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Date: Thu, 16 Feb 2017 10:26:11 +0100
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: Cannot access volumes mounted with 'mklink /d' which point to a volume UUID
Message-ID: <20170216092611.GE3889@calimero.vinschen.de>
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References: <58A4741E DOT 5020408 AT gmail DOT com>
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On Feb 15 07:30, Matt D. wrote:
> On Windows you can create symbolic links which point to volume UUIDs as a
> way of mounting and unmounting them without having to use the administrat=
ive
> disk management tools.
>=20
> For example, in cmd:
>=20
> mountvol
> ...
>     \\?\Volume{079b79c9-0000-0000-0000-100000000000}\
>         C:\
> ...
> mklink /d test \\?\Volume{079b79c9-0000-0000-0000-100000000000}\
> ...
> dir test
>=20
> I call mounvol to get a list of volumes and create a symbolic link 'test'
> which points to the C:\ UUID. When I then 'dir test' it will list all fil=
es
> on that volume.
>=20
> If I try to access it through Cygwin Bash I get the following error:
>=20
> $ dir test/
> dir: cannot access 'test/': No such file or directory
>=20
> This makes it difficult to work with unmounted volumes as it's not always
> possible to access the administrative disk management snap-in and the
> mountvol/mklink has always been my go-to for this type of functionality. =
It
> would be great if Cygwin would support it.

This type of directory symlink to a GUID volume path isn't supported
at all yet in Cygwin.  However, you can access the directory directly
without having to go through MKLINK.  In Cygwin:

  $ cd /proc/sys/GLOBAL\?\?/Volume{079b79c9-0000-0000-0000-100000000000}/

or

  $ ln -s \
  /proc/sys/GLOBAL\?\?/Volume\{079b79c9-0000-0000-0000-100000000000}/ \
  my_vol
  $ cd my_vol

Note the trailing slash.  Volume{079b79c9-0000-0000-0000-100000000000}
without the slash is the block device.
Volume{079b79c9-0000-0000-0000-100000000000}/ with trailing slash is the
filesystem on the block device.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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