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200 lines
9.1 KiB
Plaintext
<!--
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# This is the sgml version of the ctm.FAQ file.
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#
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# Converted by Ollivier Robert <roberto@FreeBSD.ORG>
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#
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# $Id: ctm.sgml,v 1.6 1996/01/31 14:26:00 mpp Exp $
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#
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# ----------------------------------------------------------------------------
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# "THE BEER-WARE LICENSE" (Revision 42):
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# <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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# can do whatever you want with this stuff. If we meet some day, and you think
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# this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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# ----------------------------------------------------------------------------
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#
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-->
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<sect><heading>CTM<label id="ctm"></heading>
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<p><em>Contributed by &a.phk;. Updated 16-Mar-1995.</em>
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<tt/CTM/ is a method for keeping a remote directory tree in sync with a
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central one. It has been developed for usage with FreeBSD's source
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trees, though other people may find it useful for other purposes as
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time goes by. Little, if any, documentation currently exists at
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this time on the process of creating deltas, so talk to &a.phk;
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for more information should you wish to use <tt/CTM/ for other things.
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<sect1><heading>Why should I use <tt/CTM/?</heading>
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<p><tt/CTM/ will give you a local copy of the ``FreeBSD-current''
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sources. If you are an active developer on FreeBSD, but have lousy
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or non-existent TCP/IP connectivity, <tt/CTM/ was made for you.
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You will need to transfer up to four deltas per day (or you can
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have them arrive in email automatically), the sizes for which are
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always kept as small as possible. This is typically less than 5K,
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with the occasional (one in ten) being 10-50K and every now and
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then a biggie of 100K+ or more coming around.
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You will also need to make yourself aware of the various caveats in
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running ``current'' sources, and for this it is recommended that
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you read <ref id="current" name="Staying current with FreeBSD">.
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<sect1><heading>What do I need to use <tt/CTM/?</heading>
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<p>You will need two things: The ``<tt/CTM/'' program and the initial
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deltas to feed it (to get up to ``current'' levels).
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The <tt/CTM/ program has been part of FreeBSD ever since version 2.0
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was released, and lives in <tt>/usr/src/usr.sbin/<tt/CTM/</tt> if you
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have a copy of the source online.
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If you are running a pre-2.0 version of FreeBSD, you can fetch the
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current <tt/CTM/ sources directly from:
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<url
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url="ftp://ftp.freebsd.org/pub/FreeBSD/FreeBSD-current/src/usr.sbin/ctm">
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The ``deltas'' you feed <tt/CTM/ can be had two ways, FTP or e-mail.
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If you have general FTP access to the Internet then the following
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FTP sites support access to <tt/CTM/:
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<url url="ftp://freefall.cdrom.com/pub/CTM">
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FTP the relevant directory and fetch the <tt/README/ file,
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starting from there.
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If you only have access to electronic mail or are otherwise blocked
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from using FTP then you may wish to get your deltas via email:
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Send email to <tt/<majordomo@freebsd.org>/ to subscribe to
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the list ``ctm-src-cur''. (If you do not know how to subscribe
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yourself using majordomo, send a message first containing the
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word ``help'' - it will send you back usage instructions.)
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When you begin receiving your <tt/CTM/ updates in the mail, you may
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use the <tt/ctm_rmail/ program to unpack and apply them. You
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can actually use the <tt/ctm_rmail/ program directly from a entry
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in <tt>/etc/aliases</tt> if you want to have the process run in a
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fully automated fashion. Check the <tt/ctm_rmail/ man page for more
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details.
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<bf/NOTE/: No matter what method you use to get the <tt/CTM/
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deltas, you should subscribe to the <tt/ctm-announce@freebsd.org/
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mailing list. In the future, this will be the only place where
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announcements concerning the operations of the <tt/CTM/ system will be
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posted. Send an email to <tt/majordomo@freebsd.org/ with a single
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line of ``<tt/subscribe ctm-announce/'' to get added to the list.
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<sect1><heading>Starting off with <tt/CTM/ for the first time</heading>
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<p>Before you can start using <tt/CTM/ deltas, you will need to get a
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special ``base'' delta that provides the starting point for all
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deltas produced subsequently to it.
