Move is_whitelisted to the common script so that all users get the previous fix

src/scripts/common.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.
 
 # Common constants for build scripts
 # This must evaluate properly for both /bin/bash and /bin/sh
 
 # All scripts should die on error unless commands are specifically excepted
 # by prefixing with '!' or surrounded by 'set +e' / 'set -e'.
 # TODO: Re-enable this once shflags is less prone to dying.
@@ skipping 172 matching lines @@
   # Positional parameters from calling script.  :? means "fail if unset".
   PKG_NAME=${1:?}
   shift
 
   if [ -z `which $PKG_NAME` ]
   then
     echo "Can't find $PKG_NAME; attempting to install it."
     sudo apt-get --yes --force-yes install $PKG_NAME
   fi
 }
+
+# Returns true if the input file is whitelisted.
+#
+# $1 - The file to check
+is_whitelisted() {
+  local file=$1  
+  local whitelist="$FLAGS_whitelist"
+  test -f "$whitelist" || (echo "Whitelist file missing ($whitelist)" && exit 1)
+
+  local checksum=$(md5sum "$file" | awk '{ print $1 }')
+  local count=$(sed -e "s/#.*$//" "${whitelist}" | grep -c "$checksum" \
+                || /bin/true)
+  test $count -ne 0
+}