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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-unstable">
<title>Unstable</title>
<para>In addition to numerous new and upgraded packages, this release
has the following highlights:</para>
<itemizedlist>
<listitem>
<para>You can now pin a specific version of NixOS in your <filename>configuration.nix</filename>
by setting:
<programlisting>
nixos.path = ./nixpkgs-unstable-2015-12-06/nixos;
</programlisting>
This will make NixOS re-evaluate your configuration with the modules of
the specified NixOS version at the given path. For more details, see
<xref linkend="module-misc-nixos" /></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.
More discussion is <link xlink:href="https://github.com/NixOS/nixpkgs/pull/12299">
on the PR</link>. </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>services/web-apps/pump.io.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><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 = [ <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>
</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>
</itemizedlist></para>
</section>
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