🎉 initial codebase
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Dockerfile
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Dockerfile
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FROM alpine:latest
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RUN apk --update add bash curl git jq openjdk21-jdk && rm -rf /var/cache/apk/*
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COPY ./entrypoint.sh /entrypoint.sh
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COPY ./cmd /usr/bin/cmd
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ENTRYPOINT ["/entrypoint.sh"]
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10
cmd
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10
cmd
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#!/usr/bin/env bash
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set -euo pipefail
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## CONSTANTS ##
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readonly SERVER_FD_DIR="/opt/spigot-fd"
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## APPEND TO STDIN FD ##
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echo "$@" >> "${SERVER_FD_DIR}/stdin"
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364
entrypoint.sh
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364
entrypoint.sh
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#!/usr/bin/env bash
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set -euo pipefail
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## CONSTANTS ##
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readonly DATA_DIR="/opt/spigot-data"
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readonly SERVER_JAR_PATH="${DATA_DIR}/server.jar"
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readonly BUILD_META_DIR="${DATA_DIR}/.build-meta"
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readonly BUILD_DIR="/opt/spigotbuild"
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readonly SERVER_FD_DIR="/opt/spigot-fd"
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## PUBLIC VARIABLES ##
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declare spigot_pid
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declare proc_pid
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## HANDLE EXIT SIGNALS ##
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trap trap_exit EXIT SIGINT SIGTERM
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trap_exit(){
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# try stopping server first
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if [[ "${spigot_pid:+x}" && "$spigot_pid" -gt 0 ]]; then
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cmd "stop"
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local w=0
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while proc_running "$spigot_pid"; do
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w=$(( w + 1 ))
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snore 1
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if [[ "$w" -ge 30 ]]; then
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echo "[WARN ] Spigot did not react to stop command after 30s; using normal process shutdown actions" 1>&2
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proc_pid="$spigot_pid"
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break
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fi
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done
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fi
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# normal process
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if [[ "${proc_pid:+x}" && "$proc_pid" -gt 0 ]]; then
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kill -- $proc_pid 2> /dev/null || true
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local q=0
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while proc_running "$proc_pid"; do
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q=$(( q + 1 ))
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snore 1
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if [[ "$q" -ge 15 ]]; then
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echo "[WARN ] Sending kill to running process $proc_pid" 1>&2
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kill -s KILL -- $proc_pid 2> /dev/null || true
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break
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fi
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done
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fi
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exit 0
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}
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#
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# LIB: Efficient sleep (does not create a new process).
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#
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snore(){
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local IFS
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[[ -n "${_snore_fd:-}" ]] || exec {_snore_fd}<> <(:)
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read ${1:+-t "$1"} -u $_snore_fd || true
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}
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#
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# HELPER: Check whether given pid is running.
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#
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# @param $1 Process ID.
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#
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# @exit 0: Process is running
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# 1: Process is not running.
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#
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proc_running(){
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# try reading state
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local state_path="/proc/$1/stat"
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[[ ! -f "$state_path" ]] && return 1
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local state
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state=$(cat "$state_path" 2> /dev/null | cut -d ' ' -f3) || return 1
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# parse state
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case "$state" in
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R|S|D|Z|W|W|P|I) return 0;;
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*) return 1;;
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esac
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}
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#
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# HELPER: Check whether spigot can be built for a given MC Version.
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#
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# @param $1 MC Version.
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#
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# @exit 0: Valid MC Version for a spigot build
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# 1: Invalid MC Version for a spigot build.
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#
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mc_version_is_valid(){
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local version="$1"
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## CHECK FORMAT ##
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if [[ ! "$version" =~ ^(latest|[0-9]+\.[0-9]+\.[0-9]+)$ ]]; then
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return 1
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fi
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## CHECK AVAILABILITY ##
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local version_refs
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version_refs=$(spigot_version_refs "$version") || return 1
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## RETURN ##
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return 0
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}
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#
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# HELPER: Request spigot version refs from server.
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#
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# @param $1 MC Version.
