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RE: Bug: "svnadmin dump --incremental --deltas" gives too much output

From: Paul Charlton <techguru_at_byiq.com>
Date: Tue, 30 Sep 2008 10:24:34 -0700

for completeness, the doc comment in "svn_repos.h" covers the behavior of "--deltas" accurately, in that it states:


* If @a use_deltas is @c TRUE, output only node properties which have

 * changed relative to the previous contents, and output text contents

 * as svndiff data against the previous contents. Regardless of how

 * this flag is set, the first revision of a non-incremental dump will

 * be done with full plain text. A dump with @a use_deltas set cannot

 * be loaded by Subversion 1.0.x.


(emphasis added)



-----Original Message-----
From: C. Michael Pilato [mailto:cmpilato_at_collab.net]
Sent: Tuesday, September 30, 2008 9:29 AM
To: dev_at_subversion.tigris.org
Subject: Re: Bug: "svnadmin dump --incremental --deltas" gives too much output


Vincent Lefevre wrote:

> On 2008-09-30 08:08:01 -0700, Paul Charlton wrote:

>> Assume 2 revisions: (n), (n-1), containing just a few text files.

>> "dump" must export "(n):full text" (to recreate a baseline) and also

>> the difference of (n):(n-1)


> No, the baseline can be obtained from the previous revisions.

> "dump" does not behave as you say: try it!


Vincent, I think you understand the --incremental and --deltas option intents, but for the sake of others in this thread, allow me to clarify:


   * With no options, the first revision dumped by 'svnadmin dump' will

     contain a complete listing of every directory and file in the

     repository, the files' fulltext contents, all properties, etc.

     Subsequent dumped revisions have the same but only for files and

     directories changed in that revision.


   * All that --incremental does is make that first dumped revision

     like the others by only representing the files/dirs changed in that



   * --deltas causes 'svnadmin dump' to use binary deltas instead of

     fulltexts to represent file contents.


Sadly, 'svnadmin help's usage message isn't very helpful, because it uses "diff vs. fulltext" to describe for --incremental instead of "changed paths vs. all paths".


C. Michael Pilato <cmpilato_at_collab.net>
CollabNet   <>   www.collab.net   <>   Distributed Development On Demand
Received on 2008-09-30 19:24:48 CEST

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