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<h3>Obtaining the MITgcm Source using CVS</h3> |
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<h4>Using CVS "pserver" for Anonymous Access</h4> |
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<p>The most convenient way to get local copies of the MITgcm source code is |
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to use the CVS "pserver" mechanism. This method only allows you to "check |
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out" (or obtain a local copy) of the source. It does not provide a |
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mechanism for "committing" or "checking in" changes (please see below). |
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Using CVS pserver from the command line requires just a three commands. |
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Using a Bourne, "bash", or "sh-compatible" shell they are:</p> |
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|
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<pre> |
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$ export CVSROOT=':pserver:cvsanon@mitgcm.org:/u/gcmpack' |
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$ cvs login |
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( enter the CVS password: "cvsanon" ) |
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$ cvs co MITgcm MITgcm_contrib |
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</pre> |
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<p>Using a "C", "csh", or "tcsh" shell the commands are:</p> |
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|
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<pre> |
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$ setenv CVSROOT ':pserver:cvsanon@mitgcm.org:/u/gcmpack' |
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$ cvs login |
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( enter the CVS password: "cvsanon" ) |
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$ cvs co MITgcm MITgcm_contrib |
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</pre> |
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|
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<p>Note that you will only need to perform the "cvs login" once. And for |
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convenience, you may want to add the CVSROOT variable to your shell's |
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environment (that is, define it within your "~/.bashrc" or "~/.chsrc" |
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files).</p> |
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|
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<h4>Getting Parts of the Source "Tree"</h4> |
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<p>The above commands demonstrate how to check out all of the MITgcm code |
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and the "contributed" (that is, unsupported by often useful) information |
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within the "MITgcm_contrib" directory. In many cases, this is overkill |
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and can result in long download times. To reduce the volume of |
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information downloaded and thereby speedup the download times, one can |
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select one of the following pre-defined "aliases" that will provide a |
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sub-set of the entire MITgcm source "tree":</p> |
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|
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<table align="center" border="0" cellpadding="10" width="90%" summary="CVS |
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aliases"> |
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<tr bgcolor="#00cccc"> |
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<td width="25%">Alias Name</td> |
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<td>Information (directories) Contained</td> |
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</tr> |
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<tr bgcolor="#bbffdd"> |
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<td width="25%">MITgcm_code</td> |
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<td>Only the source code -- none of the verification examples.</td> |
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</tr> |
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<tr bgcolor="#bbddff"> |
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<td width="25%">MITgcm_verif_basic</td> |
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<td>Source code plus a small set of the verification examples |
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("global_ocean.90x40x15", "aim.5l_cs", "hs94.128x64x5", |
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"front_relax", and "plume_on_slope").</td> |
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</tr> |
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<tr bgcolor="#bbffdd"> |
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<td width="25%">MITgcm_verif_atmos</td> |
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<td>Source code plus all of the atmospheric examples.</td> |
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</tr> |
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<tr bgcolor="#bbddff"> |
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<td width="25%">MITgcm_verif_ocean</td> |
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<td>Source code plus all of the oceanic examples.</td> |
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</tr> |
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<tr bgcolor="#bbffdd"> |
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<td width="25%">MITgcm_verif_all</td> |
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<td>Source code plus all of the verification examples.</td> |
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</tr> |
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</table> |
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<h4>Getting Specific Releases or "Checkpoints"</h4> |
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<p>As shown within the <a |
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href="http://dev.mitgcm.org/cgi-bin/viewcvs.cgi/MITgcm/doc/tag-index"> CVS |
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Code Browser</a>, the MITgcm code is continuously undergoing updates. At |
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points during the development (typically, after work has been done and the |
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source code has passed the <a href="testing/latest.html">verification |
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tests</a>), a release or checkpoint "tag" is created. These tags are a |
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convenient mechanism for referring to different times or points within the |
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development. One can check out these versions using the "-r TAG_NAME" CVS |
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option such as: </p> |
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|
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<pre> |
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$ cvs co -r release1_p5 MITgcm |
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$ cvs co -r checkpoint52a_post MITgcm |
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</pre> |
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<p>By default (that is, when no tag is specified), CVS will retrieve the |
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latest version of all files.</p> |
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<h4>Show changes that YOU have made</h4> |
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<p>If you are running into difficulties it is very useful to see the changes |
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that you yourself have made since obtaining the code. From within |
