~ubuntu-core-dev/partman-btrfs/ubuntu

#!/bin/sh

set -- $1

fs=$1

mp=$2

type=$3

options=$4

dump=$5

pass=$6

case $type in

    btrfs)

	options="${options%,subvol=*}"

	#for removing the option subvol,when thats the only option

	#eg: options=="subvol=@", no comma present

	options="${options%subvol=*}"

	mount -t btrfs ${options:+-o "$options"} $fs /target$mp || exit 1

	case $mp in

	    /)

		btrfs subvolume create /target$mp/@

		umount /target$mp

		options="${options:+$options,}subvol=@"

		mount -t btrfs -o $options $fs /target$mp

		;;

	    /home)

		btrfs subvolume create /target$mp/@home

		umount /target$mp

		options="${options:+$options,}subvol=@home"

		mount -t btrfs -o $options $fs /target$mp

		;;

	esac

	echo "umount /target$mp"

	exit 0

	;;

esac

exit 1