===================================================================
RCS file: /cvsrepo/anoncvs/cvs/www/Attic/ctm.html,v
retrieving revision 1.28
retrieving revision 1.29
diff -c -r1.28 -r1.29
*** www/Attic/ctm.html	2005/05/22 18:00:10	1.28
--- www/Attic/ctm.html	2006/05/30 02:58:00	1.29
***************
*** 301,347 ****
  you will need for generated files during a build, i.e. compiling the sources.
  
  <p>
- If you just get the source tree, you will need to deal with local
- modifications.  One way to do this is to use the <b>union</b> filesystem,
- (see <a href="http://www.openbsd.org/cgi-bin/man.cgi?query=mount_union&amp;sektion=8">mount_union(8)</a>)
- although there have been reports that the <b>union</b> filesystem can be 
- unstable if both the upper and lower layers reside on the same physical 
- filesystem.  If you place your upper and lower layers on separate 
- filesystems you should have no problems.  A sample of this is as follows:
- 
- <p>
- Suppose your CTM-updated tree is in <tt><b>/usr/src-ctm</b></tt>, and
- your real source tree, the one you make your modifications to and do
- your builds from, is in <tt><b>/usr/src</b></tt>.
- <tt><b>/usr/src</b></tt> should be initially an empty directory.  The
- following command will set up the union mount:
- 
- <pre>
- 	mount -t union -o -b /usr/src-ctm /usr/src
- </pre>
- 
- <p>
- Modifications made to files in <tt><b>/usr/src</b></tt> will become a
- file contained within <tt><b>/usr/src</b></tt>, hiding the one in
- <tt><b>src-ctm</b></tt>.  If changes are made via CTM to the
- underlying <tt><b>src-ctm</b></tt> tree, those changes will <b>not</b>
- be seen if there is a file in the upper layer hiding it.
- 
- <p>
- You should periodically unmount the
- union and search for files which are local to the union filesystem.
- 
- <pre>
- 	umount /usr/src
- 	find /usr/src -type f
- </pre>
- 
- <p>
- The commands <tt><b>ls -W</b></tt> and <tt><b>rm -W</b></tt> will be
- useful too, as objects named "whiteouts" in <tt><b>/usr/src</b></tt>
- will also hide files in <tt><b>src-ctm</b></tt>.
- 
- <p>
  If you get the CVS repository, you can use the <tt><b>cvs checkout</b></tt>
  command to check out a source tree from it.  Each time you update
  with CTM you can use the <tt><b>cvs update</b></tt> command to
--- 301,306 ----
***************
*** 472,478 ****
  <a href="index.html"><img height="24" width="24" src="back.gif" border="0" alt="OpenBSD" /></a>
  <a href="mailto:www@openbsd.org">www@openbsd.org</a>
  <br>
! <small>$OpenBSD: ctm.html,v 1.28 2005/05/22 18:00:10 matthieu Exp $</small>
  
  </body>
  </html>
--- 431,437 ----
  <a href="index.html"><img height="24" width="24" src="back.gif" border="0" alt="OpenBSD" /></a>
  <a href="mailto:www@openbsd.org">www@openbsd.org</a>
  <br>
! <small>$OpenBSD: ctm.html,v 1.29 2006/05/30 02:58:00 krw Exp $</small>
  
  </body>
  </html>