nixpkgs/nixos/doc/manual/release-notes/rl-1703.xml

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         xmlns:xlink="http://www.w3.org/1999/xlink"
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         version="5.0"
         xml:id="sec-release-17.03">

<title>Release 17.03 (“XXX”, 2017/03/??)</title>

<para>In addition to numerous new and upgraded packages, this release
has the following highlights: </para>

<itemizedlist>
  <listitem>
    <para>Nixpkgs is now extensible through overlays. See the <link
    xlink:href="https://nixos.org/nixpkgs/manual/#sec-overlays-install">Nixpkgs
    manual</link> for more information.</para>
  </listitem>
</itemizedlist>

<para>The following new services were added since the last release:</para>

<itemizedlist>
  <listitem>
    <para></para>
  </listitem>
</itemizedlist>


<para>When upgrading from a previous release, please be aware of the
following incompatible changes:</para>

<itemizedlist>
  <listitem>
    <para>
      <literal>stdenv.overrides</literal> is now expected to take <literal>self</literal>
      and <literal>super</literal> arguments. See <literal>lib.trivial.extends</literal>
      for what those parameters represent.
    </para>
  </listitem>

  <listitem>
    <para>
      <literal>gnome</literal> alias has been removed along with
      <literal>gtk</literal>, <literal>gtkmm</literal> and several others.
      Now you need to use versioned attributes, like <literal>gnome3</literal>.
    </para>
  </listitem>

  <listitem>
    <para>
      The attribute name of the Radicale daemon has been changed from
      <literal>pythonPackages.radicale</literal> to
      <literal>radicale</literal>.
    </para>
  </listitem>

  <listitem>
    <para>
      The Yama LSM is now enabled by default in the kernel,
      which prevents ptracing non-child processes.
      This means you will not be able to attach gdb to an existing process,
      but will need to start that process from gdb (so it is a child).
    </para>
  </listitem>

  <listitem>
    <para>
      The <literal>stripHash</literal> bash function in <literal>stdenv</literal>
      changed according to its documentation; it now outputs the stripped name to
      <literal>stdout</literal> instead of putting it in the variable
      <literal>strippedName</literal>.
    </para>
  </listitem>

  <listitem>
    <para>PHP now scans for extra configuration .ini files in /etc/php.d
    instead of /etc. This prevents accidentally loading non-PHP .ini files
    that may be in /etc.
    </para>
  </listitem>

  <listitem>
    <para>
      Parsoid service now uses YAML configuration format.
     <literal>service.parsoid.interwikis</literal> is now called
     <literal>service.parsoid.wikis</literal> and is a list of either API URLs
     or attribute sets as specified in parsoid's documentation.
    </para>
  </listitem>

  <listitem>
    <para>
     <literal>Ntpd</literal> was replaced by
     <literal>systemd-timesyncd</literal> as the default service to synchronize
     system time with a remote NTP server. The old behavior can be restored by
     setting <literal>services.ntp.enable</literal> to <literal>true</literal>.
     Upstream time servers for all NTP implementations are now configured using
     <literal>networking.timeServers</literal>.
   </para>
  </listitem>

  <listitem>

    <para><literal>overridePackages</literal> function no longer exists.
    It is replaced by <link
    xlink:href="https://nixos.org/nixpkgs/manual/#sec-overlays-install">
    overlays</link>.  For example, the following code:

<programlisting>
  let
    pkgs = import &lt;nixpkgs&gt; {};
  in
    pkgs.overridePackages (self: super: ...)
</programlisting>

    should be replaced by:

<programlisting>
  let
    pkgs = import &lt;nixpkgs&gt; {};
  in
    import pkgs.path { overlays = [(self: super: ...)] }
</programlisting>

    </para>
  </listitem>
</itemizedlist>


<para>Other notable improvements:</para>

<itemizedlist>
  <listitem>
    <para>Module type system have a new extensible option types feature that
      allow to extend certain types, such as enum, through multiple option
      declarations of the same option across multiple modules.
    </para>
  </listitem>
</itemizedlist>


</section>