RFR: 8311302: Allow for jlinking a custom runtime without packaged modules being present [v6]

[Severin Gehwolf]

On Mon, 13 Nov 2023 15:37:29 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> > A few very minor things that I jotted down while looking at the current proposal:
> > ```
> > * Adding a resource to serve as a marker that indicates it was created without the packaged modules is fine. I think the name should be looked as "runimage" is a bit consistent for this area. I'm also wondering if it would be better to hide in jdk/internal somewhere to avoid any tooling assuming it's a supported interface.
> > ```
> 
> How does `jdk/internal/runimage` as a name sound?

Coming back to this. Since `jlink` [verifies the packages in the module descriptor are equal](https://github.com/openjdk/jdk/blob/a75b6e569fe5f8e98326940f541423ac39b204a3/src/jdk.jlink/share/classes/jdk/tools/jlink/internal/ResourcePoolConfiguration.java#L90-L95) to the observed packages, we cannot add packages that way without also changing the module descriptor. I've renamed the resource file to `jdk_internal_runimage` for now. Hope that's sufficient.

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PR Comment: https://git.openjdk.org/jdk/pull/14787#issuecomment-1810581824