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<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
version="5.0"
xml:id="ssec-relnotes-0.13">
<title>Release 0.13 (November 5, 2009)</title>
<para>This is primarily a bug fix release. It has some new
features:</para>
<itemizedlist>
<listitem>
<para>Syntactic sugar for writing nested attribute sets. Instead of
<programlisting>
{
foo = {
bar = 123;
xyzzy = true;
};
a = { b = { c = "d"; }; };
}
</programlisting>
you can write
<programlisting>
{
foo.bar = 123;
foo.xyzzy = true;
a.b.c = "d";
}
</programlisting>
This is useful, for instance, in NixOS configuration files.</para>
</listitem>
<listitem>
<para>Support for Nix channels generated by Hydra, the Nix-based
continuous build system. (Hydra generates NAR archives on the
fly, so the size and hash of these archives isn’t known in
advance.)</para>
</listitem>
<listitem>
<para>Support <literal>i686-linux</literal> builds directly on
<literal>x86_64-linux</literal> Nix installations. This is
implemented using the <function>personality()</function> syscall,
which causes <command>uname</command> to return
<literal>i686</literal> in child processes.</para>
</listitem>
<listitem>
<para>Various improvements to the <literal>chroot</literal>
support. Building in a <literal>chroot</literal> works quite well
now.</para>
</listitem>
<listitem>
<para>Nix no longer blocks if it tries to build a path and another
process is already building the same path. Instead it tries to
build another buildable path first. This improves
parallelism.</para>
</listitem>
<listitem>
<para>Support for large (> 4 GiB) files in NAR archives.</para>
</listitem>
<listitem>
<para>Various (performance) improvements to the remote build
mechanism.</para>
</listitem>
<listitem>
<para>New primops: <varname>builtins.addErrorContext</varname> (to
add a string to stack traces — useful for debugging),
<varname>builtins.isBool</varname>,
<varname>builtins.isString</varname>,
<varname>builtins.isInt</varname>,
<varname>builtins.intersectAttrs</varname>.</para>
</listitem>
<listitem>
<para>OpenSolaris support (Sander van der Burg).</para>
</listitem>
<listitem>
<para>Stack traces are no longer displayed unless the
<option>--show-trace</option> option is used.</para>
</listitem>
<listitem>
<para>The scoping rules for <literal>inherit
(<replaceable>e</replaceable>) ...</literal> in recursive
attribute sets have changed. The expression
<replaceable>e</replaceable> can now refer to the attributes
defined in the containing set.</para>
</listitem>
</itemizedlist>
</section>
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