misc: Refactor writeEula

start-configuration

@@ -8,8 +8,7 @@ shopt -s nullglob
 export HOME=/data
 
 if [ ! -e /data/eula.txt ]; then
-  EULA="${EULA,,}"
-  if [ "$EULA" != "true" ]; then
+  if ! isTrue "$EULA"; then
     log ""
     log "Please accept the Minecraft EULA at"
     log "  https://account.mojang.com/documents/minecraft_eula"
@@ -19,12 +18,7 @@ if [ ! -e /data/eula.txt ]; then
     exit 1
   fi
 
-  echo "# Generated via Docker on $(date)" > /data/eula.txt
-
-  if ! echo "eula=$EULA" >> /data/eula.txt; then
-    log "ERROR: unable to write eula to /data. Please make sure attached directory is writable by uid=${UID}"
-    exit 2
-  fi
+  writeEula
 fi
 
 

start-utils

@@ -113,3 +113,12 @@ requireVar() {
     exit 1
   fi
 }
+
+function writeEula() {
+if ! echo "# Generated via Docker on $(date)
+eula=${EULA,,}
+" > /data/eula.txt; then
+  log "ERROR: unable to write eula to /data. Please make sure attached directory is writable by uid=${UID}"
+  exit 2
+fi
+}