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Date: Wed, 21 Dec 2005 12:46:30 +0000
From: Chris Taylor <chris AT equate DOT dyndns DOT org>
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To: cygwin AT cygwin DOT com
Subject: Re: tar with switches leads to stack dump
References: <000001c60608$8ab30190$500210ac AT tcgp DOT dundee DOT ac DOT uk> <20051221113723 DOT GD28865 AT calimero DOT vinschen DOT de>
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Corinna Vinschen wrote:
> On Dec 21 08:28, fergus wrote:
> 
>>I'm trying to append several new files to an existing zipped .tar.gz and
>>maintain the zipped format. I find that 
>>	tar -vrzf exist.tar.gz *.new
>>leads to an 
>>	Aborted (core dumped)
>>message. More than likely my syntax is faulty, but maybe not. (Creating a
>>.tar.gz from scratch using "tar -vczf .." works fine. Appending new files to
>>an existing .tar using "tar -vrf exist.tar *.new" works fine.) This happens
>>with 1.5.18 and 1.5.19s 20051220. Please can anybody put me right or confirm
>>the core dump? Thank you.
>>Fergus
> 
> 
> Confirmed.  Looks like tar is calling abort() at one point, without
> printing any error message beforehand.
> 
> 
> Corinna
> 

Just an FYI, this fails under linux as well, though doesn't core dump.
At a guess, it's probably because tar isn't intelligent enough to gunzip 
the tarfile before attempting to append (or is specifically set not to - 
which makes sense)..
If you gunzip the file, use tar rvf archive.tar new.files, then gzip it, 
it works fine..
So while the coredump is interesting, this isn't really a variance in 
standard behaviour for tar AFAICS.
Of course, a more informative message than "Aborted" would be nice, but 
hey, we can't have everything ;)


Chris
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