#!/bin/sh
mkdir -p /media/doroot/var/lib/coreos

if [ ! -f "/media/doroot/var/lib/coreos/docker.img" ]; then
  DOFORMAT=1
fi

truncate -s 10G /media/doroot/var/lib/coreos/docker.img
LODEV=`losetup -f --show /media/doroot/var/lib/coreos/docker.img`

if [ -n "$DOFORMAT" ]; then
  mkfs.btrfs -L docker "$LODEV"
fi