jruby.home extraction / jar-complete / content mismatch
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                 Key: JRUBY-1476
                 URL: http://jira.codehaus.org/browse/JRUBY-1476
             Project: JRuby
          Issue Type: Improvement
          Components: Miscellaneous
    Affects Versions: JRuby 1.1.0, JRuby 1.x
         Environment: any
            Reporter: skaar
            Assignee: Thomas E Enebo
            Priority: Minor


When data is extracted from jruby-complete.jar for example into jruby-home, you 
will end up with a mismatch between the version of files
expected by JRuby in the jar file and what is extracted. It is currently not 
possible to re-extract, without deleting the previously extracted tree and
there is currently no way to determine if the extracted data is the same.

A couple of possibilities and things to consider:
- add a checksum of one or more files to keep track of this
- add a way to re-extract based on this checksum
- blind re-extract could leave 'stale' data
- the user might want to re-extract only 'core' data, and leave things like 
non-default gems in place

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