2024-05-12 06:59:45 +00:00
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#!/bin/bash
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2024-05-27 03:07:25 +00:00
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set -eu
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2024-05-26 03:56:43 +00:00
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# Set eula value in eula.txt
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set_eula() {
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local EULA
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EULA="${1:-false}"
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EULAFILE="${EULAFILE:-/app/eula.txt}"
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sed -i.bak "s/^eula=.*\$/eula=${EULA:-false}/" "$EULAFILE"
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2024-05-27 01:47:55 +00:00
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diff --unified=1 "${EULAFILE}.bak" "$EULAFILE" || true
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2024-05-26 03:56:43 +00:00
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rm "${EULAFILE}.bak"
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}
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# Update server.properties using env
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set_properties() {
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# Basic settings
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DEBUG="${DEBUG:-false}"
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PREFIX="${PREFIX:-SETTINGS_}"
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FILE="${FILE:-/app/server.properties}"
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# Update server.properties
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while IFS='=' read -r ENVVAR VALUE ; do
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if echo "$ENVVAR" | grep -q "^${PREFIX}.*$"; then
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KEY="${ENVVAR#"$PREFIX"}"
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if ! grep -q "^${KEY}=" "$FILE"; then
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echo "[WARN]: \"$KEY\" does not exist in $FILE and was not updated"
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else
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2024-05-28 07:55:52 +00:00
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[ "$DEBUG" = "true" ] && echo "[DEBUG]: Updating \"$KEY\" to \"$VALUE\""
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2024-05-26 03:56:43 +00:00
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sed -i.bak "s/^${KEY}=.*/${KEY}=${VALUE}/" "$FILE"
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2024-05-28 07:55:52 +00:00
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diff --unified=1 "${FILE}.bak" "$FILE" || true
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2024-05-26 03:56:43 +00:00
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rm "${FILE}.bak"
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fi
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else
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if [ "$DEBUG" = "true" ]; then
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2024-05-28 07:55:52 +00:00
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echo "[DEBUG]: \"$ENVVAR\" doesn't have the prefix \"$PREFIX\""
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2024-05-26 03:56:43 +00:00
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fi
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fi
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done < <(env)
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# Show server.properties in DEBUG mode
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if [ "$DEBUG" = "true" ]; then
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2024-05-28 07:55:52 +00:00
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echo "[DEBUG]: Showing ${FILE}:"
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2024-05-26 03:56:43 +00:00
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cat "$FILE"
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fi
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}
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2024-05-12 06:59:45 +00:00
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2024-05-28 07:55:52 +00:00
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# Set Velocity's forwarding.secret
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set_forwarding_secret() {
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local WRITE_FILE
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local FILE_CONTENT
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WRITE_FILE=false
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# Check file is not empty
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if [ -s /app/forwarding.secret ]; then
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FILE_CONTENT="$(head -c 1025 /app/forwarding.secret)"
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# Check that FORWARDING_SECRET is blank
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if [ ! "${#FORWARDING_SECRET}" -gt 0 ]; then
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# Only the file was set, so FORWARDING_SECRET becomes the file
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FORWARDING_SECRET="$(head -c 1025 /app/forwarding.secret)"
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else
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if [ ! "$FORWARDING_SECRET" = "$FILE_CONTENT" ]; then
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# You should either bind mount a file in OR set a value
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echo "[ERROR]: FORWARDING_SECRET is set with an existing file"
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exit 1
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fi
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fi
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# If the file is zero, we make sure the variable isn't also zero
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elif [ "${#FORWARDING_SECRET}" -eq 0 ]; then
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echo "[ERROR]: You must set FORWARDING_SECRET or set a value in the file"
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exit 1
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else
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# File is zero, so we must write the variable out to the file
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WRITE_FILE=true
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fi
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# Check length
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if [ "${#FORWARDING_SECRET}" -lt 32 ]; then
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echo "[ERROR]: FORWARDING_SECRET needs to be at least 32 characters long"
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exit 1
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elif [ "${#FORWARDING_SECRET}" -gt 1024 ]; then
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echo "[ERROR]: FORWARDING_SECRET is >1024 bytes"
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exit 1
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fi
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# Add secret to file
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if [ "$WRITE_FILE" = "true" ]; then
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echo "$FORWARDING_SECRET" > /app/forwarding.secret
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fi
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# Unset sensitive value
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unset FORWARDING_SECRET
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}
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2024-05-15 07:22:34 +00:00
