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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="ssec-relnotes-1.1">
+
+<title>Release 1.1 (July 18, 2012)</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 =
+    <replaceable>url</replaceable>; sha256 =
+    "<replaceable>hash</replaceable>"; }</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>
+
+</chapter>
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