Public bug reported:
If you manually modify a Ubuntu 19.10 on ZFS install to do mirroring,
running update-grub will generate a /boot/grub/grub.cfg missing the file
paths for the vmlinuz and initrd.img files, which creates an unbootable
system. update-grub will report "Syntax errors are detected in generated
GRUB config file.".
The problem occurs because of a single line
`initrd_device=$(${grub_probe} --target=device "${boot_dir}")` in
`get_dataset_info()` in `/etc/grub.d/10_linux_zfs`. The code is designed
to expect a single device, but a mirrored pool will give two. This
inserts boht devices separated by a line break, which messes up the
script.
Changing the line in question to `initrd_device=$(${grub_probe}
--target=device "${boot_dir}" | head -1)` will workaround the problem.
Looking at what is being done, I think this change could go into
production without any ill effect. I have attached a patch with the
change.
As for the other information requested by the bug reporting guidelines:
1) $ lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10
2) $ apt-cache policy grub-common
grub-common:
Installed: 2.04-1ubuntu12.1
Candidate: 2.04-1ubuntu12.1
Version table:
*** 2.04-1ubuntu12.1 500
500 http://us.archive.ubuntu.com/ubuntu eoan-updates/main amd64 Packages
100 /var/lib/dpkg/status
2.04-1ubuntu12 500
500 http://us.archive.ubuntu.com/ubuntu eoan/main amd64 Packages
3) The system should have been fine with a mirrored boot pool.
4) A bug broke the boot process. A patch fixing it is attached.
** Affects: grub2 (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "This trivial patch fixes the issue."
https://bugs.launchpad.net/bugs/1859090/+attachment/5318931/+files/10_linux_zfs-mirror-bpool-support.patch
** Package changed: os-prober (Ubuntu) => grub2 (Ubuntu)
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https://bugs.launchpad.net/bugs/1859090
Title:
[zfs-root] Trivial bug in 10_linux_zfs breaks booting from ZFS
mirrored boot pools
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