Ensure proper path traversals for linked commands;

sdk/bin/dartanalyzer_developer

Index: sdk/bin/dartanalyzer_developer
diff --git a/sdk/bin/dartanalyzer_developer b/sdk/bin/dartanalyzer_developer
index b522f56902026a1469a2af28b288a8b808eec2f6..3fadd7585c67d269015a8e9bc8b9d6a9d45f0736 100755
--- a/sdk/bin/dartanalyzer_developer
+++ b/sdk/bin/dartanalyzer_developer
@@ -8,21 +8,19 @@
 # the testing infrastructure.
 set -e
 
-function follow_links() {
-  while [ -h "$1" ]; do
+function link_dir() {
+  a="$1"
+  while [ -h "$a" ]; do
     # On Mac OS, readlink -f doesn't work.
-    1="$(readlink "$1")"
+    a="$(readlink "$a")"
   done
-  echo "$1"
+  # if dir linked, not file, need to follow dir path:
+  echo $(cd $(dirname $a); pwd -P)
 }
 
-# Unlike $0, $BASH_SOURCE points to the absolute path of this file.
-PROG_NAME="$(follow_links "$BASH_SOURCE")"
-
 # Handle the case where the binary dir has been symlinked to.
-CUR_DIR="$(follow_links "$(cd "${PROG_NAME%/*}" ; pwd -P)")"
-
-SDK_DIR="$(cd "${CUR_DIR}/.." ; pwd -P)"
+CUR_DIR="$(link_dir "$0")"
+SDK_DIR="${CUR_DIR}%/*"}
 
 if [ -z "$DART_CONFIGURATION" ];
 then