Subzero: Remove the need for a separate NaCl SDK.

pydir/utils.py

+import os
 import subprocess
 import sys
 
 def shellcmd(command, echo=True):
     if echo: print '[cmd]', command
 
     if not isinstance(command, str):
         command = ' '.join(command)
 
     stdout_result = subprocess.check_output(command, shell=True)
     if echo: sys.stdout.write(stdout_result)
     return stdout_result
+
+def FindBaseNaCl():
+    """Find the base native_client/ directory."""
+    nacl = 'native_client'
+    path_list = os.getcwd().split(os.sep)
+    if nacl not in path_list:
+        return None
+    last_index = len(path_list) - path_list[::-1].index(nacl)
+    return os.sep.join(path_list[:last_index])