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

clean_loopback_devices

Index: clean_loopback_devices
diff --git a/clean_loopback_devices b/clean_loopback_devices
index 4fbb5549aa27c6307ec4b5f98a2efd196be9170c..acfe18919f46dfdbc535d9e117802bae084eeabc 100755
--- a/clean_loopback_devices
+++ b/clean_loopback_devices
@@ -1,3 +1,4 @@
+#!/bin/sh
 # 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.
@@ -7,9 +8,26 @@
 # failures.  This script only affects mountpoints and loopback devices
 # that were created within this chroot.
 
-# 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 "$0")"))
+  local path
+
+  SCRIPT_ROOT=
+  for path in "${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.
 assert_inside_chroot
@@ -24,8 +42,7 @@ OUTPUT_DIR="${FLAGS_output_root}/${FLAGS_board}"
 echo "This will unmount any directory under $OUTPUT_DIR:"
 read -p "Are you sure (y/N)? " SURE
 SURE="${SURE:0:1}" # Get just the first character
-if [ "${SURE}" != "y" ]
-then
+if [ "${SURE}" != "y" ]; then
   echo "Ok, better safe than sorry."
   exit 1
 fi