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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html
PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<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 is a stable version (version 4) and a development version
of Carpet available, plus several outdated versions. Versions 1,
2, and 3 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considered outdated.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 4 is the current stable version. There are no plans to
develop this version further, but errors will be corrected. 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, i.e. following the relvant
mailing lists.</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 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 install 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Version 1 (outdated)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 (outdated)</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>Version 4 (current stable version)</h3>
<p>Version 4 of Carpet is available
via <a href="http://git.or.cz/">git</a>:</p>
<pre> cd Cactus
git clone -o carpet git://www.carpetcode.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>
<h3>Development Version</h3>
<p>The development version of Carpet is available
via <a href="http://mercurial.selenic.com/">Mercurial</a>:</p>
<pre> cd Cactus
hg clone http://www.carpetcode.org/hg/carpet
cd arrangements
ln -s ../carpetcode/Carpet* .</pre>
<p>(Don't miss the dot after the <code>Carpet*</code> in the last
line.) Instructions for using Mercurial are
given <a href="#hg">below</a>.</p>
<h2>Write Access</h2>
<!-- darcs is outdated
<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 für
Astronomie und Astrophysik</a> of the Universität Tübingen for
hosting the CVS and darcs servers.</p>
-->
<h3>Git Repository</h3>
<p>Write access to Carpet git repositories is handled via
ssh. Once you have an account set up, you obtain Carpet via</p>
<pre> cd Cactus
git clone carpetgit@carpetcode.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>
<h3>Mercurial Repository</h3>
<p>Write access to Carpet Mercurial repositories is handled via
ssh. Once you have an account set up, you obtain Carpet via</p>
<pre> cd Cactus
hg clone ssh://carpetmercurial@www.carpetcode.org/carpet
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="#hgt">below</a>.</p>
<p>The Carpet Mercurial server is also 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://git.or.cz/">git</a>
and <a href="http://mercurial.selenic.com/">Mercurial</a>
repositories instead of CVS or SVN repositories. Git and Mercurial
have a number of advantages over CVS and SVN 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 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 on
the <a href="http://git.or.cz/">git web pages</a> and
the <a href="http://mercurial.selenic.com/">Mercurial 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 id="hg">Using Mercurial</h3>
<p>The <a href="http://mercurial.selenic.com/">Mercurial web
site</a> contains introductions and documentation for Mercurial.
Mercurial should be available for all modern operating systems. It
is also not difficult to install manually.</p>
<p>On Mac operating systems, Mercurial comes with a convenient
graphical user interface called <code>MacHG</code>. This allows
you to update your code from the master, commit local changes,
compare branches, or push local changes back to the master
repository.</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 use the
command</p>
<pre>cd Cactus/carpet
hg pull -u</pre>
<p>which will download and merge the current version. Mercurial
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 -->
<!-- hhmts start -->
Last modified: Tue Feb 15 2011
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