70-docker-in-docker

#!/bin/bash
#
# Univention Container Mode - DinD ( Docker in Docker )
#
# Copyright 2020-2021 Univention GmbH
#
# http://www.univention.de/
#
# All rights reserved.
#
# The source code of this program is made available
# under the terms of the GNU Affero General Public License version 3
# (GNU AGPL V3) as published by the Free Software Foundation.
#
# Binary versions of this program provided by Univention to you as
# well as other copyrighted, protected or trademarked materials like
# Logos, graphics, fonts, specific documentations and configurations,
# cryptographic keys etc. are subject to a license agreement between
# you and Univention and not subject to the GNU AGPL V3.
#
# In the case you use this program under the terms of the GNU AGPL V3,
# the program is provided in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public
# License with the Debian GNU/Linux or Univention distribution in file
# /usr/share/common-licenses/AGPL-3; if not, see
# <http://www.gnu.org/licenses/>.

## util(s)
source /usr/lib/univention-container-mode/utils.sh || exit 1

## function(s)
function units() { # units: (systemctl ${stat[@]})
	local sockets=(docker)
	local services=(containerd docker)

	for stat in ${@}; do
		for socket in ${sockets[@]}; do systemctl ${stat} -- ${socket}.socket >/dev/null 2>&1 || continue; done
		for service in ${services[@]}; do systemctl ${stat} -- ${service}.service >/dev/null 2>&1 || continue; done
	done

}

## ucr shell
# eval "$(ucr shell hostname domainname)"

## declare
declare -a ucrchanges
# ucrchanges+=("key=value")
declare -a ucrremoves
# ucrremoves+=("key")

declare -A ucrcounter
# ucrcounter[<STRING>]=<INT>

declare -A ucrcommit
# ucrcommit+=/<PATH>/<FILE> OR ucrcommit[<FILE>]=/<PATH>/<FILE>

debug "### START SCRIPT($(pwd)/$0) ###"
## DinD for container mode environment
#
mountpoint --quiet /var/lib/docker >/dev/null 2>&1 && { # DinD YES/NO ?
	# don't clean on restore/recreate
	echo ${0} | egrep --quiet -- recreate ||
		rm -rfv /var/lib/docker/* /var/lib/containerd/*

	BashCompletion=/etc/bash_completion.d

	# enable appcenter/docker
	ucr set appcenter/docker=enabled

	# unmask/enable/start socket and service unit(s)
	units unmask enable start

	docker version >/dev/null 2>&1 && { # DinD YES
		ucrchanges+=("docker/daemon/default/opts/bip=172.31.31.1/16")
		ucrchanges+=("appcenter/docker/compose/network=172.30.30.1/16")

		[[ -d ${BashCompletion} ]] && {
			command -v docker >/dev/null 2>&1 && {
				curl \
					--location https://raw.githubusercontent.com/docker/docker-ce/$(docker version --format '{{.Server.Version}}' | grep -Po "\d+\.\d+")/components/cli/contrib/completion/bash/docker \
					--silent --output /dev/null --fail &&
					curl \
						--location https://raw.githubusercontent.com/docker/docker-ce/$(docker version --format '{{.Server.Version}}' | grep -Po "\d+\.\d+")/components/cli/contrib/completion/bash/docker \
						--silent --output ${BashCompletion}/docker
			}
			command -v docker-compose >/dev/null 2>&1 && {
				curl \
					--location https://raw.githubusercontent.com/docker/compose/$(docker-compose version --short)/contrib/completion/bash/docker-compose \
					--silent --output /dev/null --fail &&
					curl \
						--location https://raw.githubusercontent.com/docker/compose/$(docker-compose version --short)/contrib/completion/bash/docker-compose \
						--silent --output ${BashCompletion}/docker-compose
			}
		}
		units restart
	}

	docker version >/dev/null 2>&1 || { # DinD NO
		ucrchanges+=("appcenter/docker=false")
		units stop disable mask reset-failed
	}

}
#
## DinD for container mode environment
debug "### STOPP SCRIPT($(pwd)/$0) ###"

## ucr removes
UniventionConfigRegistryUnSet ${ucrremoves[@]}

## ucr changes
UniventionConfigRegistrySet ${ucrchanges[@]}

## ucr commit
UniventionConfigCommit ${ucrcommit[@]}

## cleanup
unset \
	ucrchanges ucrremoves ucrcounter ucrcommit

debug "### CLEAN SCRIPT($(pwd)/$0) ###"