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lix/doc/manual/release-notes/rl-2.3.xml

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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">
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<title>Release 2.3 (2019-09-04)</title>
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<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
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locks. Because of this, you should not use Nix 2.3 and previous
releases at the same time on a Nix store.</para>
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</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>
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<listitem>
<para>The installer now enables sandboxing by default on Linux when the
system has the necessary kernel support.
</para>
</listitem>
<listitem>
<para>The <literal>max-jobs</literal> setting now defaults to 1.</para>
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</listitem>
<listitem>
<para>New builtin functions:
<literal>builtins.isPath</literal>,
<literal>builtins.hashFile</literal>.
</para>
</listitem>
<listitem>
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<para>The <command>nix</command> command has a new
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<option>--print-build-logs</option> (<option>-L</option>) flag to
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print build log output to stderr, rather than showing the last log
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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
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<envar>TERM</envar> environment variable is set to
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<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>
</itemizedlist>
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</section>