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#
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# @return Refs JSON.
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# @exit 0: Refs lookup successful
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# 1: Refs lookup failed.
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#
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spigot_version_refs(){
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## FETCH DATA ##
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# make request
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local api_response
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local curl_exit=0
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api_response=$(curl -fsm 10 "https://hub.spigotmc.org/versions/${1}.json") || curl_exit="$?"
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if [[ "$curl_exit" -gt 0 ]]; then
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echo "[ERROR] Failed to fetch refs" 1>&2
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return 1
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fi
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# validate returned data
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local refs
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local jq_exit=0
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refs=$(echo -n "$api_response" | jq -r ".refs" 2> /dev/null) || jq_exit="$?"
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if [[ "$jq_exit" -gt 0 ]]; then
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echo "[ERROR] Failed to parse refs api response" 1>&2
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return 1
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fi
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## RETURN ##
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echo -n "$refs"
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return 0
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}
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#
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# HELPER: (Re-)build server jar if required.
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#
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build_check(){
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## CHECK FOR MISSING BUILD ARTIFACTS ##
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for f in $SERVER_JAR_PATH ${BUILD_META_DIR}/{mc_version,spigot,craftbukkit}; do
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if [[ ! -f "$f" ]]; then
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echo "[WARN ] Missing build artifact detected: '$f'" 1>&2
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build_run; return 0
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fi
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done
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## CHECK WHETHER MC VERSION WAS CHANGED ##
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local mc_version_curr=$(cat "${BUILD_META_DIR}/mc_version") || exit 1
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if [[ "$MC_VERSION" != "$mc_version_curr" ]]; then
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echo "[INFO ] MC Version changed" 1>&2
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build_run; return 0
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fi
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## IGNORE REST IF AUTO UPDATE IS OFF ##
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[[ "$AUTO_UPDATE" -gt 0 ]] && return 0
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## CHECK FOR REFS CHANGE ##
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# get all refs
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local version_refs
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version_refs=$(spigot_version_refs "$MC_VERSION") || exit 1
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# compare
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for r in CraftBukkit Spigot; do
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# parse remote ref
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local ref_remote
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local jq_exit=0
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ref_remote=$(echo -n "$version_refs" | jq -r ".${r}" 2> /dev/null) || jq_exit="$?"
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if [[ "$jq_exit" -gt 0 || ! "$ref_remote" =~ ^[0123456789abcdef]{40}$ ]]; then
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echo "[ERROR] Failed to parse remote ref '$r': $ref_remote" 1>&2
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exit 1
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fi
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# load local ref
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local ref_local_path="${BUILD_META_DIR}/$(echo -n "$r" | tr A-Z a-z)"
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local ref_local
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ref_local=$(cat "$ref_local_path")
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# compare
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if [[ "$ref_local" != "$ref_remote" ]]; then
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echo "[INFO ] Remote ref '$r' has changed: '$ref_remote'" 1>&2
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build_run; return 0
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fi
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done
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## NO BUILD REQUIRED ##
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return 0
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}
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#
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# HELPER: Run a server build.
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#
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build_run(){
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echo "[INFO ] (Re-)building server" 1>&2
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## CLEAN UP BUILD AREA ##
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rm -rf "$BUILD_DIR"
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mkdir -p "$BUILD_DIR"
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pushd "$BUILD_DIR" > /dev/null
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## BUILD ##
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# download build tools
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wget -O BuildTools.jar https://hub.spigotmc.org/jenkins/job/BuildTools/lastSuccessfulBuild/artifact/target/BuildTools.jar & proc_pid="$!"
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wait $proc_pid; proc_pid="0"
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# run build tools
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java -jar BuildTools.jar --rev "$MC_VERSION" --final-name "server.jar" & proc_pid="$!"
