<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-16.03">
 <title>Release 16.03 (“Emu”, 2016/03/31)</title>

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

 <itemizedlist>
  <listitem>
   <para>
    Systemd 229, bringing
    <link
    xlink:href="https://github.com/systemd/systemd/blob/v229/NEWS">numerous
    improvements</link> over 217.
   </para>
  </listitem>
  <listitem>
   <para>
    Linux 4.4 (was 3.18).
   </para>
  </listitem>
  <listitem>
   <para>
    GCC 5.3 (was 4.9). Note that GCC 5
    <link
    xlink:href="https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_dual_abi.html">changes
    the C++ ABI in an incompatible way</link>; this may cause problems if you
    try to link objects compiled with different versions of GCC.
   </para>
  </listitem>
  <listitem>
   <para>
    Glibc 2.23 (was 2.21).
   </para>
  </listitem>
  <listitem>
   <para>
    Binutils 2.26 (was 2.23.1). See #909
   </para>
  </listitem>
  <listitem>
   <para>
    Improved support for ensuring
    <link
    xlink:href="https://reproducible-builds.org/">bitwise
    reproducible builds</link>. For example, <literal>stdenv</literal> now sets
    the environment variable
    <envar
    xlink:href="https://reproducible-builds.org/specs/source-date-epoch/">SOURCE_DATE_EPOCH</envar>
    to a deterministic value, and Nix has
    <link
    xlink:href="http://nixos.org/nix/manual/#ssec-relnotes-1.11">gained
    an option</link> to repeat a build a number of times to test determinism.
    An ongoing project, the goal of exact reproducibility is to allow binaries
    to be verified independently (e.g., a user might only trust binaries that
    appear in three independent binary caches).
   </para>
  </listitem>
  <listitem>
   <para>
    Perl 5.22.
   </para>
  </listitem>
 </itemizedlist>

 <para>
  The following new services were added since the last release:
  <itemizedlist>
   <listitem>
    <para>
     <literal>services/monitoring/longview.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>hardware/video/webcam/facetimehd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>i18n/input-method/default.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>i18n/input-method/fcitx.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>i18n/input-method/ibus.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>i18n/input-method/nabi.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>i18n/input-method/uim.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>programs/fish.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>security/acme.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>security/audit.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>security/oath.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/hardware/irqbalance.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/mail/dspam.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/mail/opendkim.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/mail/postsrsd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/mail/rspamd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/mail/rmilter.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/autofs.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/bepasty.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/calibre-server.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/cfdyndns.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/gammu-smsd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/mathics.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/matrix-synapse.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/misc/octoprint.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/monitoring/hdaps.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/monitoring/heapster.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/monitoring/longview.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/network-filesystems/netatalk.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/network-filesystems/xtreemfs.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/autossh.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/dnschain.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/gale.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/miniupnpd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/namecoind.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/ostinato.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/pdnsd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/shairport-sync.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/networking/supplicant.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/search/kibana.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/security/haka.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/security/physlock.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/web-apps/pump.io.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/x11/hardware/libinput.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services/x11/window-managers/windowlab.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>system/boot/initrd-network.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>system/boot/initrd-ssh.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>system/boot/loader/loader.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>system/boot/networkd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>system/boot/resolved.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>virtualisation/lxd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>virtualisation/rkt.nix</literal>
    </para>
   </listitem>
  </itemizedlist>
 </para>

