<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="sec-release-14.04">
 <title>Release 14.04 (“Baboon”, 2014/04/30)</title>

 <para>
  This is the second stable release branch of NixOS. In addition to numerous
  new and upgraded packages and modules, this release has the following
  highlights:
  <itemizedlist>
   <listitem>
    <para>
     Installation on UEFI systems is now supported. See
     <xref linkend="sec-installation"/> for details.
    </para>
   </listitem>
   <listitem>
    <para>
     Systemd has been updated to version 212, which has
     <link xlink:href="http://cgit.freedesktop.org/systemd/systemd/plain/NEWS?id=v212">numerous
     improvements</link>. NixOS now automatically starts systemd user instances
     when you log in. You can define global user units through the
     <option>systemd.unit.*</option> options.
    </para>
   </listitem>
   <listitem>
    <para>
     NixOS is now based on Glibc 2.19 and GCC 4.8.
    </para>
   </listitem>
   <listitem>
    <para>
     The default Linux kernel has been updated to 3.12.
    </para>
   </listitem>
   <listitem>
    <para>
     KDE has been updated to 4.12.
    </para>
   </listitem>
   <listitem>
    <para>
     GNOME 3.10 experimental support has been added.
    </para>
   </listitem>
   <listitem>
    <para>
     Nix has been updated to 1.7
     (<link
  xlink:href="http://nixos.org/nix/manual/#ssec-relnotes-1.7">details</link>).
    </para>
   </listitem>
   <listitem>
    <para>
     NixOS now supports fully declarative management of users and groups. If
     you set <option>users.mutableUsers</option> to <literal>false</literal>,
     then the contents of <filename>/etc/passwd</filename> and
     <filename>/etc/group</filename> will be
     <link
  xlink:href="https://www.usenix.org/legacy/event/lisa02/tech/full_papers/traugott/traugott_html/">congruent</link>
     to your NixOS configuration. For instance, if you remove a user from
     <option>users.extraUsers</option> and run
     <command>nixos-rebuild</command>, the user account will cease to exist.
     Also, imperative commands for managing users and groups, such as
     <command>useradd</command>, are no longer available. If
     <option>users.mutableUsers</option> is <literal>true</literal> (the
     default), then behaviour is unchanged from NixOS 13.10.
    </para>
   </listitem>
   <listitem>
    <para>
     NixOS now has basic container support, meaning you can easily run a NixOS
     instance as a container in a NixOS host system. These containers are
     suitable for testing and experimentation but not production use, since
     they’re not fully isolated from the host. See
     <xref linkend="ch-containers"/> for details.
    </para>
   </listitem>
   <listitem>
    <para>
     Systemd units provided by packages can now be overridden from the NixOS
     configuration. For instance, if a package <literal>foo</literal> provides
     systemd units, you can say:
<programlisting>
systemd.packages = [ pkgs.foo ];
</programlisting>
     to enable those units. You can then set or override unit options in the
     usual way, e.g.
<programlisting>
systemd.services.foo.wantedBy = [ "multi-user.target" ];
systemd.services.foo.serviceConfig.MemoryLimit = "512M";
</programlisting>
    </para>
   </listitem>
  </itemizedlist>
 </para>

 <para>
  When upgrading from a previous release, please be aware of the following
  incompatible changes:
  <itemizedlist>
   <listitem>
    <para>
     Nixpkgs no longer exposes unfree packages by default. If your NixOS
     configuration requires unfree packages from Nixpkgs, you need to enable
     support for them explicitly by setting:
<programlisting>
nixpkgs.config.allowUnfree = true;
</programlisting>
     Otherwise, you get an error message such as:
<screen>
error: package ‘nvidia-x11-331.49-3.12.17’ in ‘…/nvidia-x11/default.nix:56’
  has an unfree license, refusing to evaluate
</screen>
    </para>
   </listitem>
   <listitem>
    <para>
     The Adobe Flash player is no longer enabled by default in the Firefox and
     Chromium wrappers. To enable it, you must set:
<programlisting>
nixpkgs.config.allowUnfree = true;
nixpkgs.config.firefox.enableAdobeFlash = true; # for Firefox
nixpkgs.config.chromium.enableAdobeFlash = true; # for Chromium
</programlisting>
    </para>
   </listitem>
   <listitem>
    <para>
     The firewall is now enabled by default. If you don’t want this, you need
     to disable it explicitly:
<programlisting>
networking.firewall.enable = false;
</programlisting>
    </para>
   </listitem>
   <listitem>
    <para>
     The option <option>boot.loader.grub.memtest86</option> has been renamed to
     <option>boot.loader.grub.memtest86.enable</option>.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>mysql55</literal> service has been merged into the
     <literal>mysql</literal> service, which no longer sets a default for the
     option <option>services.mysql.package</option>.
    </para>
   </listitem>
   <listitem>
    <para>
     Package variants are now differentiated by suffixing the name, rather than
     the version. For instance, <filename>sqlite-3.8.4.3-interactive</filename>
     is now called <filename>sqlite-interactive-3.8.4.3</filename>. This
     ensures that <literal>nix-env -i sqlite</literal> is unambiguous, and that
     <literal>nix-env -u</literal> won’t “upgrade”
     <literal>sqlite</literal> to <literal>sqlite-interactive</literal> or vice
     versa. Notably, this change affects the Firefox wrapper (which provides
     plugins), as it is now called <literal>firefox-wrapper</literal>. So when
     using <command>nix-env</command>, you should do <literal>nix-env -e
     firefox; nix-env -i firefox-wrapper</literal> if you want to keep using
     the wrapper. This change does not affect declarative package management,
     since attribute names like <literal>pkgs.firefoxWrapper</literal> were
     already unambiguous.
    </para>
   </listitem>
   <listitem>
    <para>
     The symlink <filename>/etc/ca-bundle.crt</filename> is gone. Programs
     should instead use the environment variable
     <envar>OPENSSL_X509_CERT_FILE</envar> (which points to
     <filename>/etc/ssl/certs/ca-bundle.crt</filename>).
    </para>
   </listitem>
  </itemizedlist>
 </para>
</section>