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wait $proc_pid; proc_pid="0"
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# verify
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if [[ ! -f "server.jar" ]]; then
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echo "[ERROR] Build did not produce a server jar" 1>&2
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exit 1
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fi
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## STORE BUILD METADATA ##
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# mc version
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echo -n "$MC_VERSION" > "${BUILD_META_DIR}/mc_version"
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# git rev hashes
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for d in CraftBukkit Spigot; do
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pushd "$d" > /dev/null
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local git_rev
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git_rev=$(git rev-parse HEAD)
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echo -n "$git_rev" > "${BUILD_META_DIR}/$(echo -n "$d" | tr A-Z a-z)"
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popd > /dev/null
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done
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## FINISH ##
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# return to previous working directory
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popd > /dev/null
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# switch to new server jar
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build_switch
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# print info
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echo "[INFO ] (Re-)build successful" 1>&2
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return 0
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}
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#
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# HELPER: Switch spigot jar to build output.
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#
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build_switch(){
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## MAYBE SET ASIDE OLD JAR ##
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[[ -f "$SERVER_JAR_PATH" ]] && mv "$SERVER_JAR_PATH" "${SERVER_JAR_PATH}.old"
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if ! mv "${BUILD_DIR}/server.jar" "$SERVER_JAR_PATH"; then
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echo "[ERROR] Failed to switch to new server jar" 1>&2
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[[ -f "${SERVER_JAR_PATH}.old" ]] && echo "[INFO ] Old jar file retained as '${SERVER_JAR_PATH}.old'" 1>&2
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exit 1
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fi
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## MAYBE DELETE OLD JAR ##
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[[ -f "${SERVER_JAR_PATH}.old" ]] && rm "${SERVER_JAR_PATH}.old"
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return 0
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}
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#
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# HELPER: Initialize spigot server files.
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#
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spigot_init(){
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## MAYBE WRITE EULA ##
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if [[ ! -f "${DATA_DIR}/eula.txt" ]]; then
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echo "eula=true" > "${DATA_DIR}/eula.txt"
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fi
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}
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## VALIDATE ENV ##
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# eula
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if [[ ! "${AGREE_MINECRAFT_EULA:-}" =~ ^(on|yes|true|1)$ ]]; then
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echo "[ERROR] You must agree to the Minecraft EULA (https://aka.ms/MinecraftEULA)" 1>&2
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echo "[INFO ] To agree, set AGREE_MINECRAFT_EULA environment variable to 'yes'" 1>&2
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exit 1
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fi
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# mc version
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if [[ -z "${MC_VERSION:+x}" ]]; then
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MC_VERSION="latest"
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echo "[INFO ] Using default mc version: '$MC_VERSION'" 1>&2
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fi
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if ! mc_version_is_valid "$MC_VERSION"; then
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echo "[ERROR] Not a valid MC Version for a spigot build (yet): '$MC_VERSION'" 1>&2
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exit 1
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fi
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# auto update
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if [[ -z "${AUTO_UPDATE:+x}" ]]; then
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AUTO_UPDATE="yes"
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echo "[INFO ] Auto update enabled by default" 1>&2
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fi
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case "$AUTO_UPDATE" in
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"on"|"yes"|"true"|1) AUTO_UPDATE="0";;
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"off"|"no"|"false"|0) AUTO_UPDATE="1";;
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*)
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echo "[ERROR] Invalid option for auto update: '$AUTO_UPDATE'" 1>&2
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exit 1
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;;
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esac
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## SET UP USED DIRECTORIES ##
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mkdir -p "$DATA_DIR"
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mkdir -p "$BUILD_META_DIR"
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mkdir -p "$SERVER_FD_DIR"
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## MAYBE (RE-)BUILD SERVER JAR ##
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build_check
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## MAYBE INITIALIZE SERVER FILES ##
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spigot_init
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## RUN SERVER JAR ##
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# prepare fds
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echo -n "" > "${SERVER_FD_DIR}/stdin"
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# switch into data directory
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pushd "$DATA_DIR" > /dev/null
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# start server process and stream its output
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java -jar server.jar < <(tail -fn 0 "${SERVER_FD_DIR}/stdin") | while IFS= read -r line; do
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echo "[LOG ] $line" 1>&2
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done & spigot_pid="$!"
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wait $spigot_pid
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