Revert "Gclient: Don't check if repository is clean if --force is passed in"

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 535 matching lines @@
 
     # 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
       self._Run(['reset', '--hard', target], options)
 
     if current_type == 'detached':
       # case 0
-      if not options.force:
-        # Don't do this check if nuclear option is on.
-        self._CheckClean(rev_str)
+      self._CheckClean(rev_str)
       self._CheckDetachedHead(rev_str, 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
         # it only when nuclear options are enabled.
         self._Checkout(
             options,
             revision,
-            force=(options.force or options.delete_unversioned_trees),
+            force=(options.force and options.delete_unversioned_trees),
             quiet=True,
         )
       if not printed_path:
         self.Print('_____ %s%s' % (self.relpath, rev_str), timestamp=False)
     elif current_type == 'hash':
       # case 1
       if scm.GIT.IsGitSvn(self.checkout_path) and upstream_branch is not None:
         # Our git-svn branch (upstream_branch) is our upstream
         self._AttemptRebase(upstream_branch, files, options,
                             newbase=revision, printed_path=printed_path,
@@ skipping 1136 matching lines @@
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'theirs-conflict'))
     elif options.manually_grab_svn_rev:
       new_command.append('--force')
       if command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
         new_command.extend(('--accept', 'postpone'))
     elif command[0] != 'checkout' and scm.SVN.AssertVersion('1.6')[0]:
       new_command.extend(('--accept', 'postpone'))
     return new_command