#!/bin/sh
set -e
#
# This script is meant for quick & easy install via:
#   'curl -sSL https://get.docker.com/ | sh'
# or:
#   'wget -qO- https://get.docker.com/ | sh'
#
# For test builds (ie. release candidates):
#   'curl -fsSL https://test.docker.com/ | sh'
# or:
#   'wget -qO- https://test.docker.com/ | sh'
#
# For experimental builds:
#   'curl -fsSL https://experimental.docker.com/ | sh'
# or:
#   'wget -qO- https://experimental.docker.com/ | sh'
#
# Docker Maintainers:
#   To update this script on https://get.docker.com,
#   use hack/release.sh during a normal release,
#   or the following one-liner for script hotfixes:
#     s3cmd put --acl-public -P hack/install.sh s3://get.docker.com/index
#

url="https://get.docker.com/"
apt_url="https://apt.dockerproject.org"
yum_url="https://yum.dockerproject.org"
gpg_fingerprint="58118E89F3A912897C070ADBF76221572C52609D"

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

echo_docker_as_nonroot() {
	if command_exists docker && [ -e /var/run/docker.sock ]; then
		(
			set -x
			$sh_c 'docker version'
		) || true
	fi
	your_user=your-user
	[ "$user" != 'root' ] && your_user="$user"
	# intentionally mixed spaces and tabs here -- tabs are stripped by "<<-EOF", spaces are kept in the output
	cat <<-EOF

	If you would like to use Docker as a non-root user, you should now consider
	adding your user to the "docker" group with something like:

	  sudo usermod -aG docker $your_user

	Remember that you will have to log out and back in for this to take effect!

	EOF
}

# 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 ] && [ "$lsb_dist" != "ubuntu" ]; then
				# We're Debian and don't even know it!
				lsb_dist=debian
				dist_version="$(cat /etc/debian_version | sed 's/\/.*//' | sed 's/\..*//')"
				case "$dist_version" in
					8|'Kali Linux 2')
						dist_version="jessie"
					;;
					7)
						dist_version="wheezy"
					;;
				esac
			fi
		fi
	fi
}

rpm_import_repository_key() {
	local key=$1; shift
	local tmpdir=$(mktemp -d)
	chmod 600 "$tmpdir"
	gpg --homedir "$tmpdir" --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"
	gpg --homedir "$tmpdir" --export --armor "$key" > "$tmpdir"/repo.key
	rpm --import "$tmpdir"/repo.key
	rm -rf "$tmpdir"
}

semverParse() {
	major="${1%%.*}"
	minor="${1#$major.}"
	minor="${minor%%.*}"
	patch="${1#$major.$minor.}"
	patch="${patch%%[-.]*}"
}

do_install() {
	case "$(uname -m)" in
		*64)
			;;
		*)
			cat >&2 <<-'EOF'
			Error: you are not using a 64bit platform.
			Docker currently only supports 64bit platforms.
			EOF
			exit 1
			;;
	esac

	if command_exists docker; then
		version="$(docker -v | awk -F '[ ,]+' '{ print $3 }')"
		MAJOR_W=1
		MINOR_W=10

		semverParse $version

		shouldWarn=0
		if [ $major -lt $MAJOR_W ]; then
			shouldWarn=1
		fi

		if [ $major -le $MAJOR_W ] && [ $minor -lt $MINOR_W ]; then
			shouldWarn=1
		fi

		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
		EOF

		if [ $shouldWarn -eq 1 ]; then
			cat >&2 <<-'EOF'
			again to update Docker, we urge you to migrate your image store before upgrading
			to v1.10+.

			You can find instructions for this here:
			https://github.com/docker/docker/wiki/Engine-v1.10.0-content-addressability-migration
			EOF
		else
			cat >&2 <<-'EOF'
			again to update Docker, you can safely ignore this message.
			EOF
		fi

		cat >&2 <<-'EOF'

			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

	curl=''
	if command_exists curl; then
		curl='curl -sSL'
	elif command_exists wget; then
		curl='wget -qO-'
	elif command_exists busybox && busybox --list-modules | grep -q wget; then
		curl='busybox wget -qO-'
	fi

	# check to see which repo they are trying to install from
	if [ -z "$repo" ]; then
		repo='main'
		if [ "https://test.docker.com/" = "$url" ]; then
			repo='testing'
		elif [ "https://experimental.docker.com/" = "$url" ]; then
			repo='experimental'
		fi
	fi

