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Simon Spero commented on COMPRESS-400: -------------------------------------- For 3, it looks TarArchiveInputStream looks like it's already doing the right thing For 2, it looks quite doable. I think that it's necessary to delay writing a global header block until there's a request to write a regular entry, since it seems that you can't follow a global extended header with the end-of-archive record, despite it not being attached to any particular file. > 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. -- This message was sent by Atlassian JIRA (v6.3.15#6346)