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<chapter 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="ch-relnotes-0.6">
<title>Release 0.6 (November 14, 2004)</title>
<itemizedlist>
<listitem>
<para>Rewrite of the normalisation engine.
<itemizedlist>
<listitem><para>Multiple builds can now be performed in parallel
(option <option>-j</option>).</para></listitem>
<listitem><para>Distributed builds. Nix can now call a shell
script to forward builds to Nix installations on remote
machines, which may or may not be of the same platform
type.</para></listitem>
<listitem><para>Option <option>--fallback</option> allows
recovery from broken substitutes.</para></listitem>
<listitem><para>Option <option>--keep-going</option> causes
building of other (unaffected) derivations to continue if one
failed.</para></listitem>
</itemizedlist>
</para>
</listitem>
<listitem><para>Improvements to the garbage collector (i.e., it
should actually work now).</para></listitem>
<listitem><para>Setuid Nix installations allow a Nix store to be
shared among multiple users.</para></listitem>
<listitem><para>Substitute registration is much faster
now.</para></listitem>
<listitem><para>A utility <command>nix-build</command> to build a
Nix expression and create a symlink to the result int the current
directory; useful for testing Nix derivations.</para></listitem>
<listitem><para>Manual updates.</para></listitem>
<listitem>
<para><command>nix-env</command> changes:
<itemizedlist>
<listitem><para>Derivations for other platforms are filtered out
(which can be overridden using
<option>--system-filter</option>).</para></listitem>
<listitem><para><option>--install</option> by default now
uninstall previous derivations with the same
name.</para></listitem>
<listitem><para><option>--upgrade</option> allows upgrading to a
specific version.</para></listitem>
<listitem><para>New operation
<option>--delete-generations</option> to remove profile
generations (necessary for effective garbage
collection).</para></listitem>
<listitem><para>Nicer output (sorted,
columnised).</para></listitem>
</itemizedlist>
</para>
</listitem>
<listitem><para>More sensible verbosity levels all around (builder
output is now shown always, unless <option>-Q</option> is
given).</para></listitem>
<listitem>
<para>Nix expression language changes:
<itemizedlist>
<listitem><para>New language construct: <literal>with
<replaceable>E1</replaceable>;
<replaceable>E2</replaceable></literal> brings all attributes
defined in the attribute set <replaceable>E1</replaceable> in
scope in <replaceable>E2</replaceable>.</para></listitem>
<listitem><para>Added a <function>map</function>
function.</para></listitem>
<listitem><para>Various new operators (e.g., string
concatenation).</para></listitem>
</itemizedlist>
</para>
</listitem>
<listitem><para>Expression evaluation is much
faster.</para></listitem>
<listitem><para>An Emacs mode for editing Nix expressions (with
syntax highlighting and indentation) has been
added.</para></listitem>
<listitem><para>Many bug fixes.</para></listitem>
</itemizedlist>
</chapter>
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