[Bug 1850202] Re: /etc/grub.d/10_linux_zfs doesn't add savedefault

[Brian Murray]

The Eoan Ermine has reached end of life, so this bug will not be fixed
for that release

** Changed in: grub2 (Ubuntu Eoan)
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1850202

Title:
  /etc/grub.d/10_linux_zfs doesn't add savedefault

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Eoan:
  Won't Fix
Status in grub2 source package in Focal:
  Fix Released

Bug description:
  [Impact]
  Ubuntu's ZFS boot support (`/etc/grub.d/10_linux_zfs`) does not add the `savedefault` command to non-recovery entries. This differs from the `/etc/grub.d/10_linux` (without ZFS) behavior, which adds `savedefault` to non-recovery entries.

  [Test Case]
  1. On a system that has a ZFS root (e.g. one installed with zsys), run `sudo update-grub`.

  2. See that there are no mentions of `savedefault` in the relevant
  generated section:

      sed -n '/^### BEGIN \/etc\/grub\.d\/10_linux_zfs ###$/,/^### END
  \/etc\/grub\.d\/10_linux_zfs ###$/p;/^### END
  \/etc\/grub\.d\/10_linux_zfs ###$/q' /boot/grub/grub.cfg | grep
  savedefault

  If this bug is fixed, the command above will return an output that has
  the string "savedefault".

  [Regression Potential]
  The patch makes the `/etc/grub.d/10_linux_zfs` logic for adding the `savedefault` command the same as that of `/etc/grub.d/10_linux`. It is a behavioral change but restores consistency with the non-ZFS Linux entry generator. The change should only affect those using the `GRUB_SAVEDEFAULT=true` and `GRUB_DEFAULT=saved` options in `/etc/default/grub`.

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