492 lines
17 KiB
Bash
Executable File
492 lines
17 KiB
Bash
Executable File
#!/bin/bash
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# The actual program name
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declare -r myname="minecraftd"
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declare -r game="minecraft"
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# General rule for the variable-naming-schema:
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# Variables in capital letters may be passed through the command line others not.
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# Avoid altering any of those later in the code since they may be readonly (IDLE_SERVER is an exception!)
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# You may use this script for any game server of your choice, just alter the config file
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[[ -n "${SERVER_ROOT}" ]] && declare -r SERVER_ROOT=${SERVER_ROOT} || SERVER_ROOT="/srv/${game}"
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[[ -n "${BACKUP_DEST}" ]] && declare -r BACKUP_DEST=${BACKUP_DEST} || BACKUP_DEST="/srv/${game}/backup"
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[[ -n "${BACKUP_PATHS}" ]] && declare -r BACKUP_PATHS=${BACKUP_PATHS} || BACKUP_PATHS="world"
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[[ -n "${KEEP_BACKUPS}" ]] && declare -r KEEP_BACKUPS=${KEEP_BACKUPS} || KEEP_BACKUPS="10"
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[[ -n "${GAME_USER}" ]] && declare -r GAME_USER=${GAME_USER} || GAME_USER="minecraft"
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[[ -n "${MAIN_EXECUTABLE}" ]] && declare -r MAIN_EXECUTABLE=${MAIN_EXECUTABLE} || MAIN_EXECUTABLE="minecraft_server.jar"
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[[ -n "${SESSION_NAME}" ]] && declare -r SESSION_NAME=${SESSION_NAME} || SESSION_NAME="${game}"
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# Command and parameter declaration with which to start the server
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[[ -n "${SERVER_START_CMD}" ]] && declare -r SERVER_START_CMD=${SERVER_START_CMD} || SERVER_START_CMD="java -Xms512M -Xmx1024M -XX:ParallelGCThreads=1 -jar './${MAIN_EXECUTABLE}' nogui"
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# System parameters for the control script
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[[ -n "${IDLE_SERVER}" ]] && tmp_IDLE_SERVER=${IDLE_SERVER} || IDLE_SERVER="false"
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[[ -n "${IDLE_SESSION_NAME}" ]] && declare -r IDLE_SESSION_NAME=${IDLE_SESSION_NAME} || IDLE_SESSION_NAME="idle_server_${SESSION_NAME}"
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[[ -n "${GAME_PORT}" ]] && declare -r GAME_PORT=${GAME_PORT} || GAME_PORT="25565"
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[[ -n "${CHECK_PLAYER_TIME}" ]] && declare -r CHECK_PLAYER_TIME=${CHECK_PLAYER_TIME} || CHECK_PLAYER_TIME="30"
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[[ -n "${IDLE_IF_TIME}" ]] && declare -r IDLE_IF_TIME=${IDLE_IF_TIME} || IDLE_IF_TIME="1200"
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# Additional configuration options which only few may need to alter
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[[ -n "${GAME_COMMAND_DUMP}" ]] && declare -r GAME_COMMAND_DUMP=${GAME_COMMAND_DUMP} || GAME_COMMAND_DUMP="/tmp/${myname}_${SESSION_NAME}_command_dump.txt"
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# Variables passed over the command line will always override the one from a config file
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source /etc/conf.d/"${game}" 2>/dev/null || >&2 echo "Could not source /etc/conf.d/${game}"
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# Preserve the content of IDLE_SERVER without making it readonly
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[[ -n ${tmp_IDLE_SERVER} ]] && IDLE_SERVER=${tmp_IDLE_SERVER}
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# Strictly disallow uninitialized Variables
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set -u
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# Exit if a single command breaks and its failure is not handled accordingly
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set -e
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# Check whether sudo is needed at all
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if [[ "$(whoami)" == "${GAME_USER}" ]]; then
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SUDO_CMD=""
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else
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SUDO_CMD="sudo -u ${GAME_USER}"
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fi
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# Choose which flavor of netcat is to be used
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if command -v netcat &> /dev/null; then
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NETCAT_CMD="netcat"
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elif command -v ncat &> /dev/null; then
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NETCAT_CMD="ncat"
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else
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NETCAT_CMD=""
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fi
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# Check for sudo rigths
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if [[ "$(${SUDO_CMD} whoami)" != "${GAME_USER}" ]]; then
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>&2 echo -e "You have \e[39;1mno permission\e[0m to run commands as $GAME_USER user."
