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[p2-dev] p2 profile registry format changes

In Galileo SR1 and Helios streams, a change was made in p2 to compress the profile registry stored on disk [1]. This was a big improvement in the amount of disk space used by p2 metadata in user installs (roughly 10x reduction of profile registry size). However, we discovered that people have written tools that manually read or edit the profile registry stored on disk, and were therefore broken by this change. Although these are internal metadata files and we don't make attempts to maintain consistency of these file formats across releases, we want to give people a heads up about this upcoming change in p2. In addition, a new system property has been introduced that you can use to revert to the profile registry format used in previous releases, if desired (for example in config.ini):


Of course using this flag you lose the benefit of profile compression, but it maintains compatibility for those manually parsing/editing these files.


[1] - https://bugs.eclipse.org/bugs/show_bug.cgi?id=259946