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It would make generating patches for Eclipse products that much easier if the source bundles contained team/repository information (CVS/.svn). That way, when importing a source project, you'd already have the right version identifiers with the files, and could immediately generate patches based on those versions. This would need to be done at a global level, rather than on a per-plugin basis, so amending the build to include these files (e.g. by supplying a parameter) could make it a painless process for most plugins.
This information is available on the build page, for example http://download.eclipse.org/eclipse/downloads/drops/R-3.3-200706251500/directory.txt It would make sense to provide a patch for the latest version in HEAD, or an active maintenance branch. The build you may have downloaded may not have the latest changes. In any case, the source bundles included with the SDK are automatically generated by PDE build, not the releng scripts themselves.
Although the information is available on an external website, you ideally want it to be in the source bundles too. I'll move it to PDE.
*** This bug has been marked as a duplicate of bug 243582 ***