#!/bin/bash
# Author: Yann Autissier <yann.autissier@gmail.com>

DOCKER_IMAGE_REPOSITORY="centile"
DOCKER_BUILD_DIRECTORY="/etc/docker"

usage() {
    echo Usage: $0 [ -c cluster] [ -i image ] [-f] [-q] [-t] name [name [...]]
    echo -e "Run a docker from an image in the '${DOCKER_IMAGE_REPOSITORY}' repository."
    echo  
    echo -e "name\t is a directory with a Dockerfile, default in '${DOCKER_BUILD_DIRECTORY}/name'."
    echo -e "\t'name' can contains a dash. The directory name will be extracted for the first part"
    echo -e "\tbefore a dash."
    echo
    echo -e "Options:"
    echo -e "\t-c 'cluster'\tAllow to override files in 'image' directory with existing files in"
    echo -e "\t\t\tthe 'image/cluster' directory."
    echo -e "\t -i 'image'\tthe docker image to run, default in '${DOCKER_IMAGE_REPOSITORY}' repository."
    echo -e "\t -f\t\tforce run, stop and remove existing docker before running a new one."
    echo -e "\t -q\t\tquiet mode, minimal output."
    echo -e "\t -t\t\ttest mode, do nothing but output the command that would have been launched."
    echo
    echo -e "EXAMPLES"
    echo 
    echo -e "$0 elk"
    echo -e "Run a docker named 'elk' from the '${DOCKER_IMAGE_REPOSITORY}/elk' image"
    echo 
    echo -e "$0 elk-es01"
    echo -e "Run a docker named 'elk-es01' from the '${DOCKER_IMAGE_REPOSITORY}/elk-es01' image"
    echo 
    echo -e "$0 -i elk elk-es01"
    echo -e "Run a docker named 'elk-es01' from the '${DOCKER_IMAGE_REPOSITORY}/elk' image"
    echo 
    exit 1
}

while [ $# -gt 0 ]; do
    case $1 in
        -c|--cluster) shift && CLUSTER="$1"
        ;;
        -i|--image) shift && IMAGE="$1"
        ;;
        -h|--help) usage
        ;;
        -f|--force) FORCE=1
        ;;
        -q|--quiet) QUIET=1
        ;;
        -t|--test) TEST=1
        ;;
        *) args="${args:-} $1"
    esac
    shift
    args="${args# }"
done

# check args
[ "${args:0:1}" = "-" ] && usage

for arg in ${args}; do
    # reset vars
    image=""; DOCKER_OPT=""
    # extract docker name
    name="$(basename ${arg})"
    # keep part before the dash as the directory name
    dir="$(dirname ${arg})/${name%-*}"
    # keep part after the dash as an image suffix name
    [ "${name##*-}" != "${name}" ] && suffix="${name##*-}"
    # if provided, set docker image from args
    if [ -n "${IMAGE}" ]; then
        # if docker image does not contain a /, add our default repository
        [ "${IMAGE##*/}" != "${IMAGE}" ] && image="${IMAGE}" || image="${DOCKER_IMAGE_REPOSITORY}/${IMAGE}"
    # else try to find an image from the docker name
    else
        # try docker name, docker name without ending numbers, docker name without suffix
        for image in ${name} ${name%%[0-9]*} ${name%-*}; do
            # search for image in ${DOCKER_IMAGE_REPOSITORY}
            [ -n "$(docker images 2>/dev/null |awk '$1 == "'${DOCKER_IMAGE_REPOSITORY}/${image}'" {print $1}')" ] && image="${DOCKER_IMAGE_REPOSITORY}/${image}" && break
            image="${name}"
        done
    fi

    tag="$(docker images |awk '$1 == "'${image}'" {print $2}')"
    [ -z "${tag}" ] && echo "ERROR: Cannot find image '${image}'" >2 && exit 2

