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Date:	Tue, 26 Apr 2011 11:43:47 +0800
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Subject:	Re: untarring symlinks with ../ fails randomly
From:	Dima Pasechnik <dimpase AT gmail DOT com>
To:	cygwin AT cygwin DOT com
Cc:	ingber AT alumni DOT caltech DOT edu
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Dear all,

that's roughly what I also sent to the list in reply to Corinna's message,
but it didn't get through (spamfilter? blacklist? - no idea).
I tried sending 4 times, and all these messages went to a black hole...


On 25 April 2011 22:59, Lester Ingber <ingber AT alumni DOT caltech DOT edu> wrote:
> Corinna Vinschen <corinna-cygwin <at> cygwin.com> writes:
>
>>
>> On Apr 24 17:14, Dima Pasechnik wrote:
>> > Dear all,
>> > reposting, as the message did not get through to the mailing list yest=
erday:
>> >
>> > The issue I have is exactly as described in
>> > http://sourceware.org/ml/cygwin/2011-04/msg00299.html
>> > I can reproduce this on a very similar Windows 7 host.
>> > (To be precise, it seems hard to predict when creating symlinks fails;
>> > I could say
>> > that perhaps 20% of them, on average, are not created correctly (i.e.
>> > I get files of size 0 instead)).
>>
>> A simple testcase in plain C to reproduce the issue would be fine.
>> Did you try to create the symlinks under strace? =C2=A0It should contain
>> some valuable hint from the function "symlink_worker".
>>
>> Corinna
>>
>
> The problem seems to be with untar, not tar per se. =C2=A0Just today, I d=
id `tar cp`
> a directory of a few hundred links under Cygwin. =C2=A0Under an unbuntu m=
achine I
> recovered all files and links just fine. =C2=A0Under Cygwin, all files we=
re 0 and
> permissions were "----------" instead of "lrwxrwxrwx" as in the original
> directory. =C2=A0(Yesterday, half the links were 0. =C2=A0After compiling=
 tar-12.6 from
> gnu.org I still got 8 0's. =C2=A0I then moved that tar to tar-1.26 yester=
day.) =C2=A0I
> include an excerpt of the log of `tar xfp` doing this with strace just fo=
r one
> file, index.html.
>

[...]

Dmitrii

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