Follow-up Comment #4, bug #27737 (project grub):
I found a workaround. It seems that the problem is the extra subdirectory in
/dev/mapper.
If I recreate the block devices that are under /dev/mapper and place them
directly under /dev (with a different name), and update the device.map file
for grub2, then I can install grub onto the disk using grub-install
Step 1: lookup the major/minor created under /dev/mapper
Step 2: mknod the same devices directory under /dev
I created two devices /dev/mapper/sda and /dev/mapper/sda1 using dmsetup and
kpartx. /dev/mapper/sda received major device number 252 and minor 0, and
/dev/mapper/sda1 received minor 1.
Then I did:
mknod /dev/msda b 252 0
mknod /dev/msda1 b 252 1
Make sure that you mount /dev/msda1 instead of /dev/mapper/sda1, update your
device.map with "(hd0) /dev/msda" and voila, grub-install works.
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