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[p2-dev] Install features & bundles to separate location than RCP product

Hi,
 
I have an RCP product that installs and uninstalls features/bundles just fine when running from a traditional, Eclipse-like installation. Using logic similar to the following article, it headlessly performs updates from a repo site, modifies the product's "p2", "features", and "plugins" directories accordingly, and starts the installed bundles (as applicable):
 
    http://wiki.eclipse.org/Equinox/p2/Adding_Self-Update_to_an_RCP_Application#Headless_Updating_on_Startup
 
The problem is that the product also needs to perform the provisioning operations from a read-only installation on a shared network folder. For many of its users, the installed product doesn't have the luxury of writing to its "p2", "features", and "plugins" directories.
 
Handling the p2 directory seems easy enough. All I need is a script that copies the p2 directory from the read-only installation to a writable local path and specifies the new location via eclipse.p2.data.area property.
 
The other directories are a different issue, however. Install operations fail because they're trying to write to the read-only installation's features and plugins directories. I can't seem to find another configuration property to specify an alternate location for the installed features and plugins. Although a number of articles and blogs entries about shared locations and bundle pooling seemed promising, they appeared to deal with the command-line director application.
 
Again, my product's installations are performed programmically via InstallOperations and ProvisioningJobs in conjunction with the simple configurator. I'd think that there were some simple configuration property to point them at an alternate installation path. I certainly hope that it doesn't require Java code changes and/or a different product build.
 
Thanks!
Chip
 
P.S. This problem appears to be similar to the one described here: http://stackoverflow.com/questions/11666907/p2-self-provisioning-rcp-vs-windows-uac