launch-app.sh

#!/usr/bin/env bash

image_name="docker-apps-test"
container_name="${image_name}"



function main {
  # Arguments to run the app
  APP_ARGS=""

  # parse arguments
  while [ -n "$1" ]; do
    case $1 in
      "--build")
        build_image
        ;;
      "-h" | "--help")
        print_usage
        exit 0
        ;;
      *)
        APP_ARGS="$APP_ARGS $1"
        ;;
    esac
    shift
  done

  if ! is_image_build; then
    build_image
  fi

  if ! is_container_created; then
    create_container
  fi

  if ! is_container_started; then
    start_container
  fi

  launch_app $APP_ARGS
}

function print_usage {
  echo "$0 [options] app-command [app-arguments]"
  echo "Options:"
  echo "  --build   (Re)build the containers image"
}






#####  HELPER FUNCTIONS  #####


function is_image_build {
  [ "$(docker images --filter reference=$container_name --quiet | wc --lines)" != 0 ]
  return $?
}

function build_image {
  docker build --rm --tag $image_name .
}





function is_container_created {
  [ "$(docker ps --filter name=$container_name --all --quiet | wc --lines)" != "0" ]
  return $?
}

function create_container {
  echo "Initializing the new docker container '$container_name' in the background..."

  export DISPLAY=:0
  docker create \
          -it \
	        -P \
          -e DISPLAY \
          -v /tmp/.X11-unix:/tmp/.X11-unix:rw \
          -v $(pwd):/home/dev/docker-apps:rw \
          --name $container_name \
          $image_name
}





function is_container_started {
  [ "$(docker ps --filter name=$container_name --quiet | wc --lines)" != "0" ]
  return $?
}

function start_container {
  # Get the container id
  container_id=$(docker ps -a -f name=$container_name -q)
  echo "Container ID is $container_id"

  # Open up the xhost server for the docker instance
  echo "Setting up the local xhost, so that apps from the container can render on the host."
  xhost +local:`docker inspect --format='{{ .Config.Hostname }}' $container_id`

  # Start the container
  echo "Start the container '$container_name' in the background..."
  docker start $container_name
}





function launch_app {
  docker exec $container_name $@ &
}



main $@