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Can't say I understand it all, but I've noticed there is a ".blobstore" directory created in our final repository, which is approx 85 meg, as a result of our final mirror task (I think). According to comments in bug 312962, this is just a matter of specifying "format" attribute, naming the source directory from which to copy the format. This might save some time during the build itself, and allow us to create pack.gz files later (when we know we really need them, for any particular build).
This didn't really work, I assume because the "source" is a composite repository. I opened bug 317346 to complain :) But ... giving it more thought, I don't think we should "pack" during the build anyway ... since not every build needs to be distributed, its a waste of time. so that'd avoid the .blobstore anyway. I already have a separate p2.process.artifacts script that packs the repo (and, honestly, forgot I was calling pack during the build). But, do need to automate/test some of this, as is tracked in bug 316501.