Bug#494383: grub-pc: Grub2 cannot find LVM volume groups with a dash (-) in the name

[Felix Zielcke]

Hi,

Am Samstag, den 09.08.2008, 12:26 +0200 schrieb Felix Zielcke:

> fz-vm:~# ls /dev/mapper/
> control  linux--vg-lvol0
> 
And again it wasn't that clear with my first mail :(

fz-vm:~# l /dev/linux* /dev/mapper/
/dev/linux-vg:
insgesamt 0
lrwxrwxrwx 1 root root 27  9. Aug 14:49 lvol0
-> /dev/mapper/linux--vg-lvol0

/dev/linuxvg:
insgesamt 0
lrwxrwxrwx 1 root root 25  9. Aug 14:49 lvol0
-> /dev/mapper/linuxvg-lvol0

/dev/mapper/:
insgesamt 0
crw-rw---- 1 root root  10, 60  9. Aug 14:49 control
brw-rw---- 1 root disk 253,  1  9. Aug 14:49 linux--vg-lvol0
brw-rw---- 1 root disk 253,  0  9. Aug 14:49 linuxvg-lvol0

Current upstream SVN shows me:

fz-vm:/dev/mapper# grub-probe /mnt/
error: no mapping exists for `linux--vg-lvol0'
grub-probe: error: no mapping exists for `linux--vg-lvol0'

If I change the double dash to one and mount it again then it works
fine.

This bug happens at least with recent udev/lvm2 from Debian unstable
with kernel.org 2.6.27-rc2

I failed to find out how to workaround this in GRUB and I'm a bit unsure
if we even should do this.
What happens if this is fixed in lvm2/udev/kernel (wherever it belongs
too) and what is with people who like to have 2 dashes in there vg name?

(Robert: In this LVM case I think it's not that bad that
debian-installer currently prefers LILO over GRUB 2 ;))