On Jul 27 18:31, Larry Hall (Cygwin) wrote: > 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.
/proc/partitions is populated, but only with actual disks. The device mapping for disks is a mapping from the internal NT namespace objects \Device\HarddiskX\PartitionY to the POSIX-like /dev/sdXY. Since shadow copies of a disk don't match this mapping, you're out of luck. Maybe we can add a mapping in a later Cygwin release and I added it to my TODO list, but this is definitely no fodder for 1.7.1. Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
