use env var for target protocol

Dockerfile

@@ -5,4 +5,6 @@ RUN apt update && apt -y --no-install-recommends install \
 
 WORKDIR /usr/src/app
 COPY ./gateway-monitor.sh ./
+
+ENV TARGET_PROTOCOL babel
 CMD ["/usr/src/app/gateways-monitor.sh"]

gateway-monitor.sh

@@ -5,14 +5,14 @@ source /usr/src/app/route-plans
 
 while read dst others
 do
-    if [[ "$dst" == "10.198.0."* ]] && [[ "$others" == *"proto babel"* ]]
+    if [[ "$dst" == "10.198.0."* ]] && [[ "$others" == *"proto $TARGET_PROTOCOL"* ]]
     then
         # 读 babeld 路由
         declare -A routes
         while read -r dst others
         do
             routes["$dst"]="$others"
-        done < <( ip route show proto babel root 10.198.0.0/24 )
+        done < <( ip route show proto $TARGET_PROTOCOL root 10.198.0.0/24 )
 
         # 取最优路由并写进系统路由表
         # 这个循环内所有 echo 的东西都会打给 iproute2。打调试信息要用 stderr