[tycho-user] Subproject produces "eclipse-repository" packaging, but Ecl

["David M. Karr" <davidmichaelkarr@xxxxxxxxx>]

I inherited a largish Eclipse plugin codebase 
(https://github.com/davidmichaelkarr/yang-ide), and the original authors 
deployed the resulting Tycho-built update site to a public site 
(http://dl.xored.com/yang/releases), and installing the plugin from 
there works fine.

Maven says that the entire tree builds successfully.  I can successfully 
test the plugin by launching a test instance, loading the associated 
plugins.

Now I'm attempting to install the built update site in an existing 
Eclipse instance.  I've tried defining the update site in Eclipse by 
selecting the "update-site/target/<basename>.zip" from the "Archive" 
button, and also "update-site/target/repository" from the "Local" button.

When I select this update site in "Install New Software", I'm able to 
select the one feature, then click "Finish" on the "Install Details" 
page, but the next page always reports this:
--------------------
An error occurred during the 
org.eclipse.equinox.internal.p2.engine.phases.CheckTrust phase.
session context was:(profile=_home_opnfv_eclipse_java-neon_eclipse, 
phase=org.eclipse.equinox.internal.p2.engine.phases.CheckTrust, 
operand=, action=).
Error reading signed content.
error in opening zip file
----------------------

The other curious, and perhaps telling, symptom is that on the "Install 
Details" page, when it lists the plugins to be installed, there is a 
block below which has a "Size:" label.  This says "0 bytes".  I don't 
know what this indicates, if anything.

I'm not familiar with the required structure of an update site, so I 
don't know what might be wrong.  Maven doesn't complain when it builds 
this module.

What else can I look at to diagnose this?