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

 <itemizedlist>
  <listitem>
   <para>
    We no longer produce graphical ISO images and VirtualBox images for
    <literal>i686-linux</literal>. A minimal ISO image is still provided.
   </para>
  </listitem>
  <listitem>
   <para>
    Firefox and similar browsers are now <emphasis>wrapped by
    default</emphasis>. The package and attribute names are plain
    <literal>firefox</literal> or <literal>midori</literal>, etc.
    Backward-compatibility attributes were set up, but note that
    <command>nix-env -u</command> will <emphasis>not</emphasis> update your
    current <literal>firefox-with-plugins</literal>; you have to uninstall it
    and install <literal>firefox</literal> instead.
   </para>
  </listitem>
  <listitem>
   <para>
    <command>wmiiSnap</command> has been replaced with
    <command>wmii_hg</command>, but
    <command>services.xserver.windowManager.wmii.enable</command> has been
    updated respectively so this only affects you if you have explicitly
    installed <command>wmiiSnap</command>.
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>jobs</literal> NixOS option has been removed. It served as
    compatibility layer between Upstart jobs and SystemD services. All services
    have been rewritten to use <literal>systemd.services</literal>
   </para>
  </listitem>
  <listitem>
   <para>
    <command>wmiimenu</command> is removed, as it has been removed by the
    developers upstream. Use <command>wimenu</command> from the
    <command>wmii-hg</command> package.
   </para>
  </listitem>
  <listitem>
   <para>
    Gitit is no longer automatically added to the module list in NixOS and as
    such there will not be any manual entries for it. You will need to add an
    import statement to your NixOS configuration in order to use it, e.g.
<programlisting><![CDATA[
{
  imports = [ <nixpkgs/nixos/modules/services/misc/gitit.nix> ];
}
]]></programlisting>
    will include the Gitit service configuration options.
   </para>
  </listitem>
  <listitem>
   <para>
    <command>nginx</command> does not accept flags for enabling and disabling
    modules anymore. Instead it accepts <literal>modules</literal> argument,
    which is a list of modules to be built in. All modules now reside in
    <literal>nginxModules</literal> set. Example configuration:
<programlisting><![CDATA[
nginx.override {
  modules = [ nginxModules.rtmp nginxModules.dav nginxModules.moreheaders ];
}
]]></programlisting>
   </para>
  </listitem>
  <listitem>
   <para>
    <command>s3sync</command> is removed, as it hasn't been developed by
    upstream for 4 years and only runs with ruby 1.8. For an actively-developer
    alternative look at <command>tarsnap</command> and others.
   </para>
  </listitem>
  <listitem>
   <para>
    <command>ruby_1_8</command> has been removed as it's not supported from
    upstream anymore and probably contains security issues.
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>tidy-html5</literal> package is removed. Upstream only provided
    <literal>(lib)tidy5</literal> during development, and now they went back to
    <literal>(lib)tidy</literal> to work as a drop-in replacement of the
    original package that has been unmaintained for years. You can (still) use
    the <literal>html-tidy</literal> package, which got updated to a stable
    release from this new upstream.
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>extraDeviceOptions</literal> argument is removed from
    <literal>bumblebee</literal> package. Instead there are now two separate
    arguments: <literal>extraNvidiaDeviceOptions</literal> and
    <literal>extraNouveauDeviceOptions</literal> for setting extra X11 options
    for nvidia and nouveau drivers, respectively.
   </para>
  </listitem>
  <listitem>
   <para>
    The <literal>Ctrl+Alt+Backspace</literal> key combination no longer kills
    the X server by default. There's a new option
    <option>services.xserver.enableCtrlAltBackspace</option> allowing to enable
    the combination again.
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>emacsPackagesNg</literal> now contains all packages from the ELPA,
    MELPA, and MELPA Stable repositories.
   </para>
  </listitem>
  <listitem>
   <para>
    Data directory for Postfix MTA server is moved from
    <filename>/var/postfix</filename> to <filename>/var/lib/postfix</filename>.
    Old configurations are migrated automatically.
    <literal>service.postfix</literal> module has also received many
    improvements, such as correct directories' access rights, new
    <literal>aliasFiles</literal> and <literal>mapFiles</literal> options and
    more.
   </para>
  </listitem>
  <listitem>
   <para>
    Filesystem options should now be configured as a list of strings, not a
    comma-separated string. The old style will continue to work, but print a
    warning, until the 16.09 release. An example of the new style:
<programlisting>
fileSystems."/example" = {
  device = "/dev/sdc";
  fsType = "btrfs";
  options = [ "noatime" "compress=lzo" "space_cache" "autodefrag" ];
};
</programlisting>
   </para>
  </listitem>
  <listitem>
   <para>
    CUPS, installed by <literal>services.printing</literal> module, now has its
    data directory in <filename>/var/lib/cups</filename>. Old configurations
    from <filename>/etc/cups</filename> are moved there automatically, but
    there might be problems. Also configuration options
    <literal>services.printing.cupsdConf</literal> and
    <literal>services.printing.cupsdFilesConf</literal> were removed because
    they had been allowing one to override configuration variables required for
    CUPS to work at all on NixOS. For most use cases,
    <literal>services.printing.extraConf</literal> and new option
    <literal>services.printing.extraFilesConf</literal> should be enough; if
    you encounter a situation when they are not, please file a bug.
   </para>
   <para>
    There are also Gutenprint improvements; in particular, a new option
    <literal>services.printing.gutenprint</literal> is added to enable
    automatic updating of Gutenprint PPMs; it's greatly recommended to enable
    it instead of adding <literal>gutenprint</literal> to the
    <literal>drivers</literal> list.
