<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-18.03">
 <title>Release 18.03 (“Impala”, 2018/04/04)</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-18.03-highlights">
  <title>Highlights</title>

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

  <itemizedlist>
   <listitem>
    <para>
     End of support is planned for end of October 2018, handing over to 18.09.
    </para>
   </listitem>
   <listitem>
    <para>
     Platform support: x86_64-linux and x86_64-darwin since release time (the
     latter isn't NixOS, really). Binaries for aarch64-linux are available, but
     no channel exists yet, as it's waiting for some test fixes, etc.
    </para>
   </listitem>
   <listitem>
    <para>
     Nix now defaults to 2.0; see its
     <link xlink:href="https://nixos.org/nix/manual/#ssec-relnotes-2.0">release
     notes</link>.
    </para>
   </listitem>
   <listitem>
    <para>
     Core version changes: linux: 4.9 -> 4.14, glibc: 2.25 -> 2.26, gcc: 6 ->
     7, systemd: 234 -> 237.
    </para>
   </listitem>
   <listitem>
    <para>
     Desktop version changes: gnome: 3.24 -> 3.26, (KDE) plasma-desktop: 5.10
     -> 5.12.
    </para>
   </listitem>
   <listitem>
    <para>
     MariaDB 10.2, updated from 10.1, is now the default MySQL implementation.
     While upgrading a few changes have been made to the infrastructure
     involved:
     <itemizedlist>
      <listitem>
       <para>
        <literal>libmysql</literal> has been deprecated, please use
        <literal>mysql.connector-c</literal> instead, a compatibility passthru
        has been added to the MySQL packages.
       </para>
      </listitem>
      <listitem>
       <para>
        The <literal>mysql57</literal> package has a new
        <literal>static</literal> output containing the static libraries
        including <literal>libmysqld.a</literal>
       </para>
      </listitem>
     </itemizedlist>
    </para>
   </listitem>
   <listitem>
    <para>
     PHP now defaults to PHP 7.2, updated from 7.1.
    </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-18.03-new-services">
  <title>New Services</title>

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

  <itemizedlist>
   <listitem>
    <para>
     <literal>./config/krb5/default.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./hardware/digitalbitbox.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./misc/label.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/ccache.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/criu.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/digitalbitbox/default.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/less.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/npm.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/plotinus.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/rootston.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/systemtap.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/sway.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/udevil.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/way-cooler.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/yabar.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./programs/zsh/zsh-autoenv.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/backup/borgbackup.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/backup/crashplan-small-business.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/desktops/dleyna-renderer.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/desktops/dleyna-server.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/desktops/pipewire.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/desktops/gnome3/chrome-gnome-shell.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/desktops/gnome3/tracker-miners.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/hardware/fwupd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/hardware/interception-tools.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/hardware/u2f.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/hardware/usbmuxd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/mail/clamsmtp.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/mail/dkimproxy-out.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/mail/pfix-srsd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/gitea.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/home-assistant.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/ihaskell.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/logkeys.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/novacomd.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/osrm.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/plexpy.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/pykms.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/misc/tzupdate.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/monitoring/fusion-inventory.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/monitoring/prometheus/exporters.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/network-filesystems/beegfs.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/network-filesystems/davfs2.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/network-filesystems/openafs/client.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/network-filesystems/openafs/server.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/network-filesystems/ceph.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/networking/aria2.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/networking/monero.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/networking/nghttpx/default.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/networking/nixops-dns.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/networking/rxe.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/networking/stunnel.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/web-apps/matomo.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/web-apps/restya-board.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/web-servers/mighttpd2.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./services/x11/fractalart.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./system/boot/binfmt.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./system/boot/grow-partition.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./tasks/filesystems/ecryptfs.nix</literal>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>./virtualisation/hyperv-guest.nix</literal>
    </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-18.03-incompatibilities">
  <title>Backward Incompatibilities</title>

