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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-17.09">
+ <title>Release 17.09 (“Hummingbird”, 2017/09/??)</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-17.09-highlights">
+ <title>Highlights</title>
+
+ <para>
+ In addition to numerous new and upgraded packages, this release has the
+ following highlights:
+ </para>
+
+ <itemizedlist>
+ <listitem>
+ <para>
+ The GNOME version is now 3.24. KDE Plasma was upgraded to 5.10, KDE
+ Applications to 17.08.1 and KDE Frameworks to 5.37.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The user handling now keeps track of deallocated UIDs/GIDs. When a user or
+ group is revived, this allows it to be allocated the UID/GID it had
+ before. A consequence is that UIDs and GIDs are no longer reused.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The module option <option>services.xserver.xrandrHeads</option> now causes
+ the first head specified in this list to be set as the primary head. Apart
+ from that, it's now possible to also set additional options by using an
+ attribute set, for example:
+<programlisting>
+{ services.xserver.xrandrHeads = [
+ "HDMI-0"
+ {
+ output = &quot;DVI-0&quot;;
+ primary = true;
+ monitorConfig = ''
+ Option &quot;Rotate&quot; &quot;right&quot;
+ '';
+ }
+ ];
+}
+</programlisting>
+ This will set the <literal>DVI-0</literal> output to be the primary head,
+ even though <literal>HDMI-0</literal> is the first head in the list.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The handling of SSL in the <literal>services.nginx</literal> module has
+ been cleaned up, renaming the misnamed <literal>enableSSL</literal> to
+ <literal>onlySSL</literal> which reflects its original intention. This is
+ not to be used with the already existing <literal>forceSSL</literal> which
+ creates a second non-SSL virtual host redirecting to the SSL virtual host.
+ This by chance had worked earlier due to specific implementation details.
+ In case you had specified both please remove the
+ <literal>enableSSL</literal> option to keep the previous behaviour.
+ </para>
+ <para>
+ Another <literal>addSSL</literal> option has been introduced to configure
+ both a non-SSL virtual host and an SSL virtual host with the same
+ configuration.
+ </para>
+ <para>
+ Options to configure <literal>resolver</literal> options and
+ <literal>upstream</literal> blocks have been introduced. See their
+ information for further details.
+ </para>
+ <para>
+ The <literal>port</literal> option has been replaced by a more generic
+ <literal>listen</literal> option which makes it possible to specify
+ multiple addresses, ports and SSL configs dependant on the new SSL
+ handling mentioned above.
+ </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-17.09-new-services">
+ <title>New Services</title>
+
+ <para>
+ The following new services were added since the last release:
+ </para>
+
+ <itemizedlist>
+ <listitem>
+ <para>
+ <literal>config/fonts/fontconfig-penultimate.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>config/fonts/fontconfig-ultimate.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>config/terminfo.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>hardware/sensor/iio.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>hardware/nitrokey.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>hardware/raid/hpsa.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>programs/browserpass.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>programs/gnupg.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>programs/qt5ct.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>programs/slock.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>programs/thefuck.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>security/auditd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>security/lock-kernel-modules.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>service-managers/docker.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>service-managers/trivial.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/admin/salt/master.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/admin/salt/minion.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/audio/slimserver.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/cluster/kubernetes/default.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/cluster/kubernetes/dns.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/cluster/kubernetes/dashboard.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/continuous-integration/hail.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/databases/clickhouse.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/databases/postage.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/desktops/gnome3/gnome-disks.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/desktops/gnome3/gpaste.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/logging/SystemdJournal2Gelf.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/logging/heartbeat.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/logging/journalwatch.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/logging/syslogd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/mail/mailhog.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/mail/nullmailer.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/airsonic.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/autorandr.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/exhibitor.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/fstrim.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/gollum.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/irkerd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/jackett.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/radarr.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/misc/snapper.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/monitoring/osquery.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/monitoring/prometheus/collectd-exporter.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/monitoring/prometheus/fritzbox-exporter.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/network-filesystems/kbfs.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/dnscache.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/fireqos.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/iwd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/keepalived/default.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/keybase.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/lldpd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/matterbridge.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/squid.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/tinydns.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/networking/xrdp.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/security/shibboleth-sp.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/security/sks.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/security/sshguard.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/security/torify.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/security/usbguard.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/security/vault.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/system/earlyoom.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/system/saslauthd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/web-apps/nexus.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/web-apps/pgpkeyserver-lite.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/web-apps/piwik.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/web-servers/lighttpd/collectd.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/web-servers/minio.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/x11/display-managers/xpra.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services/x11/xautolock.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>tasks/filesystems/bcachefs.nix</literal>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>tasks/powertop.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-17.09-incompatibilities">
+ <title>Backward Incompatibilities</title>
+
+ <para>
+ When upgrading from a previous release, please be aware of the following
+ incompatible changes:
+ </para>
+
+ <itemizedlist>
+ <listitem>
+ <para>
+ <emphasis role="strong"> In an Qemu-based virtualization environment, the
+ network interface names changed from i.e. <literal>enp0s3</literal> to
+ <literal>ens3</literal>. </emphasis>
+ </para>
+ <para>
+ This is due to a kernel configuration change. The new naming is consistent
+ with those of other Linux distributions with systemd. See
+ <link xlink:href="https://github.com/NixOS/nixpkgs/issues/29197">#29197</link>
+ for more information.
