[Bug 1888400] Re: grub-common: generated xen boot entries incorrect with root on zfs

[James Dingwall]

** Package changed: ubuntu => grub2 (Ubuntu)

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Title:
  grub-common: generated xen boot entries incorrect with root on zfs

Status in grub2 package in Ubuntu:
  New

Bug description:
  I have a system with a ZFS root (/) and which boots xen.  The
  generated grub.cfg kernel command line is ok for a non-xen boot but is
  missing the pool name from the xen entries.  Since upgrading from
  18.04 it is necessary to modify the command line via the grub editor
  during boot or edit grub.cfg directly.

  i.e. direct linux looks like:

  linux   /vmlinuz-5.4.0-40-generic root=ZFS=rpool/ROOT/ubuntu ro

  and xen entries look like:

  module2 /vmlinuz-5.4.0-33-generic placeholder root=ZFS=/ROOT/ubuntu ro
  console=hvc0 console=tty0  earlyprintk=xen

  grub's 10_linux includes this block:

          # We have a more specialized ZFS handler, with multiple system in 10_linux_zfs.
          if [ -e "`dirname $(readlink -f $0)`/10_linux_zfs" ]; then
            exit 0
          fi

  but no similar provision for systems booting xen has been made.

  
  # lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 20.04 LTS
  Release:        20.04
  Codename:       focal

  # apt-cache policy grub-common
  grub-common:
    Installed: 2.04-1ubuntu26
    Candidate: 2.04-1ubuntu26
    Version table:
   *** 2.04-1ubuntu26 500
          500 http://gb.archive.ubuntu.com/ubuntu focal/main amd64 Packages
          100 /var/lib/dpkg/status

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