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exit 21
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fi
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# Pipe any given argument to the game server console,
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# sleep for $sleep_time and return its output if $return_stdout is set
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game_command() {
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if [[ -z "${return_stdout:-}" ]]; then
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${SUDO_CMD} screen -S "${SESSION_NAME}" -X stuff "$(printf "%s\r" "$*")"
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else
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${SUDO_CMD} screen -S "${SESSION_NAME}" -X log on
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${SUDO_CMD} screen -S "${SESSION_NAME}" -X stuff "$(printf "%s\r" "$*")"
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sleep "${sleep_time:-0.3}"
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${SUDO_CMD} screen -S "${SESSION_NAME}" -X log off
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${SUDO_CMD} cat "${GAME_COMMAND_DUMP}"
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${SUDO_CMD} rm "${GAME_COMMAND_DUMP}"
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fi
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}
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# Check whether there are player on the server through list
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is_player_online() {
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response="$(sleep_time=0.6 return_stdout=true game_command list)"
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# Delete leading line and free response string from fancy characters
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response="$(echo "${response}" | sed -r -e '$!d' -e 's/\x1B\[([0-9]{1,2}(;[0-9]{1,2})*)?[JKmsuG]//g')"
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# The list command prints a line containing the usernames after the last occurrence of ": "
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# and since playernames may not contain this string the clean player-list can easily be retrieved.
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# Otherwiese check the first digit after the last occurrence of "There are". If it is 0 then there
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# are no players on the server. Should this test fail as well. Assume that a player is online.
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if [[ $(echo "${response}" | grep ":" | sed -e 's/.*\: //' | tr -d '\n' | wc -c) -le 1 ]]; then
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# No player is online
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return 0
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elif [[ "x$(echo "${response}" | grep "There are" | sed -r -e 's/.*\: //' -e 's/^([^.]+).*$/\1/; s/^[^0-9]*([0-9]+).*$/\1/' | tr -d '\n')" == "x0" ]]; then
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# No player is online
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return 0
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else
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# A player is online (or it could not be determined)
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return 1
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fi
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}
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# Check whether the server is visited by a player otherwise shut it down
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idle_server_daemon() {
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# This function is run within a screen session of the GAME_USER therefore SUDO_CMD can be omitted
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if [[ "$(whoami)" != "${GAME_USER}" ]]; then
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>&2 echo "Somehow this hidden function was not executed by the ${GAME_USER} user."
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>&2 echo "This should not have happend. Are you messing around with this script? :P"
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exit 22
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fi
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# Time in seconds for which no player was on the server
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no_player=0
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while true; do
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echo -e "no_player: ${no_player}s\tcheck_player_time: ${CHECK_PLAYER_TIME}s\tidle_if_time: ${IDLE_IF_TIME}s"
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# Retry in ${CHECK_PLAYER_TIME} seconds
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sleep ${CHECK_PLAYER_TIME}
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if screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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# Game server is up and running
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if [[ "$(screen -S "${SESSION_NAME}" -ls | sed -n "s/.*${SESSION_NAME}\s\+//gp")" == "(Attached)" ]]; then
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# An administrator is connected to the console, pause player checking
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echo "An admin is connected to the console. Pause player checking."
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# Check for active player
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elif SUDO_CMD="" is_player_online; then
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# No player was seen on the server through list
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no_player=$(( no_player + CHECK_PLAYER_TIME ))
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# Stop the game server if no player was active for at least ${IDLE_IF_TIME}
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if [[ "${no_player}" -ge "${IDLE_IF_TIME}" ]]; then
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IDLE_SERVER="false" ${myname} stop
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# Wait for game server to go down
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for i in {1..100}; do
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screen -S "${SESSION_NAME}" -Q select . > /dev/null || break
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[[ $i -eq 100 ]] && echo -e "An \e[39;1merror\e[0m occurred while trying to reset the idle_server!"
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sleep 0.1
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done
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# Reset timer and give the player 300 seconds to connect after pinging
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no_player=$(( IDLE_IF_TIME - 300 ))
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# Game server is down, listen on port ${GAME_PORT} for incoming connections
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echo -n "Netcat: "
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${NETCAT_CMD} -v -l -p ${GAME_PORT} && echo "Netcat caught an connection. The server is coming up again..."
