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<?xml version="1.0" encoding="ISO-8859-15"?>
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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-15" />
<title>Obtaining Carpet</title>
</head>
<body>
<h1>Obtaining 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 stable versions of Carpet available,
plus the current development version. Versions 1 and 2 have been
unchanged for quite some time, and should be considered outdated.
There are no plans to make any further changes to these
versions.</p>
<p>Version 3 is the current stable version. There are no plans to
make further changes to this version unless a serious error is
detected. We recommend this version for the casual users 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 in
close contact with the developers.</p>
<h2>Downloading the Code</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 experimental 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Version 1 (outdated)</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 (outdated)</h3>
<p>Version 2 of Carpet is available via anonymous <a
href="http://www.darcs.net/">darcs</a>:</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
the <a
href="http://www.carpetcode.org/~darcs/carpet-stable-2/">version 2
source tree</a> in your web browser.</p>
<h3>Version 3 (current stable version)</h3>
<p>Version 3 of Carpet is available via anonymous <a
href="http://www.darcs.net/">darcs</a>:</p>
<pre> cd Cactus
darcs get http://www.carpetcode.org/~darcs/carpet-stable-3/
cd arrangements
ln -s ../carpet-stable-3/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
the <a
href="http://www.carpetcode.org/~darcs/carpet-stable-3/">version 3
source tree</a> in your web browser.</p>
<p>You can also obtain the darcs repository using <tt>wget</tt>
instead of <tt>darcs</tt>. For this, use the command</p>
<pre> wget -r -nH -np --cut-dirs=1 -R "index.html*" http://www.carpetcode.org/\~darcs/carpet-stable-3/</pre>
<p>This copies the darcs repository into a subdirectory
called <tt>carpet-stable-3</tt>, in much the same way as
the <tt>darcs get</tt> command above would. That is, you also end
up with a fully functional local repository.</p>
<h3>Development Version</h3>
<p>The development version of Carpet is available via
<a href="http://git.or.cz/">git</a>:</p>
<pre> cd Cactus
git clone -o carpet git://carpetcode.dyndns.org/carpet.git
cd arrangements
ln -s ../carpet/Carpet* .</pre>
<p>(Don't miss the dot after the <code>Carpet*</code> in the last
line.) Instructions for using git are
given <a href="#git">below</a>.</p>
<!-- This doesn't work yet
You can also have a look at
the <a href="http://carpetcode.dyndns.org/~carpet/git/">development
source tree</a> in your web browser.</p>
-->
<!-- Should we also allow download via wget? -->
<h2>Write Access</h2>
<h3>Darcs Repositories</h3>
<p>Write access to Carpet darcs repositories is handled via ssh.
Once you have an account set up, you obtain e.g. the third stable
version with</p>
<pre> cd Cactus
darcs get darcs@cvs.carpetcode.org:/home/darcs/carpet-stable-3
cd arrangements
ln -s ../carpet-stable-3/Carpet* .</pre>
<p>(Don't miss the dot after the <code>Carpet*</code> in the last
line.) Further instructions for using darcs are
given <a href="#darcs">below</a>.</p>
<p>You can also obtain the darcs repository using <tt>rsync</tt>
instead of <tt>darcs</tt>. For this, use the command</p>
<pre> rsync -Paz darcs@cvs.carpetcode.org:carpet-stable-3 .</pre>
<p>This copies the darcs repository into a subdirectory
called <tt>carpet-stable-3</tt>, in much the same way as
the <tt>darcs get</tt> command above would. That is, you also end
up with a fully functional local repository.</p>
<p>We thank
the <a href="http://www.tat.physik.cct.lsu.edu/">Institut f�r
Astronomie und Astrophysik</a> of the Universit�t T�bingen for
hosting the CVS and darcs servers.</p>
<h3>Git Repository</h3>
<p>Write access to Carpet git repositories is also handled via
ssh. Once you have an account set up, you obtain e.g. the
development version with</p>
<pre> cd Cactus
git clone carpetgit@carpetcode.dyndns.org:carpet.git
cd arrangements
ln -s ../carpet/Carpet* .</pre>
<p>(Don't miss the dot after the <code>Carpet*</code> in the last
