svnadmin dump — Dump the contents of filesystem to stdout.
Dump the contents of filesystem to stdout in a
«dumpfile» portable format, sending feedback
to stderr. Dump revisions
LOWER rev through
UPPER rev. If no revisions are
given, dump all revision trees. If only
LOWER is given, dump that one
revision tree. See «Migrating a Repository»
for a practical use.
By default, the Subversion dumpfile stream contains a single revision (the first revision in the requested revision range) in which every file and directory in the repository in that revision is presented as if that whole tree was added at once, followed by other revisions (the remainder of the revisions in the requested range) which contain only the files and directories which were modified in those revisions. For a modified file, the complete fulltext representation of its contents, as well as all of its properties, are presented in the dumpfile; for a directory, all of its properties are presented.
There are a pair of useful options which modify the
dumpfile generator's behavior. The first is the
--incremental option, which simply causes
that first revision in the dumpfile stream to contain only
the files and directories modified in that revision,
instead of being presented as the addition of a new tree,
and in exactly the same way that every other revision in
the dumpfile is presented. This is useful for generating
a dumpfile that is to be loaded into another repository
which already has the files and directories that exist in
the original repository.
The second useful option is --deltas.
This switch causes svnadmin dump to,
instead of emitting fulltext representations of file
contents and property lists, emit only deltas of those
items against their previous versions. This reduces (in
some cases, drastically) the size of the dumpfile that
svnadmin dump creates. There are, however,
disadvantages to using this option—deltified
dumpfiles are more CPU intensive to create, cannot be
operated on by svndumpfilter, and tend
not to compress as well as their non-deltified counterparts
when using third-party tools like gzip
and bzip2.
Dump your whole repository:
$ svnadmin dump /usr/local/svn/repos SVN-fs-dump-format-version: 1 Revision-number: 0 * Dumped revision 0. Prop-content-length: 56 Content-length: 56 …
Incrementally dump a single transaction from your repository:
$ svnadmin dump /usr/local/svn/repos -r 21 --incremental * Dumped revision 21. SVN-fs-dump-format-version: 1 Revision-number: 21 Prop-content-length: 101 Content-length: 101 …