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<h1 id="release-012-2008-11-20">Release 0.12 (2008-11-20)</h1>
<ul>
<li>
<p>Nix no longer uses Berkeley DB to store Nix store metadata. The
principal advantages of the new storage scheme are: it works
properly over decent implementations of NFS (allowing Nix stores to
be shared between multiple machines); no recovery is needed when a
Nix process crashes; no write access is needed for read-only
operations; no more running out of Berkeley DB locks on certain
operations.</p>
<p>You still need to compile Nix with Berkeley DB support if you want
Nix to automatically convert your old Nix store to the new schema.
If you don’t need this, you can build Nix with the <code>configure</code>
option <code>--disable-old-db-compat</code>.</p>
<p>After the automatic conversion to the new schema, you can delete the
old Berkeley DB files:</p>
<div class="highlight"><pre><span></span><code>$ cd /nix/var/nix/db
$ rm __db* log.* derivers references referrers reserved validpaths DB_CONFIG
</code></pre></div>
<p>The new metadata is stored in the directories <code>/nix/var/nix/db/info</code>
and <code>/nix/var/nix/db/referrer</code>. Though the metadata is stored in
human-readable plain-text files, they are not intended to be
human-editable, as Nix is rather strict about the format.</p>
<p>The new storage schema may or may not require less disk space than
the Berkeley DB environment, mostly depending on the cluster size of
your file system. With 1 KiB clusters (which seems to be the <code>ext3</code>
default nowadays) it usually takes up much less space.</p>
</li>
<li>
<p>There is a new substituter that copies paths directly from other
(remote) Nix stores mounted somewhere in the filesystem. For
instance, you can speed up an installation by mounting some remote
Nix store that already has the packages in question via NFS or
<code>sshfs</code>. The environment variable <code>NIX_OTHER_STORES</code> specifies the
locations of the remote Nix directories, e.g. <code>/mnt/remote-fs/nix</code>.</p>
</li>
<li>
<p>New <code>nix-store</code> operations <code>--dump-db</code> and <code>--load-db</code> to dump and
reload the Nix database.</p>
</li>
<li>
<p>The garbage collector has a number of new options to allow only some
of the garbage to be deleted. The option <code>--max-freed N</code> tells the
collector to stop after at least <em>N</em> bytes have been deleted. The
option <code>--max-links
N</code> tells it to stop after the link count on <code>/nix/store</code> has dropped
below <em>N</em>. This is useful for very large Nix stores on filesystems
with a 32000 subdirectories limit (like <code>ext3</code>). The option
<code>--use-atime</code> causes store paths to be deleted in order of ascending
last access time. This allows non-recently used stuff to be deleted.
The option <code>--max-atime time</code> specifies an upper limit to the last
accessed time of paths that may be deleted. For instance,</p>
<div class="highlight"><pre><span></span><code> $ nix-store --gc -v --max-atime $(date +%s -d &quot;2 months ago&quot;)
</code></pre></div>
<p>deletes everything that hasn’t been accessed in two months.</p>
</li>
<li>
<p><code>nix-env</code> now uses optimistic profile locking when performing an
operation like installing or upgrading, instead of setting an
exclusive lock on the profile. This allows multiple <code>nix-env -i / -u
/ -e</code> operations on the same profile in parallel. If a <code>nix-env</code>
operation sees at the end that the profile was changed in the
meantime by another process, it will just restart. This is generally
cheap because the build results are still in the Nix store.</p>
</li>
<li>
<p>The option <code>--dry-run</code> is now supported by <code>nix-store -r</code> and
<code>nix-build</code>.</p>
</li>
<li>
<p>The information previously shown by <code>--dry-run</code> (i.e., which
derivations will be built and which paths will be substituted) is
now always shown by <code>nix-env</code>, <code>nix-store -r</code> and <code>nix-build</code>. The
total download size of substitutable paths is now also shown. For
instance, a build will show something like</p>
<div class="highlight"><pre><span></span><code>the following derivations will be built:
/nix/store/129sbxnk5n466zg6r1qmq1xjv9zymyy7-activate-configuration.sh.drv
/nix/store/7mzy971rdm8l566ch8hgxaf89x7lr7ik-upstart-jobs.drv
...
the following paths will be downloaded/copied (30.02 MiB):
/nix/store/4m8pvgy2dcjgppf5b4cj5l6wyshjhalj-samba-3.2.4
/nix/store/7h1kwcj29ip8vk26rhmx6bfjraxp0g4l-libunwind-0.98.6
...
</code></pre></div>
</li>
<li>
<p>Language features:</p>
<ul>
<li>
<p>@-patterns as in Haskell. For instance, in a function definition</p>
<div class="highlight"><pre><span></span><code>f = args @ {x, y, z}: ...;
</code></pre></div>
<p><code>args</code> refers to the argument as a whole, which is further
pattern-matched against the attribute set pattern <code>{x, y, z}</code>.</p>
</li>
<li>
<p>“<code>...</code>” (ellipsis) patterns. An attribute set pattern can now
say <code>...</code> at the end of the attribute name list to specify that
the function takes <em>at least</em> the listed attributes, while
ignoring additional attributes. For instance,</p>
<div class="highlight"><pre><span></span><code>{stdenv, fetchurl, fuse, ...}: ...
</code></pre></div>
<p>defines a function that accepts any attribute set that includes
at least the three listed attributes.</p>
</li>
<li>
<p>New primops: <code>builtins.parseDrvName</code> (split a package name
string like <code>"nix-0.12pre12876"</code> into its name and version
components, e.g. <code>"nix"</code> and <code>"0.12pre12876"</code>),
<code>builtins.compareVersions</code> (compare two version strings using
the same algorithm that <code>nix-env</code> uses), <code>builtins.length</code>
(efficiently compute the length of a list), <code>builtins.mul</code>
(integer multiplication), <code>builtins.div</code> (integer division).</p>
</li>
</ul>
</li>
<li>
<p><code>nix-prefetch-url</code> now supports <code>mirror://</code> URLs, provided that the
environment variable <code>NIXPKGS_ALL</code> points at a Nixpkgs tree.</p>
</li>
<li>
<p>Removed the commands <code>nix-pack-closure</code> and <code>nix-unpack-closure</code>.
You can do almost the same thing but much more efficiently by doing
<code>nix-store --export
$(nix-store -qR paths) &gt; closure</code> and <code>nix-store --import &lt;
closure</code>.</p>
</li>
<li>
<p>Lots of bug fixes, including a big performance bug in the handling
of <code>with</code>-expressions.</p>
</li>
</ul>
</article>
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