OK, I think I've found the bug; there are two issues;
if [ "${#grubdevs_new[@]}" -eq 1 ] && [ -f "${grubdevs_new[0]}" ]; then
# Currently UEFI can only be pointed to one system partition. If
# for some reason multiple install locations are given only use the
# first.
efi_dev="${grubdevs_new[0]}"
elif [ "${#grubdevs_new[@]}" -gt 1 ]; then
error "Only one grub device supported on UEFI!"
exit 1
else
# If no storage configuration was given try to determine the system
# partition.
efi_dev=$(awk -v "MP=${mp}/boot/efi" '$2 == MP { print $1 }' /proc/mounts)
fi
The [ -f "${grubdevs_new[0]}" ] is checking if the target disk/partition is a
file.
This fails as they are block devices; the check should be [ -b
"${grubdevs_new[0]}" ].
Because this fails, we fall into the else clause, which is able to figure out
from
/proc/mounts that the efi_dev is /dev/sda1.
Now, further down when we convert the efi_dev into the disk and
partition we run this code
# The partition number of block device name need to be determined here
# so both getting the UEFI device from Curtin config and discovering it
# work.
efi_part_num=$(cat /sys/class/block/$(basename $efi_dev)/partition)
efi_disk="/dev/$(lsblk -no pkname $efi_dev)"
lsblk -no pkname $efi_dev
returns an empty string; that's because 'pkname' is an unknown column in lsblk,
rather the value should be 'kname'. This error results in efi_disk being set
to "/dev/"
This isn't found on non-shim based installs as efi_disk variable is not
used unless we are creating our own efibootmgr entry.
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https://bugs.launchpad.net/bugs/1862846
Title:
Crash and failure installing focal
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