xdelta

Re: SVN teaser

SVN 125 has a new XDELTA environment variable for passing flags off the command-line, so you can use xdelta3 in conjunction with tar:

export XDELTA
XDELTA="-s source-1.tar"
TAR="tar --use-compress-program=xdelta3"
$TAR -cvf source-1-source2.tar.vcdiff source-2/
...
$TAR -xvf source-1-source2.tar.vcdiff source-2/file

This creates/extracts-from a delta-compressed tar file, without using intermediate files.