Add checks that the board and variant names don't contain underscores.

bin/cros_overlay_list

 #!/bin/bash
 
 # 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.
 
 # This script generates the list of board overlays and variants.
 
 # Load common constants.  This should be the first executable line.
 # The path to common.sh should be relative to your script's location.
@@ skipping 12 matching lines @@
 
 # Only now can we die on error.  shflags functions leak non-zero error codes,
 # so will die prematurely if 'set -e' is specified before now.
 set -e
 
 if [ -z "$FLAGS_board" ] ; then
   error "--board required."
   exit 1
 fi
 
+if [[ "$FLAGS_board" =~ "_" ]] ; then
+  error "--board name must not contain an underscore (_)."
+  exit 1
+fi
+
+if [[ "$FLAGS_variant" =~ "_" ]] ; then
+  error "--variant name must not contain an underscore (_)."
+  exit 1
+fi
+
 #
 # Check for chromeos-overlay.
 #
 CHROMEOS_OVERLAY="${SRC_ROOT}/private-overlays/chromeos-overlay"
 
 if [ -d "${CHROMEOS_OVERLAY}" ]; then
   echo "${CHROMEOS_OVERLAY}"
 fi
 
 #
@@ skipping 44 matching lines @@
     fi
   fi
 fi
 
 #
 # Finally, add in any user requested board overlays.
 #
 if [ -d "${FLAGS_board_overlay}" ] ; then
   echo "${FLAGS_board_overlay}"
 fi