line.) Further instructions for using git are
given <a href="#git">below</a>.</p>
<!-- rsync access is not yet set up
<p>You can also obtain the darcs repository using <tt>rsync</tt>
instead of <tt>darcs</tt>. For this, use the command</p>
<pre> rsync -Paz darcs@cvs.carpetcode.org:carpet-stable-3 .</pre>
<p>This copies the darcs repository into a subdirectory
called <tt>carpet-stable-3</tt>, in much the same way as
the <tt>darcs get</tt> command above would. That is, you also end
up with a fully functional local repository.</p>
-->
<p>The Carpet git server is a courtesy
of <a href="http://www.tapir.caltech.edu/~cott/">Christian
D. Ott</a>.</p>
<hr />
<h2>Modern Version Control Systems</h2>
<p>Carpet is managed in <a href="http://darcs.net/">darcs</a> and
<a href="http://git.or.cz/">git</a> repositories instead of a CVS
repository. Darcs and git have a number of advantages over CVS
for 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 all changes</li>
<li>You can easily rename files and directories</li>
<li>You can work in a decentralised manner, which suits large
collaborations which may want to avoid a central point of
control</li>
</ul>
<p>and then some more, as described in
the <a href="http://darcs.net/manual/">darcs manual</a> and
the <a href="http://git.or.cz/">git web pages</a>.</p>
<h3 id="darcs">Using Darcs</h3>
<p>The foremost source of information about darcs is
the <a href="http://darcs.net/DarcsWiki">darcs wiki</a>,
especially
its <a href="http://darcs.net/DarcsWiki/GettingStarted">Getting
Started</a> pages, and the
<a
href="http://darcs.net/DarcsWiki/FrequentlyAskedQuestions">Frequently
Asked Questions</a>.</p>
<p>If darcs is not already installed on your system, you need to
do so yourself. 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.</p>
<h3>Updating the Repository from the Master Repository</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-3
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 have some instructions on how
to <a href="work-with-darcs.html">develop Carpet with
darcs</a>.</p>
<h3 id="git">Using Git</h3>
<p>The <a href="http://git.or.cz/">git web site</a> contains
introductions and documentation for git. The Linux kernel
developers also maintain
a <a href="http://www.kernel.org/pub/software/scm/git/docs/gittutorial.html">tutorial</a> for
git. Git should be available for all modern operating systems.
It is also not difficult to install manually.</p>
<p>Git comes with a convenient graphical user interface
called <code>git-gui</code>. It allows you to update your code
from the master, commit local changes, compare branches, or push
local changes back to the master repository.</p>
<p>We have also some <a href="work-with-git.html">hints for using
git</a>.</p>
<h3>Updating the Repository from the Master Repository</h3>
<p>At some time you will want to update your version of Carpet and
incorporate some changes from the main Carpet repository. If you
are not using the graphical user interface, then you do this with
the command</p>
<pre>cd Cactus/carpet
git pull</pre>
<p>which will download and merge the current version. Git will
refuse to overwrite any conflicting local changes that you may
have.</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>) 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 --- in 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. Intruders can
use this hop from one machine to the next. Please do not use
empty passwords on your ssh keys.</p>
<p>SSH-agent is a convenient way to make things safe. It is an
agent that starts automatically when you log in, and asks you for
your ssh key password once. 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 this
password is accepted, 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>
<hr />
<p>Go back to the <a href=".">Carpet home page</a>.</p>
<hr />
<p>
<a href="http://validator.w3.org/check?uri=referer"><img
src="http://www.w3.org/Icons/valid-xhtml10"
alt="Valid XHTML 1.0!" height="31" width="88" /></a>
</p>
<hr />
<address><a href="mailto:schnetter@cct.lsu.edu">Erik Schnetter</a></address>
<!-- Created: Tue Sep 28 16:52:20 CEST 2004 -->
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Last modified: Sat Mar 01 2008
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