453         # How much data to read and cache into the raw revlog data cache.

   453         # How much data to read and cache into the raw revlog data cache.

   454         self._chunkcachesize = 65536

   454         self._chunkcachesize = 65536

   455         self._maxchainlen = None

   455         self._maxchainlen = None

   456         self._deltabothparents = True

   456         self._deltabothparents = True

   457         self.index = None

   457         self.index = None

   458         # Mapping of partial identifiers to full nodes.

   459         # Mapping of partial identifiers to full nodes.

   459         self._pcache = {}

   460         self._pcache = {}

   460         # Mapping of revision integer to full node.

   461         # Mapping of revision integer to full node.

   461         self._compengine = b'zlib'

   462         self._compengine = b'zlib'

   462         self._compengineopts = {}

   463         self._compengineopts = {}

   542             )

   543             )

   543 

   544 

   544         indexdata = b''

   545         indexdata = b''

   545         self._initempty = True

   546         self._initempty = True

   546         try:

   547         try:

   547             with self._indexfp() as f:

   551             with self._indexfp() as f:

   548                 if (

   552                 if (

   549                     mmapindexthreshold is not None

   553                     mmapindexthreshold is not None

   550                     and self.opener.fstat(f).st_size >= mmapindexthreshold

   554                     and self.opener.fstat(f).st_size >= mmapindexthreshold

   551                 ):

   555                 ):

   633                 and util.safehasattr(index, 'update_nodemap_data')

   637                 and util.safehasattr(index, 'update_nodemap_data')

   634             )

   638             )

   635             if use_nodemap:

   639             if use_nodemap:

   636                 nodemap_data = nodemaputil.persisted_data(self)

   640                 nodemap_data = nodemaputil.persisted_data(self)

   637                 if nodemap_data is not None:

   641                 if nodemap_data is not None:

   639         except (ValueError, IndexError):

   643         except (ValueError, IndexError):

   640             raise error.RevlogError(

   644             raise error.RevlogError(

   641                 _(b"index %s is corrupted") % self.indexfile

   645                 _(b"index %s is corrupted") % self.indexfile

   642             )

   646             )

   643         self.index, self._chunkcache = d

   647         self.index, self._chunkcache = d