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IDLE_SERVER="false" ${myname} start
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fi
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else
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# Reset timer since there is an active player on the server
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no_player=0
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fi
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else
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# Reset timer and give the player 300 seconds to connect after pinging
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no_player=$(( IDLE_IF_TIME - 300 ))
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# Game server is down, listen on port ${GAME_PORT} for incoming connections
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echo -n "Netcat: "
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${NETCAT_CMD} -v -l -p ${GAME_PORT} && echo "Netcat caught an connection. The server is coming up again..."
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IDLE_SERVER="false" ${myname} start
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fi
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done
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}
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# Start the server if it is not already running
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server_start() {
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# Start the game server
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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echo "A screen ${SESSION_NAME} session is already running. Please close it first."
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else
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echo -en "Starting server..."
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${SUDO_CMD} screen -dmS "${SESSION_NAME}" /bin/bash -c "cd '${SERVER_ROOT}'; ${SERVER_START_CMD}"
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${SUDO_CMD} screen -S "${SESSION_NAME}" -X logfile "${GAME_COMMAND_DUMP}"
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echo -e "\e[39;1m done\e[0m"
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fi
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if [[ "${IDLE_SERVER,,}" == "true" ]]; then
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# Check for the availability of the netcat (nc) binaries
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if [[ -z "${NETCAT_CMD}" ]]; then
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>&2 echo "The netcat binaries are needed for suspending an idle server."
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exit 12
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fi
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# Start the idle server daemon
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if ${SUDO_CMD} screen -S "${IDLE_SESSION_NAME}" -Q select . > /dev/null; then
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${SUDO_CMD} screen -S "${IDLE_SESSION_NAME}" -X quit
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# Restart as soon as the idle_server_daemon has shut down completely
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for i in {1..100}; do
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if ! ${SUDO_CMD} screen -S "${IDLE_SESSION_NAME}" -Q select . > /dev/null; then
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${SUDO_CMD} screen -dmS "${IDLE_SESSION_NAME}" /bin/bash -c "${myname} idle_server_daemon"
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break
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fi
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[[ $i -eq 100 ]] && echo -e "An \e[39;1merror\e[0m occurred while trying to reset the idle_server!"
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sleep 0.1
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done
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else
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echo -en "Starting idle server daeomon..."
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${SUDO_CMD} screen -dmS "${IDLE_SESSION_NAME}" /bin/bash -c "${myname} idle_server_daemon"
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echo -e "\e[39;1m done\e[0m"
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fi
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fi
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}
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# Stop the server gracefully by saving everything prior and warning the users
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server_stop() {
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# Quit the idle daemon
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if [[ "${IDLE_SERVER,,}" == "true" ]]; then
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# Check for the availability of the netcat (nc) binaries
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if [[ -z "${NETCAT_CMD}" ]]; then
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>&2 echo "The netcat binaries are needed for suspending an idle server."
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exit 12
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fi
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if ${SUDO_CMD} screen -S "${IDLE_SESSION_NAME}" -Q select . > /dev/null; then
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echo -en "Stopping idle server daemon..."
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${SUDO_CMD} screen -S "${IDLE_SESSION_NAME}" -X quit
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echo -e "\e[39;1m done\e[0m"
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else
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echo "The corresponding screen session for ${IDLE_SESSION_NAME} was already dead."
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fi
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fi
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# Gracefully exit the game server
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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# Game server is up and running, gracefully stop the server when there are still active players
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# Check for active player
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if is_player_online; then
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# No player was seen on the server through list
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echo -en "Server is going down..."
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game_command stop
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else
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# Player(s) were seen on the server through list (or an error occurred)
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# Warning the users through the server console
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game_command say "Server is going down in 10 seconds! HURRY UP WITH WHATEVER YOU ARE DOING!"
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game_command save-all
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echo -en "Server is going down in..."
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for i in {1..10}; do
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game_command say "down in... $(( 10 - i ))"
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echo -n " $(( 10 - i ))"
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sleep 1
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done
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game_command stop
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fi
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# Finish as soon as the server has shut down completely
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for i in {1..100}; do
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if ! ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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echo -e "\e[39;1m done\e[0m"
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break
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fi
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[[ $i -eq 100 ]] && echo -e "\e[39;1m timed out\e[0m"
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sleep 0.1
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done
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else
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echo "The corresponding screen session for ${SESSION_NAME} was already dead."
