setup nginx-rtmp in docker/systemd

docker-nginx-rtmp.sh

#!/usr/bin/env bash

SELF=${0##*/} SDIR=${0%/*}
########################################################################################################################
: '
 The MIT License (MIT)

 Copyright © 2018 by John Celoria.

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all
 copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.

'
######################################################## config ########################################################
# Set some defaults
VERSION=0.1

DEFAULT_CONTAINER_NAME="nginx-rtmp"
DEFAULT_CONTAINER_REPO="alfg/nginx-rtmp"

DEFAULT_DATA_DIR="/opt/data"

DEFAULT_NGINX_CONF='https://raw.githubusercontent.com/alfg/docker-nginx-rtmp/master/nginx.conf'
####################################################### functions ######################################################
# Print usage information
function help() {
cat << EOF
Usage: ${SELF} [OPTION]...
Setup nginx-rtmp using Docker

  -h    Display this help message and exit
  -q    Quiet output

EOF
    return
}
########################################################################################################################
# Logging function
function log() {
    local level levels=(notice warning crit)
    level="+($(IFS='|';echo "${levels[*]}"))"

    shopt -s extglob; case ${1} in
        ${level}) level=${1}; shift ;;
        *) level=notice ;;
    esac; shopt -u extglob

    [[ -z ${RETVAL} ]] && { for RETVAL in "${!levels[@]}"; do
        [[ ${levels[${RETVAL}]} = "${level}" ]] && break
    done }

    logger -s -p ${level} -t "[${SELF}:${FUNCNAME[1]}()]" -- $@;
}
########################################################################################################################
# Log and then exit
function die() { local retval=${RETVAL:-$?}; log "$@"; exit ${retval}; }
########################################################################################################################
# Sanity checks
while getopts ":hq" opt; do
    case ${opt} in
        h)  help >&2; exit 1                                            ;;
        q)  QUIET=1                                                     ;;
        \?) echo "Invalid option: -${OPTARG}" >&2                       ;;
        :)  echo "Option -${OPTARG} requires an argument." >&2; exit 1  ;;
    esac
done; shift $((${OPTIND} - 1))

req_progs=(logger)
for p in ${req_progs[@]}; do
    hash "${p}" 2>&- || \
    { die "Required program \"${p}\" not found in \${PATH}."; }
done
######################################################### main #########################################################

function main() {
    [[ ${QUIET:-0} -eq 1 ]] && exec >${LOGFILE:-/dev/null} 2>&1

    # Use sudo if we're not root
    [[ ${USER} != "root" ]] && SUDO="$(type -P sudo) -i"

    # confirm options
    read -p "What do you want to name this container? [${DEFAULT_CONTAINER_NAME}]: " CONTAINER_NAME
    CONTAINER_NAME=${CONTAINER_NAME:-${DEFAULT_CONTAINER_NAME}}
    read -p "Which docker repository are we pulling from? [${DEFAULT_CONTAINER_REPO}]: " CONTAINER_REPO
    CONTAINER_REPO=${CONTAINER_REPO:-${DEFAULT_CONTAINER_REPO}}
    read -p "The local path to the data directory? [${DEFAULT_DATA_DIR}/${CONTAINER_NAME}]: " DATA_DIR
    DATA_DIR=${DATA_DIR:-${DEFAULT_DATA_DIR}/${CONTAINER_NAME}}

    # setup directories
    ${SUDO} mkdir -p ${DATA_DIR}/{hls,nginx}

    # grab a copy of nginx.conf if it doesn't already exist
    echo ${DATA_DIR}/nginx/nginx.conf
    ls -al ${DATA_DIR}/nginx/nginx.conf
    if [[ ! -e ${DATA_DIR}/nginx/nginx.conf ]]; then
        echo "Fetching ${DEFAULT_NGINX_CONF}"
        curl -sL ${DEFAULT_NGINX_CONF} | ${SUDO} tee ${DATA_DIR}/nginx/nginx.conf >/dev/null
    fi

    # build the systemd service file
    read -r -d '' service <<-_EOF_
		[Unit]
		Description=nginx-rtmp in Docker container
		After=docker.service
		Requires=docker.service

		[Service]
		TimeoutStartSec=0
		Restart=always
		ExecStartPre=-/usr/bin/docker stop ${CONTAINER_NAME}
		ExecStartPre=-/usr/bin/docker rm ${CONTAINER_NAME}
		ExecStartPre=-/usr/bin/docker pull ${CONTAINER_REPO}
		ExecStart=/usr/bin/docker run --rm -t \\
		    -v ${DATA_DIR}/hls:/opt/data/hls \\
		    -v ${DATA_DIR}/nginx/logs:/opt/nginx/logs \\
		    -v ${DATA_DIR}/nginx/nginx.conf:/opt/nginx/nginx.conf \\
		    -p 1935:1935 \\
		    -p 8080:80 \\
		    --name ${CONTAINER_NAME} ${CONTAINER_REPO}
		ExecStop=-/usr/bin/docker stop -t 3 ${CONTAINER_NAME}
		ExecStop=-/usr/bin/docker rm ${CONTAINER_NAME}
		Restart=always
		RestartSec=10s

		[Install]
		WantedBy=multi-user.target
	_EOF_

    # write the systemd service file
    echo "${service}" | ${SUDO} tee /etc/systemd/system/container-${CONTAINER_NAME}.service >/dev/null

    # Ensure permissions are copacetic
    ${SUDO} chown root:root /etc/systemd/system/container-${CONTAINER_NAME}.service
    ${SUDO} chmod 0644 /etc/systemd/system/container-${CONTAINER_NAME}.service

    # reload systemd
    ${SUDO} systemctl daemon-reload

    # (re)start the service
    echo "running: ${SUDO} systemctl restart container-${CONTAINER_NAME}.service"
    (${SUDO} systemctl restart container-${CONTAINER_NAME}.service &)

    read -p "Hit [Enter] to follow the systemd log, Hit Ctrl-C at anytime"

    # follow the systemd service log
    ${SUDO} journalctl -fu container-${CONTAINER_NAME}.service

    exit 0
}

main $@
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