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-<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="https://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>