Our builds create and modify files and can then fail before they are checked in or deleted. These files pose merge and other issues for subsequent builds. We do not want Bamboo to clean out the directory and start anew because a full checkout takes 45 minutes. We would like Bamboo instead to perform the following before issuing svn update:

svn --non-interactive cleanup
svn --non-interactive resolve -R --accept working .
svn --non-interactive revert -R .

Since "revert" does not have an option to remove files and directories that are not in SVN, we would like Bamboo to do that too.