<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-20.03">
 <title>Release 20.03 (“Markhor”, 2020.03/??)</title>

 <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-20.03-highlights">
  <title>Highlights</title>

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

  <itemizedlist>
   <listitem>
    <para>
     Support is planned until the end of October 2020, handing over to 20.09.
    </para>
   </listitem>
   <listitem>
    <para>
     Postgresql for NixOS service now defaults to v11.
    </para>
   </listitem>
   <listitem>
    <para>
     The graphical installer image starts the graphical session automatically.
     Before you'd be greeted by a tty and asked to enter <command>systemctl start display-manager</command>.
     It is now possible to disable the display-manager from running by selecting the <literal>Disable display-manager</literal>
     quirk in the boot menu.
    </para>
   </listitem>
   <listitem>
     <para>
       By default zfs pools will now be trimmed on a weekly basis.
       Trimming is only done on supported devices (i.e. NVME or SSDs)
       and should improve throughput and lifetime of these devices.
       It is controlled by the <varname>services.zfs.trim.enable</varname> varname.
       The zfs scrub service (<varname>services.zfs.autoScrub.enable</varname>)
       and the zfs autosnapshot service (<varname>services.zfs.autoSnapshot.enable</varname>)
       are now only enabled if zfs is set in <varname>config.boot.initrd.supportedFilesystems</varname> or
       <varname>config.boot.supportedFilesystems</varname>. These lists will automatically contain
       zfs as soon as any zfs mountpoint is configured in <varname>fileSystems</varname>.
     </para>
   </listitem>
   <listitem>
    <para>
      <command>nixos-option</command> has been rewritten in C++, speeding it up, improving correctness,
      and adding a <option>--all</option> option which prints all options and their values.
    </para>
   </listitem>
   <listitem>
    <para>
     <option>services.xserver.desktopManager.default</option> and <option>services.xserver.windowManager.default</option> options were replaced by a single <xref linkend="opt-services.xserver.displayManager.defaultSession"/> option to improve support for upstream session files. If you used something like:
<programlisting>
services.xserver.desktopManager.default = "xfce";
services.xserver.windowManager.default = "icewm";
</programlisting>
     you should change it to:
<programlisting>
services.xserver.displayManager.defaultSession = "xfce+icewm";
</programlisting>
    </para>
   </listitem>
  </itemizedlist>
 </section>

 <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-20.03-new-services">
  <title>New Services</title>

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

  <itemizedlist>
   <listitem>
    <para>
    The kubernetes kube-proxy now supports a new hostname configuration
    <literal>services.kubernetes.proxy.hostname</literal> which has to
    be set if the hostname of the node should be non default.
    </para>
   </listitem>
   <listitem>
    <para>
    UPower's configuration is now managed by NixOS and can be customized
    via <option>services.upower</option>.
    </para>
   </listitem>
  </itemizedlist>

 </section>

 <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-20.03-incompatibilities">
  <title>Backward Incompatibilities</title>

