From 6508963b84f2f2a163ac435bdea91804fcf140fb Mon Sep 17 00:00:00 2001
From: Flavio Fernandes <flavio.fernandes@ibm.com>
Date: Mon, 19 Dec 2016 18:06:26 -0600
Subject: [PATCH] entrypoint.sh: if interface was provided, wait for it to show
 up

---
 util/entrypoint.sh | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/util/entrypoint.sh b/util/entrypoint.sh
index 5d36133..6c6f983 100755
--- a/util/entrypoint.sh
+++ b/util/entrypoint.sh
@@ -3,6 +3,12 @@ set -e
 
 # Single argument to command line is interface name
 if [ -n "$1" ]; then
+    # loop until interface is found, or we give up
+    NEXT_WAIT_TIME=1
+    until [ -e "/sys/class/net/$1" ] || [ $NEXT_WAIT_TIME -eq 4 ]; do
+        sleep $(( NEXT_WAIT_TIME++ ))
+        echo "Waiting for $1 to become available.... ${NEXT_WAIT_TIME}"
+    done
     if [ -e "/sys/class/net/$1" ]; then
         IFACE=$1
     fi