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<h1 id="release-19-2015-06-12">Release 1.9 (2015-06-12)</h1>
<p>In addition to the usual bug fixes, this release has the following new
features:</p>
<ul>
<li>
<p>Signed binary cache support. You can enable signature checking by
adding the following to <code>nix.conf</code>:</p>
<div class="highlight"><pre><span></span><code>signed-binary-caches = *
binary-cache-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
</code></pre></div>
<p>This will prevent Nix from downloading any binary from the cache
that is not signed by one of the keys listed in
<code>binary-cache-public-keys</code>.</p>
<p>Signature checking is only supported if you built Nix with the
<code>libsodium</code> package.</p>
<p>Note that while Nix has had experimental support for signed binary
caches since version 1.7, this release changes the signature format
in a backwards-incompatible way.</p>
</li>
<li>
<p>Automatic downloading of Nix expression tarballs. In various places,
you can now specify the URL of a tarball containing Nix expressions
(such as Nixpkgs), which will be downloaded and unpacked
automatically. For example:</p>
<ul>
<li>
<p>In <code>nix-env</code>:</p>
<div class="highlight"><pre><span></span><code>$ nix-env -f https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz -iA firefox
</code></pre></div>
<p>This installs Firefox from the latest tested and built revision
of the NixOS 14.12 channel.</p>
</li>
<li>
<p>In <code>nix-build</code> and <code>nix-shell</code>:</p>
<div class="highlight"><pre><span></span><code>$ nix-build https://github.com/NixOS/nixpkgs/archive/master.tar.gz -A hello
</code></pre></div>
<p>This builds GNU Hello from the latest revision of the Nixpkgs
master branch.</p>
</li>
<li>
<p>In the Nix search path (as specified via <code>NIX_PATH</code> or <code>-I</code>).
For example, to start a shell containing the Pan package from a
specific version of Nixpkgs:</p>
<div class="highlight"><pre><span></span><code>$ nix-shell -p pan -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/8a3eea054838b55aca962c3fbde9c83c102b8bf2.tar.gz
</code></pre></div>
</li>
<li>
<p>In <code>nixos-rebuild</code> (on NixOS):</p>
<div class="highlight"><pre><span></span><code>$ nixos-rebuild test -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-unstable.tar.gz
</code></pre></div>
</li>
<li>
<p>In Nix expressions, via the new builtin function <code>fetchTarball</code>:</p>
<div class="highlight"><pre><span></span><code>with import (fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz) {}; …
</code></pre></div>
<p>(This is not allowed in restricted mode.)</p>
</li>
</ul>
</li>
<li>
<p><code>nix-shell</code> improvements:</p>
<ul>
<li>
<p><code>nix-shell</code> now has a flag <code>--run</code> to execute a command in the
<code>nix-shell</code> environment, e.g. <code>nix-shell --run make</code>. This is
like the existing <code>--command</code> flag, except that it uses a
non-interactive shell (ensuring that hitting Ctrl-C won’t drop
you into the child shell).</p>
</li>
<li>
<p><code>nix-shell</code> can now be used as a <code>#!</code>-interpreter. This allows
you to write scripts that dynamically fetch their own
dependencies. For example, here is a Haskell script that, when
invoked, first downloads GHC and the Haskell packages on which
it depends:</p>
<div class="highlight"><pre><span></span><code>#! /usr/bin/env nix-shell
#! nix-shell -i runghc -p haskellPackages.ghc haskellPackages.HTTP
import Network.HTTP
main = do
resp &lt;- Network.HTTP.simpleHTTP (getRequest &quot;http://nixos.org/&quot;)
body &lt;- getResponseBody resp
print (take 100 body)
</code></pre></div>
<p>Of course, the dependencies are cached in the Nix store, so the
second invocation of this script will be much faster.</p>
</li>
</ul>
</li>
<li>
<p>Chroot improvements:</p>
<ul>
<li>
<p>Chroot builds are now supported on Mac OS X (using its sandbox
mechanism).</p>
</li>
<li>
<p>If chroots are enabled, they are now used for all derivations,
including fixed-output derivations (such as <code>fetchurl</code>). The
latter do have network access, but can no longer access the host
filesystem. If you need the old behaviour, you can set the
option <code>build-use-chroot</code> to <code>relaxed</code>.</p>
</li>
<li>
<p>On Linux, if chroots are enabled, builds are performed in a
private PID namespace once again. (This functionality was lost
in Nix 1.8.)</p>
</li>
<li>
<p>Store paths listed in <code>build-chroot-dirs</code> are now automatically
expanded to their closure. For instance, if you want
<code>/nix/store/…-bash/bin/sh</code> mounted in your chroot as <code>/bin/sh</code>,
you only need to say <code>build-chroot-dirs =
/bin/sh=/nix/store/…-bash/bin/sh</code>; it is no longer necessary to
specify the dependencies of Bash.</p>
</li>
</ul>
</li>
<li>
<p>The new derivation attribute <code>passAsFile</code> allows you to specify that
the contents of derivation attributes should be passed via files
rather than environment variables. This is useful if you need to
pass very long strings that exceed the size limit of the
environment. The Nixpkgs function <code>writeTextFile</code> uses this.</p>
</li>
<li>
<p>You can now use <code>~</code> in Nix file names to refer to your home
directory, e.g. <code>import
~/.nixpkgs/config.nix</code>.</p>
</li>
<li>
<p>Nix has a new option <code>restrict-eval</code> that allows limiting what paths
the Nix evaluator has access to. By passing <code>--option restrict-eval
true</code> to Nix, the evaluator will throw an exception if an attempt is
made to access any file outside of the Nix search path. This is
primarily intended for Hydra to ensure that a Hydra jobset only
refers to its declared inputs (and is therefore reproducible).</p>
</li>
<li>
<p><code>nix-env</code> now only creates a new “generation” symlink in
<code>/nix/var/nix/profiles</code> if something actually changed.</p>
</li>
<li>
<p>The environment variable <code>NIX_PAGER</code> can now be set to override
<code>PAGER</code>. You can set it to <code>cat</code> to disable paging for Nix commands
only.</p>
</li>
<li>
<p>Failing <code>&lt;...&gt;</code> lookups now show position information.</p>
</li>
<li>
<p>Improved Boehm GC use: we disabled scanning for interior pointers,
which should reduce the “<code>Repeated
allocation of very large block</code>” warnings and associated retention
of memory.</p>
</li>
</ul>
<p>This release has contributions from aszlig, Benjamin Staffin, Charles
Strahan, Christian Theune, Daniel Hahler, Danylo Hlynskyi Daniel
Peebles, Dan Peebles, Domen Kožar, Eelco Dolstra, Harald van Dijk, Hoang
Xuan Phu, Jaka Hudoklin, Jeff Ramnani, j-keck, Linquize, Luca Bruno,
Michael Merickel, Oliver Dunkl, Rob Vermaas, Rok Garbas, Shea Levy,
Tobias Geerinckx-Rice and William A. Kennington III.</p>
</article>
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