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Once bug 361067 is fixed, we will be poised to move up to a more recent "p2 publisher" that specifies greedy=false for optional dependencies. (If not specified, p2 assumes greedy=true). See bug 247099 and http://wiki.eclipse.org/Equinox/p2/Publisher for some background and descriptions of this issue. I think we will get the desired publishing behavior "for free" (once we move up) but, this might impact some Orbit bundles where greedy=true is required. I am not aware of any such cases ... but this bug will serve as a good place to document general issues on this topic, if any are found.
This build is the first one on 'downloads' with the non-greedy metadata http://download.eclipse.org/tools/orbit/downloads/drops/I20120119143614/ FWIW, the build I used for the new p2 publisher was the Eclipse SDK from Juno M4, S-3.8M4-201112091447
I have confirmed the list of plugins are the same, and have same version, qualifiers ... all 540 jars and all 517 pack.gz files. The artifacts.xml file contains the same sort of minor size differences as mentioned in bug 361067. A side note, we do use the p2.mirror task and comparator in our builds ... so, I guess we could confirm that anything that has not changed since previous release is not "changing size" since metadata should be reused as well as the artifact. I'll put that on my "nice to do list" :) The content.xml file changed substantially, as expected, with a whole lot of greedy='false' added. While more testing will occur, I'll count this as "fixed".
I will add, I hope if people "downstream" have issues due to this change, it would be nice to document those issues here, just to better understand the impact, and perhaps one person's experience will help other people adjusting to the change ... if any adjustment is required.
For what its worth, WTP has done a test build with this new Orbit repo and all went well. First, no direct effect of anything being omitted (showing WTP wasn't making any accidental hidden assumptions that depended on greedy installation) and second, the greedy='false' attribute for the Orbit bundles that are "included" in WTP maintained their greedy='false' attribute (showing that PDE build and WTP's build all work as expected to maintain the original IU's metadata).
