Add config file

set -eu

declare -r CONFIG_BASE=/etc/gitlab-runner

declare -r CONFIG_FILE=${CONFIG_BASE}/registration.conf

test -e ${CONFIG_FILE} &&

	source ${CONFIG_FILE}

usage() {

	cat <<-END

	Usage: $0 [-h] [-d DESCRIPTION] [-u COORDINATOR] NAME TOKEN

	Usage: $0 [-h] [-d DESCRIPTION] [-u COORDINATOR] TOKEN [NAME]

	Options:

	  -h --help         Print this message and exit

	  -d --description  A description for the GitLab UI (defaults to NAME)

	Arguments:

	  NAME   An instance name to identify this runner

	  TOKEN  A registration token provided by the co-ordinator (GitLab) instance

	  NAME   An instance name to identify this runner.

	         Defaults to "${HOSTNAME}/%02i" where "%i" is an auto-generated

	         index.

	END

}

trap '{ echo; usage; } >&2' EXIT

set -- "${ARGS[@]}"

: ${NAME:=${1? An instance name is required}} \

  ${TOKEN:=${2? A registration token is required}} \

  ${DESCRIPTION:=${NAME}} \

  ${COORDINATOR_URL:=https://code.kodo.org.uk/} \

: ${TOKEN:=${1? A registration token is required}} \

  ${NAME:=${2-${HOSTNAME}/%i}} \

  ${COORDINATOR_URL? Need COORDINATOR_URL in configs or environment, or --url} \

shift 2

if [[ $# -eq 0 ]]; then

	echo >&2 "Unknown arguments: $*"

fi

trap - EXIT

UNIT=$(systemd-escape -m gitlab-runner@${NAME})

DIR=${UNIT%.service}

DIR=${DIR#gitlab-runner@}.d

mkdir -p --mode=0750 ${CONFIG_BASE}

set_name() {

	local name=$(printf "${NAME}" ${1-})

	DEFAULT_DESCRIPTION=${name}

	SYSTEMD_UNIT=$(systemd-escape -m gitlab-runner@${name})

	name=${SYSTEMD_UNIT%.service}

	RUNNER_CONFIG=${CONFIG_BASE}/${name#gitlab-runner@}.d

}

find_name() {

	local index=0

	if [[ $(printf "${NAME}" 1) = $(printf "${NAME}" 2) ]]; then

		# No formatting marks in NAME

		set_name

		if [[ -e ${RUNNER_CONFIG} ]]; then

			echo >&2 "Config already exists: ${RUNNER_CONFIG}"

			echo >&2 "(with name: ${NAME})"

			exit 1

		fi

		return

	fi

	while let "++index <= ${MAX_INDEX-99}" && set_name $index; do

		[[ -e ${RUNNER_CONFIG} ]] || return 0

	done

	echo >&2 "No free config slots found with ${NAME}"

	exit 1

}

find_name

docker run --rm -t -i -v /etc/gitlab-runner/${DIR}:/etc/gitlab-runner \

docker run --rm -t -i -v ${RUNNER_CONFIG}:/etc/gitlab-runner \

	gitlab/gitlab-runner register \

	--non-interactive \

	--url ${COORDINATOR_URL} \

	--registration-token ${TOKEN} \

	--description ${NAME} \

	--description ${DESCRIPTION-$DEFAULT_DESCRIPTION} \

	--executor docker \

	--docker-image docker:stable \

	--docker-privileged=true \

	--run-untagged=true \

	--locked=false

systemctl enable ${UNIT}

systemctl start ${UNIT}

systemctl enable ${SYSTEMD_UNIT}

systemctl start ${SYSTEMD_UNIT}