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<h1 id="release-08-2005-04-11">Release 0.8 (2005-04-11)</h1>
<p>NOTE: the hashing scheme in Nix 0.8 changed (as detailed below). As a
result, <code>nix-pull</code> manifests and channels built for Nix 0.7 and below
will not work anymore. However, the Nix expression language has not
changed, so you can still build from source. Also, existing user
environments continue to work. Nix 0.8 will automatically upgrade the
database schema of previous installations when it is first run.</p>
<p>If you get the error message</p>
<div class="highlight"><pre><span></span><code>you have an old-style manifest `/nix/var/nix/manifests/[...]&#39;; please
delete it
</code></pre></div>
<p>you should delete previously downloaded manifests:</p>
<div class="highlight"><pre><span></span><code>$ rm /nix/var/nix/manifests/*
</code></pre></div>
<p>If <code>nix-channel</code> gives the error message</p>
<div class="highlight"><pre><span></span><code>manifest `http://catamaran.labs.cs.uu.nl/dist/nix/channels/[channel]/MANIFEST&#39;
is too old (i.e., for Nix &lt;= 0.7)
</code></pre></div>
<p>then you should unsubscribe from the offending channel (<code>nix-channel
--remove
URL</code>; leave out <code>/MANIFEST</code>), and subscribe to the same URL, with
<code>channels</code> replaced by <code>channels-v3</code> (e.g.,
<a href="http://catamaran.labs.cs.uu.nl/dist/nix/channels-v3/nixpkgs-unstable">http://catamaran.labs.cs.uu.nl/dist/nix/channels-v3/nixpkgs-unstable</a>).</p>
<p>Nix 0.8 has the following improvements:</p>
<ul>
<li>
<p>The cryptographic hashes used in store paths are now 160 bits long,
but encoded in base-32 so that they are still only 32 characters
long (e.g.,
<code>/nix/store/csw87wag8bqlqk7ipllbwypb14xainap-atk-1.9.0</code>). (This is
actually a 160 bit truncation of a SHA-256 hash.)</p>
</li>
<li>
<p>Big cleanups and simplifications of the basic store semantics. The
notion of “closure store expressions” is gone (and so is the notion
of “successors”); the file system references of a store path are now
just stored in the database.</p>
<p>For instance, given any store path, you can query its closure:</p>
<div class="highlight"><pre><span></span><code>$ nix-store -qR $(which firefox)
... lots of paths ...
</code></pre></div>
<p>Also, Nix now remembers for each store path the derivation that
built it (the “deriver”):</p>
<div class="highlight"><pre><span></span><code>$ nix-store -qR $(which firefox)
/nix/store/4b0jx7vq80l9aqcnkszxhymsf1ffa5jd-firefox-1.0.1.drv
</code></pre></div>
<p>So to see the build-time dependencies, you can do</p>
<div class="highlight"><pre><span></span><code>$ nix-store -qR $(nix-store -qd $(which firefox))
</code></pre></div>
<p>or, in a nicer format:</p>
<div class="highlight"><pre><span></span><code>$ nix-store -q --tree $(nix-store -qd $(which firefox))
</code></pre></div>
<p>File system references are also stored in reverse. For instance, you
can query all paths that directly or indirectly use a certain Glibc:</p>
<div class="highlight"><pre><span></span><code>$ nix-store -q --referrers-closure
/nix/store/8lz9yc6zgmc0vlqmn2ipcpkjlmbi51vv-glibc-2.3.4
</code></pre></div>
</li>
<li>
<p>The concept of fixed-output derivations has been formalised.
