Unable to extract a TAR file that contains sparse entries
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Key: COMPRESS-124
URL: https://issues.apache.org/jira/browse/COMPRESS-124
Project: Commons Compress
Issue Type: New Feature
Components: Archivers
Affects Versions: 1.1, 1.2
Environment: Platform independent. However, I'm currently using Window
7 Enterprise.
Reporter: Patrick Dreyer
Fix For: 1.2
Good news first: I already have the patch ready for that.
I got several TAR files which I could not extract with any of the existing Java
implementations, but I could extract all those TAR files successfully with GNU
tar.
It turned out that all the failing TAR files contained so called sparse files.
Investigating the source code of all existing Java TAR implementations showed
me that none of them even recognizes the existence of GNU sparse entries.
Actually, I don't need to process one of the contained sparse files and I'm
happy if I'm at least able to correctly untar all the non-sparsed files. Thus,
it would be sufficient recognizing sparse files without the need to correctly
un-sparse them while extracting. As long as all non-sparsed files get extracted
correctly, I'm fine.
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