[NaCl SDK] Fix build_sdk to prepare for turning on pyauto example testing.

native_client_sdk/src/build_tools/buildbot_common.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Common utilities for all buildbot scripts that specifically don't rely
 on having a full chromium checkout.
 """
 
 import os
 import subprocess
 import sys
 
 SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 SDK_SRC_DIR = os.path.dirname(SCRIPT_DIR)
 SDK_DIR = os.path.dirname(SDK_SRC_DIR)
 SRC_DIR = os.path.dirname(SDK_DIR)
 sys.path.append(os.path.join(SDK_SRC_DIR, 'tools'))
 
 import oshelpers
 
+def IsSDKBuilder():
+  """Returns True if this script is running on an SDK builder.
+
+  False means it is either running on a trybot, or a user's machine.
+
+  Trybot names:
+    naclsdkm-((pnacl-)?linux|mac|windows(32|64))
+
+  Builder names:
+    (pnacl-)?(windows|mac|linux)-sdk-multi(rel)?
+
+    except there are currently no pnacl multirel bots, and
+    pnacl-windows-sdk-multi is actually called pnacl-win-sdk-multi."""
+  return '-sdk-multi' in os.getenv('BUILDBOT_BUILDERNAME', '')
+
+
 def ErrorExit(msg):
   """Write and error to stderr, then exit with 1 signaling failure."""
   sys.stderr.write(msg + '\n')
   sys.exit(1)
 
 
 def BuildStep(name):
   """Annotate a buildbot build step."""
   sys.stdout.flush()
   print '\n@@@BUILD_STEP %s@@@' % name
@@ skipping 71 matching lines @@
 
   subprocess.check_call(
       '%s cp -a public-read %s %s' % (GetGsutil(), filename, full_dst),
       shell=True,
       cwd=cwd)
   url = 'https://commondatastorage.googleapis.com/'\
         '%s/%s' % (bucket_path, filename)
   if step_link:
     print '@@@STEP_LINK@download@%s@@@' % url
     sys.stdout.flush()