Allow active network interface to be overriden

projects/kubernetes-sigs/image-builder/build/setup_packer_configs.sh

@@ -152,20 +152,24 @@ env_and_envsubst '$EKSD_NAME' \
 if [ "$IMAGE_FORMAT" = "ova" ] && \
     ( [ "$IMAGE_OS" = "redhat" ] || ( [ "$IMAGE_OS" = "ubuntu" ] && [ "$IMAGE_OS_VERSION" != "2004" ] )  ); then
     echo "Finding correct interface for packer temporary http server"
-    ACTIVE_INTERFACE=""
-    if [ "$(uname -s)" = "Linux" ]; then
-        INTERFACES=($(ls /sys/class/net))
-        for interface in "${INTERFACES[@]}"; do
-            if [ "$interface" = "eth0" ] || [ "$interface" = "en0" ] || [ "$interface" = "eno1" ]; then
-                ACTIVE_INTERFACE=$interface
-                echo "Found interface: $interface"
-                break
-            fi
-        done
+    ACTIVE_INTERFACE="${EKSA_PACKER_ACTIVE_INTERFACE:-}"
+    if [ -z $ACTIVE_INTERFACE ]; then
+        if [ "$(uname -s)" = "Linux" ]; then
+            INTERFACES=($(ls /sys/class/net))
+            for interface in "${INTERFACES[@]}"; do
+                if [ "$interface" = "eth0" ] || [ "$interface" = "en0" ] || [ "$interface" = "eno1" ]; then
+                    ACTIVE_INTERFACE=$interface
+                    echo "Found interface: $interface"
+                    break
+                fi
+            done
+            HTTP_SERVER_IP=$(ip a l $ACTIVE_INTERFACE | awk '/inet / {print $2}' | cut -d/ -f1)
+        elif [ "$(uname -s)" = "Darwin" ]; then
+            ACTIVE_INTERFACE="en0"
+            HTTP_SERVER_IP=$(ifconfig $ACTIVE_INTERFACE | awk '/inet / {print $2}' | cut -d/ -f1)
+        fi
+    else
         HTTP_SERVER_IP=$(ip a l $ACTIVE_INTERFACE | awk '/inet / {print $2}' | cut -d/ -f1)
-    elif [ "$(uname -s)" = "Darwin" ]; then
-        ACTIVE_INTERFACE="en0"
-        HTTP_SERVER_IP=$(ifconfig $ACTIVE_INTERFACE | awk '/inet / {print $2}' | cut -d/ -f1)
     fi
 
     if [ -z $ACTIVE_INTERFACE ]; then