    # default to ${DOCKER_BUILD_DIRECTORY}/${dir} if ${dir} does not exists
    [ ! -d "${dir}" ] && [ -d "${DOCKER_BUILD_DIRECTORY}/${dir}" ] && dir="${DOCKER_BUILD_DIRECTORY}/${dir#./}"

    # directory exists && contains a Dockerfile
    [ -d ${dir} ] && [ -f "${dir}/Dockerfile" ] || usage
    # cluster directory exists
    [ -n "${CLUSTER}" ] && { [ -d ${dir}/${CLUSTER} ] || usage; }

    # search for Dockeropts files
    files="${dir}/Dockeropts ${dir}/Dockeropts-${suffix}"
    [ -n "${CLUSTER}" ] && files="${files} ${dir}/${CLUSTER}/Dockeropts ${dir}/${CLUSTER}/Dockeropts-${suffix}"

    # source the Dockeropts files
    for dockeropts in ${files}; do
        [ -f "${dockeropts}" ] && . ${dockeropts}
    done

    # extract SYSCTL
    [ -n "${SYSCTL}" ] && for sysctl in ${SYSCTL}; do
        sysctl -w ${sysctl} 2>/dev/null
    done

    # extract DOCKER_OPT
    [ -n "${DOCKER_OPT}" ] && DOCKER_OPTS="--${DOCKER_OPT/ / --}" || DOCKER_OPTS=""

    # extract DOCKER_ENV
    [ -n "${DOCKER_ENV}" ] && DOCKER_OPTS="${DOCKER_OPTS} -e ${DOCKER_ENV//\" /\" -e }"

    # extract DOCKER_LINK
    [ -n "${DOCKER_LINK}" ] && DOCKER_OPTS="--link ${DOCKER_LINK/ / --link }"

    # extract DOCKER_PORT
    [ -n "${DOCKER_PORT}" ] && DOCKER_OPTS="${DOCKER_OPTS} -p ${DOCKER_PORT// / -p }"

    # extract DOCKER_ULIMIT
    [ -n "${DOCKER_ULIMIT}" ] && DOCKER_OPTS="${DOCKER_OPTS} --ulimit ${DOCKER_ULIMIT// / --ulimit }"

    # extract DOCKER_VOLUME
    [ -n "${DOCKER_VOLUME}" ] && DOCKER_OPTS="${DOCKER_OPTS} -v ${DOCKER_VOLUME// / -v }"

    # enable access to host volumes on selinux
    for volume in ${HOST_VOLUME}; do
        chcon -Rt svirt_sandbox_file_t ${volume} 2>/dev/null
    done

    # remove current docker
    if [ ${FORCE} ]; then
	if [ -n "$(docker ps -q --filter status=created,status=restarting,status=running,status=paused,status=exited,status=dead,name=${name})" ]; then
            [ ! ${QUIET} ] && echo -n "Removing docker ${name}... "
            if [ ${TEST} ]; then
                echo docker rm -f ${name}
            else
                eval docker rm -f ${name} >/dev/null 2>&1
                result=$? && [ ${result} -ne 0 ] && echo "ERROR" && { [ ${result:-0} -ge ${return:-0} ] && return=${result}; } && break
		[ ! ${QUIET} ] && echo "OK"
            fi
        fi
    fi

    # launch docker
    [ ${QUIET} ] && [ ! ${TEST} ] && echo -n "${name} "
    [ ! ${QUIET} ] && echo -n "Running docker ${name}... "
    if [ ${TEST} ]; then
        echo docker run --restart=always ${DOCKER_OPTS} -d --name ${name} ${image} ${DOCKER_RUN:-}
    else
        eval docker run --restart=always ${DOCKER_OPTS} -d --name ${name} ${image} ${DOCKER_RUN:-} 2>/dev/null
        result=$? && [ ${result} -ne 0 ] && echo "ERROR"
    fi
    [ ${result:-0} -ge ${return:-0} ] && return=${result}
done

exit ${return:-1}