Added option to set ChromeOS version name, track and AU/dev server URLs via environment variables

chromeos_version.sh

 #!/bin/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.
 
 # ChromeOS version information
 #
 # This file is usually sourced by other build scripts, but can be run
 # directly to see what it would do.
@@ skipping 39 matching lines @@
   export CHROMEOS_VERSION_AUSERVER="https://tools.google.com/service/update2"
   export CHROMEOS_VERSION_DEVSERVER=""
 elif [ "$USER" = "chrome-bot" ]
 then
   # Continuous builder
   # Sets the codename to the user who built the image. This
   # will help us figure out who did the build if a different
   # person is debugging the system.
   export CHROMEOS_VERSION_CODENAME="$USER"
 
-  export CHROMEOS_VERSION_NAME="Chromium OS"
-  export CHROMEOS_VERSION_TRACK="buildbot-build"
-  export CHROMEOS_VERSION_AUSERVER="http://$HOSTNAME:8080/update"
-  export CHROMEOS_VERSION_DEVSERVER="http://$HOSTNAME:8080"
+  export CHROMEOS_VERSION_NAME=${CHROMEOS_VERSION_NAME:-"Chromium OS"}
+  export CHROMEOS_VERSION_TRACK=${CHROMEOS_VERSION_TRACK:-"buildbot-build"}
+  export CHROMEOS_VERSION_AUSERVER=${CHROMEOS_VERSION_AUSERVER:-"http://$HOSTNAME:8080/update"}
+  export CHROMEOS_VERSION_DEVSERVER=${CHROMEOS_VERSION_DEVSERVER:-"http://$HOSTNAME:8080"}
 else
   # Developer hand-builds
   # Sets the codename to the user who built the image. This
   # will help us figure out who did the build if a different
   # person is debugging the system.
   export CHROMEOS_VERSION_CODENAME="$USER"
 
-  export CHROMEOS_VERSION_NAME="Chromium OS"
-  export CHROMEOS_VERSION_TRACK="developer-build"
-  export CHROMEOS_VERSION_AUSERVER="http://$HOSTNAME:8080/update"
-  export CHROMEOS_VERSION_DEVSERVER="http://$HOSTNAME:8080"
+  export CHROMEOS_VERSION_NAME=${CHROMEOS_VERSION_NAME:-"Chromium OS"}
+  export CHROMEOS_VERSION_TRACK=${CHROMEOS_VERSION_TRACK:-"developer-build"}
+  export CHROMEOS_VERSION_AUSERVER=${CHROMEOS_VERSION_AUSERVER:-"http://$HOSTNAME:8080/update"}
+  export CHROMEOS_VERSION_DEVSERVER=${CHROMEOS_VERSION_DEVSERVER:-"http://$HOSTNAME:8080"}
   # Overwrite CHROMEOS_VERSION_PATCH with a date string for use by auto-updater
   export CHROMEOS_VERSION_PATCH=$(date +%Y_%m_%d_%H%M)
 fi
 
 # Version string. Not indentied to appease bash.
 export CHROMEOS_VERSION_STRING=\
 "${CHROMEOS_VERSION_MAJOR}.${CHROMEOS_VERSION_MINOR}"\
 ".${CHROMEOS_VERSION_BRANCH}.${CHROMEOS_VERSION_PATCH}"
 
 # Set CHROME values (Used for releases) to pass to chromeos-chrome-bin ebuild
 # URL to chrome archive
 export CHROME_BASE=
 # export CHROME_VERSION from incoming value or NULL and let ebuild default
 export CHROME_VERSION="$CHROME_VERSION"
 
 # Print (and remember) version info.
 echo "ChromeOS version information:"
 logvers="/tmp/version_${CHROMEOS_VERSION_STRING}"
 env | egrep '^CHROMEOS_VERSION|CHROME_' | tee $logvers | sed 's/^/    /'