This starts to fix the scripts so that they load from /usr/lib/crosutils

bin/cros_sign_to_ssd

 #!/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.
 
 # Script to resign the kernel partition generated in the output of build_image
 # with SSD keys.
 
-# Load common constants.  This should be the first executable line.
-# The path to common.sh should be relative to your script's location.
-. "$(dirname "$0")/../common.sh"
+# --- BEGIN COMMON.SH BOILERPLATE ---
+# Load common CrOS utilities.  Inside the chroot this file is installed in
+# /usr/lib/crosutils.  Outside the chroot we find it relative to the script's
+# location.
+find_common_sh() {
+  local common_paths=(/usr/lib/crosutils "$(dirname "$(readlink -f "$0")")/..")
+  local path
 
-. "$(dirname "$0")/../chromeos-common.sh"  # for partoffset and partsize
+  SCRIPT_ROOT=
+  for path in "${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 ---
+
+# Need to be inside the chroot to load chromeos-common.sh
+assert_inside_chroot
+
+# Load functions and constants for chromeos-install
+. "/usr/lib/installer/chromeos-common.sh" || \
+  die "Unable to load /usr/lib/installer/chromeos-common.sh"
 
 locate_gpt
 
 DEFINE_string from "chromiumos_image.bin" \
   "Input file name of Chrome OS image to re-sign."
 
 # Parse command line
 FLAGS "$@" || exit 1
 eval set -- "${FLAGS_ARGV}"
 
@@ skipping 12 matching lines @@
   exit 1
 fi
 
 # Example commandline is as follows:
 # ./sign_official_build.sh \
 # ssd \
 # /.../build/images/x86-mario/0.8.68.2/chromiumos_test_image.bin \
 # ../../tests/devkeys/ \
 # /.../build/images/x86-mario/0.8.68.2/chromiumos_test_ssd_image.bin
 
-VBOOT_DIR="$(dirname "$0")/../../platform/vboot_reference"
+VBOOT_DIR="${SRC_ROOT}/platform/vboot_reference"
 if [ ! -d "${VBOOT_DIR}" ]; then
   die "VBOOT DIR NOT FOUND at \'${VBOOT_DIR}\' .."
 fi
 
 TMP_IMAGE=$(mktemp)
 VBOOT_KEYS="${VBOOT_DIR}/tests/devkeys"
 if [ ! -d "${VBOOT_KEYS}" ]; then
   die "VBOOT KEYS NOT FOUND at \'${VBOOT_KEYS}\' .."
 fi
 
 VBOOT_SIGN="${VBOOT_DIR}/scripts/image_signing/sign_official_build.sh"
 if [ ! -x "${VBOOT_SIGN}" ]; then
   die "VBOOT TOOL sign_official_build.sh NOT FOUND at \'${VBOOT_SIGN}\' .."
 fi
 
 cp "${FLAGS_from}" "${TMP_IMAGE}"
 
 ${VBOOT_SIGN} ssd "${TMP_IMAGE}" "${VBOOT_KEYS}" "${FLAGS_from}"
 
 rm "${TMP_IMAGE}"
 
 set +e
 trap - EXIT