1180     def pull(self, remote, heads=None, force=False):

  1180     def pull(self, remote, heads=None, force=False, lock=None):

  1181         l = self.lock()

  1181         mylock = False

  1182 

  1182         if not lock:

  1183         fetch = self.findincoming(remote, force=force)

  1183             lock = self.lock()

  1184         if fetch == [nullid]:

  1184             mylock = True

  1185             self.ui.status(_("requesting all changes\n"))

  1185 

  1186 

  1186         try:

  1187         if not fetch:

  1187             fetch = self.findincoming(remote, force=force)

  1188             self.ui.status(_("no changes found\n"))

  1188             if fetch == [nullid]:

  1189             return 0

  1189                 self.ui.status(_("requesting all changes\n"))

  1190 

  1190 

  1191         if heads is None:

  1191             if not fetch:

  1192             cg = remote.changegroup(fetch, 'pull')

  1192                 self.ui.status(_("no changes found\n"))

  1193         else:

  1193                 return 0

  1194             cg = remote.changegroupsubset(fetch, heads, 'pull')

  1194 

  1195         return self.addchangegroup(cg, 'pull', remote.url())

  1195             if heads is None:

  1196                 cg = remote.changegroup(fetch, 'pull')

  1197             else:

  1198                 cg = remote.changegroupsubset(fetch, heads, 'pull')

  1199             return self.addchangegroup(cg, 'pull', remote.url())

  1200         finally:

  1201             if mylock:

  1202                 lock.release()