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# Check if the minecraft screen is still running
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2024-05-26 03:56:43 +00:00
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# shellcheck disable=SC2317
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2024-05-15 07:22:34 +00:00
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check_screen() {
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2024-05-26 03:56:43 +00:00
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local SCREEN_NAME
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SCREEN_NAME="$1"
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if [ "$(screen -ls | grep -cE "[0-9]+\.$SCREEN_NAME")" -eq 1 ]; then
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2024-05-15 07:22:34 +00:00
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return 0
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else
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return 1
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fi
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}
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2024-05-28 07:55:52 +00:00
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# Find Java PID, strace it, and wait for it to exit
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wait_on_java() {
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local JAVA_PID
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local JAVA_EXIT
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# Debug mode
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[ "$DEBUG" = "true" ] && ps aux
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# Capture PID and test
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JAVA_PID="$(pgrep java)"
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if ! kill -0 "$SCREEN_PID" 2>/dev/null; then
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echo "[ERROR]: Cannot find running Java process (PID: \"$JAVA_PID\")"
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exit 1
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fi
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# strace Java PID and get return code
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JAVA_EXIT="$(strace -e trace=exit -p "$JAVA_PID" 2>&1 \
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| grep -oP '^\+\+\+ exited with \K[0-9]+')"
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# Delay if Java exits non-zero
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if [ ! "$JAVA_EXIT" = "0" ]; then
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echo "[ERROR]: Java exited with non-zero status"
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sleep "${EXIT_DELAY:-5}"
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exit "$JAVA_EXIT"
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fi
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}
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2024-05-26 03:56:43 +00:00
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# Find screen PID, strace it, and wait for it to exit
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wait_on_screen() {
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local SCREEN_PID
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local SCREEN_NAME
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local STRACE_PID
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local TAIL_PID
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SCREEN_NAME="$1"
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# Get screen PID
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[ "$DEBUG" = "true" ] && screen -ls
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SCREEN_PID="$(
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screen -ls | grep -oE "[0-9]+\.$SCREEN_NAME" | cut -d. -f1
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)"
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# Check screen PID
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if ! kill -0 "$SCREEN_PID" 2>/dev/null; then
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echo "[ERROR] Cannot find \"$SCREEN_NAME\" screen (PID: \"$SCREEN_PID\")"
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exit 1
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fi
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# Output logs to stdout (touch in case slow to create)
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touch screenlog.0
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tail -f screenlog.0 &
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TAIL_PID="$!"
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2024-05-28 07:55:52 +00:00
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# Debug mode
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[ "$DEBUG" = "true" ] && ps aux
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2024-05-26 03:56:43 +00:00
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# Wait for screen to exit
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strace -e exit -e signal=none -p "$SCREEN_PID" 2>/dev/null &
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STRACE_PID="$!"
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2024-05-28 07:55:52 +00:00
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# Wait on Java PID first
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wait_on_java
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# Wait if screen is somehow still running
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2024-05-26 03:56:43 +00:00
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wait "$STRACE_PID"
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2024-05-28 07:55:52 +00:00
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# Kill tail PID
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if kill -0 "$TAIL_PID" 2>/dev/null; then
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kill "$TAIL_PID"
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fi
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2024-05-26 03:56:43 +00:00
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}
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2024-05-15 07:22:34 +00:00
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# Function to stop the server gracefully
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2024-05-26 03:56:43 +00:00
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# shellcheck disable=SC2317
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2024-05-15 07:22:34 +00:00
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stop_server() {
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2024-05-26 03:56:43 +00:00
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local SCREEN_NAME
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SCREEN_NAME="$1"
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if check_screen "$SCREEN_NAME"; then
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2024-05-15 07:22:34 +00:00
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# Run 'stop' inside screen and wait for the screen to exit
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2024-05-26 03:56:43 +00:00
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/usr/bin/screen -p 0 -S "$SCREEN_NAME" -X eval 'stuff "stop"\015'
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2024-05-15 07:22:34 +00:00
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wait "$STRACE_PID"
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# Stop tail -f to stdout
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if kill -0 "$TAIL_PID" 2>/dev/null; then
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kill "$TAIL_PID"
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fi
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# Check only this script is running (PID 1) and pgrep (2 PIDs total)
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PGREP_OUTPUT="$(pgrep .)"
