Make enter_chroot spew logs to stderr.

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 302 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 "${V_BOLD_GREEN}INFO   : $1${V_VIDOFF}"
+  echo -e >&2 "${V_BOLD_GREEN}INFO   : $1${V_VIDOFF}"
 } 
 
 function warn {
-  echo -e "${V_BOLD_YELLOW}WARNING: $1${V_VIDOFF}"
+  echo -e >&2 "${V_BOLD_YELLOW}WARNING: $1${V_VIDOFF}"
 }
 
 function error {
-  echo -e    "${V_BOLD_RED}ERROR  : $1${V_VIDOFF}"
+  echo -e >&2   "${V_BOLD_RED}ERROR  : $1${V_VIDOFF}"
 }
 
 function die {
   error "$1"
   exit 1
 }
 
 # Retry an emerge command according to $FLAGS_retries
 # The $EMERGE_JOBS flags will only be added the first time the command is run
 function eretry () {
@@ skipping 109 matching lines @@
 start_time=$(date +%s)
 
 # Print time elsapsed since start_time.
 print_time_elapsed() {
   end_time=$(date +%s)
   elapsed_seconds="$(( $end_time - $start_time ))"
   minutes="$(( $elapsed_seconds / 60 ))"
   seconds="$(( $elapsed_seconds % 60 ))"
   echo "Elapsed time: ${minutes}m${seconds}s"
 }