Added new env variable FACTORIO_WAITING

This is for a new feature that is being prepared :)

Dockerfile

@@ -15,7 +15,8 @@ ENV FACTORIO_AUTOSAVE_INTERVAL=2 \
     FACTORIO_NO_AUTO_PAUSE=false \
     FACTORIO_LATENCY_MS=100 \
     VERSION=0.12.35 \
-    FACTORIO_SHA1=ea15636469148662c26786ad916ac066ee5aab56
+    FACTORIO_SHA1=ea15636469148662c26786ad916ac066ee5aab56 \
+    FACTORIO_WAITING=false
 
 RUN apk --update add bash curl && \
     curl -sSL --cacert /opt/factorio.crt https://www.factorio.com/get-download/$VERSION/headless/linux64 -o /tmp/factorio_headless_x64_$VERSION.tar.gz && \

README.md

@@ -105,6 +105,11 @@ docker run -d \
   zopanix/factorio
 
 ```
+
+#### Waiting for ready
+This is a beta feature which has nothing to do with factorio... leave it as it is for the moment. I'm working with some collegues on something new which should work very well and please a lot of people.
+
+More to come
 If some can explain it, please make a PR :-)
 ### ToDo's
 * Add cutom savename for people with a lot of saves

smart_launch.sh

@@ -1,5 +1,13 @@
 #!/bin/bash
-
+# Checking if server is ready
+if [ $FACTORIO_WAITING == true ]
+then
+  until [ -f /opt/factorio/saves/ready ]
+  do
+    echo "# Waiting for backup daemon to be ready"
+    sleep 1
+  done
+fi
 if [ -f /opt/factorio/saves/save.zip ]
 then
   echo "###"