shinysdr-entrypoint.sh

#!/bin/bash

# Copyright 2019 Jefferson J. Hunt
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# echo to stderr instead of stdout
function echoerr() {
  echo "$@" 1>&2;
}

# print out a message IF debug flag is set
function debug() {
  if [[ "${__DEBUG}" -eq "1" ]]; then
      echo $@
  fi
}

# stop shinysdr
function stop() {
    debug "stopping shinysdr"
    killall shinysdr
}

# start shinysdr
function start() {
    __CONFIG=${1:-/config}
    if [[ "${__INIT}" -eq "1" ]]; then        
        init ${__CONFIG}
    fi
    debug "starting with config: ${__CONFIG}"
    shinysdr ${__CONFIG}
}

# init config for shinysdr
function init() {
    __CONFIG=${1:-/config}
    debug "initalizing config: ${__CONFIG}"
    if [[ "${__FORCE}" -eq "1" ]]; then
        debug "removing old config: ${__CONFIG}"
        rm -rf ${__CONFIG}
    elif [[ -f "${__CONFIG}/config.py" ]]; then
        echoerr "${__CONFIG} exists, remove or use --force"
        exit 255
    fi
    debug "creating new config: ${__CONFIG}"
    shinysdr --create ${__CONFIG}
}

# print help
function help() {
cat << EOF

usage: ${SOURCE} [options] command <config>

  options:

    -d|--debug   : Print addition details to help solve problems

    -f|--force   : Creates a new config over an existing config

    -i|--init    : Create a new config
      
  comands:

    start        : start ShinySDR

    stop         : stop ShinySDR

    init         : init ShinySDR (Same as -i/--init) but as a standalone step

  config: specifies the location of the ShinySDR config, defaults to '/config'

example:

  shinysdr-entrypoint.sh -d -i start /my-config

docker-example:

  docker run --rm -it jeffersonjhunt/shinysdr -d -i start /conifg/my-config

See README.md for more details and examples

EOF
}

# Bootstrap
SOURCE="${BASH_SOURCE[0]}"
SOURCE=$(echo ${SOURCE} | sed 's/\.\///')
while [ -h "${SOURCE}" ]; do
    DIR="$( cd -P "$( dirname "${SOURCE}" )" && pwd )"
    SOURCE="$(readlink "${SOURCE}")"
    [[ ${SOURCE} != /* ]] && SOURCE="${DIR}/${SOURCE}"
done
DIR="$( cd -P "$( dirname "${SOURCE}" )" && pwd )"

# Try and help out a clueless user
case "$1" in
  help|-h|--help) help; exit;;
  *);;
esac

if [[ $# -eq 0 ]]; then
  help; exit
fi

# Process CLI Arugments
while [[ $# -gt 0 ]]; do
    key="$1"
    case "$key" in
        # use debug
        -d|--debug)
          __DEBUG=1
        ;;
        # use force
        -f|--force)
          __FORCE=1
        ;;
        # create config
        -i|--init)
          __INIT=1
        ;;
        # Commands
        init)
          shift
          init $@
          exit
        ;;
        start)
          shift
          start $@
          exit
        ;;
        stop)
          shift
          stop $@
          exit
        ;;
        # Interactive shell for container testing
        bash)
          shift
          bash -i
          exit
        ;;
        *)
          # wtf options
          echoerr "Unknown option '$key'"
        ;;
    esac
    # Shift after checking all the cases to get the next option
    shift
done

echoerr "no command"
help
exit 255

# fin