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Vincent Ambo
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third_party/nix/doc/manual/command-ref/nix-build.xml
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third_party/nix/doc/manual/command-ref/nix-build.xml
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<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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version="5.0"
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xml:id="sec-nix-build">
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<refmeta>
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<refentrytitle>nix-build</refentrytitle>
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<manvolnum>1</manvolnum>
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<refmiscinfo class="source">Nix</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>nix-build</refname>
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<refpurpose>build a Nix expression</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix-build</command>
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<xi:include xmlns:xi="http://www.w3.org/2001/XInclude" href="opt-common-syn.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(/db:nop/*)" />
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<arg><option>--arg</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
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<arg><option>--argstr</option> <replaceable>name</replaceable> <replaceable>value</replaceable></arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--attr</option></arg>
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<arg choice='plain'><option>-A</option></arg>
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</group>
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<replaceable>attrPath</replaceable>
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</arg>
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<arg><option>--no-out-link</option></arg>
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<arg><option>--dry-run</option></arg>
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<arg>
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<group choice='req'>
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<arg choice='plain'><option>--out-link</option></arg>
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<arg choice='plain'><option>-o</option></arg>
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</group>
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<replaceable>outlink</replaceable>
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</arg>
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<arg choice='plain' rep='repeat'><replaceable>paths</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>nix-build</command> command builds the derivations
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described by the Nix expressions in <replaceable>paths</replaceable>.
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If the build succeeds, it places a symlink to the result in the
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current directory. The symlink is called <filename>result</filename>.
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If there are multiple Nix expressions, or the Nix expressions evaluate
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to multiple derivations, multiple sequentially numbered symlinks are
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created (<filename>result</filename>, <filename>result-2</filename>,
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and so on).</para>
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<para>If no <replaceable>paths</replaceable> are specified, then
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<command>nix-build</command> will use <filename>default.nix</filename>
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in the current directory, if it exists.</para>
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<para>If an element of <replaceable>paths</replaceable> starts with
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<literal>http://</literal> or <literal>https://</literal>, it is
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interpreted as the URL of a tarball that will be downloaded and
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unpacked to a temporary location. The tarball must include a single
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top-level directory containing at least a file named
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<filename>default.nix</filename>.</para>
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<para><command>nix-build</command> is essentially a wrapper around
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<link
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linkend="sec-nix-instantiate"><command>nix-instantiate</command></link>
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(to translate a high-level Nix expression to a low-level store
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derivation) and <link
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linkend="rsec-nix-store-realise"><command>nix-store
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--realise</command></link> (to build the store derivation).</para>
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<warning><para>The result of the build is automatically registered as
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a root of the Nix garbage collector. This root disappears
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automatically when the <filename>result</filename> symlink is deleted
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or renamed. So don’t rename the symlink.</para></warning>
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</refsection>
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<refsection><title>Options</title>
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<para>All options not listed here are passed to <command>nix-store
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--realise</command>, except for <option>--arg</option> and
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<option>--attr</option> / <option>-A</option> which are passed to
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<command>nix-instantiate</command>. <phrase condition="manual">See
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also <xref linkend="sec-common-options" />.</phrase></para>
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<variablelist>
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<varlistentry><term><option>--no-out-link</option></term>
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<listitem><para>Do not create a symlink to the output path. Note
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that as a result the output does not become a root of the garbage
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collector, and so might be deleted by <command>nix-store
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--gc</command>.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--dry-run</option></term>
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<listitem><para>Show what store paths would be built or downloaded</para></listitem>
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</varlistentry>
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<varlistentry xml:id='opt-out-link'><term><option>--out-link</option> /
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<option>-o</option> <replaceable>outlink</replaceable></term>
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<listitem><para>Change the name of the symlink to the output path
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created from <filename>result</filename> to
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<replaceable>outlink</replaceable>.</para></listitem>
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</varlistentry>
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</variablelist>
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<para>The following common options are supported:</para>
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<variablelist condition="manpage">
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<xi:include href="opt-common.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(//db:variablelist[@xml:id='opt-common']/*)" />
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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-build '<nixpkgs>' -A firefox
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store derivation is /nix/store/qybprl8sz2lc...-firefox-1.5.0.7.drv
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/nix/store/d18hyl92g30l...-firefox-1.5.0.7
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$ ls -l result
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lrwxrwxrwx <replaceable>...</replaceable> result -> /nix/store/d18hyl92g30l...-firefox-1.5.0.7
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$ ls ./result/bin/
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firefox firefox-config</screen>
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<para>If a derivation has multiple outputs,
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<command>nix-build</command> will build the default (first) output.
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You can also build all outputs:
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<screen>
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$ nix-build '<nixpkgs>' -A openssl.all
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</screen>
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This will create a symlink for each output named
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<filename>result-<replaceable>outputname</replaceable></filename>.
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The suffix is omitted if the output name is <literal>out</literal>.
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So if <literal>openssl</literal> has outputs <literal>out</literal>,
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<literal>bin</literal> and <literal>man</literal>,
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<command>nix-build</command> will create symlinks
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<literal>result</literal>, <literal>result-bin</literal> and
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<literal>result-man</literal>. It’s also possible to build a specific
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output:
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<screen>
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$ nix-build '<nixpkgs>' -A openssl.man
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</screen>
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This will create a symlink <literal>result-man</literal>.</para>
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<para>Build a Nix expression given on the command line:
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<screen>
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$ nix-build -E 'with import <nixpkgs> { }; runCommand "foo" { } "echo bar > $out"'
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$ cat ./result
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bar
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</screen>
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</para>
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<para>Build the GNU Hello package from the latest revision of the
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master branch of Nixpkgs:
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<screen>
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$ nix-build https://github.com/NixOS/nixpkgs/archive/master.tar.gz -A hello
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</screen>
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</para>
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</refsection>
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<refsection condition="manpage"><title>Environment variables</title>
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<variablelist>
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<xi:include href="env-common.xml#xmlns(db=http://docbook.org/ns/docbook)xpointer(//db:variablelist[@xml:id='env-common']/*)" />
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</variablelist>
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</refsection>
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</refentry>
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