1434 

  1435 class checkambigatclosing(closewrapbase):

  1436     """Proxy for a file object, to avoid ambiguity of file stat

  1437 

  1438     See also util.filestat for detail about "ambiguity of file stat".

  1439 

  1440     This proxy is useful only if the target file is guarded by any

  1441     lock (e.g. repo.lock or repo.wlock)

  1442 

  1443     Do not instantiate outside of the vfs layer.

  1444     """

  1445     def __init__(self, fh):

  1446         super(checkambigatclosing, self).__init__(fh)

  1447         object.__setattr__(self, '_oldstat', util.filestat(fh.name))

  1448 

  1449     def _checkambig(self):

  1450         oldstat = self._oldstat

  1451         if oldstat.stat:

  1452             newstat = util.filestat(self._origfh.name)

  1453             if newstat.isambig(oldstat):

  1454                 # stat of changed file is ambiguous to original one

  1455                 advanced = (oldstat.stat.st_mtime + 1) & 0x7fffffff

  1456                 os.utime(self._origfh.name, (advanced, advanced))

  1457 

  1458     def __exit__(self, exc_type, exc_value, exc_tb):

  1459         self._origfh.__exit__(exc_type, exc_value, exc_tb)

  1460         self._checkambig()

  1461 

  1462     def close(self):

  1463         self._origfh.close()

  1464         self._checkambig()