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To: Matt Dillon <dillon@earth.backplane.com>
Subject: Re: RE: Proposed makewhatis perl script fix
Message-ID: <981905794.3a86b1830102a@webmail.harmonic.co.il>
Date: Sun, 11 Feb 2001 17:36:35 +0200 (IST)
From: Roman Shterenzon <roman@harmonic.co.il>
Cc: freebsd-stable@FreeBSD.ORG
References: <Pine.BSF.4.32.0102110834080.13021-100000@titanic.medinet.si> <200102110819.f1B8Jk430590@earth.backplane.com>
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Quoting Matt Dillon <dillon@earth.backplane.com>:

> :> :of what is broken.
> :> :
> :> :Kent
> :>
> :>     makewhatis is just makewhatis... it has nothing to do with tar.
> :>
> :>     When you tar something up, tar writes full blocks.  But when you
> untar
> :>     something the actual end of the archive may occur in the middle
> of a
> :>     block.  tar will close the input descriptor 'early' in this case,
> :>     potentially before gunzip or uncompress manage to write the last
> block
> :>     of zeros.
> :
> :I also don't believe that this is the real fix - there is something
> fishy
> :going on in stable. I just upgraded all of our servers from 4.2-RELEASE
> to
> :4.2-STABLE and I see the following messages upon installing *any*
> package:
> :
> :/home/blaz# pkg_add gmake-3.79.1.tgz
> :
> :gzip: stdout: Broken pipe
> :tar: child returned status 1
> :/home/blaz#
> :
> :The package actually appears to install and work fine. I also noticed
> similar
> :messages from gzip during "make" on a port, but again the port built
> and
> :installed fine after that.
> :
> :So no, your makewhatis patch only appears to be a bandaid, but there is
> :something going on deeper (possibly in the kernel) that was not there
> in
> :4.2-RELEASE.
> :
> :Blaz Zupan,  Medinet d.o.o, Linhartova 21, 2000 Maribor, Slovenia
> :E-mail: blaz@amis.net, Tel: +386-2-320-6320, Fax: +386-2-320-6325
> 
>     There's nothing wrong with the kernel.  It's exactly what I said it
>     was.
> 
>     pkg_add runs tar with the --fast-read option to extract the table of
>     contents.  When I remove the option pkg_add no longer reports broken
>     pipes.  When gunzip'ing piped to tar, and tar exits early due to
>     the option, gunzip properly gets a 'gzip: stdout: Broken pipe'
> error.
> 
>     Maybe 'tar' was changed recently, maybe 'gunzip' was changed
> recently,
>     I don't know.  But it isn't a kernel problem.  The kernel is doing 
>     exactly what it is supposed to be doing.
> 
I'm not sure, but there were rumors floating around that its due to some bug
in the new OpenSSH. Can you confirm it?

--Roman Shterenzon, UNIX System Administrator and Consultant
[ Xpert UNIX Systems Ltd., Herzlia, Israel. Tel: +972-9-9522361 ]


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