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From "Stefan Bodewig (JIRA)" <>
Subject [jira] [Commented] (COMPRESS-400) It should be possible for users to create and access extra PAX headers to tar archives
Date Thu, 15 Jun 2017 16:08:00 GMT


Stefan Bodewig commented on COMPRESS-400:

Thanks a lot Simon, the patch looks good.

Do you really think we need the special handling of {{SCHILY.xattr}}? I'd expect people who
want to set those special attributes to know about the prefix and they could use {{get/setExtraPaxHeader}}
themselves. Is setting those attributes such a common case for you (so far nobody has ever
asked for being able to set PAX headers at all, so they don't seem to be used widely)?

> It should be possible for users to create and access extra PAX headers to tar archives

> ---------------------------------------------------------------------------------------
>                 Key: COMPRESS-400
>                 URL:
>             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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