Previously, functions such as <code>fetchurl</code> in Nixpkgs used a hack
(namely, explicitly specifying a store path hash) to prevent changes
to, say, the URL of the file from propagating upwards through the
dependency graph, causing rebuilds of everything. This can now be
done cleanly by specifying the <code>outputHash</code> and <code>outputHashAlgo</code>
attributes. Nix itself checks that the content of the output has the
specified hash. (This is important for maintaining certain
invariants necessary for future work on secure shared stores.)</p>
</li>
<li>
<p>One-click installation :-) It is now possible to install any
top-level component in Nixpkgs directly, through the web — see,
e.g., <a href="http://catamaran.labs.cs.uu.nl/dist/nixpkgs-0.8/">http://catamaran.labs.cs.uu.nl/dist/nixpkgs-0.8/</a>. All you
have to do is associate <code>/nix/bin/nix-install-package</code> with the MIME
type <code>application/nix-package</code> (or the extension <code>.nixpkg</code>), and
clicking on a package link will cause it to be installed, with all
appropriate dependencies. If you just want to install some specific
application, this is easier than subscribing to a channel.</p>
</li>
<li>
<p><code>nix-store -r
PATHS</code> now builds all the derivations PATHS in parallel. Previously
it did them sequentially (though exploiting possible parallelism
between subderivations). This is nice for build farms.</p>
</li>
<li>
<p><code>nix-channel</code> has new operations <code>--list</code> and <code>--remove</code>.</p>
</li>
<li>
<p>New ways of installing components into user environments:</p>
<ul>
<li>
<p>Copy from another user environment:</p>
<div class="highlight"><pre><span></span><code>$ nix-env -i --from-profile .../other-profile firefox
</code></pre></div>
</li>
<li>
<p>Install a store derivation directly (bypassing the Nix
expression language entirely):</p>
<div class="highlight"><pre><span></span><code>$ nix-env -i /nix/store/z58v41v21xd3...-aterm-2.3.1.drv
</code></pre></div>
<p>(This is used to implement <code>nix-install-package</code>, which is
therefore immune to evolution in the Nix expression language.)</p>
</li>
<li>
<p>Install an already built store path directly:</p>
<div class="highlight"><pre><span></span><code>$ nix-env -i /nix/store/hsyj5pbn0d9i...-aterm-2.3.1
</code></pre></div>
</li>
<li>
<p>Install the result of a Nix expression specified as a
command-line argument:</p>
<div class="highlight"><pre><span></span><code>$ nix-env -f .../i686-linux.nix -i -E &#39;x: x.firefoxWrapper&#39;
</code></pre></div>
<p>The difference with the normal installation mode is that <code>-E</code>
does not use the <code>name</code> attributes of derivations. Therefore,
this can be used to disambiguate multiple derivations with the
same name.</p>
</li>
</ul>
</li>
<li>
<p>A hash of the contents of a store path is now stored in the database
after a successful build. This allows you to check whether store
paths have been tampered with: <code>nix-store
--verify --check-contents</code>.</p>
</li>
<li>
<p>Implemented a concurrent garbage collector. It is now always safe to
run the garbage collector, even if other Nix operations are
happening simultaneously.</p>
<p>However, there can still be GC races if you use <code>nix-instantiate</code>
and <code>nix-store
--realise</code> directly to build things. To prevent races, use the
<code>--add-root</code> flag of those commands.</p>
</li>
<li>
<p>The garbage collector now finally deletes paths in the right order
(i.e., topologically sorted under the “references” relation), thus
making it safe to interrupt the collector without risking a store
that violates the closure invariant.</p>
</li>
<li>
<p>Likewise, the substitute mechanism now downloads files in the right
order, thus preserving the closure invariant at all times.</p>
</li>
<li>
<p>The result of <code>nix-build</code> is now registered as a root of the garbage
collector. If the <code>./result</code> link is deleted, the GC root disappears
automatically.</p>
</li>
<li>
<p>The behaviour of the garbage collector can be changed globally by
setting options in <code>/nix/etc/nix/nix.conf</code>.</p>
<ul>
<li>
<p><code>gc-keep-derivations</code> specifies whether deriver links should be
followed when searching for live paths.</p>
</li>
<li>
<p><code>gc-keep-outputs</code> specifies whether outputs of derivations
should be followed when searching for live paths.</p>
</li>
<li>
<p><code>env-keep-derivations</code> specifies whether user environments
should store the paths of derivations when they are added (thus
keeping the derivations alive).</p>
</li>
</ul>
</li>
<li>
<p>New <code>nix-env</code> query flags <code>--drv-path</code> and <code>--out-path</code>.</p>
</li>
<li>
<p><code>fetchurl</code> allows SHA-1 and SHA-256 in addition to MD5. Just specify
the attribute <code>sha1</code> or <code>sha256</code> instead of <code>md5</code>.</p>
</li>
<li>
<p>Manual updates.</p>
</li>
</ul>
</article>
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