Message-ID: <4A6E2AB4.8010505@cygwin.com>
Date: Mon, 27 Jul 2009 18:31:16 -0400
From: "Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: ntfsclone for cygwin 1.7 (issues pointing to shadow copies)
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On 07/27/2009 05:48 PM, Rob Bosch wrote:
> The issue appears to be with ntfsclone in that it must point to
> something  in /proc/partitions. It will not work with any /cygdrive/X (used
> dosdev.c from Corinna and typical vshadow to expose as a drive with no luck). I found
> this out by commenting out the read-only check and rebuilding
> ntfsclone/ntfsinfo. The code apparently uses a win32_io.c file when building
> on cygwin. This file creates its own device mappings (e.g. /dev/hda1 instead
> of using the existing /dev/sda1). I guess there would be a way to modify it
> to use cygwin devices but I don't know how.
>
> If shadow copies could be presented as block devices to this library
> then  it would open up a lot of possibilities for creating block-level clones of
> partitions without having to boot to a live CD. I guess it is dd piped
> through gzip for now. It sure is a waste when you only have 50GB on a 500GB
> drive since dd processes the entire drive.
>
> Does anyone have anything else to add?  I'm guessing not...

Not much in the way of specific help, no, but I can make two observations:

   1. Using win32_io.c under Cygwin is almost certainly the wrong thing,
      since you'll then be using Win32isms in an environment built to expect
      POSIX mechanisms.

   2. It looks like /proc/partitions isn't populated, so if /proc/partitions
      is the only way that ntfsclone expects to be able to find what it
      wants, then it will be disappointed until a patch is supplied to
      support this.

-- 
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746

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A: Yes.
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