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You can recognize a base delta by the ``<tt/A/'' appended to the
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number (<tt/src-cur.0341A.gz/ for instance). As a rule a base
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delta is produced every 100 deltas, the next one will be
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<tt/src-cur.0400A.gz/. By the way, they are large! 25 to 30
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Megabytes of <tt/gzip/'ed data is common for a base delta.
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If you do have the 2.0-RELEASE <tt/srcdist/, you can instead
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retrieve the <tt/src-cur.0372R20.gz/ file, it's only 4Mb and it
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will take you to current from the 2.0-RELEASE sources.
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Once you've picked a base delta to start from, you will also need
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all deltas with higher numbers following it.
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<sect1><heading>Using <tt/CTM/ in your daily life</heading>
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<p>To apply the deltas, simply say
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<verb>
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cd /where/ever/you/want/the/stuff
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ctm -v -v /where/you/store/your/deltas/src-cur.*
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</verb>
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<tt/CTM/ understands deltas which have been put through <tt/gzip/,
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so you don't need to gunzip them first, this saves disk space.
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Unless it feels very secure about the entire process, <tt/CTM/ will
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not touch your tree. To verify a delta you can also use the
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``<tt/-c/'' flag and <tt/CTM/ won't actually touch your tree; it will
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merely verify the integrity of the delta and see if it would apply
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cleanly to your current tree.
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There are other options to <tt/CTM/ as well, look in the sources
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for more details.
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I would also be very happy if somebody could help with the ``user
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interface'' portions, as I have realized that I can't make up my
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mind on what options should do what, how and when...
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That's really all there is to it. Every time you get a new delta,
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just run it through <tt/CTM/ to keep your sources up to date.
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Don't remove the deltas if they are hard to download again. You
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just might want to keep them around in case something bad happens.
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Even if you only have floppy disks, consider using <tt/fdwrite/ to
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make a copy.
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<sect1><heading>Future plans for <tt/CTM/</heading>
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<p>
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Tons of them:
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<itemize>
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<item>
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Make local modifications to the tree possible. One way to do
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it could be this:<p> When <tt/CTM/ wants to edit the file
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``<tt>foo/bar.c</tt>'', it would first check for the existence
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of <tt>foo/bar.c#CTM</tt> If this file exists, the delta is
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applied to it instead. This way the <tt>foo/bar.c</tt> file
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can be edited to suit local needs.
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<item>
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Make a ``restore file(s)'' option to <tt/CTM/, something like:
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<verb>
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ctm -r src/sys/i386/wd.c /here/are/my/deltas/src-cur.*
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</verb>
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would restore <tt/wd.c/ to the current status from the files.
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<item>
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Clean up the options to <tt/CTM/, they became confusing and
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counter intuitive.
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</itemize>
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The bad news is that I am very busy, so any help in doing this will
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be most welcome. And don't forget to tell me what you want also...
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<sect1><heading>Miscellaneous stuff</heading>
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<p>
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All the ``DES infected'' (e.g. export controlled) source is not
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included. You will get the ``international'' version only. If
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sufficient interest appears, we will set up a ``<tt/sec-cur/''
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sequence too.
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If you are a frequent or valuable contributor to FreeBSD, I will be
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willing to arrange special services, one option is delivery via
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<tt/ftp/ or <tt/rcp/ to a machine closer to you. You need to have
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earned this, since it takes time to do, but I'll be all the more
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happy to do it for you then.
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There is a sequence of deltas for the <tt/ports/ collection too,
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but interest has not been all that high yet. Tell me if you want
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an email list for that too and we'll consider setting it up.
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If you have commit privileges or are similarly authorized by the
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FreeBSD core team, you can also get access to the CVS repository
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tree by the same means. Contact &a.phk;
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for details.
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<sect1><heading>Thanks!</heading>
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<p>
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<descrip>
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<tag/Bruce Evans/
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for his pointed pen and invaluable comments.
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<tag/Søren Schmidt/
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for patience.
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<tag/Stephen McKay/
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wrote <tt/ctm_[rs]mail/, much appreciated.
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<tag/Jordan Hubbard/
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for being so stubborn that I had to make it better.
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<tag/All the users/
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I hope you like it...
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</descrip>
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