	# perform some very rudimentary platform detection
	lsb_dist=''
	dist_version=''
	if command_exists lsb_release; then
		lsb_dist="$(lsb_release -si)"
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/lsb-release ]; then
		lsb_dist="$(. /etc/lsb-release && echo "$DISTRIB_ID")"
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/debian_version ]; then
		lsb_dist='debian'
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/fedora-release ]; then
		lsb_dist='fedora'
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/oracle-release ]; then
		lsb_dist='oracleserver'
	fi
	if [ -z "$lsb_dist" ]; then
		if [ -r /etc/centos-release ] || [ -r /etc/redhat-release ]; then
			lsb_dist='centos'
		fi
	fi
	if [ -z "$lsb_dist" ] && [ -r /etc/os-release ]; then
		lsb_dist="$(. /etc/os-release && echo "$ID")"
	fi

	lsb_dist="$(echo "$lsb_dist" | tr '[:upper:]' '[:lower:]')"

	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)
			dist_version="$(cat /etc/debian_version | sed 's/\/.*//' | sed 's/\..*//')"
			case "$dist_version" in
				8)
					dist_version="jessie"
				;;
				7)
					dist_version="wheezy"
				;;
			esac
		;;

		oracleserver)
			# need to switch lsb_dist to match yum repo URL
			lsb_dist="oraclelinux"
			dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//' | sed 's/Server*//')"
		;;

		fedora|centos)
			dist_version="$(rpm -q --whatprovides redhat-release --queryformat "%{VERSION}\n" | sed 's/\/.*//' | sed 's/\..*//' | sed 's/Server*//')"
		;;

		*)
			if command_exists lsb_release; then
				dist_version="$(lsb_release --codename | cut -f2)"
			fi
			if [ -z "$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

	# Run setup for each distro accordingly
	case "$lsb_dist" in
		amzn)
			(
			set -x
			$sh_c 'sleep 3; yum -y -q install docker'
			)
			echo_docker_as_nonroot
			exit 0
			;;

		'opensuse project'|opensuse)
			echo 'Going to perform the following operations:'
			if [ "$repo" != 'main' ]; then
				echo '  * add repository obs://Virtualization:containers'
			fi
			echo '  * install Docker'
			$sh_c 'echo "Press CTRL-C to abort"; sleep 3'

			if [ "$repo" != 'main' ]; then
				# install experimental packages from OBS://Virtualization:containers
				(
					set -x
					zypper -n ar -f obs://Virtualization:containers Virtualization:containers
					rpm_import_repository_key 55A0B34D49501BB7CA474F5AA193FBB572174FC2
				)
			fi
			(
				set -x
				zypper -n install docker
			)
			echo_docker_as_nonroot
			exit 0
			;;
		'suse linux'|sle[sd])
			echo 'Going to perform the following operations:'
			if [ "$repo" != 'main' ]; then
				echo '  * add repository obs://Virtualization:containers'
				echo '  * install experimental Docker using packages NOT supported by SUSE'
			else
				echo '  * add the "Containers" module'
				echo '  * install Docker using packages supported by SUSE'
			fi
			$sh_c 'echo "Press CTRL-C to abort"; sleep 3'

			if [ "$repo" != 'main' ]; then
				# install experimental packages from OBS://Virtualization:containers
				echo >&2 'Warning: installing experimental packages from OBS, these packages are NOT supported by SUSE'
				(
					set -x
					zypper -n ar -f obs://Virtualization:containers/SLE_12 Virtualization:containers
					rpm_import_repository_key 55A0B34D49501BB7CA474F5AA193FBB572174FC2
				)
			else
				# Add the containers module
				# Note well-1: the SLE machine must already be registered against SUSE Customer Center
				# Note well-2: the `-r ""` is required to workaround a known issue of SUSEConnect
				(
					set -x
					SUSEConnect -p sle-module-containers/12/x86_64 -r ""
				)
			fi
			(
				set -x
				zypper -n install docker
			)
			echo_docker_as_nonroot
			exit 0
			;;

		ubuntu|debian)
			export DEBIAN_FRONTEND=noninteractive

			did_apt_get_update=
			apt_get_update() {
				if [ -z "$did_apt_get_update" ]; then
					( set -x; $sh_c 'sleep 3; apt-get update' )
					did_apt_get_update=1
				fi
			}

