Re: File UUIDs and equivalence

From: Andreas Kreß <andreas.kress_at_HOOD-Group.com>
Date: Fri, 7 Aug 2009 10:28:57 +0200

<div> Hi David, the same question kept me going round some time ago. We both know the reason why :) But the concept of svn is basically fixed to the idea of a logical "change" entity what is represented to us as an "commit". This idea seems having influenced implementation in a way what makes it no more easy to identify single object entities. One of the side effects is that building history of files is bound to traversals through log entries. I assume that a tremendous architectural change would be necessary to satisfy the demand to have single object entity identification. Ask Greg Stein, he should know it the best. cu, Andreas PS: nice to hear from you after this many years <div>Andreas Kreß HOOD Group Office München Keltenring 7 D-82041 Oberhaching phone:  00 49   89  45
12530 mobile: 00 49 173 676 8370 fax: 00 49 89 45125319 <a href="mailto:Andreas.Kress@HOOD-Group.com">Andreas.Kress@HOOD-Group.com</a> <a href="http://www.HOOD-Group.com">http://www.HOOD-Group.com</a> PGP Hash :6884BF8D77EAAE600510C4DD12E7A269FEE8B1E3 <div> </div>-----David Honey <david.honey@uk.ibm.com> wrote: ----- <blockquote style="border-left: 2px solid #000000; padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;">To: users@subversion.tigris.org From: David Honey <david.honey@uk.ibm.com> Date: 07/30/2009 05:52PM Subject: File UUIDs and equivalence When a user performs an
svn copy
of a directory, exactly the same versions of children are copied to the
destination directory. This means that the same file (or directory) version
might be located under many different paths of the repository. What I'm
looking for is a way to determine a UUID for a file or directory so that
when viewed from any of the paths (and peg revisions) in the repository
that use that same object, you would see the same UUID. However, I cannot
see any easy way of doing this.
 SVN must be keeping track of this internally.
If you show the log entries for the file under the copied directory, you
can see the entries for the copied parent directory as well as the log
where the file was originally created under its original path. However,
connecting all of these up are non trivial. Let me give an example:
 <tt>cd <workingcopy>/trunk
</tt> <tt>svn mkdir xxx
</tt> <tt>svn mkdir xxx/a
</tt> <tt>touch xxx/a/xxx.txt
</tt> <tt>svn add xxx/a/xxx.txt
</tt> <tt>svn mkdir xxx/b
</tt> <tt>touch xxx/b/xxx.txt
</tt> <tt>svn add xxx/b/xxx.txt
</tt> <tt>svn commit -m "setup example start"
</tt> <tt>svn mkdir yyy
</tt> <tt>svn copy xxx/a yyy
</tt> <tt>svn commit -m "copy dir"
</tt> <tt>svn rename yyy zzz
</tt> <tt>svn commit -m "rename dir"
</tt> Now at this point, file at the repository
path /trunk/zzz/a/xxx.txt is the same object as at /trunk/xxx/a/xxx.txt.
However, determining this does not appear to be easy. If you do:
 <tt>svn log zzz/a/xxx.txt
</tt> you can see the changes going back to
the first revision. But it's not obvious which of the two files named xxx.txt
in that log correspond to one under
zzz/a
.
 Is there an easy way of doing this?
 For example, if there was a UUID for
files and directories, it would be trivial. But I cannot find anything
equivalent.
 Or is it as brutal as having to traverse
not only the logs but also the parents and their logs?
 The background behind the question is
about exchanging data with other tools and avoiding creating duplicate
objects in those tools for what are essentially the same object with the
same set of SVN properties.
 Thanks,
 David.
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Received on 2009-08-07 10:50:08 CEST

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