Bug#423648: grub-pc: md/lvm path check in getroot.c breaks booting

[Robert Millan]

On Mon, May 14, 2007 at 09:59:15AM +0100, Sam Morris wrote:
> On Mon, 2007-05-14 at 10:54 +0200, Robert Millan wrote:
> > On Sun, May 13, 2007 at 08:32:58PM +0100, Sam Morris wrote:
> > > > Can you try arranging this code to include the missing "/dev/" and report if
> > > > everything still works?
> > > 
> > > Now this is more interesting. I no longer have the broken menu that I
> > > mentioned in the other bug report! However, when I actually select one
> > > of the entries, I get 'error: you need to load the kernel first'.
> > > 
> > > This seems to be caused by 'root' not being set in grub.cfg any more. Or
> > > rather, it's set to an empty string. Looking closely at update-grub, I
> > > guess changing grub_guess_root_device broke other parts of grub-probe:
> > > 
> > >         + echo 'Updating /boot/grub/grub.cfg ...'
> > >         Updating /boot/grub/grub.cfg ...
> > >         + cat
> > >         ++ grub-probe --target=device /boot/grub
> > >         + export GRUB_DEVICE=/dev/md0
> > >         + GRUB_DEVICE=/dev/md0
> > >         ++ grub-probe --target=drive /boot/grub
> > >         cannot find a GRUB drive for /dev/md0.
> > 
> > Check your device.map.  If it's broken, check if your newly modified
> > grub-mkdevicemap generates the right thing.
> 
> Adding '(md0) /dev/md0' triggers another error:
> 'error: /boot/grub/device.map:5: Bad device name'.

Sorry, I'm lost now.  I would suggest running a regression test from the latest
known-good date (look for Jeroen's RAID-related commits in upstream ChangeLog),
if you have the time.

I don't have time atm, but maybe later I can setup an LVM system to be able to
test such things.  Software RAID support is kinda abandoned atm.

-- 
Robert Millan

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