentry>
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<refnamediv>
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<refname>nix-instantiate</refname>
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<refpurpose>instantiate store derivations from Nix expressions</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-instantiate</command>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xpointer(/nop/*)" />
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<arg><option>--add-root</option> <replaceable>path</replaceable></arg>
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<arg><option>--indirect</option></arg>
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<group choice='opt'>
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<arg choice='plain'><option>--parse-only</option></arg>
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<arg choice='plain'><option>--eval-only</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>files</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>The command <command>nix-instantiate</command> generates <link
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linkend="gloss-derivation">store derivations</link> from (high-level)
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Nix expressions. It loads and evaluates the Nix expressions in each
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of <replaceable>files</replaceable>. Each top-level expression should
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evaluate to a derivation, a list of derivations, or a set of
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derivations. The paths of the resulting store derivations are printed
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on standard output.</para>
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<para>If <replaceable>files</replaceable> is the character
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<literal>-</literal>, then a Nix expression will be read from standard
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input.</para>
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<para>Most users and developers don’t need to use this command
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(<command>nix-env</command> and <command>nix-build</command> perform
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store derivation instantiation from Nix expressions automatically).
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It is most commonly used for implementing new deployment
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policies.</para>
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<para>See also <xref linkend="sec-common-options" /> for a list of
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common options.</para>
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</refsection>
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<refsection><title>Options</title>
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<variablelist>
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<varlistentry>
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<term><option>--add-root</option> <replaceable>path</replaceable></term>
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<term><option>--indirect</option></term>
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<listitem><para>See the <link linkend="opt-add-root">corresponding
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options</link> in <command>nix-store</command>.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--parse-only</option></term>
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<listitem><para>Just parse the input files, and print their
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abstract syntax trees on standard output in ATerm
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format.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--eval-only</option></term>
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<listitem><para>Just parse and evaluate the input files, and print
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the resulting values on standard output. No instantiation of
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store derivations takes place.</para></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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<screen>
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$ nix-instantiate test.nix <lineannotation>(instantiate)</lineannotation>
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/nix/store/cigxbmvy6dzix98dxxh9b6shg7ar5bvs-perl-BerkeleyDB-0.26.drv
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$ nix-store -r $(nix-instantiate test.nix) <lineannotation>(build)</lineannotation>
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<replaceable>...</replaceable>
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/nix/store/qhqk4n8ci095g3sdp93x7rgwyh9rdvgk-perl-BerkeleyDB-0.26 <lineannotation>(output path)</lineannotation>
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$ ls -l /nix/store/qhqk4n8ci095g3sdp93x7rgwyh9rdvgk-perl-BerkeleyDB-0.26
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dr-xr-xr-x 2 eelco users 4096 1970-01-01 01:00 lib
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...</screen>
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</refsection>
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</refentry>
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