50 lines
2.2 KiB
Text
50 lines
2.2 KiB
Text
<!-- $Id: synching.sgml,v 1.9 1997-02-22 12:59:32 peter Exp $ -->
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<!-- The FreeBSD Documentation Project -->
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<chapt><heading>Synchronizing source trees over the Internet<label id="synching"></heading>
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<p><em>Contributed by &a.jkh;.</em>
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<!--
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Last updated: $Date: 1997-02-22 12:59:32 $
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This document tries to describe the various ways in which a user may
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use the internet to keep development sources in synch.
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-->
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<p>There are various ways of using an Internet (or email) connection
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to stay up-to-date with any given area of the FreeBSD project sources,
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or all areas, depending on what interests you. The primary
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services we offer are CVSup and CTM.
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<p><bf>CVSup</bf> is the new kid on the block, it does everything that sup
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did and more, doing it also far more efficiently in terms of its demands
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on server disk space and network resources. Because of this, CVSup has
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largely replaced <ref id="sup"> in the FreeBSD Project. Like sup, it also
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operates on a <em>pull</em> synchronization model.
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<p><bf>CTM</bf>, on the other hand, does not interactively compare
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the sources you have with those on the master archive. Instead, a script
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which identifies changes in files since its previous run is executed several
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times a day on the master archive, any detected changes being compressed,
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stamped with a sequence-number and encoded for transmission over email
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(printable ASCII only). Once received, these "CTM deltas" can then be
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handed to the ctm_rmail(1) utility which will automatically decode, verify
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and apply the changes to the user's copy of the sources. This process is
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far more efficient than CVSup, and places less strain on our server resources
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since it is a <em>push</em> rather than a <em>pull</em> model.
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<p>There are other trade-offs, of course. With CVSup, you can also
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inadvertently wipe out portions of your archive and CVSup will detect
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and rebuild the damaged portions for you. CTM won't do this, and if
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you wipe some portion of your source tree out (and don't have it backed
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up) then you will have to start from scratch (from the most recent CVS
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"base delta") and rebuild it all.
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For more information on CTM, CVSup or the now largely-obsolete sup, please
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see one of the following sections:
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&ctm;
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&cvsup;
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⊃
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