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Reply-To: moss AT cs DOT umass DOT edu
Subject: Re: Issue when trying to access files on a locked BitLocker volume
To: cygwin AT cygwin DOT com
References: <CAFBd_9syterX=7PSFb2+Z_KWMxvdrH3o_Rq3oJ65AVOYDX2=ig AT mail DOT gmail DOT com>
From: Eliot Moss <moss AT cs DOT umass DOT edu>
Message-ID: <aece26f1-c443-2ce6-b5df-5f5eecffa902@cs.umass.edu>
Date: Thu, 19 Apr 2018 07:44:37 -0400
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On 4/19/2018 7:38 AM, Vincent Gheur wrote:
> Hi,
> 
> I'm using a Bitlocker encrypted SD card, which stays most of the time in my
> laptop, but is generally not unlocked. I'm unlocking it only when I need to
> access files on it.
> 
> I have also a script which is started at regular intervals, which copies
> some critical files on the SD card when it is unlocked. I was using till
> recently a *very* old version of cygwin (probably downloaded 10 years ago),
> in which I could check whether my SD card was unlocked or not by using *if
> [ -d <folder-on-SD-card> ]*. I have downloaded a new version of cygwin in
> January, as I migrated to Windows 10 and was encountering some issues with
> it. Since I upgraded, this test is not working anymore. When the SD card is
> unlocked, testing " -d <folder> " returns TRUE. It returns FALSE when I do
> the same test on a non Bitlocker volume for a non-existent folder (which is
> the expected behaviour).
> 
> I guess there are probably other issues related to accessing locked
> Bitlocker volumes.
> 
> 
> If someone is wanting to solve this, don't hesitate to contact me if you
> need more details or if you want me to make tests.

I agree that this outcome is strange, but here are some suggestions for
workarounds:

- Test some other property of the same or some other file
- Try some program, such as ls, on the file.  You can direct standard
   output and error to /dev/null and check the result code to see if the
   program failed.
- Try a program that requires write capability, such as touch, if ls does
   not do what you need.

Regards - Eliot Moss

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