Bug#607642: More info for #607642

[Paul Brook]

> On 01/07/2011 01:26 PM, Paul Brook wrote:
> > Further investigation shows that it's actually the use of GUID partition
> > tables that cause confusion. grub-probe correctly identifies filesystem
> > and LVM device, but fails to map partitions for the constituent devices.
> > 
> > The lack of GUID partition table support is not directly relevant to this
> > bug. I'm sure there are other partitioning schemes that grub does not
> > understand.
> 
> GPT is supported by GRUB. As long as it correctly has 0xee partition in
> its protective MBR.

GPT support (or lack of) is a tangential issue.

The issue is that grub should gracefully cope with cases where it is unable to 
access some partitions.  The probe function (is_path_readable_by_grub) fails 
to check for appropriate partmap support, causing higher level code to make 
incorrect decisions.

Paul