* Release notes.
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<!--==================================================================-->
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<section xml:id="ssec-relnotes-0.13"><title>Release 0.13 (April NN,
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2009)</title>
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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>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>.</para>
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</listitem>
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</itemizedlist>
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</section>
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<!--==================================================================-->
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<!--==================================================================-->
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<section xml:id="ssec-relnotes-0.12"><title>Release 0.12 (November 20,
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<section xml:id="ssec-relnotes-0.12"><title>Release 0.12 (November 20,
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