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your working directory:</p> |
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<pre> |
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cvs diff |
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</pre> |
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<p>will show the differences between your version and the version that you |
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checked out. It acts recursively on all directories below your current |
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directory. You can limit the operation to just one file or directory by |
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specifying those as arguments:</p> |
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<pre> |
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cvs diff <i>file</i> |
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</pre> |
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<h4>Show changes to the repository that you don't have</h4> |
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<p>The source code evolves continuously and you should try to stay up to |
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date. To see what needs to be updated:</p> |
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<pre> |
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cvs -n update |
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</pre> |
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<p>behaves just as "cvs update" but doesn't actually change anything. This |
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is a useful way of summarizing the state of your code. The meaning of the |
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output is summarized in the next topic.</p> |
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<h4>Getting updates from the repository</h4> |
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<p>You can download and merge updates from the repository to bring you |
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working code up to date:</p> |
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<pre> |
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cvs update -d -P |
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</pre> |
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<p>will work recursively on all files in the current directory and below. |
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To update just a specific file or directory:</p> |
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<pre> |
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cvs update <i>file</i> |
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</pre> |
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<p>You can also update to a specific version, just as you could check out |
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a specific version.</p> |
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<pre> |
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cvs update -d -P -r release1_p5 |
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</pre> |
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<p>If you checked out a specific version and want to update to the very |
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latest use the -A option will remove associated with a specific version as |
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follows:</p> |
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<pre> |
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cvs update -d -P -A |
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</pre> |
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<p>"cvs update" produces output to the terminal with the following |
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meanings:</p> |
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<table align="center" border="0" cellpadding="10" width="90%" summary="CVS |
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update codes"> |
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<tr bgcolor="#00cccc"> |
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<td width="20%">Return Code</td> |
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<td>Description</td> |
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</tr> |
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<tr bgcolor="#bbffdd"> |
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<td width="20%">U <i>file</i></td> |
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<td>indicates that <i>file</i> was brought up to date with the |
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repository or that it exists in the repository but not in your work |
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space</td> |
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</tr> |
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<tr bgcolor="#bbddff"> |
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<td width="20%">P <i>file</td> |
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<td>does exactly as above but uses the "patch" method</td> |
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</tr> |
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<td width="20%">M <i>file</i></td> |
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<td>means the <i>file</i> was modified in your work space. Any |
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additional changes from the repository were merged in |
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successfully</td> |
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</tr> |
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</tr> |
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<tr bgcolor="#bbddff"> |
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<td width="20%">C <i>file</i></td> |
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<td>means a merge is necessary because both the your copy and the |
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repository have changed <b>but</b> there is a conflict between the |
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changes</td> |
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</tr> |
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<tr bgcolor="#bbffdd"> |
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<td width="20%">? <i>file</i></td> |
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<td>means the file exists in your work space but not on the |
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repository</td> |
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</tr> |
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</table> |
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<p>When conflicts arise, the sections of code are both kept and surrounded |
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by <<<<<, ===== and >>>>> indicators. You need to examine |
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these lines of the files and resolve the conflict.</p> |
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<h4>Wow! CVS is so good, where can I learn more?</h4> |
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<p>The <a href="http://www.loria.fr/~molli/cvs/doc/cvs_toc.html">basic |
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manual</a> is a good reference. There is also an <a |
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href="http://web.mit.edu/afs/athena.mit.edu/project/gnu/doc/html/cvs_toc.html">online |
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tutorial</a> as well as an <a |
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href="http://www.loria.fr/~molli/cvs/cvstrain/cvstrain.html">training |
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manual</a>. For those who prefer the good old fashioned book there's <a |
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href="http://cvsbook.red-bean.com/">"Open Source Development With |
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CVS"</a>.</p> |
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