			# aufs is preferred over devicemapper; try to ensure the driver is available.
			if ! grep -q aufs /proc/filesystems && ! $sh_c 'modprobe aufs'; then
				if uname -r | grep -q -- '-generic' && dpkg -l 'linux-image-*-generic' | grep -q '^ii' 2>/dev/null; then
					kern_extras="linux-image-extra-$(uname -r) linux-image-extra-virtual"

					apt_get_update
					( set -x; $sh_c 'sleep 3; apt-get install -y -q '"$kern_extras" ) || true

					if ! grep -q aufs /proc/filesystems && ! $sh_c 'modprobe aufs'; then
						echo >&2 'Warning: tried to install '"$kern_extras"' (for AUFS)'
						echo >&2 ' but we still have no AUFS.  Docker may not work. Proceeding anyways!'
						( set -x; sleep 10 )
					fi
				else
					echo >&2 'Warning: current kernel is not supported by the linux-image-extra-virtual'
					echo >&2 ' package.  We have no AUFS support.  Consider installing the packages'
					echo >&2 ' linux-image-virtual kernel and linux-image-extra-virtual for AUFS support.'
					( set -x; sleep 10 )
				fi
			fi

			# install apparmor utils if they're missing and apparmor is enabled in the kernel
			# otherwise Docker will fail to start
			if [ "$(cat /sys/module/apparmor/parameters/enabled 2>/dev/null)" = 'Y' ]; then
				if command -v apparmor_parser >/dev/null 2>&1; then
					echo 'apparmor is enabled in the kernel and apparmor utils were already installed'
				else
					echo 'apparmor is enabled in the kernel, but apparmor_parser missing'
					apt_get_update
					( set -x; $sh_c 'sleep 3; apt-get install -y -q apparmor' )
				fi
			fi

			if [ ! -e /usr/lib/apt/methods/https ]; then
				apt_get_update
				( set -x; $sh_c 'sleep 3; apt-get install -y -q apt-transport-https ca-certificates' )
			fi
			if [ -z "$curl" ]; then
				apt_get_update
				( set -x; $sh_c 'sleep 3; apt-get install -y -q curl ca-certificates' )
				curl='curl -sSL'
			fi
			(
			set -x
			$sh_c "apt-key adv --keyserver hkp://pool.sks-keyservers.net:80 --recv-keys ${gpg_fingerprint}"
			$sh_c "mkdir -p /etc/apt/sources.list.d"
			$sh_c "echo deb [arch=$(dpkg --print-architecture)] ${apt_url}/repo ${lsb_dist}-${dist_version} ${repo} > /etc/apt/sources.list.d/docker.list"
			$sh_c 'sleep 3; apt-get update; apt-get install -y -q docker-engine'
			)
			echo_docker_as_nonroot
			exit 0
			;;

		fedora|centos|oraclelinux)
			$sh_c "cat >/etc/yum.repos.d/docker-${repo}.repo" <<-EOF
			[docker-${repo}-repo]
			name=Docker ${repo} Repository
			baseurl=${yum_url}/repo/${repo}/${lsb_dist}/${dist_version}
			enabled=1
			gpgcheck=1
			gpgkey=${yum_url}/gpg
			EOF
			if [ "$lsb_dist" = "fedora" ] && [ "$dist_version" -ge "22" ]; then
				(
					set -x
					$sh_c 'sleep 3; dnf -y -q install docker-engine'
				)
			else
				(
					set -x
					$sh_c 'sleep 3; yum -y -q install docker-engine'
				)
			fi
			echo_docker_as_nonroot
			exit 0
			;;
		gentoo)
			if [ "$url" = "https://test.docker.com/" ]; then
				# intentionally mixed spaces and tabs here -- tabs are stripped by "<<-'EOF'", spaces are kept in the output
				cat >&2 <<-'EOF'

				  You appear to be trying to install the latest nightly build in Gentoo.'
				  The portage tree should contain the latest stable release of Docker, but'
				  if you want something more recent, you can always use the live ebuild'
				  provided in the "docker" overlay available via layman.  For more'
				  instructions, please see the following URL:'

				    https://github.com/tianon/docker-overlay#using-this-overlay'

				  After adding the "docker" overlay, you should be able to:'

				    emerge -av =app-emulation/docker-9999'

				EOF
				exit 1
			fi

			(
				set -x
				$sh_c 'sleep 3; emerge app-emulation/docker'
			)
			exit 0
			;;
	esac

	# intentionally mixed spaces and tabs here -- tabs are stripped by "<<-'EOF'", spaces are kept in the output
	cat >&2 <<-'EOF'

	  Either your platform is not easily detectable, is not supported by this
	  installer script (yet - PRs welcome! [hack/install.sh]), or does not yet have
	  a package for Docker.  Please visit the following URL for more detailed
	  installation instructions:

	    https://docs.docker.com/engine/installation/

	EOF
	exit 1
}

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