Added EULA environment variable

`-e EULA="true"` is now mandatory. Closes #59

Dockerfile

@@ -6,6 +6,7 @@ FROM alpine:latest
 # Environment variables
 ENV MC_VERSION="latest" \
     PAPER_BUILD="latest" \
+    EULA="false" \
     MC_RAM="" \
     JAVA_OPTS=""
 

README.md

@@ -8,7 +8,7 @@ It is assumed that the user has already acquired a working Docker installation.
 ## Command
 With this image, you can create a new PaperMC Minecraft server with one command (note that running said command indicates agreement to the Minecraft EULA). Here is an example:
 
-```sudo docker run -p 25565:25565 phyremaster/papermc```
+```sudo docker run -p 25565:25565 -e EULA="true" phyremaster/papermc```
 
 While this command will work just fine in many cases, it is only the bare minimum required to start a functional server and can be vastly improved by specifying some...
 ## Options
@@ -57,6 +57,11 @@ Environment variables are options that are specified in the format `-e <NAME>="<
   - If this is not set, the latest PaperMC build for the specified `MC_VERSION` will be used.
   - Changing this on an existing server will change the version *without wiping the server*.
   - `-e PAPER_BUILD="<latest>"`
+- EULA
+  - **Name:** `EULA`
+  - Set this to `true` to accept the Minecraft server EULA
+  - **The server will not start if this is not set to `true`**
+  - `-e EULA="true"`
 - RAM
   - **Name:** `MC_RAM`
   - Set this to the amount of RAM the server can use.

papermc.sh

@@ -34,17 +34,11 @@ then
   rm -f *.jar
   # Download new server jar
   wget "$URL" -O "$JAR_NAME"
-
-  # If this is the first run, accept the EULA
-  if [[ ! -e eula.txt ]]
-  then
-    # Run the server once to generate eula.txt
-    java -jar "$JAR_NAME"
-    # Edit eula.txt to accept the EULA
-    sed -i 's/false/true/g' eula.txt
-  fi
 fi
 
+# Update eula.txt with current setting
+echo "eula=${EULA:-false}" > eula.txt
+
 # Add RAM options to Java options if necessary
 if [[ -n $MC_RAM ]]
 then