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Date:	Tue, 28 May 2013 15:35:14 +0200
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: Shadowcopy volume block devices
Message-ID:	<20130528133514.GJ5264@calimero.vinschen.de>
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User-Agent:	Mutt/1.5.21 (2010-09-15)

On May 28 18:21, Micky wrote:
> Seems like the latest Cygwin made some progress in automounting and
> accessing the VSS volumes. i.e. under
> /proc/sys/Device/HarddiskVolumeShadowCopy
> But it doesn't let you access the volumes as block devices. The w32
> name space paths like "\\.\HarddiskVolumeShadowCopy" can be accessed
> at cmd.exe but not in Cygwin.

This is kind of mind-boggling.  If you knew that you could access
HarddiskVolumeShadowCopy using the POSIX path

  /proc/sys/Device/HarddiskVolumeShadowCopy

why didn't you try to use the POSIX path as device name in a call to the
POSIX tool dd, rather than translating it into a Win32 path?  It's clearly
marked as block device in the directory listing:

  $ ls -l /proc/sys/Device/HarddiskVolumeShadowCopy1
  brwxrwx--x 1 Administrators SYSTEM 0, 250 May 28 15:31 HarddiskVolumeShadowCopy1

and here's what I get when running od -c on it as admin:

  $ od -c /proc/sys/Device/HarddiskVolumeShadowCopy1 | head -1
  000 353   R 220   N   T   F   S                  \0 002  \b  \0  \0


Corinna

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

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