Fix freeze when running from a non-root directory.

git_common.py

 # Copyright 2014 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.
 
 # Monkeypatch IMapIterator so that Ctrl-C can kill everything properly.
 # Derived from https://gist.github.com/aljungberg/626518
 import multiprocessing.pool
 from multiprocessing.pool import IMapIterator
 def wrapper(func):
   def wrap(self, timeout=None):
@@ skipping 387 matching lines @@
   return run('diff', oldrev, newrev, *args)
 
 
 def freeze():
   took_action = False
   key = 'depot-tools.freeze-size-limit'
   MB = 2**20
   limit_mb = get_config_int(key, 100)
   untracked_bytes = 0
 
+  root_path = repo_root()
+
   for f, s in status():
     if is_unmerged(s):
       die("Cannot freeze unmerged changes!")
     if limit_mb > 0:
       if s.lstat == '?':
-        untracked_bytes += os.stat(f).st_size
+        untracked_bytes += os.stat(os.path.join(root_path, f)).st_size
       if untracked_bytes > limit_mb * MB:
         die("""\
           You appear to have too much untracked+unignored data in your git
           checkout: %.1f / %d MB.
 
           Run `git status` to see what it is.
 
           In addition to making many git commands slower, this will prevent
           depot_tools from freezing your in-progress changes.
 
@@ skipping 585 matching lines @@
                       ['HEAD'])
 
 
 def clone_file(repository, new_workdir, link, operation):
   if not os.path.exists(os.path.join(repository, link)):
     return
   link_dir = os.path.dirname(os.path.join(new_workdir, link))
   if not os.path.exists(link_dir):
     os.makedirs(link_dir)
   operation(os.path.join(repository, link), os.path.join(new_workdir, link))