URL:
<http://savannah.gnu.org/bugs/?37418>
Summary: update-grub does finds only one system on btrfs
volume
Project: GNU GRUB
Submitted by: pancake
Submitted on: Fri 21 Sep 2012 06:40:07 PM GMT
Category: Filesystem
Severity: Major
Priority: 5 - Normal
Item Group: None
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:
Grub and the working environment are installed on a btrfs subvolume.
update-grub does not find any other linux systems on different subvolumens
(same btrfs filesystem).
To reproduce on debian with btrfs-tools:
Have a spare device, say /dev/sdc1
mkfs.btrfs /dev/sdc1
mount /dev/sdc1 /mnt
btrfs subvol create /mnt/first
debootstrap unstable /mnt/first
mount --bind /dev /mnt/first/dev
mount --bind /proc /mnt/first/proc
mount --bind /sys /mnt/first/sys
chroot /mnt/first
apt-get install linux-image-3.2*
apt-get install grub2
At this point it correctly detects a single system on btrfs. Now
exit
btrfs subvol snapshot /mnt/first /mnt/second
This creates two distinct systems, yet
chroot /mnt/first
update-grub
Yields only a single result on btrfs volume. We can boot to the other one by
changing /boot/grub/grub.cfg (s/first/second in rootflags=subvol=X) but it
should detect different systems automatically. Also does not work when
installing two distinct systems instead of cloning one as demonstrated here.
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