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Date:	Tue, 7 Apr 2015 11:14:27 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: diff -r won't recurse
Message-ID:	<20150407091427.GC2819@calimero.vinschen.de>
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On Apr  4 21:51, Jeffrey Altman wrote:
> On 4/4/2015 3:27 PM, lemkemch AT t-online DOT de wrote:
> >> Clutching at straws (note the identical serial number, does it confuse=
 Cygwin?):
> >>
> >> orion> /usr/lib/csih/getVolInfo.exe /g
> >> Device Type        : 7
> >> Characteristics    : 20
> >> Volume Name        : <ND D (HDD)>
> >> Serial Number      : 3357258338
> > ...
> >>
> >> orion> /usr/lib/csih/getVolInfo.exe /d
> >> Device Type        : 7
> >> Characteristics    : 20
> >> Volume Name        : <ND D (HDD)>
> >> Serial Number      : 3357258338
> >=20
> > This was it.  I changed the Volume Serial Number with a Sysinternals to=
ol
> > (https://technet.microsoft.com/en-us/sysinternals/bb897436.aspx)
> > and after a reboot diff now recurses into the directories in question.
> >=20
> > Now is this a Cygwin bug or am I doing something terribly unsupported?
>=20
> The serial number is used by many tools to track the volumes that are
> crossed by reparse points to ensure that a loop does not occur.  I
> suspect that in this case the tool is concluding that the reparse point
> is referring back to the same volume.

Just as an extra datapoint, the serial number is used by Cygwin as the
st_dev value for a filesystem.  If diff checks st_dev to recognize
filesystems and mount points, it will see the same filesystem in the
above case.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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