get-docker.sh

#!/bin/sh
set -e
# Docker CE for Linux installation script
#
# See https://docs.docker.com/engine/install/ for the installation steps.
#
# This script is meant for quick & easy install via:
#   $ curl -fsSL https://get.docker.com -o get-docker.sh
#   $ sh get-docker.sh
#
# For test builds (ie. release candidates):
#   $ curl -fsSL https://test.docker.com -o test-docker.sh
#   $ sh test-docker.sh
#
# NOTE: Make sure to verify the contents of the script
#       you downloaded matches the contents of install.sh
#       located at https://github.com/docker/docker-install
#       before executing.
#
# Git commit from https://github.com/docker/docker-install when
# the script was uploaded (Should only be modified by upload job):
SCRIPT_COMMIT_SHA="28bc4d09b3938ea30c69407d198ee8ece52c3e12"

# strip "v" prefix if present
VERSION="${VERSION#v}"

# The channel to install from:
#   * nightly
#   * test
#   * stable
#   * edge (deprecated)
DEFAULT_CHANNEL_VALUE="stable"
if [ -z "$CHANNEL" ]; then
	CHANNEL=$DEFAULT_CHANNEL_VALUE
fi

DEFAULT_DOWNLOAD_URL="https://download.docker.com"
if [ -z "$DOWNLOAD_URL" ]; then
	DOWNLOAD_URL=$DEFAULT_DOWNLOAD_URL
fi

DEFAULT_REPO_FILE="docker-ce.repo"
if [ -z "$REPO_FILE" ]; then
	REPO_FILE="$DEFAULT_REPO_FILE"
fi

mirror=''
DRY_RUN=${DRY_RUN:-}
while [ $# -gt 0 ]; do
	case "$1" in
		--mirror)
			mirror="$2"
			shift
			;;
		--dry-run)
			DRY_RUN=1
			;;
		--*)
			echo "Illegal option $1"
			;;
	esac
	shift $(( $# > 0 ? 1 : 0 ))
done

case "$mirror" in
	Aliyun)
		DOWNLOAD_URL="https://mirrors.aliyun.com/docker-ce"
		;;
	AzureChinaCloud)
		DOWNLOAD_URL="https://mirror.azure.cn/docker-ce"
		;;
esac

command_exists() {
	command -v "$@" > /dev/null 2>&1
}

# version_gte checks if the version specified in $VERSION is at least
# the given CalVer (YY.MM) version. returns 0 (success) if $VERSION is either
# unset (=latest) or newer or equal than the specified version. Returns 1 (fail)
# otherwise.
#
# examples:
#
# VERSION=20.10
# version_gte 20.10 // 0 (success)
# version_gte 19.03 // 0 (success)
# version_gte 21.10 // 1 (fail)
version_gte() {
	if [ -z "$VERSION" ]; then
			return 0
	fi
	eval calver_compare "$VERSION" "$1"
}

# calver_compare compares two CalVer (YY.MM) version strings. returns 0 (success)
# if version A is newer or equal than version B, or 1 (fail) otherwise. Patch
# releases and pre-release (-alpha/-beta) are not taken into account
#
# examples:
#
# calver_compare 20.10 19.03 // 0 (success)
# calver_compare 20.10 20.10 // 0 (success)
# calver_compare 19.03 20.10 // 1 (fail)
calver_compare() (
	set +x

	yy_a="$(echo "$1" | cut -d'.' -f1)"
	yy_b="$(echo "$2" | cut -d'.' -f1)"
	if [ "$yy_a" -lt "$yy_b" ]; then
		return 1
	fi
	if [ "$yy_a" -gt "$yy_b" ]; then
		return 0
	fi
	mm_a="$(echo "$1" | cut -d'.' -f2)"
	mm_b="$(echo "$2" | cut -d'.' -f2)"
	if [ "${mm_a#0}" -lt "${mm_b#0}" ]; then
		return 1
	fi

	return 0
)

is_dry_run() {
	if [ -z "$DRY_RUN" ]; then
		return 1
	else
		return 0
	fi
}

is_wsl() {
	case "$(uname -r)" in
	*microsoft* ) true ;; # WSL 2
	*Microsoft* ) true ;; # WSL 1
	* ) false;;
	esac
}

is_darwin() {
	case "$(uname -s)" in
	*darwin* ) true ;;
	*Darwin* ) true ;;
	* ) false;;
	esac
}

deprecation_notice() {
	distro=$1
	distro_version=$2
	echo
	printf "\033[91;1mDEPRECATION WARNING\033[0m\n"
	printf "    This Linux distribution (\033[1m%s %s\033[0m) reached end-of-life and is no longer supported by this script.\n" "$distro" "$distro_version"
	echo   "    No updates or security fixes will be released for this distribution, and users are recommended"
	echo   "    to upgrade to a currently maintained version of $distro."
	echo
	printf   "Press \033[1mCtrl+C\033[0m now to abort this script, or wait for the installation to continue."
	echo
	sleep 10
}

