cache tags of submodules, load_env function

scripts/functions.sh

@@ -0,0 +1,28 @@
+function load_env {
+    FILE=.env
+    if [ "$BBB_DOCKER_DEV" = "1" ]; then
+        FILE=dev.env
+    else
+        FILE=.env
+    fi
+
+    if [ -f $FILE ]
+    then
+        export $(cat $FILE | sed 's/#.*//g' | grep -v "WELCOME_FOOTER" | grep -v "WELCOME_MESSAGE" | grep -v "CLIENT_TITLE" | xargs)
+    fi
+}
+
+function ensure_submodules {
+    MISSING_SUBMODULES=$(git submodule status | grep -v ' (' |  awk '{print $2}' || /bin/true)
+    echo 
+    if [ ! -z "$MISSING_SUBMODULES" ]; then
+        echo "ERROR: following submodules are not checked out. we can't continue here"
+        git submodule status | grep -v ' (' |  awk '{print " -", $2}'
+        echo ""
+        echo "if you really want to build images by yourself (not required for a normal production setup), use following command to check out all the submodules and try again"
+        echo "  git submodule update --init"
+        exit 1
+    fi
+    
+}
+