Add ability to blacklist packages from chromeos-base/chromeos.

Change-Id: I05370137dbe9f9adc7b18f2ff77d1b7680275c37

BUG=7973
TEST=Ran with/without current blacklist file.  Also, added chromeos-base/chromeos-chrome
to test it actually dies correctly.

Review URL: http://codereview.chromium.org/4005002

build_image

@@ -97,6 +97,25 @@ if [ -z "${FLAGS_board}" ] ; then
   exit 1
 fi
 
+check_blacklist() {
+  info "Verifying that the base image does not contain a blacklisted package."
+  info "Generating list of packages for chromeos-base/chromeos."
+  local package_blacklist_file="${SCRIPTS_DIR}/chromeos_blacklist"
+  if [ ! -e "${package_blacklist_file}" ]; then
+    warn "Missing blacklist file."
+    return
+  fi
+  local blacklisted_packages=$(${SCRIPTS_DIR}/get_package_list \
+      --board="${FLAGS_board}" chromeos-base/chromeos \
+      | grep -x -f "${package_blacklist_file}")
+  if [ -n "${blacklisted_packages}" ]; then
+    die "Blacklisted packages found: ${blacklisted_packages}."
+  fi
+  info "No blacklisted packages found."
+}
+
+check_blacklist
+
 # Verify user didn't specify incompatible flags for dev install shim
 if [ "${FLAGS_factory_install}" -eq "${FLAGS_TRUE}" ] &&
    [ "${FLAGS_dev_install}" -eq "${FLAGS_TRUE}" ] ; then

chromeos_blacklist

@@ -0,0 +1,3 @@
+dev-lang/python
+dev-java/icedtea
+dev-java/icedtea6-bin

get_package_list

@@ -20,11 +20,13 @@ DEFINE_string board "$DEFAULT_BOARD" \
 
 # Parse flags.
 FLAGS "$@" || exit 1
+eval set -- "${FLAGS_ARGV}"
+
+[[ -z "${FLAGS_board}" ]] && die "A board must be specified."
 
 if [[ -z "${FLAGS_ARGV}" ]]; then
-  echo "Please specify package."
-  echo "Usage:  ./get_package_list.sh chromeos-base/chromeos > package.list"
-  exit 1
+  warn "Please specify package."
+  die "Usage:  ./get_package_list.sh chromeos-base/chromeos > package.list"
 fi
 
 emerge-$FLAGS_board --emptytree --usepkgonly -p -v --columns \