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From "Patrick Dreyer (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (COMPRESS-124) Unable to extract a TAR file that contains sparse entries
Date Wed, 15 Dec 2010 07:37:00 GMT

    [ https://issues.apache.org/jira/browse/COMPRESS-124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12971567#action_12971567
] 

Patrick Dreyer edited comment on COMPRESS-124 at 12/15/10 2:36 AM:
-------------------------------------------------------------------

Including not only the source but as well the documentation and changes.xml

Unfortunately, I was not able to generate a test TAR archive containing sparse files, even
invoking GNU Tar with "--sparse" and all the TAR archives I have with such sparse files, contain
information I'm not allowed disclose.
If someone is able to generate a TAR archive containing sparse files and provide such, pleas
let me know so I can include the necessary unit tests.

      was (Author: patrickdreyer):
    Including not only the source but as well the documentation and changes.xml
  
> Unable to extract a TAR file that contains sparse entries
> ---------------------------------------------------------
>
>                 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
>
>         Attachments: gnuSparseFile.patch
>
>
> 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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