restart_in_chroot_if_needed can run scripts from bin/. cros_workon_now does this

bin/cros_workon_make

 #!/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.
 #
 # Simple wrapper script to build a cros_workon package incrementally.
 # You must already be cros_workon'ing the package in question.
 
 . "$(dirname $0)/../common.sh"
 
 # Script must be run inside the chroot.
-assert_inside_chroot
+restart_in_chroot_if_needed "$@"
 
 get_default_board
 
 DEFINE_string board "${DEFAULT_BOARD}" \
     "Board for which to build the package."
 DEFINE_boolean test "${FLAGS_FALSE}" \
   "Compile and run tests as well."
 DEFINE_boolean reconf "${FLAGS_FALSE}" \
   "Re-run configure and prepare steps."
 DEFINE_boolean install "${FLAGS_FALSE}" \
@@ skipping 66 matching lines @@
 fi
 
 clean=
 if [ "${FLAGS_reconf}" = "${FLAGS_TRUE}" ]; then
   clean="clean"
 else
   rm -f "/build/${BOARD_STR}/tmp/portage/${workpath}/.compiled"
 fi
 SANDBOX_WRITE=~/trunk CROS_WORKON_INPLACE=1 \
   "${EBUILDCMD}" "${pkgfile}" ${clean} "${to_do}"