[bug #32603] update-grub does not recognize all OSs from live-session

[Yann]

URL:
  <http://savannah.gnu.org/bugs/?32603>

                 Summary: update-grub does not recognize all OSs from
live-session
                 Project: GNU GRUB
            Submitted by: yannubuntu
            Submitted on: sam. 26 févr. 2011 04:31:07 GMT
                Category: Configuration
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: 1.98
         Reproducibility: Every Time
         Planned Release: None

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Details:

Dear all

I am developping a software running on a Debian-based (e.g. Ubuntu 10.10)
live-CD, that needs to update GRUB of any installed Linux.

Here is how I proceed :
mount /dev/${OS_PARTITION} /mnt
mount --bind /dev /mnt/dev
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
chroot /mnt/ bash update-grub
umount /mnt/dev
umount /mnt/proc
umount /mnt/sys
umount /mnt

Result : GRUB is updated but it does not detect all OSs (Linux installed on
internal disks are recognized, but not Linux on USB disks, and sometimes nor
Windows on internal disk)
Expected result : the updated GRUB detect all OSs

For information:
- "sudo os-prober" (from the live-session) detects all OSs.
- when I boot into any Linux then launch "sudo update-grub", all OSs are
detected.

Is it a GRUB bug , or am I missing something in the way to chroot ?










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