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<h1 id="release-111-2016-01-19">Release 1.11 (2016-01-19)</h1>
<p>This is primarily a bug fix release. It also has a number of new
features:</p>
<ul>
<li>
<p><code>nix-prefetch-url</code> can now download URLs specified in a Nix
expression. For example,</p>
<div class="highlight"><pre><span></span><code>$ nix-prefetch-url -A hello.src
</code></pre></div>
<p>will prefetch the file specified by the <code>fetchurl</code> call in the
attribute <code>hello.src</code> from the Nix expression in the current
directory, and print the cryptographic hash of the resulting file on
stdout. This differs from <code>nix-build -A
hello.src</code> in that it doesn't verify the hash, and is thus useful
when youre updating a Nix expression.</p>
<p>You can also prefetch the result of functions that unpack a tarball,
such as <code>fetchFromGitHub</code>. For example:</p>
<div class="highlight"><pre><span></span><code>$ nix-prefetch-url --unpack https://github.com/NixOS/patchelf/archive/0.8.tar.gz
</code></pre></div>
<p>or from a Nix expression:</p>
<div class="highlight"><pre><span></span><code>$ nix-prefetch-url -A nix-repl.src
</code></pre></div>
</li>
<li>
<p>The builtin function <code>&lt;nix/fetchurl.nix&gt;</code> 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
<code>xz</code>.</p>
</li>
<li>
<p>Nix now supports SHA-512 hashes for verifying fixed-output
derivations, and in <code>builtins.hashString</code>.</p>
</li>
<li>
<p>The new flag <code>--option build-repeat
N</code> will cause every build to be executed <em>N</em>+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 <code>--check</code> option to
repeat a previously succeeded build. However, with <code>--check</code>,
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.)</p>
</li>
<li>
<p>The options <code>--check</code> and <code>--option
build-repeat N</code>, if they detect a difference between two runs of the
same derivation and <code>-K</code> is given, will make the output of the other
run available under <code>store-path-check</code>. This makes it easier to
investigate the non-determinism using tools like <code>diffoscope</code>, e.g.,</p>
<div class="highlight"><pre><span></span><code>$ 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
</code></pre></div>
</li>
<li>
<p>Improved FreeBSD support.</p>
</li>
<li>
<p><code>nix-env -qa --xml --meta</code> now prints license information.</p>
</li>
<li>
<p>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.</p>
</li>
<li>
<p>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.</p>
</li>
</ul>
<p>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.</p>
</article>
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