start

#!/bin/bash

SUDO=
declare -a ARGS=()
IMAGE=postgis12-python
NAME="$IMAGE"
DATA_DIR=
POSTGRES_USER=postgres
POSTGRES_PASSWORD=mysecretpassword
DOCKER_DATA_DIR=/var/lib/postgresql/data
POSTGRES_IP=127.0.0.1
POSTGRES_PORT=5432

USAGE="$(cat <<EOF
usage: $0 [-n <name>] [-d <directory>] [-h <ip>] [-p <port>] [-P <password>]

optional arguments:
  -n <name>       set docker container name (default: ${NAME})
  -d <directory>  set data directory (default: \${HOME}/.postgres/<name>)
  -h <ip>         set postgres ip (default: ${POSTGRES_IP})
  -p <port>       set postgres port (default: ${POSTGRES_PORT})
  -P <password>   set postgres user password (default: ${POSTGRES_PASSWORD})
EOF
)"

( id -Gn | grep -q docker ) || SUDO=sudo

parse_args() {
    local OPTIND OPTARG OPT
    while getopts "n:h:p:P:" OPT; do
        case "$OPT" in
            n) NAME="${OPTARG}";;
			d) DATA_DIR="${OPTARG}";;
			h) POSTGRES_IP="${OPTARG}";;
			p) POSTGRES_PORT="${OPTARG}";;
			P) POSTGRES_PASSWORD="${OPTARG}";;
            *)
                echo "$USAGE" >&2
				exit 1
                ;;
        esac
    done
    shift $((OPTIND-1))
	[[ -z $DATA_DIR ]] && DATA_DIR="${HOME}/.postgres/${NAME}"
}

find_stopped_instances() {
	echo "finding stopped instances..." >&2
	for c in $(${SUDO} docker ps -a -q --filter ancestor="$IMAGE" --filter name="$NAME"); do
		running="$(${SUDO} docker inspect -f {{.State.Running}} ${c})"
		if [[ $running == true ]]; then
			echo "${c} is already running" >&2
			exit
		else
			echo "restarting ${c}..." >&2
			exec ${SUDO} docker start "${c}"
		fi
	done
}

prepare_docker_parameters() {
	if [[ ! -d $DATA_DIR ]]; then
		mkdir -pv "$DATA_DIR" && chmod 755 "$DATA_DIR" || exit 1
	fi

	ARGS+=("--publish=${POSTGRES_IP}:${POSTGRES_PORT}:5432")

	ARGS+=("--env=POSTGRES_PASSWORD=${POSTGRES_PASSWORD}")
	ARGS+=("--env=PGDATA=${DOCKER_DATA_DIR}")

	ARGS+=("--volume=${DATA_DIR}:${DOCKER_DATA_DIR}")
}

parse_args "$@"
find_stopped_instances
prepare_docker_parameters

echo "starting ${IMAGE}..."
${SUDO} docker run -d "${ARGS[@]}" --name "$NAME" "$IMAGE" "$@"