+ </para>
+ <para>
+ A machine is affected if the <literal>virt-what</literal> tool either
+ returns <literal>qemu</literal> or <literal>kvm</literal>
+ <emphasis>and</emphasis> has interface names used in any part of its NixOS
+ configuration, in particular if a static network configuration with
+ <literal>networking.interfaces</literal> is used.
+ </para>
+ <para>
+ Before rebooting affected machines, please ensure:
+ <itemizedlist>
+ <listitem>
+ <para>
+ Change the interface names in your NixOS configuration. The first
+ interface will be called <literal>ens3</literal>, the second one
+ <literal>ens8</literal> and starting from there incremented by 1.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ After changing the interface names, rebuild your system with
+ <literal>nixos-rebuild boot</literal> to activate the new configuration
+ after a reboot. If you switch to the new configuration right away you
+ might lose network connectivity! If using <literal>nixops</literal>,
+ deploy with <literal>nixops deploy --force-reboot</literal>.
+ </para>
+ </listitem>
+ </itemizedlist>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The following changes apply if the <literal>stateVersion</literal> is
+ changed to 17.09 or higher. For <literal>stateVersion = "17.03"</literal>
+ or lower the old behavior is preserved.
+ </para>
+ <itemizedlist>
+ <listitem>
+ <para>
+ The <literal>postgres</literal> default version was changed from 9.5 to
+ 9.6.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>postgres</literal> superuser name has changed from
+ <literal>root</literal> to <literal>postgres</literal> to more closely
+ follow what other Linux distributions are doing.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>postgres</literal> default <literal>dataDir</literal> has
+ changed from <literal>/var/db/postgres</literal> to
+ <literal>/var/lib/postgresql/$psqlSchema</literal> where $psqlSchema is
+ 9.6 for example.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>mysql</literal> default <literal>dataDir</literal> has
+ changed from <literal>/var/mysql</literal> to
+ <literal>/var/lib/mysql</literal>.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Radicale's default package has changed from 1.x to 2.x. Instructions to
+ migrate can be found <link xlink:href="http://radicale.org/1to2/"> here
+ </link>. It is also possible to use the newer version by setting the
+ <literal>package</literal> to <literal>radicale2</literal>, which is
+ done automatically when <literal>stateVersion</literal> is 17.09 or
+ higher. The <literal>extraArgs</literal> option has been added to allow
+ passing the data migration arguments specified in the instructions; see
+ the
+ <filename xlink:href="https://github.com/NixOS/nixpkgs/blob/master/nixos/tests/radicale.nix">radicale.nix</filename>
+ NixOS test for an example migration.
