Now trychange can store patches in a Git repo

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 123 matching lines @@
         # these 2 branches instead diffing to upstream.
         m = re.match('^(\w)+\t(.+)$', statusline)
         if not m:
           raise gclient_utils.Error(
               'status currently unsupported: %s' % statusline)
         # Only grab the first letter.
         results.append(('%s      ' % m.group(1)[0], m.group(2)))
     return results
 
   @staticmethod
+  def IsWorkTreeDirty(cwd):
+    return GIT.Capture(['status', '-s'], cwd=cwd) != ''
+
+  @staticmethod
   def GetEmail(cwd):
     """Retrieves the user email address if known."""
     # We could want to look at the svn cred when it has a svn remote but it
     # should be fine for now, users should simply configure their git settings.
     try:
       return GIT.Capture(['config', 'user.email'], cwd=cwd)
     except subprocess2.CalledProcessError:
       return ''
 
   @staticmethod
@@ skipping 229 matching lines @@
     return "%s#%s" % (GIT.GetBranch(cwd), short_sha)
 
   @staticmethod
   def GetCheckoutRoot(cwd):
     """Returns the top level directory of a git checkout as an absolute path.
     """
     root = GIT.Capture(['rev-parse', '--show-cdup'], cwd=cwd)
     return os.path.abspath(os.path.join(cwd, root))
 
   @staticmethod
+  def GetGitDir(cwd):
+    return os.path.abspath(GIT.Capture(['rev-parse', '--git-dir'], cwd=cwd))
+
+  @staticmethod
+  def IsInsideWorkTree(cwd):
+    try:
+      return GIT.Capture(['rev-parse', '--is-inside-work-tree'], cwd=cwd)
+    except (OSError, subprocess2.CalledProcessError):
+      return False
+
+  @staticmethod
   def GetGitSvnHeadRev(cwd):
     """Gets the most recently pulled git-svn revision."""
     try:
       output = GIT.Capture(['svn', 'info'], cwd=cwd)
       match = re.search(r'^Revision: ([0-9]+)$', output, re.MULTILINE)
       return int(match.group(1)) if match else None
     except (subprocess2.CalledProcessError, ValueError):
       return None
 
   @staticmethod
@@ skipping 704 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