[MJMOD-27] Implement unpack goal

[jira-importer]

Alexander Kriegisch opened MJMOD-27 and commented

There has not been another alpha release for 2.5 years (2017/09 to 2020/05), so I am not sure if this project is dead or alive. But in case development is still active, I would like to have an option to not only to create a JMOD but also to unpack one. Maybe this could also be implemented in Maven Assembly. I am not sure where it would fit best, but I think here.

Background:

• Sometimes I want to instrument JRE/JDK classes using ASM, ByteBuddy, Javassist or similar byte code engineering tools during build time in order to then either prepend the resulting JAR file to the boot classpath (Java <= 8) or to use --patch-module (Java >= 9).
• In order to do that in Java 9+ environments, I have to use JDK command line tools like jmod.exe (unpack single JMOD from jmods directory) or jimage.exe (unpack lib/modules).
• The result is a partly scripted build, using a Beanshell script via Build Helper or something like Antrun.

The benefit of having an unpack feature accessible via a Maven plugin is obvious, I think. Who likes scripted builds?

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Affects: 3.0.0-alpha-1