update_kernel: first cut at arm support

remote_access.sh

 # 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.
 
 # Library for setting up remote access and running remote commands.
 
 DEFAULT_PRIVATE_KEY="${GCLIENT_ROOT}/src/scripts/mod_for_test_scripts/\
 ssh_keys/testing_rsa"
 
 DEFINE_string remote "" "remote hostname/IP of running Chromium OS instance"
@@ skipping 48 matching lines @@
   [ -n "${FLAGS_board}" ] && return
   remote_sh grep CHROMEOS_RELEASE_BOARD /etc/lsb-release
   FLAGS_board=$(echo "${REMOTE_OUT}" | cut -d '=' -f 2)
   if [ -z "${FLAGS_board}" ]; then
     error "Board required"
     exit 1
   fi
   info "Target reports board is ${FLAGS_board}"
 }
 
+function learn_arch() {
+  [ -n "${FLAGS_arch}" ] && return
+  remote_sh uname -m
+  FLAGS_arch=$(echo "${REMOTE_OUT}" | sed s/armv7l/arm/g)
+  if [ -z "${FLAGS_arch}" ]; then
+    error "Arch required"
+    exit 1
+  fi
+  info "Target reports arch is ${FLAGS_arch}"
+}
+
 function remote_reboot {
   info "Rebooting."
   remote_sh "touch /tmp/awaiting_reboot; reboot"
   local output_file
   output_file="${TMP}/output"
 
   while true; do
     REMOTE_OUT=""
     # This may fail while the machine is down so generate output and a
     # boolean result to distinguish between down/timeout and real failure
@@ skipping 20 matching lines @@
 
 function remote_access_init() {
   TMP_PRIVATE_KEY=$TMP/private_key
   TMP_KNOWN_HOSTS=$TMP/known_hosts
   if [ -z "$FLAGS_remote" ]; then
     echo "Please specify --remote=<IP-or-hostname> of the Chromium OS instance"
     exit 1
   fi
   set_up_remote_access
 }