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