get_distribution() {
	lsb_dist=""
	# Every system that we officially support has /etc/os-release
	if [ -r /etc/os-release ]; then
		lsb_dist="$(. /etc/os-release && echo "$ID")"
	fi
	# Returning an empty string here should be alright since the
	# case statements don't act unless you provide an actual value
	echo "$lsb_dist"
}

echo_docker_as_nonroot() {
	if is_dry_run; then
		return
	fi
	if command_exists docker && [ -e /var/run/docker.sock ]; then
		(
			set -x
			$sh_c 'docker version'
		) || true
	fi

	# intentionally mixed spaces and tabs here -- tabs are stripped by "<<-EOF", spaces are kept in the output
	echo
	echo "================================================================================"
	echo
	if version_gte "20.10"; then
		echo "To run Docker as a non-privileged user, consider setting up the"
		echo "Docker daemon in rootless mode for your user:"
		echo
		echo "    dockerd-rootless-setuptool.sh install"
		echo
		echo "Visit https://docs.docker.com/go/rootless/ to learn about rootless mode."
		echo
	fi
	echo
	echo "To run the Docker daemon as a fully privileged service, but granting non-root"
	echo "users access, refer to https://docs.docker.com/go/daemon-access/"
	echo
	echo "WARNING: Access to the remote API on a privileged Docker daemon is equivalent"
	echo "         to root access on the host. Refer to the 'Docker daemon attack surface'"
	echo "         documentation for details: https://docs.docker.com/go/attack-surface/"
	echo
	echo "================================================================================"
	echo
}

# Check if this is a forked Linux distro
check_forked() {

	# Check for lsb_release command existence, it usually exists in forked distros
	if command_exists lsb_release; then
		# Check if the `-u` option is supported
		set +e
		lsb_release -a -u > /dev/null 2>&1
		lsb_release_exit_code=$?
		set -e

		# Check if the command has exited successfully, it means we're in a forked distro
		if [ "$lsb_release_exit_code" = "0" ]; then
			# Print info about current distro
			cat <<-EOF
			You're using '$lsb_dist' version '$dist_version'.
			EOF

			# Get the upstream release info
			lsb_dist=$(lsb_release -a -u 2>&1 | tr '[:upper:]' '[:lower:]' | grep -E 'id' | cut -d ':' -f 2 | tr -d '[:space:]')
			dist_version=$(lsb_release -a -u 2>&1 | tr '[:upper:]' '[:lower:]' | grep -E 'codename' | cut -d ':' -f 2 | tr -d '[:space:]')

			# Print info about upstream distro
			cat <<-EOF
			Upstream release is '$lsb_dist' version '$dist_version'.
			EOF
		else
			if [ -r /etc/debian_version ] && [ "$lsb_dist" != "ubuntu" ] && [ "$lsb_dist" != "raspbian" ]; then
				if [ "$lsb_dist" = "osmc" ]; then
					# OSMC runs Raspbian
					lsb_dist=raspbian
				else
					# We're Debian and don't even know it!
					lsb_dist=debian
				fi
				dist_version="$(sed 's/\/.*//' /etc/debian_version | sed 's/\..*//')"
				case "$dist_version" in
					11)
						dist_version="bullseye"
					;;
					10)
						dist_version="buster"
					;;
					9)
						dist_version="stretch"
					;;
					8)
						dist_version="jessie"
					;;
				esac
			fi
		fi
	fi
}

do_install() {
	echo "# Executing docker install script, commit: $SCRIPT_COMMIT_SHA"

	if command_exists docker; then
		cat >&2 <<-'EOF'
			Warning: the "docker" command appears to already exist on this system.

			If you already have Docker installed, this script can cause trouble, which is
			why we're displaying this warning and provide the opportunity to cancel the
			installation.

			If you installed the current Docker package using this script and are using it
			again to update Docker, you can safely ignore this message.

