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RE: [p2-dev] plugins folder provisioning

Got it.  Many thanks Simon.
 
Points noted about dropins & back compat.
 
One interesting use case that I think will need supporting going forwards (at least medium term) is how all this meshes together with servlet bridge type implementations.
 
Whilst I definitely agree that a servlet bridge osgi instance can be managed via the director app or some web-based version of eclipse's software updates whilst in production.  Developer use cases may, I think, be slightly different.  They would seem to be more focussed on a changing system manifest over time rather than on any onward provisioning the user or an administrator might do.   A developer developing within the context of a servlet bridge (i.e. a webapp) will need some sort of workspace (dropins?) where he can develop his bundles and he will expect to be able to drop new bundles into "plugins" as dependencies from his bundles are discovered and added during the course of his development. 
 
At least that is the medium term use case that I see.  Not sure how this will play out longer term as osgi matures as a server-side technology, possibly as a first class citizen.
 
Those are some thoughts anyway.  Would love to hear others.
 
Once again many thanks for the quick response Simon
Cheers,
_Paul
 

From: p2-dev-bounces@xxxxxxxxxxx [mailto:p2-dev-bounces@xxxxxxxxxxx] On Behalf Of Simon Kaegi
Sent: 16 January 2009 17:44
To: P2 developer discussions
Subject: RE: [p2-dev] plugins folder provisioning

Yes that's right. The same mechanism is also used for .link files and cases where someone is messing with platform.xml.
One thing to keep in mind is that the dropins support is there primarily to ensure we have a backwards compatibility story. As an install gets more complex you really should use the "director" (either in-process with the UI or out of process with the director app).
>From what I've seen, without it your install is going to be increasingly brittle in the face of anything else getting installed.
-Simon

Inactive hide details for Warren_Paul---01/16/2009 11:47:52 AM---Hi Simon,Warren_Paul---01/16/2009 11:47:52 AM---Hi Simon,


From:

Warren_Paul@xxxxxxx

To:

<p2-dev@xxxxxxxxxxx>

Date:

01/16/2009 11:47 AM

Subject:

RE: [p2-dev] plugins folder provisioning




Hi Simon,

Sure.

So reconciler.dropins handles "plugins" folder provisioning as well as "dropins" folder?

_Paul


From: p2-dev-bounces@xxxxxxxxxxx [mailto:p2-dev-bounces@xxxxxxxxxxx] On Behalf Of Simon Kaegi
Sent:
16 January 2009 16:43
To:
P2 developer discussions
Subject:
Re: [p2-dev] plugins folder provisioning

The bundle is org.eclipse.equinox.p2.reconciler.dropins.

In a nutshell what it does is try to install everything it finds "OPTIONALLY".
What that means is that if anything else is already installed that conflicts with the new thing the "optional" bundle/feature will not get installed.
What this amounts to is that In many cases the "version increment" use-case will fail without a matching feature patch. This is because the feature will typically reference an exact version of a bundle and without the patch the net result would be an invalid install.
-Simon.


Inactive hide details for Warren_Paul---01/16/2009 11:04:10 AM---Hi Folks,Warren_Paul---01/16/2009 11:04:10 AM---Hi Folks,


From:

Warren_Paul@xxxxxxx

To:

<p2-dev@xxxxxxxxxxx>

Date:

01/16/2009 11:04 AM

Subject:

[p2-dev] plugins folder provisioning




Hi Folks,


As per this paragraph on the getting started wiki page:-


"
The new dropins folder is where you can drop in extra plug-ins if you don't want to use the p2 user interface. See the dropins section for more details. For backwards compatibility, p2 will also detect extra plug-ins dropped into the plugins directory, and install any discovered bundles into the system."

it seems eclipse will still pick up new plugins dropped into the plugins folder. I'd like to understand the extent of this implementation - for example will it also detect version increments from "plugins"?


Can someone point me at the bundle that is responsible for handling provisioning of the "plugins" folder?


Many thanks
_Paul
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