From 598653a4cc89d5588315607a367a87083b73da7c Mon Sep 17 00:00:00 2001
From: Jonas Gunz <himself@jonasgunz.de>
Date: Sun, 4 Oct 2020 23:28:23 +0200
Subject: initial

---
 builder.sh | 187 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 runner.sh  | 109 +++++++++++++++++++++++++++++++++++
 2 files changed, 296 insertions(+)
 create mode 100755 builder.sh
 create mode 100755 runner.sh

diff --git a/builder.sh b/builder.sh
new file mode 100755
index 0000000..5f647f8
--- /dev/null
+++ b/builder.sh
@@ -0,0 +1,187 @@
+#!/bin/bash
+
+# Minecraft Java serverdir builder
+
+function fail(){
+	>&2 echo $@
+	exit 1
+}
+
+# 1: file 2: attribute
+function serverprop_get() {
+	sed -n "s/$2=\(.*\)$/\1/p" "$1"
+}
+
+# 1: file 2: attribute 3: value
+function serverprop_set() {
+	if grep -s "^$2=.*$" "$1"; then
+		sed -i "s/$2=.*$/$2=$3/g" "$1"
+	else
+		echo "$2=$3" >> "$1"
+	fi
+}
+
+function confirm() {
+	[ -z "$NO_INTERACTIVE" ] || return 1
+
+	read -p "$@ [y/N] " choice
+	case $choice in
+		[yY]*)
+			return 0;;
+		*)
+			return 1
+	esac
+}
+
+# Sub Commands
+
+## world
+
+function world() {
+	local CMD="$1"
+	case $CMD in
+		list) ;&
+		create) ;&
+		clone) ;&
+		backup) ;&
+		delete) ;&
+		assign)
+			shift
+			eval 'world_$CMD "$@"'
+			;;
+		*)
+			fail "world: Unknown argument $CMD"
+	esac
+
+	exit $?
+}
+
+function world_exists() {
+	[ -d "$WORLDS/$1" ]
+	return $?
+}
+
+# 1: world 2: instance
+function world_assign() {
+	local WORLD="$1"
+	local INSTANCE="$2"
+
+	world_exists "$WORLD" \
+		||  ( confirm "World not found. Create?" \
+		&& world_create "$WORLD" \
+		|| fail "World $WORLD not found." )
+
+	[ -f "$WORLDS/$WORLD.lock" ] && fail "$WORLD is already used by another instance."
+
+	echo "ASSIGNED_TO=\"$INSTANCE\"" > "$WORLDS/$WORLD.lock"
+
+	ln -s "$WORLDS/$WORLD" "$INSTANCES/$INSTANCE"
+	serverprop_set "$INSTANCES/$INSTANCE/server.properties" level-name "$WORLD"
+}
+
+
+# 1: name
+function world_create() {
+	world_exists "$1" && fail "World already exists"
+	mkdir "$WORLDS/$1"
+}
+
+## instance
+
+function instance() {
+	local CMD="$1"
+	case $CMD in
+		list) ;&
+		create) ;&
+		delete) ;&
+		start) ;&
+		stop) ;&
+		status)
+			shift
+			eval 'instance_$CMD "$@"'
+			;;
+		*)
+			fail "instance: Unknown argument $CMD"
+	esac
+
+	exit $?
+}
+
+function instance_exists() {
+	[ -d "$INSTANCES/$1" ]
+	return $?
+}
+
+# 1: name 2: world 3: version
+function instance_create() {
+	local NAME="$1"
+	local WORLD="$2"
+	local VERSION="$3"
+
+	instance_exists "$NAME" && fail "$NAME already exists."
+	mkdir "$INSTANCES/$NAME"
+
+	version_install "$NAME" "$VERSION"
+	confirm "Accept minecraft EULA?" && serverprop_set "$INSTANCES/$NAME/eula.txt" eula true
+
+	world_assign "$WORLD" "$NAME"
+}
+
+function instance_start() {
+	instance_exists "$1" || fail "instance $1 not found."
+
+
+	# TODO
+}
+
+## version
+
+function version() {
+	fail "not implemented"
+}
+
+function version_exists() {
+	[ -f "$VERSIONS/$1.jar" ]
+	return $?
