Make gclient reset use GetUsableRev.

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."""
 
 import collections
 import logging
 import os
 import posixpath
@@ skipping 598 matching lines @@
     default_rev = "refs/heads/master"
     if options.upstream:
       if self._GetCurrentBranch():
         upstream_branch = scm.GIT.GetUpstreamBranch(self.checkout_path)
         default_rev = upstream_branch or default_rev
     _, deps_revision = gclient_utils.SplitUrlRevision(self.url)
     if not deps_revision:
       deps_revision = default_rev
     if deps_revision.startswith('refs/heads/'):
       deps_revision = deps_revision.replace('refs/heads/', self.remote + '/')
+    deps_revision = self.GetUsableRev(deps_revision, options)
 
     if file_list is not None:
       files = self._Capture(['diff', deps_revision, '--name-only']).split()
 
     self._Run(['reset', '--hard', deps_revision], options)
     self._Run(['clean', '-f', '-d'], options)
 
     if file_list is not None:
       file_list.extend([os.path.join(self.checkout_path, f) for f in files])
 
@@ skipping 61 matching lines @@
               ( 'It appears that either your git-svn remote is incorrectly\n'
                 'configured or the revision in your safesync_url is\n'
                 'higher than git-svn remote\'s HEAD as we couldn\'t find a\n'
                 'corresponding git hash for SVN rev %s.' ) % rev)
     else:
       if scm.GIT.IsValidRevision(cwd=self.checkout_path, rev=rev):
         sha1 = rev
       else:
         # May exist in origin, but we don't have it yet, so fetch and look
         # again.
         scm.GIT.Capture(['fetch', self.remote], cwd=self.checkout_path)

[iannucci, 2014/02/20 00:06:25]

Note this doesn't work with cache_dir. I'll do that as a followup CL though
since the gpu bots don't use it.

         if scm.GIT.IsValidRevision(cwd=self.checkout_path, rev=rev):
           sha1 = rev
 
     if not sha1:
       raise gclient_utils.Error(
           ( 'We could not find a valid hash for safesync_url response "%s".\n'
             'Safesync URLs with a git checkout currently require a git-svn\n'
             'remote or a safesync_url that provides git sha1s. Please add a\n'
             'git-svn remote or change your safesync_url. For more info, see:\n'
             'http://code.google.com/p/chromium/wiki/UsingNewGit'
@@ skipping 832 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