get_dev_containing_directory.sh

# use e.g. to derive 
# INSTALL_DRIVE
# param for grub-install from the --efi-directory param
# $1 is e.g. /boot/efi
# then this will give you the current boot device

# note: grub-install creates device GUID specific boot config - will stop working when you assign new gpt partition guids


echo /dev/$(lsblk -no pkname $(df -P $1 | awk 'END{print $1}'))

mount -t proc proc proc/
mount -t sysfs sys sys/
mount -o bind /dev dev/