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Develop a new tool (named preupg-diff) that would compare multiple Preupgrade Assistant XML reports from which one would be "new" (not analyzed by anybody) with unknown issues and the others would be already analyzed.

The tool would help to find new issues that emerged in the new report by filtering out those results that are the same in the new report and at least in one of the analyzed XMLs. The trimmed report should be output in XML and HTML format.

Prepared in upstream: https://github.com/upgrades-migrations/preupgrade-assistant/pull/216

preupgrade-assistant-2.3.3-2.el6: Ran some rudimentary tests manually with real modules, as well as few cases of automated modules.  All seems fine.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2017-0819.html