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