Test docker run on fresh device

testrun.sh

#!/bin/env sh

# testrun.sh runs a docker container on a fresh device
# to test for errors mounting and running a container.
#
# Usage:
#   sh testrun.sh <device> <storage driver> <image> [<run arg>, ...]
#
# How to use:
#   $ fallocate -l 2GB testvolume
#   $ device=$(sudo losetup -f --show ./testvolume)
#   $ sudo mkfs -t xfs -m crc=0 -n ftype=0 -f $device
#   $ sudo sh testrun.sh $device overlay ubuntu:latest /bin/echo "Works just fine!"


tmpdir=$(mktemp -d)
device=$1
graphdriver=$2
shift
shift

mount $device $tmpdir
echo "Mounted $device to $tmpdir"

echo "Starting docker engine using $graphdriver storage driver"
docker daemon -D -s $graphdriver -g $tmpdir > /tmp/dockertestlog.txt 2>&1 &

sleep 10

docker run $@

kill $(cat /var/run/docker.pid)

sleep 2

umount $tmpdir

rmdir $tmpdir

echo "Unmounted and remove $tmpdir"