Call status before reset in gclient sync.

gclient_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.
 
 """Gclient-specific SCM-specific operations."""
 
 from __future__ import print_function
 
 import errno
 import logging
@@ skipping 516 matching lines @@
       if verbose:
         self.Print(remote_output)
 
     self._UpdateBranchHeads(options, fetch=True)
 
     # This is a big hammer, debatable if it should even be here...
     if options.force or options.reset:
       target = 'HEAD'
       if options.upstream and upstream_branch:
         target = upstream_branch
+
+      # Builds can create hard links which update source files' ctimes, causing
+      # git to become confused over what files are out-of-date. Calling
+      # `git status` resynchronizes git and allows `git reset --hard` to not
+      # re-checkout files (and thus forcing unnecessary rebuilds)".
+      self._Run(['status'], options)
+
       self._Run(['reset', '--hard', target], options)
 
     if current_type == 'detached':
       # case 0
       self._CheckClean(revision)
       self._CheckDetachedHead(revision, options)
       if self._Capture(['rev-list', '-n', '1', 'HEAD']) == revision:
         self.Print('Up-to-date; skipping checkout.')
       else:
         # 'git checkout' may need to overwrite existing untracked files. Allow
@@ skipping 628 matching lines @@
     kwargs.setdefault('cwd', self.checkout_path)
     kwargs.setdefault('stdout', self.out_fh)
     kwargs['filter_fn'] = self.filter
     kwargs.setdefault('print_stdout', False)
     env = scm.GIT.ApplyEnvVars(kwargs)
     cmd = ['git'] + args
     if show_header:
       gclient_utils.CheckCallAndFilterAndHeader(cmd, env=env, **kwargs)
     else:
       gclient_utils.CheckCallAndFilter(cmd, env=env, **kwargs)