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fi
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}
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# Print whether the server is running and if so give some information about memory usage and threads
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server_status() {
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# Print status information about the idle daemon
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if [[ "${IDLE_SERVER,,}" == "true" ]]; then
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# Check for the availability of the netcat (nc) binaries
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if [[ -z "${NETCAT_CMD}" ]]; then
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>&2 echo "The netcat binaries are needed for suspending an idle server."
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exit 12
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fi
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if ${SUDO_CMD} screen -S "${IDLE_SESSION_NAME}" -Q select . > /dev/null; then
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echo -e "Idle server daemon status:\e[39;1m running\e[0m"
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else
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echo -e "Idle server daemon status:\e[39;1m stopped\e[0m"
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fi
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fi
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# Print status information for the game server
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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echo -e "Status:\e[39;1m running\e[0m"
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# Calculating memory usage
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for p in $(${SUDO_CMD} pgrep -f "${MAIN_EXECUTABLE}"); do
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ps -p"${p}" -O rss | tail -n 1;
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done | gawk '{ count ++; sum += $2 }; END {count --; print "Number of processes =", count, "(screen, bash,", count-2, "x server)"; print "Total memory usage =", sum/1024, "MB" ;};'
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else
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echo -e "Status:\e[39;1m stopped\e[0m"
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fi
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}
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# Restart the complete server by shutting it down and starting it again
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server_restart() {
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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server_stop
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server_start
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else
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server_start
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fi
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}
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# Backup the directories specified in BACKUP_PATHS
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backup_files() {
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# Check for the availability of the tar binaries
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if ! command -v tar &> /dev/null; then
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>&2 echo "The tar binaries are needed for a backup."
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exit 11
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fi
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echo "Starting backup..."
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FILE="$(date +%Y_%m_%d_%H.%M.%S).tar.gz"
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${SUDO_CMD} mkdir -p "${BACKUP_DEST}"
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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game_command save-off
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game_command save-all
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sync && wait
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${SUDO_CMD} tar -C "${SERVER_ROOT}" -czf "${BACKUP_DEST}/${FILE}" --totals ${BACKUP_PATHS} 2>&1 | grep -v "tar: Removing leading "
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game_command save-on
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else
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${SUDO_CMD} tar -C "${SERVER_ROOT}" -czf "${BACKUP_DEST}/${FILE}" --totals ${BACKUP_PATHS} 2>&1 | grep -v "tar: Removing leading "
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fi
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echo -e "\e[39;1mbackup completed\e[0m\n"
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echo -n "Only keeping the last ${KEEP_BACKUPS} backups and removing the other ones..."
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BACKUP_COUNT=$(for f in "${BACKUP_DEST}"/[0-9_.]*; do echo "${f}"; done | wc -l)
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if [[ $(( BACKUP_COUNT - KEEP_BACKUPS )) -gt 0 ]]; then
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for old_backup in $(for f in "${BACKUP_DEST}"/[0-9_.]*; do echo "${f}"; done | head -n"$(( BACKUP_COUNT - KEEP_BACKUPS ))"); do
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${SUDO_CMD} rm "${old_backup}";
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done
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echo -e "\e[39;1m done\e[0m ($(( BACKUP_COUNT - KEEP_BACKUPS)) backup(s) pruned)"
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else
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echo -e "\e[39;1m done\e[0m (no backups pruned)"
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fi
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}
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# Restore backup
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backup_restore() {
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# Check for the availability of the tar binaries
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if ! command -v tar &> /dev/null; then
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>&2 echo "The tar binaries are needed for a backup."
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exit 11
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fi
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# Only allow the user to restore a backup if the server is down
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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>&2 echo -e "The \e[39;1mserver should be down\e[0m in order to restore the world data."
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exit 3
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fi
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# Either let the user choose a backup or expect one as an argument
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if [[ $# -lt 1 ]]; then
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echo "Please enter the corresponding number for the backup to be restored: "
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i=1
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for f in "${BACKUP_DEST}"/[0-9_.]*; do
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echo -e " \e[39;1m$i)\e[0m\t$f"
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i=$(( i + 1 ))
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done
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echo -en "Restore backup number: "
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# Read in user input
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read -r user_choice
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# Interpeting the input
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if [[ $user_choice =~ ^-?[0-9]+$ ]]; then
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n=1
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for f in "${BACKUP_DEST}"/[0-9_.]*; do
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[[ ${n} -eq $user_choice ]] && FILE="$f"
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n=$(( n + 1 ))
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done
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if [[ -z $FILE ]]; then
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>&2 echo -e "\e[39;1mFailed\e[0m to interpret your input. Please enter the digit of the presented options."