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

  <itemizedlist>
   <listitem>
    <para>
     <literal>sound.enable</literal> now defaults to false.
    </para>
   </listitem>
   <listitem>
    <para>
     Dollar signs in options under <option>services.postfix</option> are passed
     verbatim to Postfix, which will interpret them as the beginning of a
     parameter expression. This was already true for string-valued options in
     the previous release, but not for list-valued options. If you need to pass
     literal dollar signs through Postfix, double them.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>postage</literal> package (for web-based PostgreSQL
     administration) has been renamed to <literal>pgmanage</literal>. The
     corresponding module has also been renamed. To migrate please rename all
     <option>services.postage</option> options to
     <option>services.pgmanage</option>.
    </para>
   </listitem>
   <listitem>
    <para>
     Package attributes starting with a digit have been prefixed with an
     underscore sign. This is to avoid quoting in the configuration and other
     issues with command-line tools like <literal>nix-env</literal>. The change
     affects the following packages:
     <itemizedlist>
      <listitem>
       <para>
        <literal>2048-in-terminal</literal> →
        <literal>_2048-in-terminal</literal>
       </para>
      </listitem>
      <listitem>
       <para>
        <literal>90secondportraits</literal> →
        <literal>_90secondportraits</literal>
       </para>
      </listitem>
      <listitem>
       <para>
        <literal>2bwm</literal> → <literal>_2bwm</literal>
       </para>
      </listitem>
      <listitem>
       <para>
        <literal>389-ds-base</literal> → <literal>_389-ds-base</literal>
       </para>
      </listitem>
     </itemizedlist>
    </para>
   </listitem>
   <listitem>
    <para>
     <emphasis role="strong"> The OpenSSH service no longer enables support for
     DSA keys by default, which could cause a system lock out. Update your keys
     or, unfavorably, re-enable DSA support manually. </emphasis>
    </para>
    <para>
     DSA support was
     <link xlink:href="https://www.openssh.com/legacy.html">deprecated in
     OpenSSH 7.0</link>, due to it being too weak. To re-enable support, add
     <literal>PubkeyAcceptedKeyTypes +ssh-dss</literal> to the end of your
     <option>services.openssh.extraConfig</option>.
    </para>
    <para>
     After updating the keys to be stronger, anyone still on a pre-17.03
     version is safe to jump to 17.03, as vetted
     <link xlink:href="https://search.nix.gsc.io/?q=stateVersion">here</link>.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>openssh</literal> package now includes Kerberos support by
     default; the <literal>openssh_with_kerberos</literal> package is now a
     deprecated alias. If you do not want Kerberos support, you can do
     <literal>openssh.override { withKerberos = false; }</literal>. Note, this
     also applies to the <literal>openssh_hpn</literal> package.
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>cc-wrapper</literal> has been split in two; there is now also a
     <literal>bintools-wrapper</literal>. The most commonly used files in
     <filename>nix-support</filename> are now split between the two wrappers.
     Some commonly used ones, like
     <filename>nix-support/dynamic-linker</filename>, are duplicated for
     backwards compatability, even though they rightly belong only in
     <literal>bintools-wrapper</literal>. Other more obscure ones are just
     moved.
    </para>
   </listitem>
   <listitem>
    <para>
     The propagation logic has been changed. The new logic, along with new
     types of dependencies that go with, is thoroughly documented in the
     "Specifying dependencies" section of the "Standard Environment" chapter of
     the nixpkgs manual.
<!-- That's <xref linkend="ssec-stdenv-attributes"> were we to merge the manuals. -->
     The old logic isn't but is easy to describe: dependencies were propagated
     as the same type of dependency no matter what. In practice, that means
     that many <function>propagatedNativeBuildInputs</function> should instead
     be <function>propagatedBuildInputs</function>. Thankfully, that was and is
     the least used type of dependency. Also, it means that some
     <function>propagatedBuildInputs</function> should instead be
     <function>depsTargetTargetPropagated</function>. Other types dependencies
     should be unaffected.
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>lib.addPassthru drv passthru</literal> is removed. Use
     <literal>lib.extendDerivation true passthru drv</literal> instead.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>memcached</literal> service no longer accept dynamic socket
     paths via <option>services.memcached.socket</option>. Unix sockets can be
     still enabled by <option>services.memcached.enableUnixSocket</option> and
     will be accessible at <literal>/run/memcached/memcached.sock</literal>.
    </para>
   </listitem>
   <listitem>
    <para>
     The <varname>hardware.amdHybridGraphics.disable</varname> option was
     removed for lack of a maintainer. If you still need this module, you may
     wish to include a copy of it from an older version of nixos in your
     imports.
    </para>
   </listitem>
   <listitem>
    <para>
     The merging of config options for
     <varname>services.postfix.config</varname> was buggy. Previously, if other
     options in the Postfix module like
     <varname>services.postfix.useSrs</varname> were set and the user set
     config options that were also set by such options, the resulting config
     wouldn't include all options that were needed. They are now merged
     correctly. If config options need to be overridden,
