Re: [p2-dev] Fragment oddities

[Pascal Rapicault <Pascal_Rapicault@xxxxxxxxxx>]

As Ian mention this is not an odity, this is by design. I just want to add some more details to Ian's answer.
The relationship between a bundle and a bundle fragment does not need to be modelled in a special way from a provisioning standpoint, it is just a dependency.
You have to remember that p2 is to provision everything and nothign in particular, exposing the concept of osgi fragment as a special entity in the metadata would fail this attempt of being generic.
IUFragments are mostly used to deliver configuration information such as startlevels, vm args, etc which can not be placed in the IU they are attaching to since it would make the IU not reusable (e.g. the start level of the extension registry depends on the environment in which it is deployed).

PaScaL


Ian Bull ---09/23/2009 06:21:39 PM--->From what I understand (this was explained to me a while back), fragments in the sense of OSGi and Fragments in the sense of p

From:	Ian Bull <irbull@xxxxxxxxxxxxxxxxx>
To:	P2 developer discussions <p2-dev@xxxxxxxxxxx>
Date:	09/23/2009 06:21 PM
Subject:	Re: [p2-dev] Fragment oddities

---

>From what I understand (this was explained to me a while back), fragments in the sense of OSGi and Fragments in the sense of p2 are two completely different things.  The p2 metadata doesn't represent OSGi fragments as InstallableUnitFragments, these are represented as normal InstallableUnits.

IUFragments are used to declare fragments on the IU (translation properties on the IU for example).

I'm not sure if that made sense. ;)

cheers,
ian

On Wed, Sep 23, 2009 at 3:10 PM, Thomas Hallgren <thomas@xxxxxxx> wrote:

I'm looking at an IU that I was fairly sure was a fragment. The IU in question is the 'org.eclipse.swt.win32.win32.x86'.

When I read this IU using a query, it doesn't arrive as a IInstallableUnitFragment and when I look at it's XML in the content.jar, it doesn't have any hostRequirements. It's also missing the fragment signum:

<property name='org.eclipse.equinox.p2.type.fragment' value='true'/>

So I guess this isn't a fragment then, at least not from a P2 perspective? OSGi will see it as a fragment. The manifest contains:

 Fragment-Host: org.eclipse.swt;

and this entry can also be found. Not sure what it means, but perhaps it's some ancient way of declaring the host requirement?

<provided namespace='osgi.fragment' name='org.eclipse.swt' version='3.5.0.v3550b'/>

Can someone please explain why the IU is declared this way?

Thanks,
Thomas Hallgren

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