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From what I've seen, Tycho will "compress" a content.xml or artifact.xml file to a jar file when creating it, but it does not set the "internal" property of compressed. For example, in compressed repositories, I normally see these attributes at the top of a content.jar file: <properties size='2'> <property name='p2.timestamp' value='1360014236577'/> <property name='p2.compressed' value='true'/> </properties> One advantage of having this as an attribute of the repository file, is that even if left as *.xml, say by hand editing, or other tools, that subsequent p2 operations will "know" to leave it in compressed (jar) form.
we set the compress flag using the p2 mirror app [1]. could also be a bug in the p2 mirror application [1] http://git.eclipse.org/c/tycho/org.eclipse.tycho.git/tree/tycho-bundles/org.eclipse.tycho.p2.tools.impl/src/main/java/org/eclipse/tycho/p2/tools/mirroring/MirrorApplicationServiceImpl.java#n179
using tycho demo app http://git.eclipse.org/c/tycho/org.eclipse.tycho-demo.git/tree/itp04-rcp I see the compressed=true property in the repository built.
Thanks for looking into it. I'm not saying you should do more work here (yet) but it might work in this case because its using a target repository? One that has the compressed property. I know in the past, the (way) we got this property set was to use a small repository to "copy properties from" ... I don't even know if p2 has a direct API to set it. Just FYI.