     <literal>lib.mkForce</literal> or <literal>lib.mkOverride</literal> can be
     used.
    </para>
   </listitem>
   <listitem>
    <para>
     The following changes apply if the <literal>stateVersion</literal> is
     changed to 18.03 or higher. For <literal>stateVersion = "17.09"</literal>
     or lower the old behavior is preserved.
    </para>
    <itemizedlist>
     <listitem>
      <para>
       <literal>matrix-synapse</literal> uses postgresql by default instead of
       sqlite. Migration instructions can be found
       <link xlink:href="https://github.com/matrix-org/synapse/blob/master/docs/postgres.rst#porting-from-sqlite">
       here </link>.
      </para>
     </listitem>
    </itemizedlist>
   </listitem>
   <listitem>
    <para>
     The <literal>jid</literal> package has been removed, due to maintenance
     overhead of a go package having non-versioned dependencies.
    </para>
   </listitem>
   <listitem>
    <para>
     When using <option>services.xserver.libinput</option> (enabled by default
     in GNOME), it now handles all input devices, not just touchpads. As a
     result, you might need to re-evaluate any custom Xorg configuration. In
     particular, <literal>Option "XkbRules" "base"</literal> may result in
     broken keyboard layout.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>attic</literal> package was removed. A maintained fork called
     <link xlink:href="https://www.borgbackup.org/">Borg</link> should be used
     instead. Migration instructions can be found
     <link xlink:href="http://borgbackup.readthedocs.io/en/stable/usage/upgrade.html#attic-and-borg-0-xx-to-borg-1-x">here</link>.
    </para>
   </listitem>
   <listitem>
    <para>
     The Piwik analytics software was renamed to Matomo:
     <itemizedlist>
      <listitem>
       <para>
        The package <literal>pkgs.piwik</literal> was renamed to
        <literal>pkgs.matomo</literal>.
       </para>
      </listitem>
      <listitem>
       <para>
        The service <literal>services.piwik</literal> was renamed to
        <literal>services.matomo</literal>.
       </para>
      </listitem>
      <listitem>
       <para>
        The data directory <filename>/var/lib/piwik</filename> was renamed to
        <filename>/var/lib/matomo</filename>. All files will be moved
        automatically on first startup, but you might need to adjust your
        backup scripts.
       </para>
      </listitem>
      <listitem>
       <para>
        The default <option>serverName</option> for the nginx configuration
        changed from <literal>piwik.${config.networking.hostName}</literal> to
        <literal>matomo.${config.networking.hostName}.${config.networking.domain}</literal>
        if <option>config.networking.domain</option> is set,
        <literal>matomo.${config.networking.hostName}</literal> if it is not
        set. If you change your <option>serverName</option>, remember you'll
        need to update the <literal>trustedHosts[]</literal> array in
        <filename>/var/lib/matomo/config/config.ini.php</filename> as well.
       </para>
      </listitem>
      <listitem>
       <para>
        The <literal>piwik</literal> user was renamed to
        <literal>matomo</literal>. The service will adjust ownership
        automatically for files in the data directory. If you use unix socket
        authentication, remember to give the new <literal>matomo</literal> user
        access to the database and to change the <literal>username</literal> to
        <literal>matomo</literal> in the <literal>[database]</literal> section
        of <filename>/var/lib/matomo/config/config.ini.php</filename>.
       </para>
      </listitem>
      <listitem>
       <para>
        If you named your database `piwik`, you might want to rename it to
        `matomo` to keep things clean, but this is neither enforced nor
        required.
       </para>
      </listitem>
     </itemizedlist>
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>nodejs-4_x</literal> is end-of-life.
     <literal>nodejs-4_x</literal>, <literal>nodejs-slim-4_x</literal> and
     <literal>nodePackages_4_x</literal> are removed.
    </para>
   </listitem>
   <listitem>
    <para>
     The <literal>pump.io</literal> NixOS module was removed. It is now
     maintained as an
     <link xlink:href="https://github.com/rvl/pump.io-nixos">external
     module</link>.
    </para>
   </listitem>
   <listitem>
    <para>
     The Prosody XMPP server has received a major update. The following modules
     were renamed:
     <itemizedlist>
      <listitem>
       <para>
        <option>services.prosody.modules.httpserver</option> is now
        <option>services.prosody.modules.http_files</option>
       </para>
      </listitem>
      <listitem>
       <para>
        <option>services.prosody.modules.console</option> is now
        <option>services.prosody.modules.admin_telnet</option>
       </para>
      </listitem>
     </itemizedlist>
    </para>
    <para>
     Many new modules are now core modules, most notably
     <option>services.prosody.modules.carbons</option> and
     <option>services.prosody.modules.mam</option>.
    </para>
    <para>
     The better-performing <literal>libevent</literal> backend is now enabled
     by default.
    </para>
    <para>
     <literal>withCommunityModules</literal> now passes through the modules to
     <option>services.prosody.extraModules</option>. Use
     <literal>withOnlyInstalledCommunityModules</literal> for modules that
     should not be enabled directly, e.g <literal>lib_ldap</literal>.
    </para>
   </listitem>
   <listitem>
    <para>
     All prometheus exporter modules are now defined as submodules. The
     exporters are configured using
     <literal>services.prometheus.exporters</literal>.
    </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-18.03-notable-changes">
  <title>Other Notable Changes</title>

