docker-minecraft-server/start-deployCustom

#!/bin/bash

. ${SCRIPTS:-/}start-utils

if isURL ${CUSTOM_SERVER}; then
  filename=$(basename ${CUSTOM_SERVER})
  export SERVER=/data/${filename}

  if [[ -f ${SERVER} ]] || [ -n "$FORCE_REDOWNLOAD" ]; then
    log "Using previously downloaded jar at ${SERVER}"
  else
   log "Downloading custom server jar from ${CUSTOM_SERVER} ..."
   if ! curl -sSL -o ${SERVER} ${CUSTOM_SERVER}; then
      log "Failed to download from ${CUSTOM_SERVER}"
      exit 2
    fi
  fi

elif [[ -f ${CUSTOM_SERVER} ]]; then
  log "Using custom server jar at ${CUSTOM_SERVER} ..."
  export SERVER=${CUSTOM_SERVER}

else
  log "CUSTOM_SERVER is not properly set to a URL or existing jar file"
  exit 2
fi

export SKIP_LOG4J_CONFIG=true

# Continue to Final Setup
exec ${SCRIPTS:-/}start-finalSetupWorld $@