From owner-cvs-all@FreeBSD.ORG  Wed Mar  7 06:15:13 2007
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Date: Wed, 7 Mar 2007 17:15:08 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Tim Kientzle <kientzle@FreeBSD.org>
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	<45EDA7E2.4040300@freebsd.org> <20070306204307.GD43608@rambler-co.ru>
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Cc: Greg 'groggy' Lehey <grog@FreeBSD.org>, cvs-src@FreeBSD.org,
	src-committers@FreeBSD.org, Ruslan Ermilov <ru@FreeBSD.org>,
	cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/usr.sbin/pkg_install/lib url.c
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On Tue, 6 Mar 2007, Tim Kientzle wrote:

>>>>> ... GNU tar(1) implied the
>>>>> -p option for root, but BSD tar(1) doesn't do that.
>>>> 
>>>> Hmmm...  This might actually be considered a bsdtar bug.
>>>> I'll look into it.
>>> 
>>> That behavior of BSD tar(1) surprised me, to be honest.
>
> It's a trivial fix; there's already a check for whether
> tar is being run by root.  If so, it sets _EXTRACT_OWNER
> to restore the owner.  I just need to fill in the flags
> associated with -p as well.
>
> One problem that I don't see documented in any GNU tar
> docs I can find:  Is there a way to suppress this behavior
> for root in GNU tar?

>From tar.info:

%%%
`--no-same-owner'
      Do not attempt to restore ownership when extracting.  This is the
      default behavior for ordinary users, so this option has an effect
      only for the superuser.
%%%

Bruce