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3.2 KiB
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98 lines
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3.2 KiB
XML
<chapter xmlns="http://docbook.org/ns/docbook"
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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="ch-relnotes-0.9">
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<title>Release 0.9 (September 16, 2005)</title>
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<para>NOTE: this version of Nix uses Berkeley DB 4.3 instead of 4.2.
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The database is upgraded automatically, but you should be careful not
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to use old versions of Nix that still use Berkeley DB 4.2. In
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particular, if you use a Nix installed through Nix, you should run
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<screen>
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$ nix-store --clear-substitutes</screen>
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first.</para>
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<itemizedlist>
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<listitem><para>Unpacking of patch sequences is much faster now
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since we no longer do redundant unpacking and repacking of
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intermediate paths.</para></listitem>
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<listitem><para>Nix now uses Berkeley DB 4.3.</para></listitem>
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<listitem><para>The <function>derivation</function> primitive is
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lazier. Attributes of dependent derivations can mutually refer to
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each other (as long as there are no data dependencies on the
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<varname>outPath</varname> and <varname>drvPath</varname> attributes
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computed by <function>derivation</function>).</para>
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<para>For example, the expression <literal>derivation
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attrs</literal> now evaluates to (essentially)
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<programlisting>
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attrs // {
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type = "derivation";
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outPath = derivation! attrs;
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drvPath = derivation! attrs;
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}</programlisting>
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where <function>derivation!</function> is a primop that does the
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actual derivation instantiation (i.e., it does what
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<function>derivation</function> used to do). The advantage is that
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it allows commands such as <command>nix-env -qa</command> and
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<command>nix-env -i</command> to be much faster since they no longer
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need to instantiate all derivations, just the
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<varname>name</varname> attribute.</para>
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<para>Also, it allows derivations to cyclically reference each
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other, for example,
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<programlisting>
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webServer = derivation {
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...
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hostName = "svn.cs.uu.nl";
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services = [svnService];
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};
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svnService = derivation {
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...
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hostName = webServer.hostName;
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};</programlisting>
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Previously, this would yield a black hole (infinite recursion).</para>
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</listitem>
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<listitem><para><command>nix-build</command> now defaults to using
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<filename>./default.nix</filename> if no Nix expression is
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specified.</para></listitem>
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<listitem><para><command>nix-instantiate</command>, when applied to
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a Nix expression that evaluates to a function, will call the
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function automatically if all its arguments have
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defaults.</para></listitem>
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<listitem><para>Nix now uses libtool to build dynamic libraries.
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This reduces the size of executables.</para></listitem>
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<listitem><para>A new list concatenation operator
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<literal>++</literal>. For example, <literal>[1 2 3] ++ [4 5
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6]</literal> evaluates to <literal>[1 2 3 4 5
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6]</literal>.</para></listitem>
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<listitem><para>Some currently undocumented primops to support
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low-level build management using Nix (i.e., using Nix as a Make
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replacement). See the commit messages for <literal>r3578</literal>
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and <literal>r3580</literal>.</para></listitem>
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<listitem><para>Various bug fixes and performance
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improvements.</para></listitem>
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</itemizedlist>
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</chapter> |