Ensure proper path traversals for linked commands;

sdk/bin/dartanalyzer_developer

 #!/bin/bash
 # Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # This file is used to execute the analyzer by running the jar file.
 # It is a simple wrapper enabling us to have simpler command lines in
 # 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
   DART_CONFIGURATION="ReleaseIA32"
 fi
 
 if [[ `uname` == 'Darwin' ]]; 
 then
   JAR_DIR="$CUR_DIR"/../../xcodebuild/$DART_CONFIGURATION/dartanalyzer
 else
   JAR_DIR="$CUR_DIR"/../../out/$DART_CONFIGURATION/dartanalyzer
 fi 
 
 JAR_FILE="$JAR_DIR/dartanalyzer.jar"
 
 exec java -jar $JAR_FILE --dart-sdk "$SDK_DIR" "$@"