Change hostname to ip address if we can get it from ifconfig.

image_to_live.sh

 #!/bin/bash
 
 # Copyright (c) 2009-2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Script to update an image onto a live running ChromiumOS instance.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
@@ skipping 51 matching lines @@
   fi
   cleanup_remote_access
   rm -rf "${TMP}"
 }
 
 function remote_reboot_sh {
   rm -f "${TMP_KNOWN_HOSTS}"
   remote_sh "$@"
 }
 
+# Returns the hostname of this machine.
+# It tries to find the ipaddress using ifconfig, however, it will
+# default to $HOSTNAME on failure.  We try to use the ip address first as
+# some targets may have dns resolution issues trying to contact back
+# to us.
+function get_hostname {
+  local hostname
+  # Try to parse ifconfig for ip address
+  hostname=$(ifconfig eth0 \
+      | grep 'inet addr' \
+      | sed 's/.\+inet addr:\(\S\+\).\+/\1/') || hostname=${HOSTNAME}
+  echo ${hostname}
+}
+
 # Reinterprets path from outside the chroot for use inside.
 # $1 - The path to reinterpret.
 function reinterpret_path_for_chroot() {
   local path_abs_path=$(readlink -f "${1}")
   local gclient_root_abs_path=$(readlink -f "${GCLIENT_ROOT}")
 
   # Strip the repository root from the path.
   local relative_path=$(echo ${path_abs_path} \
       | sed s:${gclient_root_abs_path}/::)
 
@@ skipping 80 matching lines @@
     update_args="--update ${update_args}"
   fi
 
   echo "${update_args}"
 }
 
 function get_devserver_url {
   local devserver_url=""
   if [ ${FLAGS_ignore_hostname} -eq ${FLAGS_TRUE} ]; then
     if [ -z ${FLAGS_update_url} ]; then
-      devserver_url="http://$HOSTNAME:${FLAGS_devserver_port}/update"
+      devserver_url="http://$(get_hostname):${FLAGS_devserver_port}/update"
     else
       devserver_url="${FLAGS_update_url}"
     fi
   fi
   echo "${devserver_url}"
 }
 
 function truncate_update_log {
   remote_sh "> /var/log/update_engine.log"
 }
@@ skipping 175 matching lines @@
     local release_description=$(echo ${REMOTE_OUT} | cut -d '=' -f 2)
     info "Update was successful and rebooted to $release_description"
   fi
 
   print_time_elapsed
 
   exit 0
 }
 
 main $@