June 2004
Intermediate to advanced
319 pages
12h 58m
English
Content preview from Version Control with Subversion
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Chapter 4: Branching and Merging
That was the hard part—the research. Now that you know what you want to restore,
you have two different choices.
One option is to use
svn merge to apply revision 808 in reverse. (We’ve already dis-
cussed how to undo changes; see “Undoing Changes” earlier in this chapter.) This
would have the effect of re-adding real.c as a local modification. The file would be
scheduled for addition, and after a commit, the file would again exist in
HEAD.
In this particular example, however, this is probably not the best strategy. Reverse-
applying revision 808 would not only schedule real.c for addition, but the log mes-
sage indicates that it would also undo certain changes to integer.c, which you don’t
want. Certainly, you could reverse-merge revision 808 and then
svn revert the local
modifications to integer.c, but this technique doesn’t scale well. What if there were
90 files changed in revision 808?
A second, more targeted strategy is not to use
svn merge at all, but rather the svn
copy
command. Simply copy the exact revision and path coordinate pair from the
repository to your working copy:
$ svn copy --revision 807 \
http://svn.example.com/repos/calc/trunk/real.c ./real.c
$ svn status
A + real.c
$ svn commit -m "Resurrected real.c from revision 807, /calc/trunk/real.c." ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.