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Date:	Sat, 04 Apr 2015 21:27:39 +0200
Reply-To:	"lemkemch AT t-online DOT de" <lemkemch AT t-online DOT de>
To:	cygwin AT cygwin DOT com
Message-ID:	<189698368655203b2bd9dcc6.25965034@email.t-online.de>
Subject:	Re: diff -r won't recurse
From:	"lemkemch AT t-online DOT de" <lemkemch AT t-online DOT de>

>
>-----Original-Nachricht-----
>Betreff: Re: diff -r won't recurse
>Datum: Sat, 04 Apr 2015 20:29:40 +0200
>Von: "lemkemch AT t-online DOT de" <lemkemch AT t-online DOT de>
>An: cygwin AT cygwin DOT com
>
>>On Sat, 04 Apr 2015 20:09:56 +0200 I wrote:
>>On Fri, 03 Apr 2015 16:50:09 +0200  Andrey Repin wrote:
>>>> I've got a strange problem: diff -r /d /g won't recurse into the two directories.  /d and /g are the
>>>> roots of two disks where /g is a clone (disk2vhd) of /d.  ls -R and other tools have no problems
>>>> to walk the tree.  strace doesn't give me a clue.  Any ideas?
>>>
>>Yes, that's what I expected.  And Erwin Waterlander suggested:
>>> there are no differences
>>> ;)
>>
>>I wish it were so.  Nevertheless (-s lists identical files):
>>orion> diff -q -r -s /d/Program\ Files /g/Program\ Files
>>orion> 
>>
>>But
>>orion> ls /d/Program\ Files /g/Program\ Files
>>/d/Program Files:
>>7-Zip                                        GPS-Track-Analyse-6                                PlotSoft
>>... snipped.
>>
>>/g/Program Files:
>>7-Zip                                        GPS-Track-Analyse-6                                PlotSoft
>>... more snipped.
>>
>>I am sure this got something to do with this being on a cloned disk running in a XP 
>>virtual machine (vmplayer on Win 8,1).
>>
>
>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

This was it.  I changed the Volume Serial Number with a Sysinternals tool
(https://technet.microsoft.com/en-us/sysinternals/bb897436.aspx)
and after a reboot diff now recurses into the directories in question.

Now is this a Cygwin bug or am I doing something terribly unsupported?

Thanks,
Michael

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