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From "Stefan Bodewig (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COMPRESS-132) Add support for unix dump files
Date Wed, 17 Aug 2011 04:26:27 GMT

    [ https://issues.apache.org/jira/browse/COMPRESS-132?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086124#comment-13086124
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Stefan Bodewig commented on COMPRESS-132:
-----------------------------------------

I've managed to create archives and committed an initial testcase which fails to extract the
files (they are empty), I'll try to investigate whether this is due to changes I have made
or already happens with your code base later.

The other thing that fails is format recognition.  The archives I have created contain the
magic number 60012 at offset 24 (where my magic file expects it to be) but the code in the
matches method is looking at offset 7.  Is the code wrong?

Also, do you think we'd need to also check for little endian order or the old-fs dump (60011)
or does the current code not support those anyway?


> Add support for unix dump files
> -------------------------------
>
>                 Key: COMPRESS-132
>                 URL: https://issues.apache.org/jira/browse/COMPRESS-132
>             Project: Commons Compress
>          Issue Type: New Feature
>          Components: Archivers
>            Reporter: Bear Giles
>            Priority: Minor
>             Fix For: 1.3
>
>         Attachments: dump-20110722.zip, dump.zip, test-z.dump, test.dump
>
>
> I'm submitting a series of patches to the ext2/3/4 dump utility and noticed that the
commons-compress library doesn't have an archiver for it. It's as old as tar and fills a similar
niche but the later has become much more widely used. Dump includes support for sparse files,
extended attributes, mac os finder, SELinux labels (I think), and more. Incremental  dumps
can capture that files have been deleted.
> I should have initial support for a decoder this weekend. I can read the directory entries
and inode information (file permissions, etc.) but need a bit more work on extracting the
content as an InputStream.

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