  <itemizedlist>
   <listitem>
    <para>
     ZNC option <option>services.znc.mutable</option> now defaults to
     <literal>true</literal>. That means that old configuration is not
     overwritten by default when update to the znc options are made.
    </para>
   </listitem>
   <listitem>
    <para>
     The option <option>networking.wireless.networks.&lt;name&gt;.auth</option>
     has been added for wireless networks with WPA-Enterprise authentication.
     There is also a new <option>extraConfig</option> option to directly
     configure <literal>wpa_supplicant</literal> and <option>hidden</option> to
     connect to hidden networks.
    </para>
   </listitem>
   <listitem>
    <para>
     In the module <option>networking.interfaces.&lt;name&gt;</option> the
     following options have been removed:
     <itemizedlist>
      <listitem>
       <para>
        <option>ipAddress</option>
       </para>
      </listitem>
      <listitem>
       <para>
        <option>ipv6Address</option>
       </para>
      </listitem>
      <listitem>
       <para>
        <option>prefixLength</option>
       </para>
      </listitem>
      <listitem>
       <para>
        <option>ipv6PrefixLength</option>
       </para>
      </listitem>
      <listitem>
       <para>
        <option>subnetMask</option>
       </para>
      </listitem>
     </itemizedlist>
     To assign static addresses to an interface the options
     <option>ipv4.addresses</option> and <option>ipv6.addresses</option> should
     be used instead. The options <option>ip4</option> and <option>ip6</option>
     have been renamed to <option>ipv4.addresses</option>
     <option>ipv6.addresses</option> respectively. The new options
     <option>ipv4.routes</option> and <option>ipv6.routes</option> have been
     added to set up static routing.
    </para>
   </listitem>
   <listitem>
    <para>
     The option <option>services.logstash.listenAddress</option> is now
     <literal>127.0.0.1</literal> by default. Previously the default behaviour
     was to listen on all interfaces.
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>services.btrfs.autoScrub</literal> has been added, to
     periodically check btrfs filesystems for data corruption. If there's a
     correct copy available, it will automatically repair corrupted blocks.
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>displayManager.lightdm.greeters.gtk.clock-format.</literal> has
     been added, the clock format string (as expected by strftime, e.g.
     <literal>%H:%M</literal>) to use with the lightdm gtk greeter panel.
    </para>
    <para>
     If set to null the default clock format is used.
    </para>
   </listitem>
   <listitem>
    <para>
     <literal>displayManager.lightdm.greeters.gtk.indicators</literal> has been
     added, a list of allowed indicator modules to use with the lightdm gtk
     greeter panel.
    </para>
    <para>
     Built-in indicators include <literal>~a11y</literal>,
     <literal>~language</literal>, <literal>~session</literal>,
     <literal>~power</literal>, <literal>~clock</literal>,
     <literal>~host</literal>, <literal>~spacer</literal>. Unity indicators can
     be represented by short name (e.g. <literal>sound</literal>,
     <literal>power</literal>), service file name, or absolute path.
    </para>
    <para>
     If set to <literal>null</literal> the default indicators are used.
    </para>
    <para>
     In order to have the previous default configuration add
<programlisting>
  services.xserver.displayManager.lightdm.greeters.gtk.indicators = [
    "~host" "~spacer"
    "~clock" "~spacer"
    "~session"
    "~language"
    "~a11y"
    "~power"
  ];
</programlisting>
     to your <literal>configuration.nix</literal>.
    </para>
   </listitem>
   <listitem>
    <para>
     The NixOS test driver supports user services declared by
     <literal>systemd.user.services</literal>. The methods
     <literal>waitForUnit</literal>, <literal>getUnitInfo</literal>,
     <literal>startJob</literal> and <literal>stopJob</literal> provide an
     optional <literal>$user</literal> argument for that purpose.
    </para>
   </listitem>
   <listitem>
    <para>
     Enabling bash completion on NixOS,
     <literal>programs.bash.enableCompletion</literal>, will now also enable
     completion for the Nix command line tools by installing the
     <link xlink:href="https://github.com/hedning/nix-bash-completions">nix-bash-completions</link>
     package.
    </para>
   </listitem>
  </itemizedlist>
 </section>
</section>
