Add --transitive flag.

gclient_scm.py

Index: gclient_scm.py
===================================================================
--- gclient_scm.py	(revision 82287)
+++ gclient_scm.py	(working copy)
@@ -126,6 +126,13 @@
 class GitWrapper(SCMWrapper):
   """Wrapper for Git"""
 
+  def GetRevisionDate(self, revision):
+    """Returns the given revision's date in ISO-8601 format (which contains the
+    time zone)."""
+    # return self._Capture(['log', '-n', '1', '--format=%ai',
+    #                            revision + "^.." + revision])
+    return self._Capture(['log', '-n', '1', '--format=%ai'])
+
   @staticmethod
   def cleanup(options, args, file_list):
     """'Cleanup' the repo.
@@ -186,6 +193,12 @@
     if not revision:
       revision = default_rev
 
+    if gclient_utils.IsDateRevision(revision):
+      # Date-revisions only work on git-repositories if the reflog hasn't
+      # expired yet. Use rev-list to get the corresponding revision.
+      revision = self._Capture(['rev-list', '-n 1',
+                                '--before="' + revision[1:-1] + '"',
+                                self._GetCurrentBranch()])
     rev_str = ' at %s' % revision
     files = []
 
@@ -668,6 +681,13 @@
 class SVNWrapper(SCMWrapper):
   """ Wrapper for SVN """
 
+  def GetRevisionDate(self, revision):
+    """Returns the given revision's date in ISO-8601 format (which contains the
+    time zone)."""
+    date = scm.SVN.Capture(['propget', '--revprop', 'svn:date', '-r', revision,
+                            os.path.join(self.checkout_path, '.')])
+    return date.strip()
+
   def cleanup(self, options, args, file_list):
     """Cleanup working copy."""
     self._Run(['cleanup'] + args, options)