[Bug 1889757] [NEW] zfs root with ext3 /boot fails to create grub menu entries

[Matt Johnston]

Public bug reported:

10_linux was changed to exit early if / is zfs. That doesn't work if /boot is a ext4 filesystem which should be detected by the rest of 10_linux.
The result is that grub doesn't create any entries for any kernels and the system isn't bootable, manual intervention is required.

I guess it should only "exit 0" if /boot is also zfs.
https://git.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/tree/debian/patches/ubuntu-zfs-enhance-support.patch?h=focal&id=6c5bbbb53b73060b4e8b1e8c00ab475ddb385b4e#n55


In this case /boot is a symlink into a ext4 filesystem, though I think the same thing would happen with /boot as a toplevel ext4 filesystem.

This is grub2 (2.04-1ubuntu26.1) focal.

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1889757

Title:
  zfs root with ext3 /boot fails to create grub menu entries

Status in grub2 package in Ubuntu:
  New

Bug description:
  10_linux was changed to exit early if / is zfs. That doesn't work if /boot is a ext4 filesystem which should be detected by the rest of 10_linux.
  The result is that grub doesn't create any entries for any kernels and the system isn't bootable, manual intervention is required.

  I guess it should only "exit 0" if /boot is also zfs.
  https://git.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/tree/debian/patches/ubuntu-zfs-enhance-support.patch?h=focal&id=6c5bbbb53b73060b4e8b1e8c00ab475ddb385b4e#n55

  
  In this case /boot is a symlink into a ext4 filesystem, though I think the same thing would happen with /boot as a toplevel ext4 filesystem.

  This is grub2 (2.04-1ubuntu26.1) focal.

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