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Subject: bug#25814: Windows same_file macro is not reliable
Resent-From: Kees Dekker <Kees.Dekker@HIDDEN>
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From: Kees Dekker <Kees.Dekker@HIDDEN>
Thread-Topic: Windows same_file macro is not reliable
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Date: Mon, 20 Feb 2017 16:01:09 +0000
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Hi,

On file systems that do not support inodes (e.g. NTFS, because not everythi=
ng is POSIX), the same_file() macro (in system.h) is incorrect as st_ino (a=
nd probably st_dev) are meaningless. See also https://msdn.microsoft.com/en=
- us/library/14h5k7ff.aspx<https://msdn.microsoft.com/en-%20us/library/14h5=
k7ff.aspx>. I would suggest to add an #ifdef _WIN32 macro that let return s=
ame_file() 0.

The same applies to same_file_attributes macro. The st_uid and st_gid field=
s are never set to a useful value on Windows (see MSDN URL as mentioned bef=
ore).

The resulting suggested code would be:

#if _WIN32
# define same_file(s, t) 0
#else
# define same_file(s, t) \
    ((((s)->st_ino =3D=3D (t)->st_ino) && ((s)->st_dev =3D=3D (t)->st_dev))=
 \
     || same_special_file (s, t))
#endif

and

#ifndef same_file_attributes
#if _WIN32
# define same_file_attributes(s, t) 0
#else
# define same_file_attributes(s, t) \
   ((s)->st_mode =3D=3D (t)->st_mode \
    && (s)->st_nlink =3D=3D (t)->st_nlink \
    && (s)->st_uid =3D=3D (t)->st_uid \
    && (s)->st_gid =3D=3D (t)->st_gid \
    && (s)->st_size =3D=3D (t)->st_size \
    && (s)->st_mtime =3D=3D (t)->st_mtime \
    && (s)->st_ctime =3D=3D (t)->st_ctime)
#endif
#endif

Since I'm unfamiliar with git, please check whether this change is feasible=
.

Regards,
Kees

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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">On file systems that do not support inodes (e.g. NTF=
S, because not everything is POSIX), the same_file() macro (in system.h) is=
 incorrect as st_ino (and probably st_dev) are meaningless. See also
<a href=3D"https://msdn.microsoft.com/en-%20us/library/14h5k7ff.aspx">https=
://msdn.microsoft.com/en- us/library/14h5k7ff.aspx</a>. I would suggest to =
add an #ifdef _WIN32 macro that let return same_file() 0.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The same applies to same_file_attributes macro. The =
st_uid and st_gid fields are never set to a useful value on Windows (see MS=
DN URL as mentioned before).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The resulting suggested code would be:<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">#if _WIN32<o:p></o:p></p>
<p class=3D"MsoNormal"># define same_file(s, t) 0<o:p></o:p></p>
<p class=3D"MsoNormal">#else<o:p></o:p></p>
<p class=3D"MsoNormal"># define same_file(s, t) \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; ((((s)-&gt;st_ino =3D=3D (t)-&gt;=
st_ino) &amp;&amp; ((s)-&gt;st_dev =3D=3D (t)-&gt;st_dev)) \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp;&nbsp; || same_special_file (s, t)=
)<o:p></o:p></p>
<p class=3D"MsoNormal">#endif<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">and<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">#ifndef same_file_attributes<o:p></o:p></p>
<p class=3D"MsoNormal">#if _WIN32<o:p></o:p></p>
<p class=3D"MsoNormal"># define same_file_attributes(s, t) 0<o:p></o:p></p>
<p class=3D"MsoNormal">#else<o:p></o:p></p>
<p class=3D"MsoNormal"># define same_file_attributes(s, t) \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; ((s)-&gt;st_mode =3D=3D (t)-&gt;st_mode=
 \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &amp;&amp; (s)-&gt;st_nlink =3D=
=3D (t)-&gt;st_nlink \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &amp;&amp; (s)-&gt;st_uid =3D=3D =
(t)-&gt;st_uid \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &amp;&amp; (s)-&gt;st_gid =3D=3D =
(t)-&gt;st_gid \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &amp;&amp; (s)-&gt;st_size =3D=3D=
 (t)-&gt;st_size \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &amp;&amp; (s)-&gt;st_mtime =3D=
=3D (t)-&gt;st_mtime \<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp;&nbsp; &amp;&amp; (s)-&gt;st_ctime =3D=
=3D (t)-&gt;st_ctime)<o:p></o:p></p>
<p class=3D"MsoNormal">#endif<o:p></o:p></p>
<p class=3D"MsoNormal">#endif<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Since I&#8217;m unfamiliar with git, please check wh=
ether this change is feasible.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Kees<o:p></o:p></p>
</div>
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Kees Dekker <Kees.Dekker@HIDDEN>
Subject: bug#25814: Acknowledgement (Windows same_file macro is not reliable)
Message-ID: <handler.25814.B.148760649920922.ack <at> debbugs.gnu.org>
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X-Gnu-PR-Message: ack 25814
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Message sent to bug-diffutils@HIDDEN:

Subject: bug#25814: [bug-diffutils] bug#25814: Windows same_file macro is not reliable
Resent-From: Eric Blake <eblake@HIDDEN>
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From: Eric Blake <eblake@HIDDEN>
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From: Eric Blake <eblake@HIDDEN>
To: Kees Dekker <Kees.Dekker@HIDDEN>, 25814 <at> debbugs.gnu.org
Message-ID: <d9291b09-3fee-5223-57aa-742b60df3faa@HIDDEN>
Subject: Re: [bug-diffutils] bug#25814: Windows same_file macro is not
 reliable
References: <858F859BB4F2824EBAB5D4ED58214CB7016A4559B1@HIDDEN>
In-Reply-To: <858F859BB4F2824EBAB5D4ED58214CB7016A4559B1@HIDDEN>

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On 02/20/2017 10:01 AM, Kees Dekker wrote:
> Hi,
>=20
> On file systems that do not support inodes (e.g. NTFS,

NTFS supports inodes; Cygwin uses them.  Just because Window's native
stat() is broken does not mean NTFS is broken.

> because not everything is POSIX), the same_file() macro (in system.h) i=
s incorrect as st_ino (and probably st_dev) are meaningless.

Rather, instead of ignoring inode, it would be nicer (but indeed a more
complex task) to have gnulib work around window's broken stat() to
provide a version that works instead.  It only matters for file systems
that support hard links (like NTFS); on file systems like FAT that lack
hard links, hard-coding that inodes don't work is okay, but on NTFS
where hard-links are supported, treating same_file() as always returning
0 gives wrong results.

At any rate, this is an issue that needs to be resolved in gnulib, as
more than just diffutils is affected by it.

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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Subject: bug#25814: [bug-diffutils] bug#25814: Windows same_file macro is not reliable
Resent-From: Kees Dekker <Kees.Dekker@HIDDEN>
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From: Kees Dekker <Kees.Dekker@HIDDEN>
Thread-Topic: [bug-diffutils] bug#25814: Windows same_file macro is not
 reliable
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Subject: Re: [bug-diffutils] bug#25814: Windows same_file macro is not
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On 02/21/2017 03:21 AM, Kees Dekker wrote:
>> NTFS supports inodes; Cygwin uses them.  Just because Window's native
>> stat() is broken does not mean NTFS is broken.
>=20
> NTFS is not broken, but according to MSDN, it does not support inodes. =
The fact that Cygwin supports is, is more how Cygwin implemented fstat/st=
ruct fstat (more in the *NIX way). Since Cygwin is not an option for us (=
everything is native Windows/Visual Studio), it does not help me in sayin=
g 'Cygwin is a solution'. I know that the GNU guys like Cygwin, but on Wi=
ndows, it is beyond reality to expect that Cygwin on Windows is a synonym=
 to native Windows. It is not.

[Please configure your mailer to wrap long lines]

I didn't say you had to use Cygwin, but was rather pointing out that
Cygwin is able to implement stat() on top of NTFS in a manner that
exposes NTFS' native inodes, so the native inodes exist and are
available through native Windows API (how else would cygwin be able to
get it).  And therefore it should be possible to write a gnulib stat()
replacement for mingw that uses the same tricks as cygwin uses to get at
the raw NTFS inode information.

>> At any rate, this is an issue that needs to be resolved in gnulib, as
>> more than just diffutils is affected by it.
>=20
> I don't know how Cygwin implements stat(),

It's open source, so you can find out by reading the source code.

https://cygwin.com/git/gitweb.cgi?p=3Dnewlib-cygwin.git;a=3Dblob;f=3Dwins=
up/cygwin/fhandler_disk_file.cc#l220

inline ino_t
path_conv::get_ino_by_handle (HANDLE hdl)
{
  IO_STATUS_BLOCK io;
  FILE_INTERNAL_INFORMATION fii;

  if (NT_SUCCESS (NtQueryInformationFile (hdl, &io, &fii, sizeof fii,
                                          FileInternalInformation))
      && isgood_inode (fii.IndexNumber.QuadPart))
    return fii.IndexNumber.QuadPart;
  return 0;
}

--=20
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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On 02/21/2017 01:21 AM, Kees Dekker wrote:
> the fix in diff is now very simple

That may be, but it's bad software engineering practice to apply a bunch 
of painful-to-maintain "simple" changes to diffutils and other programs 
when the real problem is elsewhere. Let's fix the real problem. Surely 
it is a simple fix to Gnulib.

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 <858F859BB4F2824EBAB5D4ED58214CB7016A455E28@HIDDEN>
 <4b2bd9d8-f59d-855d-a1ba-7fdbaa78279f@HIDDEN>
 <858F859BB4F2824EBAB5D4ED58214CB7016A45626E@HIDDEN>
From: Paul Eggert <eggert@HIDDEN>
Organization: UCLA Computer Science Department
Message-ID: <a688627e-7f16-abbc-033c-49c1dc69c3a1@HIDDEN>
Date: Tue, 21 Feb 2017 08:57:33 -0800
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On 02/21/2017 08:32 AM, Kees Dekker wrote:
> Do I need to do something else to put this on a TODO list of Gnulib?

I suggest sending email to bug-gnulib@HIDDEN It should be 
self-contained, i.e., assume readers are unfamiliar with this thread.

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