			You may press Ctrl+C now to abort this script.
		EOF
		( set -x; sleep 20 )
	fi

	user="$(id -un 2>/dev/null || true)"

	sh_c='sh -c'
	if [ "$user" != 'root' ]; then
		if command_exists sudo; then
			sh_c='sudo -E sh -c'
		elif command_exists su; then
			sh_c='su -c'
		else
			cat >&2 <<-'EOF'
			Error: this installer needs the ability to run commands as root.
			We are unable to find either "sudo" or "su" available to make this happen.
			EOF
			exit 1
		fi
	fi

	if is_dry_run; then
		sh_c="echo"
	fi

	# perform some very rudimentary platform detection
	lsb_dist=$( get_distribution )
	lsb_dist="$(echo "$lsb_dist" | tr '[:upper:]' '[:lower:]')"

	if is_wsl; then
		echo
		echo "WSL DETECTED: We recommend using Docker Desktop for Windows."
		echo "Please get Docker Desktop from https://www.docker.com/products/docker-desktop"
		echo
		cat >&2 <<-'EOF'

			You may press Ctrl+C now to abort this script.
		EOF
		( set -x; sleep 20 )
	fi

	case "$lsb_dist" in

		ubuntu)
			if command_exists lsb_release; then
				dist_version="$(lsb_release --codename | cut -f2)"
			fi
			if [ -z "$dist_version" ] && [ -r /etc/lsb-release ]; then
				dist_version="$(. /etc/lsb-release && echo "$DISTRIB_CODENAME")"
			fi
		;;

		debian|raspbian)
			dist_version="$(sed 's/\/.*//' /etc/debian_version | sed 's/\..*//')"
			case "$dist_version" in
				11)
					dist_version="bullseye"
				;;
				10)
					dist_version="buster"
				;;
				9)
					dist_version="stretch"
				;;
				8)
					dist_version="jessie"
				;;
			esac
		;;

		centos|rhel)
			if [ -z "$dist_version" ] && [ -r /etc/os-release ]; then
				dist_version="$(. /etc/os-release && echo "$VERSION_ID")"
			fi
		;;

		*)
			if command_exists lsb_release; then
				dist_version="$(lsb_release --release | cut -f2)"
			fi
			if [ -z "$dist_version" ] && [ -r /etc/os-release ]; then
				dist_version="$(. /etc/os-release && echo "$VERSION_ID")"
			fi
		;;

	esac

	# Check if this is a forked Linux distro
	check_forked

	# Print deprecation warnings for distro versions that recently reached EOL,
	# but may still be commonly used (especially LTS versions).
	case "$lsb_dist.$dist_version" in
		debian.stretch|debian.jessie)
			deprecation_notice "$lsb_dist" "$dist_version"
			;;
		raspbian.stretch|raspbian.jessie)
			deprecation_notice "$lsb_dist" "$dist_version"
			;;
		ubuntu.xenial|ubuntu.trusty)
			deprecation_notice "$lsb_dist" "$dist_version"
			;;
		fedora.*)
			if [ "$dist_version" -lt 33 ]; then
				deprecation_notice "$lsb_dist" "$dist_version"
			fi
			;;
	esac

	# Run setup for each distro accordingly
	case "$lsb_dist" in
		ubuntu|debian|raspbian)
			pre_reqs="apt-transport-https ca-certificates curl"
			if ! command -v gpg > /dev/null; then
				pre_reqs="$pre_reqs gnupg"
			fi
			apt_repo="deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] $DOWNLOAD_URL/linux/$lsb_dist $dist_version $CHANNEL"
			(
				if ! is_dry_run; then
					set -x
				fi
				$sh_c 'apt-get update -qq >/dev/null'
				$sh_c "DEBIAN_FRONTEND=noninteractive apt-get install -y -qq $pre_reqs >/dev/null"
				$sh_c "curl -fsSL \"$DOWNLOAD_URL/linux/$lsb_dist/gpg\" | gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg"
				$sh_c "echo \"$apt_repo\" > /etc/apt/sources.list.d/docker.list"
				$sh_c 'apt-get update -qq >/dev/null'
			)
			pkg_version=""
			if [ -n "$VERSION" ]; then
				if is_dry_run; then
					echo "# WARNING: VERSION pinning is not supported in DRY_RUN"
				else
					# Will work for incomplete versions IE (17.12), but may not actually grab the "latest" if in the test channel
					pkg_pattern="$(echo "$VERSION" | sed "s/-ce-/~ce~.*/g" | sed "s/-/.*/g").*-0~$lsb_dist"
					search_command="apt-cache madison 'docker-ce' | grep '$pkg_pattern' | head -1 | awk '{\$1=\$1};1' | cut -d' ' -f 3"
					pkg_version="$($sh_c "$search_command")"
					echo "INFO: Searching repository for VERSION '$VERSION'"
					echo "INFO: $search_command"
					if [ -z "$pkg_version" ]; then
						echo
						echo "ERROR: '$VERSION' not found amongst apt-cache madison results"
						echo
						exit 1
					fi
					if version_gte "18.09"; then
							search_command="apt-cache madison 'docker-ce-cli' | grep '$pkg_pattern' | head -1 | awk '{\$1=\$1};1' | cut -d' ' -f 3"
							echo "INFO: $search_command"
							cli_pkg_version="=$($sh_c "$search_command")"
					fi
					pkg_version="=$pkg_version"
				fi
			fi
			(
				pkgs=""
				if version_gte "18.09"; then
						# older versions don't support a cli package
						pkgs="$pkgs docker-ce-cli${cli_pkg_version%=}"
				fi
				if version_gte "20.10" && [ "$(uname -m)" = "x86_64" ]; then
						# also install the latest version of the "docker scan" cli-plugin (only supported on x86 currently)
						pkgs="$pkgs docker-scan-plugin"
				fi
				pkgs="$pkgs docker-ce${pkg_version%=}"
				if ! is_dry_run; then
					set -x
				fi
				$sh_c "DEBIAN_FRONTEND=noninteractive apt-get install -y -qq --no-install-recommends $pkgs >/dev/null"
				if version_gte "20.10"; then
					# Install docker-ce-rootless-extras without "--no-install-recommends", so as to install slirp4netns when available
					$sh_c "DEBIAN_FRONTEND=noninteractive apt-get install -y -qq docker-ce-rootless-extras${pkg_version%=} >/dev/null"
				fi
			)
			echo_docker_as_nonroot
			exit 0
			;;
		centos|fedora|rhel)
			yum_repo="$DOWNLOAD_URL/linux/$lsb_dist/$REPO_FILE"
			if ! curl -Ifs "$yum_repo" > /dev/null; then
				echo "Error: Unable to curl repository file $yum_repo, is it valid?"
				exit 1
			fi
			if [ "$lsb_dist" = "fedora" ]; then
				pkg_manager="dnf"
				config_manager="dnf config-manager"
				enable_channel_flag="--set-enabled"
				disable_channel_flag="--set-disabled"
				pre_reqs="dnf-plugins-core"
				pkg_suffix="fc$dist_version"
			else
				pkg_manager="yum"
				config_manager="yum-config-manager"
				enable_channel_flag="--enable"
				disable_channel_flag="--disable"
				pre_reqs="yum-utils"
				pkg_suffix="el"
			fi
			(
				if ! is_dry_run; then
					set -x
				fi
				$sh_c "$pkg_manager install -y -q $pre_reqs"
				$sh_c "$config_manager --add-repo $yum_repo"

