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https://issues.apache.org/jira/browse/HADOOP-8847?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13463638#comment-13463638
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Steve Loughran commented on HADOOP-8847:
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Bikas, you know that the java untar doesn't set FS permissions? Even if that's
considered unimportant, the big worry I have is over long filenames.
The Ant tar/untar logic doesn't do perms either, but does handle gnu & posix
extensions:
[ http://svn.apache.org/viewvc/ant/core/trunk/src/main/org/apache/tools/tar/ ]
you can pick this up via Apache Compress: [ http://commons.apache.org/compress/
] -I'm not sure that version is up to date w/ Posix patches.
You need tests to verify that
# filenames > 140 chars can be untarred (tar --format=gnu )
# LFNs in old gnu format are handled (tar --format=oldgnu)
# long filenames in a tar created w/ posix (tar --format=posix)
These files could all be created on a Linux box and added to svn, so that the
tests on windows will be consistent.
Without tests showing that long filenames are handled, switching to a pure Java
API will not be backwards compatible and runs a risk of things breaking. Sun's
implementation cannot handle such files.
> Change untar to use Java API instead of spawning tar process
> ------------------------------------------------------------
>
> Key: HADOOP-8847
> URL: https://issues.apache.org/jira/browse/HADOOP-8847
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Bikas Saha
> Assignee: Bikas Saha
> Attachments: HADOOP-8847.branch-1-win.1.patch, test-untar.tar,
> test-untar.tgz
>
>
> Currently FileUtil.unTar() spawns tar utility to do the work. Tar may not be
> present on all platforms by default eg. Windows. So changing this to use JAVA
> API's would help make it more cross-platform. FileUtil.unZip() uses the same
> approach.
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