grub-multi-install: get_mounted_device chokes on systemd automounts

[Andrej Shadura]

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.

[Ubuntu Foundations Team Bug Bot (crichton)]

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.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]