test setup for https://github.com/docker/docker/pull/9006

setup.sh

#!/bin/sh

set -e

dd of=pool.img if=/dev/zero bs=1G count=2
dd of=meta.img if=/dev/zero bs=1G count=1

l1=$(sudo losetup -f)
sudo losetup ${l1} ./pool.img
l2=$(sudo losetup -f)
sudo losetup ${l2} ./meta.img

name=${name:-docker-test-pool}
l1size=$(sudo blockdev --getsz ${l1})
sudo dmsetup create ${name} \
        --table "0 ${l1size} thin-pool ${l2} ${l1} 512 8192"
sudo dmsetup suspend ${name}
sudo dmsetup resume ${name}

echo "start docker with '-s devicemapper --storage-opt "dm.thinpooldev=${name}"'"
echo "(cleanup with \`sh ./teardown.sh ${l1} ${l2}\`)"

teardown.sh

#!/bin/sh

set -e

if [ ${#@} -lt 2 ] ; then
        echo "please provide the two loop device paths"
        exit 1
fi

sudo dmsetup remove docker-test-pool

sudo losetup -d ${1}
sudo losetup -d ${2}

rm pool.img meta.img