Only kill the dev server when it is started by image_to_live process.

src/scripts/image_to_live.sh

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 . "$(dirname $0)/common.sh"
 . "$(dirname $0)/remote_access.sh"
 
 DEFINE_boolean ignore_version ${FLAGS_TRUE} \
   "Ignore existing version on running instance and always update"
 DEFINE_boolean ignore_hostname ${FLAGS_TRUE} \
   "Ignore existing AU hostname on running instance use this hostname"
 DEFINE_boolean update_known_hosts ${FLAGS_FALSE} \
   "Update your known_hosts with the new remote instance's key"
 DEFINE_boolean verbose ${FLAGS_FALSE} \
   "Whether to output verbose information for debugging."
 DEFINE_integer devserver_port 8080 \
   "Port to use for devserver"
 DEFINE_string update_url "" "Full url of an update image"
 
 function kill_all_devservers {
+  echo "Killing dev server."
   # Using ! here to avoid exiting with set -e is insufficient, so use
   # || true instead.
   sudo pkill -f devserver\.py || true
 }
 
 function cleanup {
-  echo "Killing dev server."
-  kill_all_devservers
+  if [ -z "${FLAGS_update_url}" ]; then
+    kill_all_devservers
+  fi
   cleanup_remote_access
   rm -rf "${TMP}"
 }
 
 function remote_reboot_sh {
   rm -f "${TMP_KNOWN_HOSTS}"
   remote_sh "$@"
 }
 
 function start_dev_server {
@@ skipping 176 matching lines @@
   fi
 
   remote_sh "grep ^CHROMEOS_RELEASE_DESCRIPTION= /etc/lsb-release"
   local release_description=$(echo $REMOTE_OUT | cut -d '=' -f 2)
   echo "Update was successful and rebooted to $release_description"
 
   return 0
 }
 
 main $@