Remove gclient-specific hacks from trychange into gcl.

gclient_utils.py

 # Copyright 2009 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 22 matching lines @@
     self.cwd = cwd
     self.retcode = retcode
     self.stdout = stdout
 
 
 def CheckCall(command, cwd=None):
   """Like subprocess.check_call() but returns stdout.
 
   Works on python 2.4
   """
-  process = subprocess.Popen(command, cwd=cwd,
-                             shell=sys.platform.startswith('win'),
-                             stdout=subprocess.PIPE)
-  output = process.communicate()[0]
-  if process.retcode:
-    raise CheckCallError(command, cwd, process.retcode, output)
+  try:
+    process = subprocess.Popen(command, cwd=cwd,
+                               shell=sys.platform.startswith('win'),
+                               stdout=subprocess.PIPE)
+    output = process.communicate()[0]
+  except OSError, e:
+    raise CheckCallError(command, cwd, errno, None)
+  if process.returncode:
+    raise CheckCallError(command, cwd, process.returncode, output)
   return output
 
 
 def SplitUrlRevision(url):
   """Splits url and returns a two-tuple: url, rev"""
   if url.startswith('ssh:'):
     # Make sure ssh://test@example.com/test.git@stable works
     regex = r"(ssh://(?:[\w]+@)?[-\w:\.]+/[-\w\./]+)(?:@(.+))?"
     components = re.search(regex, url).groups()
   else:
@@ skipping 234 matching lines @@
     raise Error(msg)
 
 
 def IsUsingGit(root, paths):
   """Returns True if we're using git to manage any of our checkouts.
   |entries| is a list of paths to check."""
   for path in paths:
     if os.path.exists(os.path.join(root, path, '.git')):
       return True
   return False