+ </para>
+ </listitem>
+ </itemizedlist>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>aiccu</literal> package was removed. This is due to SixXS
+ <link xlink:href="https://www.sixxs.net/main/"> sunsetting</link> its IPv6
+ tunnel.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>fanctl</literal> package and <literal>fan</literal> module
+ have been removed due to the developers not upstreaming their iproute2
+ patches and lagging with compatibility to recent iproute2 versions.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Top-level <literal>idea</literal> package collection was renamed. All
+ JetBrains IDEs are now at <literal>jetbrains</literal>.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>flexget</literal>'s state database cannot be upgraded to its new
+ internal format, requiring removal of any existing
+ <literal>db-config.sqlite</literal> which will be automatically recreated.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>ipfs</literal> service now doesn't ignore the
+ <literal>dataDir</literal> option anymore. If you've ever set this option
+ to anything other than the default you'll have to either unset it (so the
+ default gets used) or migrate the old data manually with
+<programlisting>
+dataDir=&lt;valueOfDataDir&gt;
+mv /var/lib/ipfs/.ipfs/* $dataDir
+rmdir /var/lib/ipfs/.ipfs
+</programlisting>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>caddy</literal> service was previously using an extra
+ <literal>.caddy</literal> directory in the data directory specified with
+ the <literal>dataDir</literal> option. The contents of the
+ <literal>.caddy</literal> directory are now expected to be in the
+ <literal>dataDir</literal>.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>ssh-agent</literal> user service is not started by default
+ anymore. Use <literal>programs.ssh.startAgent</literal> to enable it if
+ needed. There is also a new <literal>programs.gnupg.agent</literal> module
+ that creates a <literal>gpg-agent</literal> user service. It can also
+ serve as a SSH agent if <literal>enableSSHSupport</literal> is set.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>services.tinc.networks.&lt;name&gt;.listenAddress</literal>
+ option had a misleading name that did not correspond to its behavior. It
+ now correctly defines the ip to listen for incoming connections on. To
+ keep the previous behaviour, use
+ <literal>services.tinc.networks.&lt;name&gt;.bindToAddress</literal>
+ instead. Refer to the description of the options for more details.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>tlsdate</literal> package and module were removed. This is due to
+ the project being dead and not building with openssl 1.1.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>wvdial</literal> package and module were removed. This is due to
+ the project being dead and not building with openssl 1.1.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>cc-wrapper</literal>'s setup-hook now exports a number of
+ environment variables corresponding to binutils binaries, (e.g.
+ <envar>LD</envar>, <envar>STRIP</envar>, <envar>RANLIB</envar>, etc). This
+ is done to prevent packages' build systems guessing, which is harder to
+ predict, especially when cross-compiling. However, some packages have
+ broken due to this—their build systems either not supporting, or
+ claiming to support without adequate testing, taking such environment
+ variables as parameters.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services.firefox.syncserver</literal> now runs by default as a
+ non-root user. To accomodate this change, the default sqlite database
+ location has also been changed. Migration should work automatically. Refer
+ to the description of the options for more details.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>compiz</literal> window manager and package was removed. The
+ system support had been broken for several years.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Touchpad support should now be enabled through <literal>libinput</literal>
+ as <literal>synaptics</literal> is now deprecated. See the option
+ <literal>services.xserver.libinput.enable</literal>.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ grsecurity/PaX support has been dropped, following upstream's decision to
+ cease free support. See
+ <link xlink:href="https://grsecurity.net/passing_the_baton.php">
+ upstream's announcement</link> for more information. No complete
+ replacement for grsecurity/PaX is available presently.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services.mysql</literal> now has declarative configuration of
+ databases and users with the <literal>ensureDatabases</literal> and
+ <literal>ensureUsers</literal> options.
+ </para>
+ <para>
+ These options will never delete existing databases and users, especially
+ not when the value of the options are changed.
+ </para>
+ <para>
+ The MySQL users will be identified using
+ <link xlink:href="https://mariadb.com/kb/en/library/authentication-plugin-unix-socket/">
+ Unix socket authentication</link>. This authenticates the Unix user with
+ the same name only, and that without the need for a password.
+ </para>
+ <para>
+ If you have previously created a MySQL <literal>root</literal> user
+ <emphasis>with a password</emphasis>, you will need to add
+ <literal>root</literal> user for unix socket authentication before using
+ the new options. This can be done by running the following SQL script:
+<programlisting language="sql">
+CREATE USER 'root'@'%' IDENTIFIED BY '';
+GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
+FLUSH PRIVILEGES;
+
+-- Optionally, delete the password-authenticated user:
+-- DROP USER 'root'@'localhost';
+</programlisting>
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services.mysqlBackup</literal> now works by default without any
+ user setup, including for users other than <literal>mysql</literal>.
+ </para>
+ <para>
+ By default, the <literal>mysql</literal> user is no longer the user which
+ performs the backup. Instead a system account
+ <literal>mysqlbackup</literal> is used.
+ </para>
+ <para>
+ The <literal>mysqlBackup</literal> service is also now using systemd
+ timers instead of <literal>cron</literal>.
