ctm.html

FreeBSD操作系统的详细使用手册

<p>As a developer one would like to experiment with and change files in the source tree.
<b class="APPLICATION">CTM</b> supports local modifications in a limited way: before
checking for the presence of a file <tt class="FILENAME">foo</tt>, it first looks for <tt
class="FILENAME">foo.ctm</tt>. If this file exists, <b class="APPLICATION">CTM</b> will
operate on it instead of <tt class="FILENAME">foo</tt>.</p>

<p>This behavior gives us a simple way to maintain local changes: simply copy the files
you plan to modify to the corresponding file names with a <tt class="FILENAME">.ctm</tt>
suffix. Then you can freely hack the code, while <b class="APPLICATION">CTM</b> keeps the
<tt class="FILENAME">.ctm</tt> file up-to-date.</p>
</div>

<div class="SECT2">
<h2 class="SECT2"><a id="AEN39766" name="AEN39766">A.4.6 Other Interesting <b
class="APPLICATION">CTM</b> Options</a></h2>

<div class="SECT3">
<h3 class="SECT3"><a id="AEN39769" name="AEN39769">A.4.6.1 Finding Out Exactly What Would
Be Touched by an Update</a></h3>

<p>You can determine the list of changes that <b class="APPLICATION">CTM</b> will make on
your source repository using the <var class="OPTION">-l</var> option to <b
class="APPLICATION">CTM</b>.</p>

<p>This is useful if you would like to keep logs of the changes, pre- or post- process
the modified files in any manner, or just are feeling a tad paranoid.</p>
</div>

<div class="SECT3">
<h3 class="SECT3"><a id="AEN39776" name="AEN39776">A.4.6.2 Making Backups Before
Updating</a></h3>

<p>Sometimes you may want to backup all the files that would be changed by a <b
class="APPLICATION">CTM</b> update.</p>

<p>Specifying the <var class="OPTION">-B backup-file</var> option causes <b
class="APPLICATION">CTM</b> to backup all files that would be touched by a given <b
class="APPLICATION">CTM</b> delta to <tt class="FILENAME">backup-file</tt>.</p>
</div>

<div class="SECT3">
<h3 class="SECT3"><a id="AEN39785" name="AEN39785">A.4.6.3 Restricting the Files Touched
by an Update</a></h3>

<p>Sometimes you would be interested in restricting the scope of a given <b
class="APPLICATION">CTM</b> update, or may be interested in extracting just a few files
from a sequence of deltas.</p>

<p>You can control the list of files that <b class="APPLICATION">CTM</b> would operate on
by specifying filtering regular expressions using the <var class="OPTION">-e</var> and
<var class="OPTION">-x</var> options.</p>

<p>For example, to extract an up-to-date copy of <tt
class="FILENAME">lib/libc/Makefile</tt> from your collection of saved <b
class="APPLICATION">CTM</b> deltas, run the commands:</p>

<pre class="SCREEN">
<samp class="PROMPT">#</samp> <kbd
class="USERINPUT">cd /where/ever/you/want/to/extract/it/</kbd>
<samp class="PROMPT">#</samp> <kbd
class="USERINPUT">ctm -e '^lib/libc/Makefile' ~ctm/src-xxx.*</kbd>
</pre>

<p>For every file specified in a <b class="APPLICATION">CTM</b> delta, the <var
class="OPTION">-e</var> and <var class="OPTION">-x</var> options are applied in the order
given on the command line. The file is processed by <b class="APPLICATION">CTM</b> only
if it is marked as eligible after all the <var class="OPTION">-e</var> and <var
class="OPTION">-x</var> options are applied to it.</p>
</div>
</div>

<div class="SECT2">
<h2 class="SECT2"><a id="AEN39808" name="AEN39808">A.4.7 Future Plans for <b
class="APPLICATION">CTM</b></a></h2>

<p>Tons of them:</p>

<ul>
<li>
<p>Use some kind of authentication into the <b class="APPLICATION">CTM</b> system, so as
to allow detection of spoofed <b class="APPLICATION">CTM</b> updates.</p>
</li>

<li>
<p>Clean up the options to <b class="APPLICATION">CTM</b>, they became confusing and
counter intuitive.</p>
</li>
</ul>
</div>

<div class="SECT2">
<h2 class="SECT2"><a id="AEN39820" name="AEN39820">A.4.8 Miscellaneous Stuff</a></h2>

<p>There is a sequence of deltas for the <var class="LITERAL">ports</var> collection too,
but interest has not been all that high yet.</p>
</div>

<div class="SECT2">
<h2 class="SECT2"><a id="MIRRORS-CTM" name="MIRRORS-CTM">A.4.9 CTM Mirrors</a></h2>

<p><a href="ctm.html">CTM</a>/FreeBSD is available via anonymous FTP from the following
mirror sites. If you choose to obtain <b class="APPLICATION">CTM</b> via anonymous FTP,
please try to use a site near you.</p>

<p>In case of problems, please contact the <a
href="http://lists.FreeBSD.org/mailman/listinfo/ctm-users" target="_top">ctm-users</a>
mailing list.</p>

<div class="VARIABLELIST">
<dl>
<dt>California, Bay Area, official source</dt>

<dd>
<ul>
<li>
<p><a href="ftp://ftp.FreeBSD.org/pub/FreeBSD/development/CTM/"
target="_top">ftp://ftp.FreeBSD.org/pub/FreeBSD/development/CTM/</a></p>
</li>
</ul>
</dd>

<dt>South Africa, backup server for old deltas</dt>

<dd>
<ul>
<li>
<p><a href="ftp://ftp.za.FreeBSD.org/pub/FreeBSD/CTM/"
target="_top">ftp://ftp.za.FreeBSD.org/pub/FreeBSD/CTM/</a></p>
</li>
</ul>
</dd>

<dt>Taiwan/R.O.C.</dt>

<dd>
<ul>
<li>
<p><a href="ftp://ctm.tw.FreeBSD.org/pub/FreeBSD/development/CTM/"
target="_top">ftp://ctm.tw.FreeBSD.org/pub/FreeBSD/development/CTM/</a></p>
</li>

<li>
<p><a href="ftp://ctm2.tw.FreeBSD.org/pub/FreeBSD/development/CTM/"
target="_top">ftp://ctm2.tw.FreeBSD.org/pub/FreeBSD/development/CTM/</a></p>
</li>

<li>
<p><a href="ftp://ctm3.tw.FreeBSD.org/pub/FreeBSD/development/CTM/"
target="_top">ftp://ctm3.tw.FreeBSD.org/pub/FreeBSD/development/CTM/</a></p>
</li>
</ul>
</dd>
</dl>
</div>

<p>If you did not find a mirror near to you or the mirror is incomplete, try to use a
search engine such as <a href="http://www.alltheweb.com/"
target="_top">alltheweb</a>.</p>
</div>
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