RFR: 8311302: Allow for jlinking a custom runtime without packaged modules being present [v12]

[Severin Gehwolf]

On Mon, 11 Dec 2023 09:56:49 GMT, Severin Gehwolf <sgehwolf at openjdk.org> wrote:

> > Blowing away the generated image and retrying with --verbose tripped this assert
> > ```
> > java.lang.AssertionError: handling of scratch options failed
> > 	at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.logPackagedModuleEquivalent(JlinkTask.java:675)
> > 	at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImageProvider(JlinkTask.java:581)
> > 	at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.createImage(JlinkTask.java:430)
> > 	at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.run(JlinkTask.java:302)
> > 	at jdk.jlink/jdk.tools.jlink.internal.Main.run(Main.java:56)
> > 	at jdk.jlink/jdk.tools.jlink.internal.Main.main(Main.java:34)
> > Caused by: jdk.tools.jlink.internal.TaskHelper$BadArgs: (...my-original-jdk-directory..)/build/linux-x64/images/jdk/jmods already exists
> > 	at jdk.jlink/jdk.tools.jlink.internal.TaskHelper.newBadArgs(TaskHelper.java:730)
> > 	at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.lambda$static$12(JlinkTask.java:183)
> > 	at jdk.jlink/jdk.tools.jlink.internal.TaskHelper$Option.process(TaskHelper.java:177)
> > 	at jdk.jlink/jdk.tools.jlink.internal.TaskHelper$OptionsHelper.handleOptions(TaskHelper.java:600)
> > 	at jdk.jlink/jdk.tools.jlink.internal.JlinkTask.logPackagedModuleEquivalent(JlinkTask.java:672)
> > 	... 5 more
> > ```
> 
> Could you please provide steps to reproduce this?

NVM. Reproduced it.

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PR Comment: https://git.openjdk.org/jdk/pull/14787#issuecomment-1850253784