#!/bin/sh

PREREQ=""

prereqs()
{
	echo "$PREREQ"
}

case $1 in
# get pre-requisites
prereqs)
	prereqs
	exit 0
	;;
esac

. /usr/share/initramfs-tools/scripts/functions

# Report in excruciating detail if the -v option is used
report_verbose()
{
	test "${verbose?}" != y || echo "I: $*"
}

if [ $(findmnt / -n -o fstype) != "btrfs" ]; then
	report_verbose "Root filesystem type not btrfs"
	exit 0
fi

maindev=$(findmnt / -n -o source -v)
report_verbose "First root filesystem device is '$maindev'"

conffile="${DESTDIR}/conf/btrfs-lvm"
:>$conffile

for dev in $(btrfs filesystem show $maindev | awk '/devid/ {print $8}'); do
	report_verbose "Checking component device '$dev'"
	if lvs "$dev" >/dev/null; then
		report_verbose "'$dev' is an LVM LV, adding to config file"
		echo "$dev" >>$conffile
	else
		report_verbose "'$dev' is not an LVM LV, skipping"
	fi
done

report_verbose "Finishing probing '$maindev'"