[bug #31148] Grub Loopback Module Does not Contain Offset Functionality

[Jakub Sadowski]

URL:
  <http://savannah.gnu.org/bugs/?31148>

                 Summary: Grub Loopback Module Does not Contain Offset
Functionality
                 Project: GNU GRUB
            Submitted by: kaboosh
            Submitted on: Tue 28 Sep 2010 10:22:34 AM GMT
                Category: Disk &amp; Partition
                Severity: Major
                Priority: 5 - Normal
              Item Group: Feature Request
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: Jakub Sadowski
        Originator Email: address@hidden
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 1.98
         Reproducibility: Every Time
         Planned Release: None

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Details:

The Linux loopback module and tools allow for a loopback device to be created
with an offset from a file or device.  To reproduce:

In Linux with a sata drive for testing:
dd if=/dev/zero of=/dev/sdX
losetup -o ARBITRARY_OFFSET_LESS_THAN_DISK_SIZE /dev/loopN /dev/sdX
mkfs.FSTYPE /dev/loopN
mkdir /mnt/loop && mount /dev/loopN /mnt/loop && mkdir /mnt/loop/boot
#memtest for testing - if grub can get the blue memtest screen we win!
cp /boot/memtest86-4.00 /mnt/loop/boot
umount /mnt/loop
losetup -d /dev/loopN

.
.
.

[build grub image with file system and loopback modules built in]
reboot
What grub2 commands do we use to access this offset filesystem?




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