+ </para>
+ <para>
+ Therefore, the <literal>services.mysqlBackup.period</literal> option no
+ longer exists, and has been replaced with
+ <literal>services.mysqlBackup.calendar</literal>, which is in the format
+ of
+ <link
+ xlink:href="https://www.freedesktop.org/software/systemd/man/systemd.time.html#Calendar%20Events">systemd.time(7)</link>.
+ </para>
+ <para>
+ If you expect to be sent an e-mail when the backup fails, consider using a
+ script which monitors the systemd journal for errors. Regretfully, at
+ present there is no built-in functionality for this.
+ </para>
+ <para>
+ You can check that backups still work by running <command>systemctl start
+ mysql-backup</command> then <command>systemctl status
+ mysql-backup</command>.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Templated systemd services e.g <literal>container@name</literal> are now
+ handled currectly when switching to a new configuration, resulting in them
+ being reloaded.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Steam: the <literal>newStdcpp</literal> parameter was removed and should
+ not be needed anymore.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Redis has been updated to version 4 which mandates a cluster mass-restart,
+ due to changes in the network handling, in order to ensure compatibility
+ with networks NATing traffic.
+ </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-17.09-notable-changes">
+ <title>Other Notable Changes</title>
+
+ <itemizedlist>
+ <listitem>
+ <para>
+ Modules can now be disabled by using
+ <link
+ xlink:href="https://nixos.org/nixpkgs/manual/#sec-replace-modules">
+ disabledModules</link>, allowing another to take it's place. This can be
+ used to import a set of modules from another channel while keeping the
+ rest of the system on a stable release.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Updated to FreeType 2.7.1, including a new TrueType engine. The new engine
+ replaces the Infinality engine which was the default in NixOS. The default
+ font rendering settings are now provided by fontconfig-penultimate,
+ replacing fontconfig-ultimate; the new defaults are less invasive and
+ provide rendering that is more consistent with other systems and hopefully
+ with each font designer's intent. Some system-wide configuration has been
+ removed from the Fontconfig NixOS module where user Fontconfig settings
+ are available.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ ZFS/SPL have been updated to 0.7.0, <literal>zfsUnstable,
+ splUnstable</literal> have therefore been removed.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <option>time.timeZone</option> option now allows the value
+ <literal>null</literal> in addition to timezone strings. This value allows
+ changing the timezone of a system imperatively using <command>timedatectl
+ set-timezone</command>. The default timezone is still UTC.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Nixpkgs overlays may now be specified with a file as well as a directory.
+ The value of <literal>&lt;nixpkgs-overlays></literal> may be a file, and
+ <filename>~/.config/nixpkgs/overlays.nix</filename> can be used instead of
+ the <filename>~/.config/nixpkgs/overlays</filename> directory.
+ </para>
+ <para>
+ See the overlays chapter of the Nixpkgs manual for more details.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Definitions for <filename>/etc/hosts</filename> can now be specified
+ declaratively with <literal>networking.hosts</literal>.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Two new options have been added to the installer loader, in addition to
+ the default having changed. The kernel log verbosity has been lowered to
+ the upstream default for the default options, in order to not spam the
+ console when e.g. joining a network.
+ </para>
+ <para>
+ This therefore leads to adding a new <literal>debug</literal> option to
+ set the log level to the previous verbose mode, to make debugging easier,
+ but still accessible easily.
+ </para>
+ <para>
+ Additionally a <literal>copytoram</literal> option has been added, which
+ makes it possible to remove the install medium after booting. This allows
+ tethering from your phone after booting from it.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services.gitlab-runner.configOptions</literal> has been added to
+ specify the configuration of gitlab-runners declaratively.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services.jenkins.plugins</literal> has been added to install
+ plugins easily, this can be generated with jenkinsPlugins2nix.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <literal>services.postfix.config</literal> has been added to specify the
+ main.cf with NixOS options. Additionally other options have been added to
+ the postfix module and has been improved further.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The GitLab package and module have been updated to the latest 10.0
+ release.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The <literal>systemd-boot</literal> boot loader now lists the NixOS
+ version, kernel version and build date of all bootable generations.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ The dnscrypt-proxy service now defaults to using a random upstream
+ resolver, selected from the list of public non-logging resolvers with
+ DNSSEC support. Existing configurations can be migrated to this mode of
+ operation by omitting the
+ <option>services.dnscrypt-proxy.resolverName</option> option or setting it
+ to <literal>"random"</literal>.
+ </para>
+ </listitem>
+ </itemizedlist>
+ </section>
+</section>