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From:	Matthias Meyer <matthias DOT meyer AT gmx DOT li>
Subject:	Re: How to read ntfs_reparse_data
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Date:	Fri, 13 Sep 2013 19:14:36 +0200
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Andrey Repin wrote:

> Greetings, Matthias Meyer!
> 
>>>> I've installed cygwin 1.7.20 on my Windows7 and try to get reparse data
>>>> of a junction point:
>>>> getfattr -h -e hex -n system.ntfs_reparse_data
>>>> /cygdrive/C/Users/Default\ User but I get an error:
>>>> /cygdrive/C/Users/Default User: system.ntfs_reparse_data: Not supported
>>> 
>>>> If I mount the drive in Linux with ntfs-3g it will work. I get:
>>>> # file: /cygdrive/C/Users/Default User
>>>> system.ntfs_reparse_data=0x030000a0f00000000000760078006e005c....
>>> 
>>>> Anyone knows this "problem"? Is there a(nother) way to get the
>>>> system.ntfs_reparse_data? Maybee with a windows program?
>>> 
>>>> I'ld like to restore a junction point within Linux/ntfs-3g.
>>> 
>>> http://www.cygwin.com/
>>> The first four paragraphs.
>>> TL;DR: You're looking the wrong way.
> 
>> Thanks for the answer but it doesn't help me ;)
> 
> Ok, I can give you another answer, more detailed, but I have no idea, how
> much more usable, as I'm no expert in low-level NTFS specifics.
> I can imagine Cygwin tools being able to read, store and restore
> OS-specific file attributes, but I doubt these attributes have any use
> outside OS. I.e., I was unable to use NTFS junction point under Linux.
But not me ;)
If I can get the reparse data of a junction and store it in a backup I'm 
able to boot a PC into Linux and recreate the junction-point. That's my 
goal.
> Junction was to a second partition of the same drive, so there's no
> possibility of missing partitions or similar mistakes on my part. ntfs-3g
> just doesn't work the same way, as native Windows NTFS driver.
Maybee I missunderstood what you are saying. My english isn't well too :)
But ntfs-3g supports the reparse data. I can read (getfattr) the reparse 
data and I can create (setfattr) junctions too.
Unfortunatly it seems that getfattr didn't read the reparse data in cygwin 
environment.
> 
> Oh, also... Are you sure you have full low-level access to partition in
> question? I.e., it is not blocked by antivirus, or UAC?
> 
No, I'm not sure. In the meantime I find fsutil.exe and tried:
C:\> cd \Users\meyer
C:\> fsutil Cookies
Error: Access is denied.

But than I tried:
C:\> mklink /J test C:\Users\meyer\AppData\Roaming\....\Cookies
C:\> fsutil test
and this will work. I get my reparse data :)
I will see if I can reuse this data with setfattr.

br
Matthias
-- 
Don't Panic


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