5.3-RC2 tar breaks operation with "(null)"

Kris Kennaway kris at obsecurity.org
Tue Nov 16 13:32:34 PST 2004


On Tue, Nov 16, 2004 at 07:53:15PM +0000, Andrew Sinclair wrote:
> Hi everybodi!
> 
>    At work I use a Windows eXPensive machine to gather information and 
> maintain the web site. I needed to bring some files home and I didn't 
> have time to setup a proper archiver, so I used cygnus tar to pack them 
> uncompressed.
>    I burned this tar dump onto a CD-RW. I didn't just pack everything 
> into Nero and let the Toliet^WJoliet file system take care of it because 
> neither Joliet or Rock Ridge allow files to use the same name even if 
> they are in different paths. Besides, there are file name size 
> limitations... I have not even started yet. don't make me.
>    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, halfway through the archive 
> in my case. I got this in the output:
> 
> bash-2.05b$ tar -xvf /dvdrom/20041116.tgz
> ...
> x Ocean Care Day/OCD website/Website/OCD Photos/mec cam 
> pictures/000_0075.jpg
> x Ocean Care Day/OCD website/Website/OCD Photos/mec cam pictures/Thumbs.db
> 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, such as a tape, so I searched the 
> man page for an option to bypass it. No luck. Of all the problems people 
> have with defacto standard optical media, I had to run into a software 
> issue :-\
> 
>    I might be able to get around it with another tar but surely the one 
> included should be able to work around this. Any ideas?

Try an updated version of bsdtar, either by updating to 5.3-STABLE or
installing the bsdtar port.  Alternatively, use gtar.

Kris
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