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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="ssec-relnotes-2.3">
<title>Release 2.3 (2019-08-??)</title>
<para>This is primarily a bug fix release. However, it makes some
incompatible changes:</para>
<itemizedlist>
<listitem>
<para>Nix now uses BSD file locks instead of POSIX file
locks. Since previous releases used POSIX file locks, you should
not use Nix 2.2 and previous releases at the same time on a Nix
store.</para>
</listitem>
</itemizedlist>
<para>It also has the following changes:</para>
<itemizedlist>
<listitem>
<para><function>builtins.fetchGit</function>'s <varname>ref</varname>
argument now allows specifying an absolute remote ref.
Nix will automatically prefix <varname>ref</varname> with
<literal>refs/heads</literal> only if <varname>ref</varname> doesn't
already begin with <literal>refs/</literal>.
</para>
</listitem>
<listitem>
<para>The installer now enables sandboxing by default on
Linux. The <literal>max-jobs</literal> setting now defaults to
1.</para>
</listitem>
<listitem>
<para>New builtin functions:
<literal>builtins.isPath</literal>,
<literal>builtins.hashFile</literal>.
</para>
</listitem>
<listitem>
<para><command>nix</command>: Add
<option>--print-build-logs</option> (<option>-L</option>) flag to
print build log output to stderr rather than showing the last log
line in the progress bar. To distinguish between concurrent
builds, log lines are prefixed by the name of the package.
</para>
</listitem>
<listitem>
<para>Builds are now executed in a pseudo-terminal, and the
<envar>TERM</envar> evnironment variable is set to
<literal>xterm-256color</literal>. This allows many programs
(e.g. <command>gcc</command>, <command>clang</command>,
<command>cmake</command>) to print colorized log output.</para>
</listitem>
<listitem>
<para>Add <option>--no-net</option> convenience flag. This flag
disables substituters; sets the <literal>tarball-ttl</literal>
setting to infinity (ensuring that any previously downloaded files
are considered current); and disables retrying downloads and sets
the connection timeout to the minimum. This flag is enabled
automatically if there are no configured non-loopback network
interfaces.</para>
</listitem>
<listitem>
<para>Add a <literal>post-build-hook</literal> setting to run a
program after a build has succeeded.</para>
</listitem>
<listitem>
<para>Add a <literal>trace-function-calls</literal> setting to log
the duration of Nix function calls to stderr.</para>
</listitem>
<listitem>
<para>On Linux, sandboxing is now disabled by default on systems
that don’t have the necessary kernel support.</para>
</listitem>
</itemizedlist>
</section>
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