ip in docker-utils-0.1.35

- old
+ new

@@ -1,3 +1,28 @@
-#!/bin/bash
+#!/bin/sh
 
-command docker inspect --format '{{.NetworkSettings.IPAddress}}' "$1"
+mode="once"
+if [ "$1" = "-w" ]; then
+  mode="wait"; shift
+fi
+
+container_name="$1"; shift
+
+container_ip_addr=""
+
+if [ "${mode}" = "wait" ]; then
+  while :; do
+    container_ip_addr=$(command docker inspect --format '{{.NetworkSettings.IPAddress}}' "${container_name}" 2>/dev/null)
+    if [ -n "${container_ip_addr}" ]; then
+      break
+    fi
+    sleep 0.1
+  done
+else
+  container_ip_addr=$(command docker inspect --format '{{.NetworkSettings.IPAddress}}' "${container_name}" 2>/dev/null)
+fi
+
+if [ -n "${container_ip_addr}" ]; then
+  echo "${container_ip_addr}"
+else
+  exit 1
+fi