124 

   125 def listbookmarks(repo):

   126     # We may try to list bookmarks on a repo type that does not

   127     # support it (e.g., statichttprepository).

   128     if not hasattr(repo, '_bookmarks'):

   129         return {}

   130 

   131     d = {}

   132     for k, v in repo._bookmarks.iteritems():

   133         d[k] = hex(v)

   134     return d

   135 

   136 def pushbookmark(repo, key, old, new):

   137     w = repo.wlock()

   138     try:

   139         marks = repo._bookmarks

   140         if hex(marks.get(key, '')) != old:

   141             return False

   142         if new == '':

   143             del marks[key]

   144         else:

   145             if new not in repo:

   146                 return False

   147             marks[key] = repo[new].node()

   148         write(repo)

   149         return True

   150     finally:

   151         w.release()