[Bug 1876331] Re: update-grub fails to add ZFS menu entries

[Jim Hunziker]

Ah - that's it! My /bin/sh is symlinked to /bin/bash. I believe
following the instructions for installing a GNU Radio SDK is why I made
that change:

"On some distributions (e.g. Ubuntu), PyBOMBS can run into shell issues. To avoid those problems, it is recommended to run the following command
before continuing, and choose "no" in the prompted dialogue:
$ sudo dpkg-reconfigure dash"

Is it expected that changing the system's default shell would break
scripts?

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https://bugs.launchpad.net/bugs/1876331

Title:
  update-grub fails to add ZFS menu entries

Status in grub2 package in Ubuntu:
  Confirmed

Bug description:
  This is for:

  Ubuntu 20.04 LTS
  grub-common 2.04-1ubuntu26

  I don't know how I got into this mess (maybe by removing ZFS @install
  snapshots?), but update-grub stopped adding any Ubuntu entries to my
  menu.cfg.

  The culprit is the use of \t as a field separator in
  /etc/grub.d/10_linux_zfs.

  There's a line that says:
          echo "${dataset}\t${is_zsys}\t${machine_id}\t${pretty_name}\t${last_used}\t${initrd_device}\t${initrd_list}\t${kernel_list}\t${last_booted_kernel}"

  
  Instead, it should say:
          echo -e "${dataset}\t${is_zsys}\t${machine_id}\t${pretty_name}\t${last_used}\t${initrd_device}\t${initrd_list}\t${kernel_list}\t${last_booted_kernel}"

  By default, echo does not interpret the escaped tab sequence, \t. So
  all of the awk lines that use it as a field separator elsewhere in the
  script fail.

  Adding the above -e flag fixed my problem.

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