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<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-15" />
<title>Download Carpet</title>
<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
</script>
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<h1>Download Carpet</h1>
<h2>Available Versions</h2>
<p>Carpet is distributed under the <a
href="http://www.gnu.org/licenses/licenses.html">GNU General
Public License (GPL)</a>. It might be released under the GNU
Lesser General Public License (LGPL) in the future, to match the
distribution terms of Cactus.</p>
<p>There are currently three different versions of Carpet
available:</p>
<ul>
<li>Version 1, the old stable version (via CVS)</li>
<li>Version 2, the upcoming second stable version (via darcs;
CVS mirror planned)</li>
<li>Development version (via darcs)</li>
</ul>
<p>Version 1 has been unchanged for quite some time. There are no
plans to make any further changes to this version unless a
catastrophic error is detected.</p>
<p>Version 2 is the upcoming next stable version. This version is
almost feature complete, but we continue to improve its
performance for parallel communication and I/O. This version will
probably be released in a few week. After its release, we will
only correct errors, so that its users have a stable platform to
rely on. We recommend this version for the casual user and for
production runs.</p>
<p>The development version will always see changes, some of which
might surprise you. You should not use it without keeping close
contact to the developers.</p>
<h2>Getting Carpet</h2>
<p>Carpet is a driver for Cactus. It works as a part of Cactus,
and you will need to have the developers' version of Cactus
installed before you can use Carpet. Please look at the <a
href="http://www.cactuscode.org/">Cactus web pages</a> for an
introduction to Cactus and for installation instructions.</p>
<p>Carpet consists of several arrangements, each living in a
directory. The arrangement <code>Carpet</code> contains the basic
driver part that everybody needs. The arrangement
<code>CarpetExtra</code> contains useful add-ons and some example
code. Development of new thorns happens in the
<code>CarpetDev</code> arrangement, which means that the code in
there is not to be trusted. And finally, there is a graveyard
arrangement <code>CarpetAttic</code> of things that only used to
be useful and are now in a state of decay.</p>
<h3>Version 1</h3>
<p>Version 1 of Carpet is available via anonymous <a
href="http://www.cvshome.org/">CVS</a>:</p>
<pre> cd Cactus/arrangements
cvs -d :pserver:cvs_anon@cvs.carpetcode.org:/home/cvs/carpet login
cvs -d :pserver:cvs_anon@cvs.carpetcode.org:/home/cvs/carpet checkout Carpet
cvs -d :pserver:cvs_anon@cvs.carpetcode.org:/home/cvs/carpet checkout CarpetExtra
cvs -d :pserver:cvs_anon@cvs.carpetcode.org:/home/cvs/carpet checkout CarpetDev</pre>
<p>The password for anonymous CVS access is <code>anon</code>.
Instructions for dealing with CVS are available everywhere on the
web, e.g. also on the <a href="http://www.cactuscode.org/">Cactus
pages</a>.</p>
<h3>Version 2</h3>
<p>Version 2 of Carpet is available via anonymous <a
href="http://www.darcs.net/">darcs</a> (a CVS mirror is planned):</p>
<pre> cd Cactus
darcs get http://www.carpetcode.org/~darcs/carpet-stable-2
cd arrangements
ln -s ../carpet-stable-2/Carpet* .</pre>
<p>(Don't miss the dot after the <code>Carpet*</code> in the last
line.) Instructions for using darcs are given <a
href="#darcs">below</a>. You can also have a look at <a
href="http://www.carpetcode.org/~darcs/carpet-stable-2">Carpet's
source tree</a> in your web browser.</p>
<h3>Development Version</h3>
<p>The development version of Carpet is not available anonymously.
<a href="mailto:schnetter@aei.mpg.de">Ask me</a> if you would like
an account. Once you have an account, you get the development
version via</p>
<pre> cd Cactus
darcs get darcs@cvs.carpetcode.org:/home/darcs/carpet
cd arrangements
ln -s ../carpet-stable-2/Carpet* .</pre>
<p>(Don't miss the dot after the <code>Carpet*</code> in the last
line.) Instructions for using darcs are given <a
href="#darcs">below</a>.</p>
<p>We thank the <a
href="http://www.tat.physik.uni-tuebingen.de/">Institut f�r
Astronomie und Astrophysik</a> of the Universit�t T�bingen for
hosting the CVS and darcs server.</p>
<hr />
<h2 id="darcs">Using Darcs</h2>
<p>Carpet is managed in a <a href="http://darcs.net/">darcs</a>
repository instead of a CVS repository. Darcs has a number of
advantages over CVS for us developers, such as:</p>
<ul>
<li>You have a local copy of the repository, and can therefore
work offline</li>
<li>You can decide which changes you want to import and export,
so that you can omit dangerous changes, or keep changes to
yourself until you are ready to publish them</li>
<li>You can undo most changes</li>
<li>You can easily rename files and directories</li>
<li>Darcs does not need its own server, which makes it both more
convenient and more secure</li>
</ul>
<p>and then some more, as described in the <a
href="http://darcs.net/manual/">darcs manual</a>.</p>
<p>If darcs is not already installed on your system, you need to
do so. This is described on the <a href="http://darcs.net/">darcs
home page</a>, and some links to binaries are given in the darcs
wiki. If you have problems installing or using darcs in general,
then you should ask on the darcs mailing list, which I (Erik
Schnetter) read regularly.</p>
<h3>Convenient SSH key management</h3>
<p>Ssh has two mechanisms for authentication, typing a password,
or using ssh keys. When you use ssh keys, your private key is
(<em>should</em>) usually be protected by a password. That means
that you have to type this password every time you log into a
different machine. Some people protect their private ssh key with
an empty password --- this way, they don't have to type a
password, but this is not very secure. If somebody is able to
copy the private ssh key, they have access to your remote
accounts. In this way, intruders can hop from one machine to the
next. This is not just a theoretical risk.</p>
<p>Ssh-agent is a convenient way to make things safe yet
convenient. It is an agent that starts automatically when you log
in, and asks you for your ssh key password. It remembers this
password in memory, and whenever you use ssh to log into a remote
account, ssh contacts the ssh-agent for the password to the key.
If that password works, you don't have to type anything.</p>
<p>I use the following lines in my <code>.bash_profile</code> to
make this happen:</p>
<pre>keychain id_dsa
test -f $HOME/.keychain/$(hostname)-sh && source $HOME/.keychain/$(hostname)-sh > /dev/null
</pre>
<p>Keychain starts the ssh-agent. Keychain can also handle gpg
key passwords for your encrypted and/or signed emails.</p>
<h3>Updating the Repository from the Master</h3>
<p>At some time you will want to update your version of Carpet and
incorporate some changes from the main Carpet repository. You do
this with the command</p>
<pre>cd Cactus/carpet-stable-2
darcs pull</pre>
<p>which will look for new changes, and then ask you which of these
you want to obtain. Normally, you will want all changes.</p>
<h3>Working with Darcs</h3>
<p>We also have some instructions on how to <a
href="work-with-darcs.html">develop Carpet with darcs</a>.</p>
<hr />
<p>Go back to the <a href=".">Carpet home page</a>.</p>
<hr />
<p>
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<hr />
<address><a href="mailto:schnetter@uni-tuebingen.de">Erik Schnetter</a></address>
<!-- Created: Tue Sep 28 16:52:20 CEST 2004 -->
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