Update hostman script.

hostman.sh

@@ -1,31 +1,43 @@
 #!/usr/bin/env sh
 # Configurable Variables
-DOCKER_SOCK_PATH="/tmp/docker.sock"
-HOST_CONF_PATH="/tmp/hosts"
-NETWORK_NAME="proxy"
+[ -z $DOCKER_SOCK_PATH ] && DOCKER_SOCK_PATH="/tmp/docker.sock"
+[ -z $NETWORK_NAME ] && NETWORK_NAME="proxy"
+[ -z $RESOLVE_DOCKERHOST ] && RESOLVE_DOCKERHOST=false
+[ -z $HOST_CONF_PATH ] && HOST_CONF_PATH="/tmp/hosts"
+[ -z $DOCKER_HOSTNAME_VAR ] && DOCKER_HOSTNAME_VAR="VIRTUAL_HOST"
 
 query_docker () {
     echo $(curl --unix-socket $DOCKER_SOCK_PATH --silent -g http://v1.41/$1/json$2)
 }
 
-while true
-do
+get_host_list() {
     PROXY_HOST_CONF=""
     CONTAINER_LIST=$(query_docker "containers" "?filters={%22network%22:[%22${NETWORK_NAME}%22],%22status%22:[%22running%22]}" | jq -cr '.[].Id')
 
     for id in $CONTAINER_LIST
     do
-        # Query individual container to access Env variables
+        # Query individual container to access relevant data
+        CONTAINER_DATA=$(query_docker "containers/${id}")
+        if $RESOLVE_LOCALHOST
+        then
+            HOST_IP=$(echo $CONTAINER_DATA | jq -cr '.NetworkSettings.Networks.proxy.IPAddress')
+        else
+            HOST_IP="127.0.0.1"
+        fi
         # Filter Env for HOSTNAME, remove list parenthesis and split/only keep values
-        HOST_NAMES=$(query_docker "containers/${id}" | jq -cr '.Config.Env[] | select(contains("VIRTUAL_HOST=")) | split("=")[1]')
+        HOST_NAMES=$(echo $CONTAINER_DATA | jq -cr ".Config.Env[] | select(contains(\"$DOCKER_HOSTNAME_VAR=\")) | split(\"=\")[1]")
 
         for hostname in $HOST_NAMES
         do
-            PROXY_HOST_CONF="$PROXY_HOST_CONF\n127.0.0.1 $hostname # Added by hostman"
+            PROXY_HOST_CONF="$PROXY_HOST_CONF\n$HOST_IP $hostname # Added by hostman"
         done
     done
+    echo $PROXY_HOST_CONF
+}
 
+while true
+do
     FILTERED_HOSTS=$(grep -ve "# Added by hostman$" $HOST_CONF_PATH)
-    echo -e "$FILTERED_HOSTS$PROXY_HOST_CONF" > $HOST_CONF_PATH
+    echo -e "$FILTERED_HOSTS$(get_host_list)" > $HOST_CONF_PATH
     sleep 10
 done