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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-1.6.0">
-
-<title>Release 1.6 (2013-09-10)</title>
-
-<para>In addition to the usual bug fixes, this release has several new
-features:</para>
-
-<itemizedlist>
-
- <listitem>
- <para>The command <command>nix-build --run-env</command> has been
- renamed to <command>nix-shell</command>.</para>
- </listitem>
-
- <listitem>
- <para><command>nix-shell</command> now sources
- <filename>$stdenv/setup</filename> <emphasis>inside</emphasis> the
- interactive shell, rather than in a parent shell. This ensures
- that shell functions defined by <literal>stdenv</literal> can be
- used in the interactive shell.</para>
- </listitem>
-
- <listitem>
- <para><command>nix-shell</command> has a new flag
- <option>--pure</option> to clear the environment, so you get an
- environment that more closely corresponds to the “real” Nix build.
- </para>
- </listitem>
-
- <listitem>
- <para><command>nix-shell</command> now sets the shell prompt
- (<envar>PS1</envar>) to ensure that Nix shells are distinguishable
- from your regular shells.</para>
- </listitem>
-
- <listitem>
- <para><command>nix-env</command> no longer requires a
- <literal>*</literal> argument to match all packages, so
- <literal>nix-env -qa</literal> is equivalent to <literal>nix-env
- -qa '*'</literal>.</para>
- </listitem>
-
- <listitem>
- <para><command>nix-env -i</command> has a new flag
- <option>--remove-all</option> (<option>-r</option>) to remove all
- previous packages from the profile. This makes it easier to do
- declarative package management similar to NixOS’s
- <option>environment.systemPackages</option>. For instance, if you
- have a specification <filename>my-packages.nix</filename> like this:
-
-<programlisting>
-with import &lt;nixpkgs> {};
-[ thunderbird
- geeqie
- ...
-]
-</programlisting>
-
- then after any change to this file, you can run:
-
-<screen>
-$ nix-env -f my-packages.nix -ir
-</screen>
-
- to update your profile to match the specification.</para>
- </listitem>
-
- <listitem>
- <para>The ‘<literal>with</literal>’ language construct is now more
- lazy. It only evaluates its argument if a variable might actually
- refer to an attribute in the argument. For instance, this now
- works:
-
-<programlisting>
-let
- pkgs = with pkgs; { foo = "old"; bar = foo; } // overrides;
- overrides = { foo = "new"; };
-in pkgs.bar
-</programlisting>
-
- This evaluates to <literal>"new"</literal>, while previously it
- gave an “infinite recursion” error.</para>
- </listitem>
-
- <listitem>
- <para>Nix now has proper integer arithmetic operators. For
- instance, you can write <literal>x + y</literal> instead of
- <literal>builtins.add x y</literal>, or <literal>x &lt;
- y</literal> instead of <literal>builtins.lessThan x y</literal>.
- The comparison operators also work on strings.</para>
- </listitem>
-
- <listitem>
- <para>On 64-bit systems, Nix integers are now 64 bits rather than
- 32 bits.</para>
- </listitem>
-
- <listitem>
- <para>When using the Nix daemon, the <command>nix-daemon</command>
- worker process now runs on the same CPU as the client, on systems
- that support setting CPU affinity. This gives a significant speedup
- on some systems.</para>
- </listitem>
-
- <listitem>
- <para>If a stack overflow occurs in the Nix evaluator, you now get
- a proper error message (rather than “Segmentation fault”) on some
- systems.</para>
- </listitem>
-
- <listitem>
- <para>In addition to directories, you can now bind-mount regular
- files in chroots through the (now misnamed) option
- <option>build-chroot-dirs</option>.</para>
- </listitem>
-
-</itemizedlist>
-
-<para>This release has contributions from Domen Kožar, Eelco Dolstra,
-Florian Friesdorf, Gergely Risko, Ivan Kozik, Ludovic Courtès and Shea
-Levy.</para>
-
-</section>