docker-minecraft-server/scripts/start-deployCustom

#!/bin/bash

: "${CUSTOM_SERVER:=}"
: "${GENERIC_PACK:=}"
: "${CUSTOM_JAR_EXEC:=}"

# shellcheck source=start-utils
. "${SCRIPTS:-/}start-utils"
isDebugging && set -x

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

  if [[ -f ${SERVER} ]] && ! isTrue "$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 ${CUSTOM_SERVER} ]]; then
  export SERVER=${CUSTOM_SERVER}

elif [[ ${GENERIC_PACK} ]]; then
  log "Using custom server jar from generic pack at ${CUSTOM_SERVER} ..."
  export SERVER=${CUSTOM_SERVER}

elif [[ ${CUSTOM_JAR_EXEC} ]]; then
  log "CUSTOM_JAR_EXEC is in use, so \$SERVER will not be set"

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

fi

# Allow for overriding Family on custom for testing.
export FAMILY="${FAMILY:-HYBRID}"

exec "${SCRIPTS:-/}start-setupWorld" "$@"