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

update_bootloaders.sh

Index: update_bootloaders.sh
diff --git a/update_bootloaders.sh b/update_bootloaders.sh
index 2dbc138bbb5de66a852b44b560bcef806ef275c6..0b34172dcc3bb1305bfbd96f2879fe83db953e32 100755
--- a/update_bootloaders.sh
+++ b/update_bootloaders.sh
@@ -7,8 +7,33 @@
 # Helper script that generates the legacy/efi bootloader partitions.
 # It does not populate the templates, but can update a loop device.
 
-. "$(dirname "$0")/common.sh"
-. "$(dirname "$0")/chromeos-common.sh"  # installer
+# --- 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 ---
+
+# 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"
 
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