Install the latest stable Docker and associated tools.

docker.install.sh

#!/usr/bin/env bash
## Install the latest stable Docker and associated tools.
## By Stephen D. Rogers <inbox@c7r@steve-rogers.com>, 2017-04.
##

set -e

cmd_apt_get="${cmd_apt_get:-xx sudo apt-get --quiet}"

my_user_name="${my_user_name:-$(id -un)}"

if [ "$(type -t os_release_id)" != "function" ] ; then
get_os_release_id() {
	local f1

	for f1 in /etc/os-release ; do
	(
		[ -e "$f1" ] || continue
		source "$f1"
		echo "${ID}"
	)
	done
}
fi

os_release_id="$(get_os_release_id)"
if [ -z "${os_release_id}" ] ; then
	echo 1>&2 "Cannot determine operating system release ID"
	exit 1
fi

if [ "$(type -t sudo)" != "function" ] ; then
sudo() {
	if [ "$(id -u)" -eq 0 ] ; then
		"$@"
	else
		command sudo "$@"
	fi
}
fi

if [ "$(type -t never_mind_optional_package)" != "function" ] ; then
never_mind_optional_package() {
	echo 1>&2 "^-- Package is not required; continuing without it..."
}
fi

if [ "$(type -t xx)" != "function" ] ; then
xx() {
	echo 1>&2 "+" "$@"
	"$@"
}
fi

##

docker_apt_repository_url="https://download.docker.com/linux/${os_release_id}"
docker_apt_repository_gpg_key_url="https://download.docker.com/linux/${os_release_id}/gpg"
docker_apt_repository_gpg_key_fingerprint="0EBFCD88"

docker_machine_version=0.12.2 # see <https://github.com/docker/machine/releases/>
docker_machine_version=0.13.0 # see <https://github.com/docker/machine/releases/>
docker_machine_download_url="https://github.com/docker/machine/releases/download"
docker_machine_script_url="${docker_machine_download_url}/v${docker_machine_version}/docker-machine"-`uname -s`-`uname -m`

docker_version() {
	(docker --version 2>&- || :) |

        perl -pe 's{^([^\d]*?)([\d.]+)(.*$)}{$2}'
}

docker_version_major() {
	docker_version | perl -pe 's{\..*}{}'
}

docker_version_major_min=17

docker_os_release_code_name() {
	local result="$(lsb_release -cs)"
	case "$result" in
	artful)
		result=zesty # as of 2017-12-22: no build for Ubuntu 17.10; use 17.04 build instead
		;;
	esac

	echo "$result"
}

install_docker_apt_repository() {
	$cmd_apt_get install -y apt-transport-https ca-certificates curl software-properties-common

	xx curl -fsSL "${docker_apt_repository_gpg_key_url}" | xx sudo apt-key add -
	xx sudo apt-key fingerprint "${docker_apt_repository_gpg_key_fingerprint}"

	case "$(uname -m)" in
	x86_64)
		xx sudo add-apt-repository "deb [arch=amd64] ${docker_apt_repository_url} $(docker_os_release_code_name) stable"
	        ;;
	*)
		echo 1>&2 "WARNING: Cannot add apt(1) repository for docker on this platform: $(uname -m)"
	        ;;
	esac
}

install_docker_core() {
	local docker_packages_old="docker{,-compose,-doc,-registry}"
	local docker_packages_new="docker-ce"

	local g1 v1

	##

	for v1 in "$(docker_version_major)" ; do
		if [ -n "$v1" ] && [ "$(($v1 < $docker_version_major_min))" -eq 1 ] ; then
			eval "$cmd_apt_get remove -y ${docker_packages_old}"
		fi
	done

	eval "$cmd_apt_get install -y ${docker_packages_new}"

	##

	for g1 in docker ; do 
		getent group "$g1" >/dev/null 2>&1 || continue

		xx sudo usermod --append --groups "$g1" "$my_user_name"
	done

	xx docker --version || :
}

install_docker_machine() {
	local f1 f2

	for f1 in docker-machine ; do
	for f2 in /usr/local/bin/"$f1" ; do
	(
		umask 0002

		f1_tmp="$(dirname "$f2")/.tmp.$$.$(basename "$f2")"
		trap "xx rm -f '$f1_tmp'" EXIT

		xx curl -fsSL "${docker_machine_script_url}" |
		xx sudo cp /dev/stdin "$f1_tmp"
		xx sudo chmod +rx "$f1_tmp"

		xx sudo mv "$f1_tmp" "$f2"
	)
	done
	done

	xx docker-machine --version || :
}

install_docker_compose() {
	$cmd_apt_get install -y docker-compose || never_mind_optional_package
}

##

install_docker_apt_repository
xx sudo apt-get update

install_docker_core
install_docker_machine
install_docker_compose

##

if false ; then # install extra tools
$cmd_apt_get install -y python-docker{,pty}
$cmd_apt_get install -y python3-docker{,pty}

$cmd_apt_get install -y deb{ocker,ootstick}

$cmd_apt_get install -y cadvisor ctop
fi

##