Suitable entrypoint for docker

entrypoint.sh

#!/bin/sh
set -e

if [ $(echo "$1" | cut -c1) = "-" ]; then
  echo "$0: assuming arguments"

  set -- myapp "$@"
fi

if [ $(echo "$1" | cut -c1) = "-" ] || [ "$1" = "myapp" ]; then

  echo "$0: setting data directory to $MYAPP_DATA"

  set -- "$@" -datadir="$MYAPP_DATA"
fi

if [ "$1" = "myappcli" ] || [ "$1" = "yourappcli" ]; then
  echo
  exec gosu myappcli "$@"
fi

echo
exec "$@"