[Bug 1948571] Re: grub-multi-install: get_mounted_device chokes on systemd automounts

[Ubuntu Foundations Team Bug Bot]

The attachment "0001-Teach-get_mounted_device-to-not-choke-on-
automounted.patch" seems to be a patch.  If it isn't, please remove the
"patch" flag from the attachment, remove the "patch" tag, and if you are
a member of the ~ubuntu-reviewers, unsubscribe the team.

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https://bugs.launchpad.net/bugs/1948571

Title:
  grub-multi-install: get_mounted_device chokes on systemd automounts

Status in grub2 package in Ubuntu:
  New

Bug description:
  On systems where /boot/efi is a systemd .automount, the postinst
  script fails without any error messages. While trying to figure out
  what’s wrong, I found this:

  Trying to migrate /boot/efi into esp config
  ++ get_mounted_device /boot/efi
  ++ mountpoint=/boot/efi
  ++ cat /proc/mounts
  ...
  ++ read -r line
  ++ set -f
  ++ set -- systemd-1 /boot/efi autofs rw,relatime,fd=51,pgrp=1,timeout=60,minproto=5,maxproto=5,direct,pipe_ino=2548 0 0
  ++ set +f
  ++ '[' /boot/efi = /boot/efi ']'
  ++ echo systemd-1
  ++ break
  + esp=systemd-1
  + '[' systemd-1 ']'
  ++ device_to_id systemd-1

  get_mounted_device doesn’t know that automounts are special. The
  attached patch teaches is to go one step further and attempt to
  resolve it.

  Please note that I didn’t improve error handling, this still needs to
  be done.

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