This starts to fix the scripts so that they load from /usr/lib/crosutils

cros_mark_branch_as_stable

Index: cros_mark_branch_as_stable
diff --git a/cros_mark_branch_as_stable b/cros_mark_branch_as_stable
index a2dfd7a6932d49d66a06235a55f480e0cce00258..e5382354194efb7ba3a3756976107874cab5ffd7 100755
--- a/cros_mark_branch_as_stable
+++ b/cros_mark_branch_as_stable
@@ -27,9 +27,26 @@
 #
 # Example usage: ./cros_mark_branch_as_stable
 
-# Load common constants.  This should be the first executable line.
-# The path to common.sh should be relative to your script's location.
-. "$(dirname "$0")/common.sh"
+# --- BEGIN COMMON.SH BOILERPLATE ---
+# Load common CrOS utilities.  Inside the chroot this file is installed in
+# /usr/lib/crosutils.  Outside the chroot we find it relative to the script's
+# location.
+find_common_sh() {
+  local common_paths=(/usr/lib/crosutils $(dirname "$(readlink -f "$0")"))
+  local path
+
+  SCRIPT_ROOT=
+  for path in "${common_paths[@]}"; do
+    if [ -r "${path}/common.sh" ]; then
+      SCRIPT_ROOT=${path}
+      break
+    fi
+  done
+}
+
+find_common_sh
+. "${SCRIPT_ROOT}/common.sh" || (echo "Unable to load common.sh" && exit 1)
+# --- END COMMON.SH BOILERPLATE ---
 
 function is_workon() { xargs grep -lE '^inherit.*cros-workon'; }
 function is_stable() { xargs grep -lE '^KEYWORDS=[^~]*$'; }
@@ -38,8 +55,8 @@ function is_unstable() { xargs grep -lE '^KEYWORDS=.*~'; }
 function get_workon_commit() {
   # Get the latest workon commit associated with an ebuild.
   ebuild="$1"
-  dir=$(dirname $ebuild)
-  CATEGORY=$(basename $(dirname "$dir"))
+  dir=$(dirname "$ebuild")
+  CATEGORY=$(basename "$(dirname "$dir")")
   CROS_WORKON_LOCALNAME=$(basename "$dir")
   CROS_WORKON_SUBDIR=
 
@@ -65,7 +82,7 @@ function get_workon_commit() {
   cd $SRCDIR && git rev-parse HEAD
 }
 
-BLACKLIST_FILE=$(dirname "$0")/cros_mark_as_stable_blacklist
+BLACKLIST_FILE="${SCRIPTS_DIR}/cros_mark_as_stable_blacklist"
 BLACKLIST=$(cat "$BLACKLIST_FILE")
 if [[ -n "$BLACKLIST" ]]; then
   die "$0 does not support cros_mark_as_stable_blacklist"