build: Get rid of scary /dev/sdb defaults in scripts.

src/scripts/image_to_usb.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.
 
 # Script to convert the output of build_image.sh to a usb image.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
@@ skipping 59 matching lines @@
 if [ -z "${FLAGS_from}" ]; then
   IMAGES_DIR="${DEFAULT_BUILD_ROOT}/images/${FLAGS_board}"
   FLAGS_from="${IMAGES_DIR}/$(ls -t ${IMAGES_DIR} 2>&-| head -1)"
 fi
 
 if [ ! -d "${FLAGS_from}" ] ; then
   echo "Cannot find image directory ${FLAGS_from}"
   exit 1
 fi
 
-# If to isn't explicitly set
 if [ -z "${FLAGS_to}" ]; then
-  # Script can be run either inside or outside the chroot.
-  if [ ${INSIDE_CHROOT} -eq 1 ]
-  then
-    # Inside the chroot, we'll only output to a file, and we probably already
-    # have a valid image. Make the user specify a filename.
-    echo "ERROR: Inside the chroot, you must specify a --to FILE to create."
-    exit 1
-  else
-    # Outside the chroot, so output to the default device for a usb key.
-    FLAGS_to="/dev/sdb"
-  fi
+  echo "You must specify a file or device to write to using --to."
+  exit 1
 fi
 
 # Convert args to paths.  Need eval to un-quote the string so that shell
 # chars like ~ are processed; just doing FOO=`readlink -f ${FOO}` won't work.
 FLAGS_from=`eval readlink -f ${FLAGS_from}`
 FLAGS_to=`eval readlink -f ${FLAGS_to}`
 
 # Use this image as the source image to copy
 SRC_IMAGE="${FLAGS_from}/chromiumos_image.bin"
 
@@ skipping 123 matching lines @@
 
   echo "Copying ${SRC_IMAGE} to ${FLAGS_to}..."
   sudo dd if="${SRC_IMAGE}" of="${FLAGS_to}" bs=4M
 
   echo "Done."
 else
   # Output to a file, so just make a copy.
   echo "Copying ${SRC_IMAGE} to ${FLAGS_to}..."
   cp -f "${SRC_IMAGE}" "${FLAGS_to}"
 
-  echo "Done.  To copy to USB keyfob, outside the chroot, do something like:"
-  echo "   sudo dd if=${FLAGS_to} of=/dev/sdb bs=4M"
-  echo "where /dev/sdb is the entire keyfob."
+  echo "Done.  To copy to a USB drive, outside the chroot, do something like:"
+  echo "   sudo dd if=${FLAGS_to} of=/dev/sdX bs=4M"
+  echo "where /dev/sdX is the entire drive."
   if [ ${INSIDE_CHROOT} -eq 1 ]
   then
     example=$(basename "${FLAGS_to}")
     echo "NOTE: Since you are currently inside the chroot, and you'll need to"
     echo "run dd outside the chroot, the path to the USB image will be"
     echo "different (ex: ~/chromeos/trunk/src/build/images/SOME_DIR/$example)."
   fi
 fi