				if [ "$CHANNEL" != "stable" ]; then
					$sh_c "$config_manager $disable_channel_flag docker-ce-*"
					$sh_c "$config_manager $enable_channel_flag docker-ce-$CHANNEL"
				fi
				$sh_c "$pkg_manager makecache"
			)
			pkg_version=""
			if [ -n "$VERSION" ]; then
				if is_dry_run; then
					echo "# WARNING: VERSION pinning is not supported in DRY_RUN"
				else
					pkg_pattern="$(echo "$VERSION" | sed "s/-ce-/\\\\.ce.*/g" | sed "s/-/.*/g").*$pkg_suffix"
					search_command="$pkg_manager list --showduplicates 'docker-ce' | grep '$pkg_pattern' | tail -1 | awk '{print \$2}'"
					pkg_version="$($sh_c "$search_command")"
					echo "INFO: Searching repository for VERSION '$VERSION'"
					echo "INFO: $search_command"
					if [ -z "$pkg_version" ]; then
						echo
						echo "ERROR: '$VERSION' not found amongst $pkg_manager list results"
						echo
						exit 1
					fi
					if version_gte "18.09"; then
						# older versions don't support a cli package
						search_command="$pkg_manager list --showduplicates 'docker-ce-cli' | grep '$pkg_pattern' | tail -1 | awk '{print \$2}'"
						cli_pkg_version="$($sh_c "$search_command" | cut -d':' -f 2)"
					fi
					# Cut out the epoch and prefix with a '-'
					pkg_version="-$(echo "$pkg_version" | cut -d':' -f 2)"
				fi
			fi
			(
				if ! is_dry_run; then
					set -x
				fi
				# install the correct cli version first
				if [ -n "$cli_pkg_version" ]; then
					$sh_c "$pkg_manager install -y -q docker-ce-cli-$cli_pkg_version"
				fi
				$sh_c "$pkg_manager install -y -q docker-ce$pkg_version"
				if version_gte "20.10"; then
					$sh_c "$pkg_manager install -y -q docker-ce-rootless-extras$pkg_version"
				fi
			)
			echo_docker_as_nonroot
			exit 0
			;;
		*)
			if [ -z "$lsb_dist" ]; then
				if is_darwin; then
					echo
					echo "ERROR: Unsupported operating system 'macOS'"
					echo "Please get Docker Desktop from https://www.docker.com/products/docker-desktop"
					echo
					exit 1
				fi
			fi
			echo
			echo "ERROR: Unsupported distribution '$lsb_dist'"
			echo
			exit 1
			;;
	esac
	exit 1
}

# wrapped up in a function so that we have some protection against only getting
# half the file during "curl | sh"
do_install