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if ! [ "$(echo "$PGREP_OUTPUT" | wc -l)" -eq 2 ]; then
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2024-05-28 07:55:52 +00:00
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echo "[WARN]: Some processes might not have exited:"
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2024-05-15 07:22:34 +00:00
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echo "$PGREP_OUTPUT"
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exit 1
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fi
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# Exit cleanly
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2024-05-28 07:55:52 +00:00
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echo "[INFO]: Server stopped gracefully"
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2024-05-15 07:22:34 +00:00
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exit 0
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else
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echo "[ERROR]: Can't find which screen to use"
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screen -ls
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exit 1
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fi
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}
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2024-05-26 03:56:43 +00:00
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# Start the Minecraft server
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minecraft_server() {
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# Settings
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JVM_OPTS="${JVM_OPTS:--Xms1G -Xmx2G}"
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2024-05-12 06:59:45 +00:00
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2024-05-26 03:56:43 +00:00
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# Set EULA
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set_eula "${EULA:-false}"
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2024-05-12 06:59:45 +00:00
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2024-05-26 03:56:43 +00:00
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# Update server.properties using env
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set_properties
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2024-05-12 06:59:45 +00:00
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2024-05-26 03:56:43 +00:00
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# Set up a SIGTERM signal trap to stop the server
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trap 'stop_server minecraft' SIGTERM
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2024-05-12 06:59:45 +00:00
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2024-05-28 07:55:52 +00:00
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# temp
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ls -al /app
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ls -al /app/config
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2024-05-26 03:56:43 +00:00
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# Run server in screen (without attaching)
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2024-05-28 07:55:52 +00:00
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echo "[INFO]: Starting Minecraft server"
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2024-05-26 03:56:43 +00:00
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/usr/bin/screen -dmS minecraft -L \
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bash -c "/usr/bin/java $JVM_OPTS -jar server.jar --nogui"
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2024-05-12 06:59:45 +00:00
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2024-05-26 03:56:43 +00:00
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# Wait for 'minecraft' screen PID to exit
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wait_on_screen minecraft
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exit 0
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}
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2024-05-15 07:22:34 +00:00
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2024-05-26 03:56:43 +00:00
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# Start the Velocity proxy Minecraft server
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velocity_server() {
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# Settings
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JVM_OPTS="${JVM_OPTS:--Xms1G -Xmx2G}"
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2024-05-28 07:55:52 +00:00
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# Ensure there is a forwarding.secret
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set_forwarding_secret
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2024-05-26 03:56:43 +00:00
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# Set up a SIGTERM signal trap to stop the server
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trap 'stop_server velocity' SIGTERM
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# Start server
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2024-05-28 07:55:52 +00:00
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echo "[INFO]: Starting Velocity server"
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2024-05-26 03:56:43 +00:00
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/usr/bin/screen -dmS velocity -L \
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bash -c "
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/usr/bin/java $JVM_OPTS -XX:+UseG1GC -XX:G1HeapRegionSize=4M \
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-XX:+UnlockExperimentalVMOptions -XX:+ParallelRefProcEnabled \
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-XX:+AlwaysPreTouch -XX:MaxInlineLevel=15 -jar velocity.jar
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"
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# Wait for 'velocity' screen PID to exit
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wait_on_screen velocity
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}
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2024-05-15 07:22:34 +00:00
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2024-05-26 03:56:43 +00:00
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# Enable debug mode
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DEBUG="${DEBUG:-false}"
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if [ "$DEBUG" = "true" ]; then
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2024-05-28 07:55:52 +00:00
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echo "[DEBUG]: Running entrypoint script at $(which entrypoint.sh)"
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2024-05-26 03:56:43 +00:00
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sleep 0.2
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set -ux
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2024-05-15 07:22:34 +00:00
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fi
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2024-05-26 03:56:43 +00:00
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# Start Velocity proxy if VELOCITY='true' otherwise start a Minecraft server
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VELOCITY="${VELOCITY:-false}"
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if [ "$VELOCITY" = "true" ]; then
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# Start Velocity proxy
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velocity_server
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else
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# Start Minecraft
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minecraft_server
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fi
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2024-05-15 07:22:34 +00:00
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2024-05-26 03:56:43 +00:00
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# Exit gracefully
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exit 0
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