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

  <itemizedlist>
   <listitem>
    <para>
      GnuPG is now built without support for a graphical passphrase entry
      by default. Please enable the <literal>gpg-agent</literal> user service
      via the NixOS option <literal>programs.gnupg.agent.enable</literal>.
      Note that upstream recommends using <literal>gpg-agent</literal> and
      will spawn a <literal>gpg-agent</literal> on the first invocation of
      GnuPG anyway.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>dynamicHosts</literal> option has been removed from the
     <link linkend="opt-networking.networkmanager.enable">networkd</link>
     module. Allowing (multiple) regular users to override host entries
     affecting the whole system opens up a huge attack vector.
     There seem to be very rare cases where this might be useful.
     Consider setting system-wide host entries using
     <link linkend="opt-networking.hosts">networking.hosts</link>, provide
     them via the DNS server in your network, or use
     <link linkend="opt-environment.etc">environment.etc</link>
     to add a file into <literal>/etc/NetworkManager/dnsmasq.d</literal>
     reconfiguring <literal>hostsdir</literal>.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>99-main.network</literal> file was removed. Maching all
     network interfaces caused many breakages, see
     <link xlink:href="https://github.com/NixOS/nixpkgs/pull/18962">#18962</link>
       and <link xlink:href="https://github.com/NixOS/nixpkgs/pull/71106">#71106</link>.
    </para>
    <para>
     We already don't support the global <link linkend="opt-networking.useDHCP">networking.useDHCP</link>,
     <link linkend="opt-networking.defaultGateway">networking.defaultGateway</link> and
     <link linkend="opt-networking.defaultGateway6">networking.defaultGateway6</link> options
     if <link linkend="opt-networking.useNetworkd">networking.useNetworkd</link> is enabled,
     but direct users to configure the per-device
     <link linkend="opt-networking.interfaces">networking.interfaces.&lt;name&gt;.…</link> options.
    </para>
   </listitem>
   <listitem>
    <para>
      The stdenv now runs all bash with <literal>set -u</literal>, to catch the use of undefined variables.
      Before, it itself used <literal>set -u</literal> but was careful to unset it so other packages' code ran as before.
      Now, all bash code is held to the same high standard, and the rather complex stateful manipulation of the options can be discarded.
    </para>
   </listitem>
   <listitem>
    <para>
     The SLIM Display Manager has been removed, as it has been unmaintained since 2013.
     Consider migrating to a different display manager such as LightDM (current default in NixOS),
     SDDM, GDM, or using the startx module which uses Xinitrc.
    </para>
   </listitem>
   <listitem>
    <para>
      The BEAM package set has been deleted. You will only find there the different interpreters.
      You should now use the different build tools coming with the languages with sandbox mode disabled.
    </para>
   </listitem>
   <listitem>
    <para>
     There is now only one Xfce package-set and module. This means attributes, <literal>xfce4-14</literal>
     <literal>xfce4-12</literal>, and <literal>xfceUnstable</literal> all now point to the latest Xfce 4.14
     packages. And in future NixOS releases will be the latest released version of Xfce available at the
     time during the releases development (if viable).
    </para>
   </listitem>
   <listitem>
    <para>
      The <link linkend="opt-services.phpfpm.pools">phpfpm</link> module now sets
      <literal>PrivateTmp=true</literal> in its systemd units for better process isolation.
      If you rely on <literal>/tmp</literal> being shared with other services, explicitly override this by
      setting <literal>serviceConfig.PrivateTmp</literal> to <literal>false</literal> for each phpfpm unit.
    </para>
   </listitem>
   <listitem>
    <para>
     KDE’s old multimedia framework Phonon no longer supports Qt 4. For that reason, Plasma desktop also does not have <option>enableQt4Support</option> option any more.
    </para>
   </listitem>
   <listitem>
    <para>
     The BeeGFS module has been removed.
    </para>
   </listitem>
   <listitem>
    <para>
     The osquery module has been removed.
    </para>
   </listitem>
   <listitem>
    <para>
      Going forward, <literal>~/bin</literal> in the users home directory will no longer be in <literal>PATH</literal> by default.
      If you depend on this you should set the option <literal>environment.homeBinInPath</literal> to <literal>true</literal>.
      The aforementioned option was added this release.
    </para>
   </listitem>
   <listitem>
    <para>
      The <literal>buildRustCrate</literal> infrastructure now produces <literal>lib</literal> outputs in addition to the <literal>out</literal> output.
      This has led to drastically reduced closed sizes for some rust crates since development dependencies are now in the <literal>lib</literal> output.
