Assaf Gordon <assafgordon@HIDDEN>
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Date: Tue, 06 Sep 2011 10:04:25 +0100
From: =?ISO-8859-1?Q?P=E1draig_Brady?= <P@HIDDEN>
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To: Jim Meyering <jim@HIDDEN>
Subject: Re: bug#9446: Bug in cp (or strange behaviour and unclear
documentation)
References: <86zkiirdt0.fsf@HIDDEN> <877h5m4094.fsf@HIDDEN>
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Cc: 9446 <at> debbugs.gnu.org, Torbjorn Granlund <tg@HIDDEN>
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On 09/06/2011 08:07 AM, Jim Meyering wrote:
> Torbjorn Granlund wrote:
>> On FreeBSD (tested on 8.1, but exact version is unlikely relevant)
>> copying a file from a ZFS file system to a tmpfs or tmpmfs filesystem,
>> the -p option causes cp to return with a non-zero exit status.
>>
>> Sample run:
>>
>> $ cp -p /etc/profile /tmp/foo || echo non-zero exit
>> cp: preserving permissions for `/tmp/foo': Invalid argument
>> non-zero exit
>>
>> Some debugging shows that the function acl_access_nontrivial returns 1,
>> caused by the tag ACL_EVERYONE. (It is present in every file by
>> default.)
>>
>> ACLs are not supported on FreeBSD's tmpfs or tmpmfs file system types.
>>
>> Perhaps this failure is intentional? Then it should be clearly
>> documented for the -p/--preserve option. I have read it carefully, and
>> I cannot see support for the observed behaviour.
>>
>> Consider what happens under -p when copying a file owned by somebody
>> else. The used and group owners can then not (typically) be preserved.
>> This is not considered an error in cp.
>>
>> Similarly, when copying a file with the setuid bit set, and the user is
>> changed (per above) the setuid bit is not preserved, and this is also
>> not considered an error by cp.
>>
>> The failure to preserve (partial) ACL data should IMHO not be considered
>> an error, except perhaps under some --preserve=blah options, where blah
>> denoted preservation of exactly this.
>
> Hi!
> Long time ;-)
>
> ACL-preservation has always been lumped in with the
> permission-preservation that you get with cp's "-p".
> However, that is not POSIX-mandated.
>
> This is the responsible code in copy.c:
>
> if (x->preserve_mode || x->move_mode)
> {
> if (copy_acl (src_name, -1, dst_name, -1, src_mode) != 0
> && x->require_preserve)
> return false;
> }
>
> However, upon copy_acl failure, rather than simply returning false, it
> might be ok to return true for EINVAL, or even to perform a relatively
> expensive test (the first time for each FS) to see if the failure is
> due to lack of ACL support in the destination file system.
>
> I'm less inclined to add a separate --preserve=acl option, because
> that would involve a behavior change (of not copying ACLs by default).
I agree. It's like ACLs span both --preserve=mode and --preserve=xattrs (if possible).
The trivial ACLs are already made optional within copy_acl()
assuming I suppose that the dest will record this info anyway.
So what to do if other ACLs can't be preserved.
Ideally I think we'd like to:
1. Warn once per cp invocation about unpreserved non trivial ACLs
2. With --verbose, warn per file, which ACLs were not preserved.
3. if !ACL_NOT_WELL_SUPPORTED(errno) exit 1
As an interim measure we could just do 3, which would give
many non specific "preserving permissions" errors,
but at least exit appropriately.
cheers,
Pádraig.
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#9446; Package coreutils.
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From: Jim Meyering <jim@HIDDEN>
To: Torbjorn Granlund <tg@HIDDEN>
Subject: Re: bug#9446: Bug in cp (or strange behaviour and unclear
documentation)
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Torbjorn Granlund wrote:
> On FreeBSD (tested on 8.1, but exact version is unlikely relevant)
> copying a file from a ZFS file system to a tmpfs or tmpmfs filesystem,
> the -p option causes cp to return with a non-zero exit status.
>
> Sample run:
>
> $ cp -p /etc/profile /tmp/foo || echo non-zero exit
> cp: preserving permissions for `/tmp/foo': Invalid argument
> non-zero exit
>
> Some debugging shows that the function acl_access_nontrivial returns 1,
> caused by the tag ACL_EVERYONE. (It is present in every file by
> default.)
>
> ACLs are not supported on FreeBSD's tmpfs or tmpmfs file system types.
>
> Perhaps this failure is intentional? Then it should be clearly
> documented for the -p/--preserve option. I have read it carefully, and
> I cannot see support for the observed behaviour.
>
> Consider what happens under -p when copying a file owned by somebody
> else. The used and group owners can then not (typically) be preserved.
> This is not considered an error in cp.
>
> Similarly, when copying a file with the setuid bit set, and the user is
> changed (per above) the setuid bit is not preserved, and this is also
> not considered an error by cp.
