images/minecraft/mclauncher

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#!/bin/sh
set -e
#
# DEFAULT VARIABLE GENERATORS
#
jvm_args() {
MEMORY="${MEMORY:-1G}"
printf -- "-Xms$MEMORY -Xmx$MEMORY "
printf -- "-XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 "
printf -- "-XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch "
printf -- "-XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M "
printf -- "-XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 "
printf -- "-XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 "
printf -- "-XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem "
printf -- "-XX:MaxTenuringThreshold=1 "
}
#
# ENV VARS
#
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SERVER_DIR="$(realpath ${SERVER_DIR:-./server})"
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JVMARGS=${JVMARGS:-$(jvm_args)}
#
# PREDEFINE VARS
#
MCLAUNCHER_INFO=""
MCLAUNCHER_BINARY=""
MCLAUNCHER_QUIET=1
#
# HELPERS
#
error() {
printf '\x1b[31m[ERROR]\t\x1b[0m%s\n' "$*" > /dev/stderr
exit 1;
}
log() {
if [ "$MCLAUNCHER_QUIET" -eq 0 ]; then
printf '\x1b[0m[LOG]\t%s\n' "$*" > /dev/stderr
fi
}
step() {
if [ "$MCLAUNCHER_QUIET" -eq 0 ]; then
printf '\x1b[36m[STEP]\t\x1b[0m%s\n' "$*" > /dev/stderr
fi
}
get_key() {
echo "$MCLAUNCHER_INFO" | grep "$1=" | awk -F '=' '{ print $2 }'
}
#
# INFO STEP
# gets the up to date information from mcjar
#
info_step() {
step "info"
# getting latest info from mcjar
MCLAUNCHER_INFO="$(mcjar -a)"
[ "$MCLAUNCHER_QUIET" -eq 1 ] || echo "$MCLAUNCHER_INFO";
}
#
# BINARY STEP
# attempts to find the current binary installed on the system
#
binary_step_forge() {
jar_name="$(get_key "JAR_NAME")"
jar_prefix="${jar_name%-installer.jar}"
suffixs="$(echo ".jar;-shim.jar;-universal.jar" | tr ";" "\n")"
IFS=$'\n'
for suffix in $suffixs; do
if [ -f "$SERVER_DIR/$jar_prefix$suffix" ]; then
MCLAUNCHER_BINARY="$jar_prefix$suffix"
return;
fi
done
}
binary_step_default() {
jar_name="$(get_key "JAR_NAME")"
if [ -f "$SERVER_DIR/$jar_name" ]; then
MCLAUNCHER_BINARY="$jar_name"
fi
}
binary_step() {
step "binary"
MCLAUNCHER_BINARY=""
type="$(get_key "MC_TYPE")"
case "$type" in
"forge")
binary_step_forge
;;
*)
binary_step_default
;;
esac
if [ "$MCLAUNCHER_BINARY" != "" ]; then
log "found binary '$MCLAUNCHER_BINARY'"
else
log "could not locate binary... will download"
fi
}
#
# DOWNLOAD STEP
# download the binary if it needs to needs updated
#
download_step() {
step "download"
if [ "$MCLAUNCHER_BINARY" != "" ]; then
log "jar is up to date... skipping"
return;
fi
# clean up old files
rm -f "$SERVER_DIR"/*.jar
rm -f "$SERVER_DIR"/*.jar.log
rm -f "$SERVER_DIR"/*.bat
rm -f "$SERVER_DIR/run.sh"
# update the jar
log "jar is out of date... updating"
jar_url="$(get_key "JAR_URL")"
jar_name="$(get_key "JAR_NAME")"
log "downloading '$jar_url'"
wget -q "$jar_url" -O "$SERVER_DIR/$jar_name"
MCLAUNCHER_BINARY="$jar_name"
}
#
# INSTALL STEP
# some mc types need an extra install step to setup the server files before running
#
install_step_forge() {
log "installing forge server"
jar_name="$(get_key "JAR_NAME")"
java -jar "$SERVER_DIR/$jar_name" --installServer
binary_step_forge
if [ "$MCLAUNCHER_BINARY" = "" ]; then
error "could not locate forge binary"
fi
}
install_step() {
step "install"
type="$(get_key "MC_TYPE")"
case "$type" in
"forge")
install_step_forge
;;
*)
log "install step not needed for '$type'"
;;
esac
}
#
# EXECUTE STEP
# run the thing!!!!!!
#
execute_step_default() {
jar_name="$(get_key "JAR_NAME")"
exec java $JVMARGS -jar "$SERVER_DIR/$jar_name" nogui
}
execute_step_forge() {
if [ -f "$SERVER_DIR/run.sh" ]; then
echo "$JVMARGS" > "$SERVER_DIR/user_jvm_args.txt"
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{ chmod +x "$SERVER_DIR/run.sh" || true; }
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exec "$SERVER_DIR/run.sh" nogui
else
exec java $JVMARGS -jar "$SERVER_DIR/$MCLAUNCHER_BINARY" nogui
fi
}
execute_step() {
step "execute"
echo "eula=true" > "$SERVER_DIR/eula.txt"
type="$(get_key "MC_TYPE")"
case "$type" in
"forge")
execute_step_forge
;;
*)
execute_step_default
;;
esac
}
chk_command() {
if ! command -v "$1" > /dev/null; then
>&2 echo "error: command '$1' could not be found"
exit 1
fi
}
help() {
printf "usage: mclauncher [options]\n\n"
printf "options:\n"
printf "\t-h\tshow this message\n"
printf "\t-l\tshow logging (verbose)\n\n"
printf "environment:\n"
printf "\tsee 'mcjar -h' for environment\n"
}
chk_command mcjar
chk_command java
chk_command awk
chk_command getopts
while getopts "hl" arg 2>/dev/null; do
case "$arg" in
h)
help
exit 0
;;
l)
MCLAUNCHER_QUIET=0
;;
?)
error "unknown option"
;;
esac;
done;
mkdir -p "$SERVER_DIR"
cd "$SERVER_DIR"
info_step
binary_step
download_step
install_step
execute_step