David Barr 7a75e661c5 vcs-svn: implement text-delta handling ... Handle input in Subversion's dumpfile format, version 3. This is the format produced by "svnrdump dump" and "svnadmin dump --deltas", and the main difference between v3 dumpfiles and the dumpfiles already handled is that these can include nodes whose properties and text are expressed relative to some other node. To handle such nodes, we find which node the text and properties are based on, handle its property changes, use the cat-blob command to request the basis blob from the fast-import backend, use the svndiff0_apply() helper to apply the text delta on the fly, writing output to a temporary file, and then measure that postimage file's length and write its content to the fast-import stream. The temporary postimage file is shared between delta-using nodes to avoid some file system overhead. The svn-fe interface needs to be more complicated to accomodate the backward flow of information from the fast-import backend to svn-fe. The backflow fd is not needed when parsing streams without deltas, though, so existing scripts using svn-fe on v2 dumps should continue to work. NEEDSWORK: generalize interface so caller sets the backflow fd, close temporary file before exiting Signed-off-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: David Barr <david.barr@cordelta.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>		2011-05-26 02:28:04 -05:00
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svn-fe.txt	vcs-svn: implement text-delta handling	2011-05-26 02:28:04 -05:00