>
> The failure to preserve (partial) ACL data should IMHO not be considered
> an error, except perhaps under some --preserve=blah options, where blah
> denoted preservation of exactly this.
Hi!
Long time ;-)
ACL-preservation has always been lumped in with the
permission-preservation that you get with cp's "-p".
However, that is not POSIX-mandated.
This is the responsible code in copy.c:
if (x->preserve_mode || x->move_mode)
{
if (copy_acl (src_name, -1, dst_name, -1, src_mode) != 0
&& x->require_preserve)
return false;
}
However, upon copy_acl failure, rather than simply returning false, it
might be ok to return true for EINVAL, or even to perform a relatively
expensive test (the first time for each FS) to see if the failure is
due to lack of ACL support in the destination file system.
I'm less inclined to add a separate --preserve=acl option, because
that would involve a behavior change (of not copying ACLs by default).
owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#9446; Package coreutils.
Full text available.Received: (at submit) by debbugs.gnu.org; 5 Sep 2011 23:02:57 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Sep 05 19:02:57 2011 Received: from localhost ([127.0.0.1] helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1R0iBs-0005v6-Ep for submit <at> debbugs.gnu.org; Mon, 05 Sep 2011 19:02:57 -0400 Received: from eggs.gnu.org ([140.186.70.92]) by debbugs.gnu.org with esmtp (Exim 4.69) (envelope-from <tg@HIDDEN>) id 1R0es0-00086x-0B for submit <at> debbugs.gnu.org; Mon, 05 Sep 2011 15:30:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <tg@HIDDEN>) id 1R0eoK-0003NA-HA for submit <at> debbugs.gnu.org; Mon, 05 Sep 2011 15:26:28 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=unavailable version=3.3.1 Received: from lists.gnu.org ([140.186.70.17]:59905) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <tg@HIDDEN>) id 1R0eoK-0003N6-Fk for submit <at> debbugs.gnu.org; Mon, 05 Sep 2011 15:26:24 -0400 Received: from eggs.gnu.org ([140.186.70.92]:55883) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <tg@HIDDEN>) id 1R0eoJ-0002OZ-Fu for bug-coreutils@HIDDEN; Mon, 05 Sep 2011 15:26:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <tg@HIDDEN>) id 1R0eoI-0003Ml-J2 for bug-coreutils@HIDDEN; Mon, 05 Sep 2011 15:26:23 -0400 Received: from gmplib-02.nada.kth.se ([130.237.222.242]:30681 helo=shell.gmplib.org) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <tg@HIDDEN>) id 1R0eoI-0003MW-EA for bug-coreutils@HIDDEN; Mon, 05 Sep 2011 15:26:22 -0400 Received: by shell.gmplib.org (Postfix, from userid 1001) id 9A4357703; Mon, 5 Sep 2011 21:26:19 +0200 (CEST) To: bug-coreutils@HIDDEN Subject: Bug in cp (or strange behaviour and unclear documentation) From: Torbjorn Granlund <tg@HIDDEN> Date: Mon, 05 Sep 2011 21:26:19 +0200 Message-ID: <86zkiirdt0.fsf@HIDDEN> User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6 (newer, 3) X-Received-From: 140.186.70.17 X-Spam-Score: -6.6 (------) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Mon, 05 Sep 2011 19:02:55 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Sender: debbugs-submit-bounces <at> debbugs.gnu.org Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org X-Spam-Score: -6.6 (------) On FreeBSD (tested on 8.1, but exact version is unlikely relevant) copying a file from a ZFS file system to a tmpfs or tmpmfs filesystem, the -p option causes cp to return with a non-zero exit status. Sample run: $ cp -p /etc/profile /tmp/foo || echo non-zero exit cp: preserving permissions for `/tmp/foo': Invalid argument non-zero exit Some debugging shows that the function acl_access_nontrivial returns 1, caused by the tag ACL_EVERYONE. (It is present in every file by default.) ACLs are not supported on FreeBSD's tmpfs or tmpmfs file system types. Perhaps this failure is intentional? Then it should be clearly documented for the -p/--preserve option. I have read it carefully, and I cannot see support for the observed behaviour. Consider what happens under -p when copying a file owned by somebody else. The used and group owners can then not (typically) be preserved. This is not considered an error in cp. Similarly, when copying a file with the setuid bit set, and the user is changed (per above) the setuid bit is not preserved, and this is also not considered an error by cp. The failure to preserve (partial) ACL data should IMHO not be considered an error, except perhaps under some --preserve=3Dblah options, where blah denoted preservation of exactly this. --=20 Torbj=F6rn (Since I am the original author of cp, I suppose I should really fix the problem myself. But I think the ACL stuff was added later, and I am not familiar with it.)
Torbjorn Granlund <tg@HIDDEN>:bug-coreutils@HIDDEN.
Full text available.owner <at> debbugs.gnu.org, bug-coreutils@HIDDEN:bug#9446; Package coreutils.
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