Add optional logging prefix to info, warn and error messages.

common.sh

 # 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.
 
 # 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 365 matching lines @@
   return $do_shift
 }
 
 V_RED="\e[31m"
 V_YELLOW="\e[33m"
 V_BOLD_GREEN="\e[1;32m"
 V_BOLD_RED="\e[1;31m"
 V_BOLD_YELLOW="\e[1;33m"
 
 function info {
-  echo -e >&2 "${V_BOLD_GREEN}INFO   : $1${V_VIDOFF}"
+  echo -e >&2  "${V_BOLD_GREEN}INFO    ${CROS_LOG_PREFIX:-""}: $1${V_VIDOFF}"
 }
 
 function warn {
-  echo -e >&2 "${V_BOLD_YELLOW}WARNING: $1${V_VIDOFF}"
+  echo -e >&2 "${V_BOLD_YELLOW}WARNING ${CROS_LOG_PREFIX:-""}: $1${V_VIDOFF}"
 }
 
 function error {
-  echo -e >&2   "${V_BOLD_RED}ERROR  : $1${V_VIDOFF}"
+  echo -e >&2    "${V_BOLD_RED}ERROR   ${CROS_LOG_PREFIX:-""}: $1${V_VIDOFF}"
 }
 
 function die {
   error "$1"
   exit 1
 }
 
 # Retry an emerge command according to $FLAGS_retries
 # The $EMERGE_JOBS flags will only be added the first time the command is run
 function eretry () {
@@ skipping 235 matching lines @@
     args="${args} --force_copy"
   fi
 
   # Modify the image for test, creating a new test image
   "${SCRIPTS_DIR}/mod_image_for_test.sh" --board=${FLAGS_board} \
     --image="$1/$2" --noinplace ${args}
 
   # From now on we use the just-created test image
   CHROMEOS_RETURN_VAL="$1/${CHROMEOS_TEST_IMAGE_NAME}"
 }