378         extra = self.extra

   378         extra = self.extra

   379         return encoding.tolocal(extra.get(b"branch")), b'close' in extra

   379         return encoding.tolocal(extra.get(b"branch")), b'close' in extra

   380 

   380 

   381 

   381 

   382 class changelog(revlog.revlog):

   382 class changelog(revlog.revlog):

   384         """Load a changelog revlog using an opener.

   384         """Load a changelog revlog using an opener.

   385 

   385 

   386         If ``trypending`` is true, we attempt to load the index from a

   386         If ``trypending`` is true, we attempt to load the index from a

   387         ``00changelog.i.a`` file instead of the default ``00changelog.i``.

   387         ``00changelog.i.a`` file instead of the default ``00changelog.i``.

   388         The ``00changelog.i.a`` file contains index (and possibly inline

   388         The ``00changelog.i.a`` file contains index (and possibly inline

   389         revision) data for a transaction that hasn't been finalized yet.

   389         revision) data for a transaction that hasn't been finalized yet.

   390         It exists in a separate file to facilitate readers (such as

   390         It exists in a separate file to facilitate readers (such as

   391         hooks processes) accessing data before a transaction is finalized.

   391         hooks processes) accessing data before a transaction is finalized.

   392         """

   395         """

   393         if trypending and opener.exists(b'00changelog.i.a'):

   396         if trypending and opener.exists(b'00changelog.i.a'):

   394             indexfile = b'00changelog.i.a'

   397             indexfile = b'00changelog.i.a'

   395         else:

   398         else:

   396             indexfile = b'00changelog.i'

   399             indexfile = b'00changelog.i'

   402             indexfile,

   405             indexfile,

   403             datafile=datafile,

   406             datafile=datafile,

   404             checkambig=True,

   407             checkambig=True,

   405             mmaplargeindex=True,

   408             mmaplargeindex=True,

   406             persistentnodemap=opener.options.get(b'persistent-nodemap', False),

   409             persistentnodemap=opener.options.get(b'persistent-nodemap', False),

   407         )

   411         )

   408 

   412 

   409         if self._initempty and (self.version & 0xFFFF == revlog.REVLOGV1):

   413         if self._initempty and (self.version & 0xFFFF == revlog.REVLOGV1):

   410             # changelogs don't benefit from generaldelta.

   414             # changelogs don't benefit from generaldelta.

   411 

   415