depot_tools: Add git svn find-rev for safesync_url parsing (commonly LKGR link).

gclient.py

 #!/usr/bin/env python
 # Copyright (c) 2011 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.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 905 matching lines @@
       return revision_overrides
     # Do not check safesync_url if one or more --revision flag is specified.
     if not self._options.revisions:
       for s in self.dependencies:
         if not s.managed:
           self._options.revisions.append('%s@unmanaged' % s.name)
         elif s.safesync_url:
           handle = urllib.urlopen(s.safesync_url)
           rev = handle.read().strip()
           handle.close()
-          if len(rev):
-            self._options.revisions.append('%s@%s' % (s.name, rev))
+          scm = gclient_scm.CreateSCM(s.url, s.root.root_dir, s.name)
+          safe_rev = scm.GetUsableRev(rev=rev, options=self._options)
+          if not safe_rev:
+            raise gclient_utils.Error(
+                'Despite our best attempts, we couldn\'t find a useful\n'
+                'safesync_url revision for you.')
+          if self._options.verbose:
+            print('Using safesync_url revision: %s.\n' % safe_rev)
+          self._options.revisions.append('%s@%s' % (s.name, safe_rev))
     if not self._options.revisions:
       return revision_overrides
     solutions_names = [s.name for s in self.dependencies]
     index = 0
     for revision in self._options.revisions:
       if not '@' in revision:
         # Support for --revision 123
         revision = '%s@%s' % (solutions_names[index], revision)
       sol, rev = revision.split('@', 1)
       if not sol in solutions_names:
@@ skipping 579 matching lines @@
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   fix_encoding.fix_encoding()
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: