Bug#627587: grub-pc: grub-probe: error: cannot stat `/dev/root'.

[Colin Watson]

tag 627587 pending
thanks

On Fri, May 27, 2011 at 11:09:21PM +0300, Adrian Bunk wrote:
> On Sun, May 22, 2011 at 11:19:06AM +0100, Colin Watson wrote:
> > On Sun, May 22, 2011 at 01:02:01PM +0300, Adrian Bunk wrote:
> > > grub-probe: error: cannot stat `/dev/root'.
> > 
> > Looks like #621738, which only affects people without initrds
> 
> Matched my setup.
> 
> > (I'm not sure if that's a sufficient condition, but I gather it's a
> > necessary condition).  Do you have the most recent udev package
> > installed?
> 
> I did not, and it works after an udev upgrade.
> 
> It seems that has to be expressed through a Conflicts on older udev 
> versions?

(That should be Breaks, nowadays.)

I'm not sure how effective that will be.  After all, the bug only
affects users of systemd, by the looks of that other bug, and popcon
only shows systemd being used by at most 0.2% of the users of grub2, and
even then it's only the subset without initrds who are affected.  The
rest have no need to upgrade.  Plus, it's not clear to me from that
other bug report whether you need to reboot with the new udev or
otherwise manually restart udev before the fix is effective, and if so
then a Conflicts/Breaks would be insufficient anyway; and, by the time
grub2 packages with such a change reach testing, a fixed udev might well
already be there.

Still, I suppose I can give it a go (at least on non-Ubuntu-derived
systems; Ubuntu's udev doesn't share history with Debian's).  At the
very least, it might serve as some kind of documentation.

Cheers,

-- 
Colin Watson                                       [cjwatson at debian.org]