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>services.xserver.vaapiDrivers</literal> has been removed. Use
    <literal>hardware.opengl.extraPackages{,32}</literal> instead. You can also
    specify VDPAU drivers there.
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>programs.ibus</literal> moved to
    <literal>i18n.inputMethod.ibus</literal>. The option
    <literal>programs.ibus.plugins</literal> changed to
    <literal>i18n.inputMethod.ibus.engines</literal> and the option to enable
    ibus changed from <literal>programs.ibus.enable</literal> to
    <literal>i18n.inputMethod.enabled</literal>.
    <literal>i18n.inputMethod.enabled</literal> should be set to the used input
    method name, <literal>"ibus"</literal> for ibus. An example of the new
    style:
<programlisting>
i18n.inputMethod.enabled = "ibus";
i18n.inputMethod.ibus.engines = with pkgs.ibus-engines; [ anthy mozc ];
</programlisting>
    That is equivalent to the old version:
<programlisting>
programs.ibus.enable = true;
programs.ibus.plugins = with pkgs; [ ibus-anthy mozc ];
</programlisting>
   </para>
  </listitem>
  <listitem>
   <para>
    <literal>services.udev.extraRules</literal> option now writes rules to
    <filename>99-local.rules</filename> instead of
    <filename>10-local.rules</filename>. This makes all the user rules apply
    after others, so their results wouldn't be overriden by anything else.
   </para>
  </listitem>
  <listitem>
   <para>
    Large parts of the <literal>services.gitlab</literal> module has been been
    rewritten. There are new configuration options available. The
    <literal>stateDir</literal> option was renamned to
    <literal>statePath</literal> and the <literal>satellitesDir</literal>
    option was removed. Please review the currently available options.
   </para>
  </listitem>
  <listitem>
   <para>
    The option <option>services.nsd.zones.&lt;name&gt;.data</option> no longer
    interpret the dollar sign ($) as a shell variable, as such it should not be
    escaped anymore. Thus the following zone data:
   </para>
<programlisting>
\$ORIGIN example.com.
\$TTL 1800
@       IN      SOA     ns1.vpn.nbp.name.      admin.example.com. (
    </programlisting>
   <para>
    Should modified to look like the actual file expected by nsd:
   </para>
<programlisting>
$ORIGIN example.com.
$TTL 1800
@       IN      SOA     ns1.vpn.nbp.name.      admin.example.com. (
    </programlisting>
  </listitem>
  <listitem>
   <para>
    <literal>service.syncthing.dataDir</literal> options now has to point to
    exact folder where syncthing is writing to. Example configuration should
    look something like:
   </para>
<programlisting>
services.syncthing = {
    enable = true;
    dataDir = "/home/somebody/.syncthing";
    user = "somebody";
};
    </programlisting>
  </listitem>
  <listitem>
   <para>
    <literal>networking.firewall.allowPing</literal> is now enabled by default.
    Users are encouraged to configure an appropriate rate limit for their
    machines using the Kernel interface at
    <filename>/proc/sys/net/ipv4/icmp_ratelimit</filename> and
    <filename>/proc/sys/net/ipv6/icmp/ratelimit</filename> or using the
    firewall itself, i.e. by setting the NixOS option
    <literal>networking.firewall.pingLimit</literal>.
   </para>
  </listitem>
  <listitem>
   <para>
    Systems with some broadcom cards used to result into a generated config
    that is no longer accepted. If you get errors like
<screen>error: path ‘/nix/store/*-broadcom-sta-*’ does not exist and cannot be created</screen>
    you should either re-run <command>nixos-generate-config</command> or
    manually replace
    <literal>"${config.boot.kernelPackages.broadcom_sta}"</literal> by
    <literal>config.boot.kernelPackages.broadcom_sta</literal> in your
    <filename>/etc/nixos/hardware-configuration.nix</filename>. More discussion
    is on <link xlink:href="https://github.com/NixOS/nixpkgs/pull/12595"> the
    github issue</link>.
   </para>
  </listitem>
  <listitem>
   <para>
    The <literal>services.xserver.startGnuPGAgent</literal> option has been
    removed. GnuPG 2.1.x changed the way the gpg-agent works, and that new
    approach no longer requires (or even supports) the "start everything as a
    child of the agent" scheme we've implemented in NixOS for older versions.
    To configure the gpg-agent for your X session, add the following code to
    <filename>~/.bashrc</filename> or some file that’s sourced when your
    shell is started:
<programlisting>
GPG_TTY=$(tty)
export GPG_TTY
    </programlisting>
    If you want to use gpg-agent for SSH, too, add the following to your
    session initialization (e.g.
    <literal>displayManager.sessionCommands</literal>)
<programlisting>
gpg-connect-agent /bye
unset SSH_AGENT_PID
export SSH_AUTH_SOCK="''${HOME}/.gnupg/S.gpg-agent.ssh"
    </programlisting>
    and make sure that
<programlisting>
enable-ssh-support
    </programlisting>
    is included in your <filename>~/.gnupg/gpg-agent.conf</filename>. You will
    need to use <command>ssh-add</command> to re-add your ssh keys. If gpg’s
    automatic transformation of the private keys to the new format fails, you
    will need to re-import your private keyring as well:
<programlisting>
gpg --import ~/.gnupg/secring.gpg
    </programlisting>
    The <command>gpg-agent(1)</command> man page has more details about this
    subject, i.e. in the "EXAMPLES" section.
   </para>
  </listitem>
 </itemizedlist>

 <para>
  Other notable improvements:
  <itemizedlist>
<!--
  <listitem>
    <para>The <command>command-not-found</command> hook was extended.
    Apart from <literal>$NIX_AUTO_INSTALL</literal> variable,
    it newly also checks for <literal>$NIX_AUTO_RUN</literal>
    which causes it to directly run the missing commands via
    <command>nix-shell</command> (without installing anything).</para>
  </listitem>
  -->
   <listitem>
    <para>
     <literal>ejabberd</literal> module is brought back and now works on NixOS.
    </para>
   </listitem>
   <listitem>
    <para>
     Input method support was improved. New NixOS modules (fcitx, nabi and
     uim), fcitx engines (chewing, hangul, m17n, mozc and table-other) and ibus
     engines (hangul and m17n) have been added.
    </para>
   </listitem>
  </itemizedlist>
 </para>
</section>