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exit 5
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fi
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else
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>&2 echo -e "\e[39;1mFailed\e[0m to interpret your input. Please enter a valid digit for one of the presented options."
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exit 6
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fi
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elif [[ $# -eq 1 ]]; then
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# Check for the existance of the specified file
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if [[ -f "$1" ]]; then
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FILE="$1"
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else
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if [[ -f "${BACKUP_DEST}"/"$1" ]]; then
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FILE="${BACKUP_DEST}"/"$1"
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else
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>&2 echo -e "Sorry, but '$1', is \e[39;1mnot a valid file\e[0m, neither in your current directory nor in the backup folder."
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exit 4
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fi
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fi
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elif [[ $# -gt 1 ]]; then
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>&2 echo -e "\e[39;1mToo many arguments.\e[0m Please pass only the filename for the world data as an argument."
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>&2 echo "Or alternatively no arguments at all to chose from a list of available backups."
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exit 7
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fi
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echo "Restoring backup..."
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if ${SUDO_CMD} tar -xf "${FILE}" -C "${SERVER_ROOT}" 2>&1; then
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echo -e "\e[39;1mRestoration completed\e[0m"
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else
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echo -e "\e[39;1mFailed to restore backup.\e[0m"
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fi
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}
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# Run the given comman at the game server console
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server_command() {
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if [[ $# -lt 1 ]]; then
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>&2 echo "No server command specified. Try 'help' for a list of commands."
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exit 1
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fi
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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return_stdout=true game_command "$@"
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else
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echo "There is no ${SESSION_NAME} session to connect to."
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fi
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}
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# Enter the screen game session
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server_console() {
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if ${SUDO_CMD} screen -S "${SESSION_NAME}" -Q select . > /dev/null; then
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# Circumvent a permission bug related to running GNU screen as a different user,
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# see e.g. https://serverfault.com/questions/116775/sudo-as-different-user-and-running-screen
|
|
${SUDO_CMD} script -q -c "screen -S \"${SESSION_NAME}\" -rx" /dev/null
|
|
else
|
|
echo "There is no ${SESSION_NAME} session to connect to."
|
|
fi
|
|
}
|
|
|
|
# Help function, no arguments required
|
|
help() {
|
|
cat <<-EOF
|
|
This script was design to easily control any ${game} server. Quite every parameter for a given
|
|
${game} server derivative can be altered by editing the variables in the configuration file.
|
|
|
|
Usage: ${myname} {start|stop|status|backup|restore|command <command>|console}
|
|
start Start the ${game} server
|
|
stop Stop the ${game} server
|
|
restart Restart the ${game} server
|
|
status Print some status information
|
|
backup Backup the world data
|
|
restore [filename] Restore the world data from a backup
|
|
command <command> Run the given comman at the ${game} server console
|
|
console Enter the server console through a screen session
|
|
|
|
Copyright (c) Gordian Edenhofer <gordian.edenhofer@gmail.com>
|
|
EOF
|
|
}
|
|
|
|
case "${1:-}" in
|
|
start)
|
|
server_start
|
|
;;
|
|
|
|
stop)
|
|
server_stop
|
|
;;
|
|
|
|
status)
|
|
server_status
|
|
;;
|
|
|
|
restart)
|
|
server_restart
|
|
;;
|
|
|
|
console)
|
|
server_console
|
|
;;
|
|
|
|
command)
|
|
server_command "${@:2}"
|
|
;;
|
|
|
|
backup)
|
|
backup_files
|
|
;;
|
|
|
|
restore)
|
|
backup_restore "${@:2}"
|
|
;;
|
|
|
|
idle_server_daemon)
|
|
# This shell be a hidden function which should only be invoced internally
|
|
idle_server_daemon
|
|
;;
|
|
|
|
-h|--help)
|
|
help
|
|
exit 0
|
|
;;
|
|
|
|
*)
|
|
help
|
|
exit 1
|
|
;;
|
|
esac
|
|
|
|
exit 0
|