BundlesAction, strange instruction zipped=true

[laeubi]

I'm currently plying around with the meta-data generation of Tycho and noticed that for a BundleInfo created from a directory, P2 generates a strange

<instructions size='2'>
        <instruction key='zipped'>
          true
        </instruction>

This is done here https://github.com/eclipse-equinox/p2/blob/master/bundles/org.eclipse.equinox.p2.publisher.eclipse/src/org/eclipse/equinox/p2/publisher/eclipse/BundlesAction.java in Line 326.

I don't understand what this touchpoint is supposed to do? Should it "zip the directory" when published?

[mickaelistria]

Should it "zip the directory" when published?

If I read the code correctly, this is added when Eclipse-BundleShape: dir in the MANIFEST.MF, so I believe a better interpretation would be that the jar must be unzipped and turned into a directory during installation.