2005-04-07 10:47:58 +00:00
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<refentry>
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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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2005-04-10 20:54:21 +00:00
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<arg><option>--add-drv-link</option></arg>
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<arg><option>--no-link</option></arg>
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2005-04-07 10:47:58 +00:00
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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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2005-07-13 17:39:10 +00:00
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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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2005-04-07 10:47:58 +00:00
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<note><para><command>nix-build</command> is essentially a wrapper
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around <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
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derivation).</para></note>
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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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<variablelist>
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<varlistentry><term><option>--add-drv-link</option></term>
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<listitem><para>Add a symlink in the current directory to the
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store derivation produced by <command>nix-instantiate</command>.
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The symlink is called <filename>derivation</filename> (which is
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numbered in the case of multiple derivations). The derivation is
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a root of the garbage collector until the symlink is deleted or
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renamed.</para></listitem>
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</varlistentry>
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<varlistentry><term><option>--no-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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</variablelist>
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</refsection>
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</refentry>
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