Public bug reported:
Description: Ubuntu 20.04.1 LTS
Release: 20.04
grub-common: 2.04-1ubuntu26.4
I expect grub-update to create grub.cfg with Linux entries for ZFS.
Instead I am left with an empty list and an unbootable OS.
The output from update-grub:
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Sourcing file `/etc/default/grub.d/kdump-tools.cfg'
Generating grub configuration file ...
/etc/grub.d/10_linux_zfs: 404: .: Can't open /tmp/zfsmnt.stGSQC/etc/os-release
Found memtest86+ image: /memtest86+.elf
Found memtest86+ image: /memtest86+.bin
done
This is failing because I have a separate ZFS filesystem for /usr. The
10_linux_zfs script is gathering information from /etc/os-release which
is a symlink to ../usr/lib/os-release.
The first issue I see in 10_linux_zfs is under function get_dataset_info() at
line 382:
mount -o noatime,zfsutil -t zfs "${base_dataset}" "${mntdir}"
Since /usr is under a separate filesystem, the symlink would be broken
and the script fails. This should mount /usr as well if it is a
separate filesystem.
The next issue I see is when the script iterates the zsys snapshots at line 514:
for snapshot_dataset in $(zfs list -H -o name -t snapshot "${dataset}"); do
boot_list="${boot_list}$(get_dataset_info ${snapshot_dataset} ${mntdir})\n"
done
You would get a similar error message about os-release.
/etc/grub.d/10_linux_zfs: 410: .: Can't open
/.zfs/snapshot/autozsys_oiimb5/etc/os-release
Again, the script should consider reading the /usr snapshot as well if
it is a separate filesystem.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1899372
Title:
update-grub 10_linux_zfs fails when /usr is a separate filesystem
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