[MDEP-651] - allow unpack dependency to configure entries overwrite

[viqueen]

https://issues.apache.org/jira/browse/MDEP-651

Extending unpack-dependencies with an option to not overwrite archive entries with duplicate names. The latter can be problematic on case insensitive file systems.

From what I can tell, we always overwrite when unarchiving artifacts , therefore maintaining that to be the default behaviour.

This change will also require the following updates to plexus-archiver https://github.com/codehaus-plexus/plexus-archiver/pull/112

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[khmarbaise]

It would be great having a unit/integration tests to check the behaviour...

[hazendaz]

need this one badly. Recent plexus archivers fail hard so we have to use 4.2.2 so that it does not. even without tests its a problem currently if overwrite as documented all over doesn't actually work. what can we do to get this going?

[hazendaz]

see https://maven.apache.org/plugins/maven-dependency-plugin/usage.html, the documentation as is states this works, this shows that it does not, proven does not.

plexus archiver 4.2.2 simply states [WARNING] Unable to expand to file .... when it has issue. All newer including 4.7.1 of plexus archiver blow up as file is open (ie windows).

[hazendaz]

ok guess this may be different issue. and much worse. 'unpack' isn't respecting this. 'unpack-dependencies' didn't have it. willing to fix here but I doubt this even works. Its simply to test. I unzip chrome to .m2 and then open a copy, crashes everytime as indicated with newer plexus archiver but was a warning previously but really don't want it to re-extract anything.