install script to change docker version on a docker-machine managed host

docker-install.sh

#!/bin/bash -x

# TODO: find a way to automated this variable
export CS_LATEST_VERSION=1.10.2-cs1

export HOME="$WORKSPACE"
DOCKER_MACHINE_OS=$(docker-machine ssh "$DOCKER_MACHINE_NAME" -- 'source /etc/os-release && echo "$ID-$ID_LIKE"')
DOCKER_MACHINE_USER=$(docker-machine inspect "$DOCKER_MACHINE_NAME" | jq -r '.Driver.SSHUser')

if ! [[ "$DOCKER_MACHINE_OS" =~ "debian" ]]; then
    echo "Only debian type distros are supported; ${DOCKER_MACHINE_OS} was detected" >&2 && exit 1
fi

## Set the Repo, Channel, Verisoning Info
VERSION_CHANNEL="main"
if [[ "$DOCKER_VERSION" =~ "_testing" ]]; then
    VERSION_CHANNEL="testing"
fi

# install docker
case "$DOCKER_VERSION" in
    *'-cs'*)
        # set the repo to be used with CS Engine 1.9+
        REPO_URL="https://packages.docker.com"
        if [[ "$DOCKER_VERSION" =~ "_staging" ]]; then
            REPO_URL="https://s3.amazonaws.com/packages.docker.com-staging"
        fi
        if [[ "$DOCKER_VERSION" =~ "latest" ]]; then
            DOCKER_VERSION="$CS_LATEST_VERSION"
        fi
        # parse the major.minor version ... if this is not latest
        MAJOR_VERSION=$(echo $DOCKER_VERSION | awk -F . '{print $1 "." $2;}')
        case "$MAJOR_VERSION" in
            1.6*)
                INSTALL_SCRIPT="
                curl -s https://packagecloud.io/install/repositories/Docker/cs-public/script.deb.sh | bash
                apt-get -o Dpkg::Options::='--force-overwrite' -o Dpkg::Options::='--force-confnew' install -y docker-engine-cs-${DOCKER_VERSION}
                "
                ;;
            *)
                INSTALL_URL="${REPO_URL}/${MAJOR_VERSION}/install.sh"
                ;;


        esac
        ;;
    *)
        case "$DOCKER_VERSION" in
            1.5.0|1.6.0|1.6.1|1.6.2)
            INSTALL_SCRIPT="
            apt-get update
            sh -c 'echo deb https://get.docker.com/ubuntu docker main > /etc/apt/sources.list.d/docker.list'
            apt-get install -y apt-transport-https
            apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
            apt-get update
            apt-get -o Dpkg::Options::='--force-overwrite' -o Dpkg::Options::='--force-confnew' install -y lxc-docker-${DOCKER_VERSION}
            "
            ;;
        latest)
            INSTALL_URL="https://get.docker.com"
            ;;
        latest_testing)
            INSTALL_URL="https://test.docker.com"
            ;;
        latest-master)
            INSTALL_SCRIPT="
            curl -sSL https://get.docker.com | bash
            service docker stop
            curl --output docker https://master.dockerproject.org/linux/amd64/docker
            chown root:root ./docker
            chmod 755 ./docker
            cp -p docker \$(which docker)
            service docker start
            "
            ;;
        *)
            INSTALL_SCRIPT="
            . /etc/lsb-release
            curl -sSL https://get.docker.com | sed 's/docker-engine/docker-engine=${DOCKER_VERSION}-0~\${DISTRIB_CODENAME}/g' | bash"
            ;;
        esac
        ;;
esac

if [[ -n "$INSTALL_URL" ]] ; then
    INSTALL_SCRIPT="curl -sSL ${INSTALL_URL} | repo=${VERSION_CHANNEL} bash"
fi

docker-machine ssh "$DOCKER_MACHINE_NAME" "sudo bash -x" <<EOF
    docker version
    apt-get remove -y docker-engine
    apt-get autoremove -y
    rm -f /etc/apt/sources.list.d/*ocker*
    ls -la /etc/apt/sources.list.d/

    $INSTALL_SCRIPT

    docker version
    usermod -a -G docker ${DOCKER_MACHINE_USER} ||:
EOF