Date: Wed, 17 Nov 2004 16:51:01 +0000 From: Andrew Sinclair <syncman@optusnet.com.au> To: Kris Kennaway <kris@obsecurity.org>, questions@freebsd.org Subject: Re: 5.3-RC2 tar breaks operation with "(null)" Message-ID: <419B8175.6060506@optusnet.com.au> In-Reply-To: <20041116213536.GG17125@xor.obsecurity.org> References: <419A5AAB.7080409@optusnet.com.au> <20041116213536.GG17125@xor.obsecurity.org>
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Kris Kennaway wrote:
>On Tue, Nov 16, 2004 at 07:53:15PM +0000, Andrew Sinclair wrote:
>
>
>>Hi everybodi!
>>
>> At work I use a Windows eXPensive machine...
>> I burned this tar dump onto a CD-RW...
>> I'm using the new tar from 5.3-RC2 to read from the mounted CD-RW...
>>It seems to have a problem with null blocks...
>>
>>bash-2.05b$ tar -xvf /dvdrom/20041116.tgz
>>...
>>x Ocean Care Day/OCD website/Website/OCD Photos/Presentation.ppt: (null)
>>tar: (null)
>>bash-2.05b$
>>
>> I remembered that tar uses four blocks of 0x00 to indicate the end
>>of an archive on a sequential device...
>>
>> I might be able to get around it with another tar but...
>>
>>
>
>Try an updated version of bsdtar, either by updating to 5.3-STABLE or
>installing the bsdtar port. Alternatively, use gtar.
>
>Kris
>
>
<>I checked the changelog for that. There is a minor change to its
handling of failed writes to the archive, which is quite the opposite of
what I am trying to do. My disc is unsuprisingly screwed and the
drive/filesystem returns zero filled blocks where it fails to read. I
managed to work around it with dd and gtar:
dd if=/dvdrom/20041116.tgz of=/home/shared/mec/20041116.tgz
gtar --ignore-zero --ignore-failed-read -xvf
/home/shared/mec/20041116.tgz
So a PPT and a PNG were garbled. No big deal. Since bsdtar is now the
default Tape ARchiver, shouldn't it include the options of its
predecessor? I would assert --ignore-zero on plain files and allow
--ignore-failed-read at least.
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