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Re: grub 1.99 configuration

From: Bruce Dubbs
Subject: Re: grub 1.99 configuration
Date: Thu, 23 Jun 2011 21:18:20 -0500
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20080722 SeaMonkey/1.1.11

Vladimir 'φ-coder/phcoder' Serbinenko wrote:
On 12.06.2011 04:28, Bruce Dubbs wrote:
I'm trying to manually run grub-mkconfig to establish grub-1.99
installation instructions for Linux From Scratch.

I am getting:

grub-mkconfig -o /boot/grub/grub.cfg
  /usr/sbin/grub-probe: error: cannot stat `/dev/root'

Doing some investigating grub-mkconfig is running:
  /usr/sbin/grub-probe --target=device /

Drilling down, grub-probe is doing:
  device_name = grub_guess_root_device (path);

Which in turn is doing:
  grub_find_root_device_from_mountinfo( "/", NULL );

This is reading /proc/self/mountinfo.  The problem here is that this
file does not give the device, but specifies /dev/root:

13 1 8:15 / / rw,relatime - ext3 /dev/root

The kernel is, but 2.6.37 seems to give the same thing.
grub-probe should be able to detect /dev/sda15, but fails on newer

grub-probe for grub-1.98 works fine.  A grep there shows no use of


update either udev or grub. normally /dev/root should be a symlink.
Newer grub-probe can cope with some other arrangements as well

Well I'm using udev-171. That is the most recent version. We don't like to non-release package versions in LFS, but we do occasionally patch files.

I don't know when /dev/root became a 'device'. Udev doesn't create it. We also don't use an initrd. That's not needed when you know in advance what your hardware configuration is.

I did work around the problem by manually creating the symlink. I do not know of anything other than GRUB that needs it, but I don't use lvm.

In any case, I don't think GRUB should choke because /dev/root is missing.

  -- Bruce

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