Ignore packages that cannot be found for the target.

cros_run_unit_tests

 #!/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 builds and runs Chromium OS unit tests.  Note that this script
 # utilizes the src_test stanza in chromeos-base packages.  These stanzas
 # should both build and run the unit tests.
 
@@ skipping 40 matching lines @@
 FLAGS_HELP="usage: ${0} [flags]"
 FLAGS "${@}" || exit 1
 eval set -- "${FLAGS_ARGV}"
 check_flags_only_and_allow_null_arg "${@}" && set --
 
 set -e
 
 [ -z "${FLAGS_board}" ] && die "--board required"
 
 # Create package list from package file and list of packages.
-[ -n "${FLAGS_package_file}" ] && PACKAGE_LIST="$(cat ${FLAGS_package_file})"
+if [ -n "${FLAGS_package_file}" ]; then
+  if [ -f "${FLAGS_package_file}" ]; then
+    PACKAGE_LIST="$(cat ${FLAGS_package_file})"
+  else
+    warn "Missing package file."
+  fi
+fi
+
 [ -n "${FLAGS_packages}" ] && PACKAGE_LIST="${PACKAGE_LIST} ${FLAGS_packages}"
 
 # If we didn't specify packages, find all packages.
 if [ -z "${FLAGS_package_file}" -a -z "${FLAGS_packages}" ]; then
   PACKAGE_LIST=$( ./get_package_list chromeos --board="${FLAGS_board}" |
                   egrep '^chromeos-base' )
 fi
 
 BLACK_LIST_FILE="$(dirname "$0")/unit_test_black_list.txt"
 
 for package in ${PACKAGE_LIST}; do
   if grep -xq "${package}" "${BLACK_LIST_FILE}"; then
     warn "Skipping package ${package} since it is blacklisted."
     continue
   fi
-  EBUILD_PATH=$( equery-${FLAGS_board} which ${package} 2> /dev/null )
+  EBUILD_PATH=$( equery-${FLAGS_board} which ${package} 2> /dev/null ) || \
+    warn "${package} not found"
   if [ -n "${EBUILD_PATH}" ]; then
     if check_src_test "${EBUILD_PATH}"; then
       run_unit_test "${EBUILD_PATH}" || record_test_failure "${package}"
     else
       NO_UNITTESTS="${NO_UNITTESTS} ${package}"
     fi
     TEST_COUNT=$(( TEST_COUNT + 1 ))
   fi
 done
 
 if [ -n "${NO_UNITTESTS}" ]; then
   warn "The following packages have no unit tests:"
   warn "${NO_UNITTESTS}"
 fi
 
 if [ ${TEST_FAILURES} -ne 0 ]; then
   error "Run completed with ${TEST_FAILURES}/${TEST_COUNT} test failures."
   error "Following packages had failing tests:"
   die "${FAILED_PACKAGES}"
 else
   info "All unit tests passed."
 fi