2014-09-16 14:29:00 +02:00
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<section xmlns="http://docbook.org/ns/docbook"
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2014-08-27 18:41:09 +02:00
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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="ssec-relnotes-0.13">
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2016-01-04 14:38:26 +01:00
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<title>Release 0.13 (2009-11-05)</title>
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2014-08-27 18:41:09 +02:00
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<para>This is primarily a bug fix release. It has some new
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features:</para>
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<itemizedlist>
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<listitem>
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<para>Syntactic sugar for writing nested attribute sets. Instead of
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<programlisting>
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{
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foo = {
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bar = 123;
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xyzzy = true;
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};
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a = { b = { c = "d"; }; };
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}
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</programlisting>
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you can write
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<programlisting>
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{
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foo.bar = 123;
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foo.xyzzy = true;
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a.b.c = "d";
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}
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</programlisting>
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This is useful, for instance, in NixOS configuration files.</para>
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</listitem>
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<listitem>
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<para>Support for Nix channels generated by Hydra, the Nix-based
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continuous build system. (Hydra generates NAR archives on the
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fly, so the size and hash of these archives isn’t known in
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advance.)</para>
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</listitem>
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<listitem>
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<para>Support <literal>i686-linux</literal> builds directly on
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<literal>x86_64-linux</literal> Nix installations. This is
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implemented using the <function>personality()</function> syscall,
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which causes <command>uname</command> to return
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<literal>i686</literal> in child processes.</para>
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</listitem>
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<listitem>
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<para>Various improvements to the <literal>chroot</literal>
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support. Building in a <literal>chroot</literal> works quite well
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now.</para>
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</listitem>
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<listitem>
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<para>Nix no longer blocks if it tries to build a path and another
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process is already building the same path. Instead it tries to
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build another buildable path first. This improves
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parallelism.</para>
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</listitem>
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<listitem>
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<para>Support for large (> 4 GiB) files in NAR archives.</para>
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</listitem>
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<listitem>
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<para>Various (performance) improvements to the remote build
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mechanism.</para>
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</listitem>
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<listitem>
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<para>New primops: <varname>builtins.addErrorContext</varname> (to
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add a string to stack traces — useful for debugging),
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<varname>builtins.isBool</varname>,
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<varname>builtins.isString</varname>,
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<varname>builtins.isInt</varname>,
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<varname>builtins.intersectAttrs</varname>.</para>
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</listitem>
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<listitem>
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<para>OpenSolaris support (Sander van der Burg).</para>
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</listitem>
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<listitem>
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<para>Stack traces are no longer displayed unless the
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<option>--show-trace</option> option is used.</para>
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</listitem>
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<listitem>
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<para>The scoping rules for <literal>inherit
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(<replaceable>e</replaceable>) ...</literal> in recursive
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attribute sets have changed. The expression
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<replaceable>e</replaceable> can now refer to the attributes
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defined in the containing set.</para>
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</listitem>
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</itemizedlist>
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2016-01-04 14:38:26 +01:00
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</section>
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