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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-1.11">
<title>Release 1.11 (2016-01-19)</title>
<para>This is primarily a bug fix release. It also has a number of new
features:</para>
<itemizedlist>
<listitem>
<para><command>nix-prefetch-url</command> can now download URLs
specified in a Nix expression. For example,
<screen>
$ nix-prefetch-url -A hello.src
</screen>
will prefetch the file specified by the
<function>fetchurl</function> call in the attribute
<literal>hello.src</literal> from the Nix expression in the
current directory, and print the cryptographic hash of the
resulting file on stdout. This differs from <literal>nix-build -A
hello.src</literal> in that it doesn't verify the hash, and is
thus useful when you’re updating a Nix expression.</para>
<para>You can also prefetch the result of functions that unpack a
tarball, such as <function>fetchFromGitHub</function>. For example:
<screen>
$ nix-prefetch-url --unpack https://github.com/NixOS/patchelf/archive/0.8.tar.gz
</screen>
or from a Nix expression:
<screen>
$ nix-prefetch-url -A nix-repl.src
</screen>
</para>
</listitem>
<listitem>
<para>The builtin function
<function><nix/fetchurl.nix></function> now supports
downloading and unpacking NARs. This removes the need to have
multiple downloads in the Nixpkgs stdenv bootstrap process (like a
separate busybox binary for Linux, or curl/mkdir/sh/bzip2 for
Darwin). Now all those files can be combined into a single NAR,
optionally compressed using <command>xz</command>.</para>
</listitem>
<listitem>
<para>Nix now supports SHA-512 hashes for verifying fixed-output
derivations, and in <function>builtins.hashString</function>.</para>
</listitem>
<listitem>
<para>
The new flag <option>--option build-repeat
<emphasis>N</emphasis></option> will cause every build to
be executed <emphasis>N</emphasis>+1 times. If the build
output differs between any round, the build is rejected, and the
output paths are not registered as valid. This is primarily
useful to verify build determinism. (We already had a
<option>--check</option> option to repeat a previously succeeded
build. However, with <option>--check</option>, non-deterministic
builds are registered in the DB. Preventing that is useful for
Hydra to ensure that non-deterministic builds don't end up
getting published to the binary cache.)
</para>
</listitem>
<listitem>
<para>
The options <option>--check</option> and <option>--option
build-repeat <emphasis>N</emphasis></option>, if they
detect a difference between two runs of the same derivation and
<option>-K</option> is given, will make the output of the other
run available under
<filename><emphasis>store-path</emphasis>-check</filename>. This
makes it easier to investigate the non-determinism using tools
like <command>diffoscope</command>, e.g.,
<screen>
$ nix-build pkgs/stdenv/linux -A stage1.pkgs.zlib --check -K
error: derivation ‘/nix/store/l54i8wlw2265…-zlib-1.2.8.drv’ may not
be deterministic: output ‘/nix/store/11a27shh6n2i…-zlib-1.2.8’
differs from ‘/nix/store/11a27shh6n2i…-zlib-1.2.8-check’
$ diffoscope /nix/store/11a27shh6n2i…-zlib-1.2.8 /nix/store/11a27shh6n2i…-zlib-1.2.8-check
…
├── lib/libz.a
│ ├── metadata
│ │ @@ -1,15 +1,15 @@
│ │ -rw-r--r-- 30001/30000 3096 Jan 12 15:20 2016 adler32.o
…
│ │ +rw-r--r-- 30001/30000 3096 Jan 12 15:28 2016 adler32.o
…
</screen>
</para></listitem>
<listitem>
<para>Improved FreeBSD support.</para>
</listitem>
<listitem>
<para><command>nix-env -qa --xml --meta</command> now prints
license information.</para>
</listitem>
<listitem>
<para>The maximum number of parallel TCP connections that the
binary cache substituter will use has been decreased from 150 to
25. This should prevent upsetting some broken NAT routers, and
also improves performance.</para>
</listitem>
<listitem>
<para>All "chroot"-containing strings got renamed to "sandbox".
In particular, some Nix options got renamed, but the old names
are still accepted as lower-priority aliases.
</para>
</listitem>
</itemizedlist>
<para>This release has contributions from Anders Claesson, Anthony
Cowley, Bjørn Forsman, Brian McKenna, Danny Wilson, davidak, Eelco Dolstra,
Fabian Schmitthenner, FrankHB, Ilya Novoselov, janus, Jim Garrison, John
Ericson, Jude Taylor, Ludovic Courtès, Manuel Jacob, Mathnerd314,
Pascal Wittmann, Peter Simons, Philip Potter, Preston Bennes, Rommel
M. Martinez, Sander van der Burg, Shea Levy, Tim Cuthbertson, Tuomas
Tynkkynen, Utku Demir and Vladimír Čunát.</para>
</section>
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