devutil: since devserver.py is here, move the script here as well

host/start_devserver

+#!/bin/bash
+
+# Copyright (c) 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.
+
+# Start the Dev Server after making sure we are running under a chroot.
+
+# --- BEGIN COMMON.SH BOILERPLATE ---
+# Load common CrOS utilities.  Inside the chroot this file is installed in
+# /usr/lib/crosutils.  Outside the chroot we find it relative to the script's
+# location.
+find_common_sh() {
+  local common_paths=(/usr/lib/crosutils $(dirname "$(readlink -f "$0")"))
+  local path
+
+  SCRIPT_ROOT=
+  for path in "${common_paths[@]}"; do
+    if [ -r "${path}/common.sh" ]; then
+      SCRIPT_ROOT=${path}
+      break
+    fi
+  done
+}
+
+find_common_sh
+. "${SCRIPT_ROOT}/common.sh" || (echo "Unable to load common.sh" && exit 1)
+# --- END COMMON.SH BOILERPLATE ---
+
+# Script must be run inside the chroot if not in 'always serve' mode.
+if [[ "$1" != "--archive_dir" ]]; then
+  restart_in_chroot_if_needed "$@"
+fi
+
+# Temporary workaround: to start devserver for update engine, pass in args
+# --client_prefix ChromeOSUpdateEngine
+
+# Set PKG_INSTALL_MASK if it's not set already.
+if [ -z "${PKG_INSTALL_MASK+x}" ]; then
+  export PKG_INSTALL_MASK="${DEFAULT_INSTALL_MASK}"
+fi
+echo PKG_INSTALL_MASK=$PKG_INSTALL_MASK
+
+python /usr/bin/devserver.py "$@"