CheckEula.sh

#!/bin/bash
#
# Copyright 2015 Google
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

if [ -a /minecraft/eula.txt ] && grep -qi true /minecraft/eula.txt && echo $EULA | grep -qi true; then
    echo "EULA already accepted!";
elif echo $EULA | grep -qi true; then
    echo "EULA accepted by docker run -e"
    echo "# EULA accepted on $(date) by docker run -e" > /minecraft/eula.txt
    echo "eula=$EULA" >> /minecraft/eula.txt
else
    echo ""
    echo "Please accept the Minecraft EULA hosted at"
    echo "  https://account.mojang.com/documents/minecraft_eula"
    echo "by adding ' -e EULA=TRUE' after 'docker run'"
    echo ""
    > /minecraft/eula.txt
    exit 1
fi