    </para>
    </listitem>
   <listitem>
    <para>
     Pango was upgraded to 1.44, which no longer uses freetype for font loading.  This means that type1
     and bitmap fonts are no longer supported in applications relying on Pango for font rendering
     (notably, GTK application). See <link xlink:href="https://gitlab.gnome.org/GNOME/pango/issues/386">
     upstream issue</link> for more information.
    </para>
   </listitem>
   <listitem>
    <para>
     The packages <literal>openobex</literal> and <literal>obexftp</literal>
     are no longer installed when enabling Bluetooth via
     <option>hardware.bluetooth.enable</option>.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>dump1090</literal> derivation has been changed to use FlightAware's dump1090
     as its upstream. However, this version does not have an internal webserver anymore. The
     assets in the <literal>share/dump1090</literal> directory of the derivation can be used
     in conjunction with an external webserver to replace this functionality.
    </para>
   </listitem>
   <listitem>
    <para>
     The fourStore and fourStoreEndpoint modules have been removed.
    </para>
   </listitem>
   <listitem>
    <para>
     Polkit no longer has the user of uid 0 (root) as an admin identity.
     We now follow the upstream default of only having every member of the wheel
     group admin privileged. Before it was root and members of wheel.
     The positive outcome of this is pkexec GUI popups or terminal prompts
     will no longer require the user to choose between two essentially equivalent
     choices (whether to perform the action as themselves with wheel permissions, or as the root user).
    </para>
   </listitem>
   <listitem>
    <para>
     NixOS containers no longer build NixOS manual by default. This saves evaluation time,
     especially if there are many declarative containers defined. Note that this is already done
     when <literal>&lt;nixos/modules/profiles/minimal.nix&gt;</literal> module is included
     in container config.
    </para>
   </listitem>
   <listitem>
    <para>
     Virtual console options have been reorganized and can be found under
     a single top-level attribute: <literal>console</literal>.
     The full set of changes is as follows:
    </para>
    <itemizedlist>
      <listitem>
       <para>
         <literal>i18n.consoleFont</literal> renamed to
         <link linkend="opt-console.font">console.font</link>
       </para>
      </listitem>
      <listitem>
       <para>
         <literal>i18n.consoleKeyMap</literal> renamed to
         <link linkend="opt-console.keyMap">console.keyMap</link>
       </para>
      </listitem>
      <listitem>
       <para>
         <literal>i18n.consoleColors</literal> renamed to
         <link linkend="opt-console.colors">console.colors</link>
       </para>
      </listitem>
      <listitem>
       <para>
         <literal>i18n.consolePackages</literal> renamed to
         <link linkend="opt-console.packages">console.packages</link>
       </para>
      </listitem>
      <listitem>
       <para>
         <literal>i18n.consoleUseXkbConfig</literal> renamed to
         <link linkend="opt-console.useXkbConfig">console.useXkbConfig</link>
       </para>
      </listitem>
      <listitem>
       <para>
         <literal>boot.earlyVconsoleSetup</literal> renamed to
         <link linkend="opt-console.earlySetup">console.earlySetup</link>
       </para>
      </listitem>
      <listitem>
       <para>
         <literal>boot.extraTTYs</literal> renamed to
         <link linkend="opt-console.extraTTYs">console.extraTTYs</link>
       </para>
      </listitem>
    </itemizedlist>
   </listitem>
  </itemizedlist>
 </section>

 <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-20.03-notable-changes">
  <title>Other Notable Changes</title>

  <itemizedlist>
   <listitem>
     <para>SD images are now compressed by default using <literal>bzip2</literal>.</para>
   </listitem>
   <listitem>
    <para>
     The nginx web server previously started its master process as root
     privileged, then ran worker processes as a less privileged identity user.
     This was changed to start all of nginx as a less privileged user (defined by
     <literal>services.nginx.user</literal> and
     <literal>services.nginx.group</literal>). As a consequence, all files that
     are needed for nginx to run (included configuration fragments, SSL
     certificates and keys, etc.) must now be readable by this less privileged
     user/group.
    </para>
   </listitem>
   <listitem>
    <para>
     OpenSSH has been upgraded from 7.9 to 8.1, improving security and adding features
     but with potential incompatibilities.  Consult the
     <link xlink:href="https://www.openssh.com/txt/release-8.1">
     release announcement</link> for more information.
    </para>
   </listitem>
   <listitem>
     <para>
       <literal>PRETTY_NAME</literal> in <literal>/etc/os-release</literal>
       now uses the short rather than full version string.
     </para>
   </listitem>
  </itemizedlist>
 </section>
</section>
