P2 team,

*Overview*

We have been proposing an additional layer on top of P2 to take care of 80%
of the auto-update use-cases really simply.  The purpose of this message is
to run our proposed API past the community and make sure we're not doing
anything silly or stupid as well as to hopefully elicit constructive
feedback about this proposal.

*Proposal*

1) public InstallStatus install(Set<URL> p2Sites) throws InstallError

The purpose of this API is simply to synchronize the running platform with
the union of the IUs available on p2Sites.  New stuff is installed;
out-of-date IUs are upgraded; IUs that no longer exist on any site are
removed from the local configuration.

The InstallStatus return value is an IStatus.  It (a) tells the client if it
needs to restart, and (b) encapsulates state that you might want to log for
diagnostic purposes.

2) public InstallStatus install(Set<URL> p2Sites, Set<IVersionedId>
featuresRequested) throws InstallError

Sometimes you want to only make a certain set of Features available to the
user, based on their login credentials or if they've given you money, for
example.  This API presumes that you've done whatever you need to determine
what IUs/Features you need, and it installs just those IUs/Features.  All
other Features are disabled in the current profile.

*Conclusion*

Having these two APIs would handle all of the self-updating RCP applications
we have seen at my client and probably most of them out there.  This seems
like a lot of expressive value for RCP (and possibly server-side OSGi)
clients.

Unless someone objects, we would like to go ahead and implement these (and
incubate the work in the E4 repo).

*Questions*

Does anyone see any issues with defining API this way?  For example, is it
okay for P2 to have a dependency on core.runtime (IStatus)?

Any other thoughts/feedback?


Regards,

Dave Orme
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