[Bug 1859090] Re: [zfs-root] Trivial bug in 10_linux_zfs breaks booting from ZFS mirrored boot pools

[Jean-Baptiste Lallement]

*** This bug is a duplicate of bug 1848856 ***
    https://bugs.launchpad.net/bugs/1848856

Thank you for your report.

This bug has already been reported in bug 1848856 and fixed in the
latest development release. There is an SRU in progress to fix it in
19.10.

I'm marking your report as duplicate.

** Tags added: zfs

** This bug has been marked a duplicate of bug 1848856
   zfs on root fails with grub syntax error with multidisks pools

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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

Status in grub2 package in Ubuntu:
  New

Bug description:
  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.

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