Fix bug with parsing capitalized git shas

scm.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.
 
 """SCM-specific utility classes."""
 
 import cStringIO
 import glob
 import logging
 import os
@@ skipping 436 matching lines @@
     sha_only: Fail unless rev is a sha hash.
     """
     # 'git rev-parse foo' where foo is *any* 40 character hex string will return
     # the string and return code 0. So strip one character to force 'git
     # rev-parse' to do a hash table look-up and returns 128 if the hash is not
     # present.
     lookup_rev = rev
     if re.match(r'^[0-9a-fA-F]{40}$', rev):
       lookup_rev = rev[:-1]
     try:
-      sha = GIT.Capture(['rev-parse', lookup_rev], cwd=cwd)
+      sha = GIT.Capture(['rev-parse', lookup_rev], cwd=cwd).lower()
       if lookup_rev != rev:
         # Make sure we get the original 40 chars back.
-        return rev == sha
+        return rev.lower() == sha
       if sha_only:
-        return sha.startswith(rev)
+        return sha.startswith(rev.lower())
       return True
     except subprocess2.CalledProcessError:
       return False
 
   @classmethod
   def AssertVersion(cls, min_version):
     """Asserts git's version is at least min_version."""
     if cls.current_version is None:
       current_version = cls.Capture(['--version'], '.')
       matched = re.search(r'version ([0-9\.]+)', current_version)
@@ skipping 630 matching lines @@
         # revert, like for properties.
         if not os.path.isdir(cwd):
           # '.' was deleted. It's not worth continuing.
           return
         try:
           SVN.Capture(['revert', file_status[1]], cwd=cwd)
         except subprocess2.CalledProcessError:
           if not os.path.exists(file_path):
             continue
           raise