au: Fix octal-looking version number handling in memento_updater.sh.

src/platform/memento_softwareupdate/memento_updater.sh

 #!/bin/bash
 
 # Copyright (c) 2009 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.
 
 # This is the autoupdater for Memento. When called it consults Omaha to see
 # if there's an update available. If so, it downloads it to the other
 # partition on the Memento USB stick, then alters the MBR and partitions
 # as needed so the next reboot will boot into the newly installed partition.
@@ skipping 172 matching lines @@
 else
   # either checksum mismatch or ran out of space.
   log checksum mismatch or other error \
       calculated checksum: "$CALCULATED_CS" reference checksum: "$CHECKSUM" \
       return codes: "$RETURNED_CODES" expected codes: "$EXPECTED_CODES"
   # zero-out installation partition
   dd if=/dev/zero of=$INSTALL_DEV bs=4096 count=1
   exit 1
 fi
 
+# Return 0 if $1 > $2.
+# $1 and $2 are in "a.b.c.d" format where a, b, c, and d are base 10.
 function version_number_greater_than {
-  # return 0 if $1 > $2
-  # Assumes $1, $2 are in "a.b.c.d" format where a, b, c, d are base 10
-  EXPANDED_A=$(printf '%020d%020d%020d%020d' $(echo "$1" | sed 's/\./ /g' ))
-  EXPANDED_B=$(printf '%020d%020d%020d%020d' $(echo "$2" | sed 's/\./ /g' ))
+  # Replace periods with spaces and strip off leading 0s (lest numbers be
+  # interpreted as octal).
+  REPLACED_A=$(echo "$1" | sed -r 's/(^|\.)0*/ /g')
+  REPLACED_B=$(echo "$2" | sed -r 's/(^|\.)0*/ /g')
+  EXPANDED_A=$(printf '%020d%020d%020d%020d' $REPLACED_A)
+  EXPANDED_B=$(printf '%020d%020d%020d%020d' $REPLACED_B)
   # This is a string compare:
   [[ "$EXPANDED_A" > "$EXPANDED_B" ]]
 }
 
 # it's best not to interrupt the script from this point on out, since it
 # should really be doing these things atomically. hopefully this part will
 # run rather quickly.
 
 # tell the new image to make itself "ready"
 log running postinst on the downloaded image
@@ skipping 60 matching lines @@
                           -e "s/\(${LOCAL_DEV//\//\\/} .*\), bootable/\1/" \
   > "$LAYOUT_FILE"
 sfdisk --force $ROOT_DEV < "$LAYOUT_FILE" 2>&1 | cat >> "$MEMENTO_AU_LOG"
 abort_update_if_cmd_failed
 
 # mark update as complete so we don't try to update again
 touch "$UPDATED_COMPLETED_FILE"
 
 # tell user to reboot
 log Autoupdate applied. You should now reboot