Isolated Docker daemon (for testing and portability)

docker.sh

#!/bin/sh

set -e

while getopts Dd:s:f:H: c; do
	case $c in 
		H) # docker socket to use
			export DOCKER_HOST="$OPTARG"
			;;
		d) # docker binary to use
			export DOCKER="$OPTARG"
			;;
		f) # file to use on loop back
			export filename="$OPTARG"
			;;
		S) # filesize of the loopback
			export filesize="$OPTARG"
			;;
		s) # storage driver to use
			export DOCKER_STORAGE_DRIVER="$OPTARG"
			;;
		D) # verbose
			set -x
			;;
	esac
done

CWD="$(dirname $(readlink -f $0))"
DOCKER=${DOCKER:-${CWD}/docker-1.7.0-dev}
filename=${filename:-${CWD}/btrfs.img}
filesize=${filesize:-100G}
DOCKER_HOST=${DOCKER_HOST:-tcp://0.0.0.0:6666}
DOCKER_STORAGE_DRIVER=${DOCKER_STORAGE_DRIVER:-btrfs}

if [ ! -f "${filename}" ] ; then
	truncate -s "${filesize}" "${filename}"
	devname=$(losetup -f --show "${filename}")
	if [ "x$DOCKER_STORAGE_DRIVER" = "xbtrfs" ] ; then
		mkfs.btrfs "${devname}"
	elif [ "x$DOCKER_STORAGE_DRIVER" = "xoverlay" ] ; then
		mkfs.ext4 "${devname}"
	else
		echo "do not know what to do with $DOCKER_STORAGE_DRIVER"
		losetup -d ${devname}
		exit 1
	fi
	losetup -d ${devname}
fi

mount -o loop "${filename}" "${CWD}/docker"
trap "umount ${CWD}/docker" SIGINT SIGTERM

echo "export DOCKER_HOST=${DOCKER_HOST}"
echo "alias docker=${DOCKER}"
echo "(press enter to continue)"
read
DEBUG=1 "${DOCKER}" -d -D -H ${DOCKER_HOST} -s "${DOCKER_STORAGE_DRIVER}" -g "${CWD}/docker" -p "${CWD}/docker.pid"