+}
+
+# 1: instance 2: version
+function version_install() {
+	instance_exists "$1" || fail "instance $1 not found."
+	version_exists "$2" || fail "version $2 not found."
+
+	local PWD=$(pwd)
+	cd "$INSTANCES/$1"
+
+	[ -e "$2.jar" ] && rm "$2.jar"
+
+	ln -s "$VERSIONS/$2.jar" "$2.jar"
+
+	serverprop_set settings.sh MCJAR "$2.jar"
+
+	cd "$PWD"
+}
+
+# NO_INTERACTIVE=1
+
+PREFIX=$(pwd)
+VERSIONS="$PREFIX/versions"
+WORLDS="$PREFIX/worlds"
+INSTANCES="$PREFIX/instances"
+
+RUNNER="$PREFIX/runner.sh"
+
+[ -x ./settings.sh ] || fail "settings.sh not found."
+source ./settings.sh
+
+CMD="$1"
+case $CMD in
+	world) ;&
+	instance) ;&
+	version)
+		shift
+		eval '$CMD "$@"'
+		;;
+	*)
+		fail "Unknown option $1"
+esac
diff --git a/runner.sh b/runner.sh
new file mode 100755
index 0000000..1ec1fbc
--- /dev/null
+++ b/runner.sh
@@ -0,0 +1,109 @@
+#!/bin/bash
+
+# Minecraft Java runner script
+
+function stop() {
+	running || exit 0
+	test -p stdin || exit 1
+	echo stop > stdin
+
+	>&2 echo -n Waiting for server to stop
+	while kill -s 0 $PID > /dev/null 2>&1; do
+		sleep 1
+		>&2 echo -n .
+	done
+
+	>&2 echo Done!
+
+	rm server.pid stdin
+
+	exit 0
+}
+
+function start() {
+	running && fail "Server appears to already be running. PID: $PID"
+
+	[ -z "$JVMARGS" ] && echo 'WARNING: $JVMARGS not set'
+	[ -e stdin -a ! -p stdin ] && rm stdin
+
+	mkfifo stdin
+
+	"$JAVA" $JVMARGS -jar "$MCJAR" -nogui $MCARGS \
+		< <(while [ -p stdin ]; do timeout 10s cat stdin; done) \
+		> /dev/null &
+	PID=$!
+
+	echo $PID > server.pid
+	echo "Started server with PID $PID"
+
+	exit 0
+}
+
+function attach() {
+	running || fail "Server is not running."
+	
+	echo "CTRL-D (EOF) to exit."
+
+	tail -f logs/latest.log &
+	TAILPID=$!
+
+	while read line; do
+		echo "$line" > stdin
+	done
+
+	kill -s SIGKILL $TAILPID
+	
+	exit 0
+}
+
+function running() {
+	[ -e server.pid ] || return 1
+
+	PID=$(cat server.pid)
+	kill -s 0 $PID && return 0
+
+	rm server.pid stdin
+	return 1
+} > /dev/null 2>&1
+
+function fail() {
+	>&2 echo $@
+	exit 1
+}
+
+function stdin_redirector(){
+	while [ -p stdin ]; do
+		cat stdin
+	done
+}
+
+[ -e settings.sh ] && source settings.sh \
+	|| >&2 echo "WARNING: settings.sh not found."
+# settings.sh
+# JVMARGS, JAVA, MCARGS, MCJAR
+
+JAVA=${JAVA:-java}
+MCJAR=${MCJAR:-server.jar}
+
+which "$JAVA" > /dev/null 2>&1 || fail "No java executable."
+
+case $1 in
+	start)
+		start;;
+	stop)
+		stop;;
+	status)
+		running || fail "Server is not running."
+		>&2 echo "Server is running"
+		exit 0;;
+	attach)
+		attach;;
+	command)
+		running || fail "Server is not running."
+		shift
+		echo $@ > stdin;;
+	*)
+		>&2 echo "Minecraft Java server runner"
+		>&2 echo "$0 start|stop|status|attach|command ..."
+		fail "Invalid argument $1"
+esac
-- 
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