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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-1.1">
-
-<title>Release 1.1 (2012-07-18)</title>
-
-<para>This release has the following improvements:</para>
-
-<itemizedlist>
-
- <listitem>
- <para>On Linux, when doing a chroot build, Nix now uses various
- namespace features provided by the Linux kernel to improve
- build isolation. Namely:
- <itemizedlist>
- <listitem><para>The private network namespace ensures that
- builders cannot talk to the outside world (or vice versa): each
- build only sees a private loopback interface. This also means
- that two concurrent builds can listen on the same port (e.g. as
- part of a test) without conflicting with each
- other.</para></listitem>
- <listitem><para>The PID namespace causes each build to start as
- PID 1. Processes outside of the chroot are not visible to those
- on the inside. On the other hand, processes inside the chroot
- <emphasis>are</emphasis> visible from the outside (though with
- different PIDs).</para></listitem>
- <listitem><para>The IPC namespace prevents the builder from
- communicating with outside processes using SysV IPC mechanisms
- (shared memory, message queues, semaphores). It also ensures
- that all IPC objects are destroyed when the builder
- exits.</para></listitem>
- <listitem><para>The UTS namespace ensures that builders see a
- hostname of <literal>localhost</literal> rather than the actual
- hostname.</para></listitem>
- <listitem><para>The private mount namespace was already used by
- Nix to ensure that the bind-mounts used to set up the chroot are
- cleaned up automatically.</para></listitem>
- </itemizedlist>
- </para>
- </listitem>
-
- <listitem>
- <para>Build logs are now compressed using
- <command>bzip2</command>. The command <command>nix-store
- -l</command> decompresses them on the fly. This can be disabled
- by setting the option <literal>build-compress-log</literal> to
- <literal>false</literal>.</para>
- </listitem>
-
- <listitem>
- <para>The creation of build logs in
- <filename>/nix/var/log/nix/drvs</filename> can be disabled by
- setting the new option <literal>build-keep-log</literal> to
- <literal>false</literal>. This is useful, for instance, for Hydra
- build machines.</para>
- </listitem>
-
- <listitem>
- <para>Nix now reserves some space in
- <filename>/nix/var/nix/db/reserved</filename> to ensure that the
- garbage collector can run successfully if the disk is full. This
- is necessary because SQLite transactions fail if the disk is
- full.</para>
- </listitem>
-
- <listitem>
- <para>Added a basic <function>fetchurl</function> function. This
- is not intended to replace the <function>fetchurl</function> in
- Nixpkgs, but is useful for bootstrapping; e.g., it will allow us
- to get rid of the bootstrap binaries in the Nixpkgs source tree
- and download them instead. You can use it by doing
- <literal>import &lt;nix/fetchurl.nix> { url =
- <emphasis>url</emphasis>; sha256 =
- "<emphasis>hash</emphasis>"; }</literal>. (Shea Levy)</para>
- </listitem>
-
- <listitem>
- <para>Improved RPM spec file. (Michel Alexandre Salim)</para>
- </listitem>
-
- <listitem>
- <para>Support for on-demand socket-based activation in the Nix
- daemon with <command>systemd</command>.</para>
- </listitem>
-
- <listitem>
- <para>Added a manpage for
- <citerefentry><refentrytitle>nix.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>.</para>
- </listitem>
-
- <listitem>
- <para>When using the Nix daemon, the <option>-s</option> flag in
- <command>nix-env -qa</command> is now much faster.</para>
- </listitem>
-
-</itemizedlist>
-
-</section>