set -uo pipefail

umask 077

TTY="/dev/$(ps -p $$ -o tty=)"

function die() { echo "error: $*" >&2; exit 1; }

function status() { echo "${had_status+$'\n'}$*"; had_status=1; }

function flush_stdin() { while read -r -t 0.01 empty_stdin < "$TTY"; do true; done; }

function ask() {

}

function install_file() {

}

abort=0

for i in jq git tmux rdiff-backup java openssl; do

if ! type "$i" &>/dev/null; then

echo "missing: $i" >&2

abort=1

fi

[[ "$abort" == "0" ]] \

|| die "Please install the missing tools first."

total_ram_gibi=$(free -g | grep -oP '\d+' | head -n1)

if [[ $total_ram_gibi -le 4 ]]; then

echo "Your system has ${total_ram_gibi}GiB of RAM, which probably is not enough to run minecraft"

echo "without issues. The recommended minimum amount is _at least_ 12GiB."

ask "Continue anyway?" || die "Installation aborted."

echo

elif [[ $total_ram_gibi -lt 12 ]]; then

echo "Your system has ${total_ram_gibi}GiB of RAM, which less than the recommended amount of"

echo "_at least_ 12GiB. This will hurt the server performance significantly."

ask "Continue anyway?" || die "Installation aborted."

echo

[[ $EUID == 0 ]] || die "Must be root for system-wide installation."

status "Agree to Mojang EULA"

echo "You have to agree to Mojang's EULA to use the server software."

echo "It is available here: https://account.mojang.com/documents/minecraft_eula"

ask "Do you agree to the EULA?" \

|| die "Installation aborted. EULA must be accepted to continue."

if ! getent passwd minecraft &>/dev/null; then

status "Creating minecraft user"

useradd --system --home-dir /var/lib/minecraft --no-create-home minecraft \

|| die "Could not create user 'minecraft'"

mkdir -p /var/lib/minecraft

chmod 700 /var/lib/minecraft

chown minecraft: /var/lib/minecraft

if [[ -e /var/lib/minecraft/deploy ]]; then

echo "The deploy directory /var/lib/minecraft/deploy already exists."

echo "You can still run the installer again, but it may overwrite some"

echo "configuration files if you edited them in the meantime."

ask "Are you sure you want to continue?" \

|| die "Installation aborted."

cd /var/lib/minecraft \

|| die "Could not change into /var/lib/minecraft"

if [[ -e deploy ]]; then

status "Updating deploy repository"

runuser -u minecraft -- git -C deploy pull \

|| die "Could not pull repository"

status "Cloning deploy repository"

runuser -u minecraft -- git clone "https://github.com/oddlama/minecraft-server" deploy \

|| die "Could not clone repository"

cd deploy \

|| die "Could not change into deploy directory"

status "Configuring server"

install_file <(echo "eula=true") server/eula.txt minecraft: 600

for d in $(find contrib/default_config -type d -printf '%P\n'); do

mkdir -p -m700 "$d" || die "Could not create directory '$d'"

chown minecraft: "$d" || die "Could not chown directory '$d'"

for f in $(find contrib/default_config -type f -printf '%P\n'); do

install_file contrib/default_config/"$f" "$f" minecraft: 600

VELOCITYSECRET=$(openssl rand -base64 16) \

|| die "Could not generate velocity secret"

install_file <(echo -n "$VELOCITYSECRET") proxy/forwarding.secret minecraft: 600

sed -i 's|{{VELOCITYSECRET}}|'"$VELOCITYSECRET"'|' server/config/paper-global.yml \

|| die "Could not insert velocity secret in paper-global.yml"

echo "Depending on your player base, you might want to allow certain gamplay"

echo "exploits on your server. These are fixed by default in PaperMC, but would"

echo "allow your players to build certain vanilla machines (TNT blast chambers,"

echo "bedrock removal, ...). My personal recommendation is to answer with yes"

echo "to all of these questions."

if ask "Allow headless pistons and bedrock breaking?"; then

sed -i 's|allow-headless-pistons: false|allow-headless-pistons: true|' server/config/paper-global.yml \

|| die "Could not replace allow-headless-pistons config"

sed -i 's|allow-permanent-block-break-exploits: false|allow-permanent-block-break-exploits: true|' server/config/paper-global.yml \

|| die "Could not replace allow-permanent-block-break-exploits config"

if ask "Allow piston TNT duping?"; then

sed -i 's|allow-piston-duplication: false|allow-piston-duplication: true|' server/config/paper-global.yml \

|| die "Could not replace allow-piston-duplication config"

if ask "Enable Anti-XRAY?"; then

sed -i 's|false # ANTI_XRAY|true|' server/config/paper-world-defaults.yml \

|| die "Could not replace ANTI_XRAY config"

sed -i 's|false # ANTI_XRAY|false|' server/config/paper-world-defaults.yml \

|| die "Could not replace ANTI_XRAY config"

if ask "Replenish loot in loot chests after 1-2 realtime days?"; then

sed -i 's|auto-replenish: false|auto-replenish: true|' server/config/paper-world-defaults.yml \

|| die "Could not replace auto-replenish config"

if ask "Disable hopper item move event to reduce lag?"; then

sed -i 's|disable-move-event: false|disable-move-event: true|' server/config/paper-world-defaults.yml \

|| die "Could not replace disable-move-event config"

if ask "Increase view-distance to 15 chunks?"; then

sed -i 's|view-distance=10|view-distance=15|' server/server.properties \

|| die "Could not replace view-distance config"

runuser -u minecraft -- ./update.sh < "$TTY" \

|| die "Could not update server files"

status "Installing service files"

./contrib/install.sh < "$TTY" \

|| die "Error while installing service files"

status "Starting services ..."

echo "System services for the proxy and server will now be enabled and started."

echo "If you want to adjust any proxy related configuration, you may want to start"

echo "them manually later."

postponed_service_message=""

if ask "Enable and start system services now?"; then

systemctl enable --now minecraft-server minecraft-proxy < "$TTY" \

|| die "Error while enabling services"

postponed_service_message="

cat <<EOF