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From "Simon Spero (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COMPRESS-400) It should be possible for users to create and access extra PAX headers to tar archives
Date Fri, 02 Jun 2017 01:14:04 GMT
Simon Spero created COMPRESS-400:
------------------------------------

             Summary: It should be possible for users to create and access extra PAX headers
to tar archives 
                 Key: COMPRESS-400
                 URL: https://issues.apache.org/jira/browse/COMPRESS-400
             Project: Commons Compress
          Issue Type: Improvement
          Components: Archivers
            Reporter: Simon Spero
            Priority: Minor


It is very useful to be able to add extra PAX headers to tar entries.  For example, a tar
file containing maven artifacts could have extra headers carrying the groupid, artifactid,
version, classifier, etc.  

If the appropriate prefixes are used, these headers can be extracted to posix extended attributes
by gnu and bsdtar.

This change requires adding a map to TarArchiveEntry to carry the extra headers, plus modifications
to the TarArchive*Stream to save unrecognized headers when reading, and to add any extra headers
when writing. 

I have created a prototype implementation, but have not merged it into my fork of the project.
 I don't have full tests written, because I was using gnutar as an oracle.
 I have also ignored the issue of writing values to standard headers like size, though since
the PAX specification states that doing things like setting size=100 (if the real size is
not in fact 100) is undefined, so I'm technically in compliance.  The temptation is  to do
what was asked, then on close pop up a "Were you sure?" dialog, but that's mean.  I guess
I could use this to set the appropriate entry fields if doing so makes sense, but the easiest
approach  is to block setting any headers that would be consumed by the tar implementation
when reading. 



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