comparison mercurial/revlog.py @ 47285:46b828b85eb7

revlog: update data file record before index rename

When migrating from inline to non-inline data storage, the data file is
recorded initially as zero sized so that it is removed on failure. But
the record has to be updated before the index is renamed, otherwise
data is lost on rollback.

Differential Revision: https://phab.mercurial-scm.org/D10725

47284:21ed126bab53

                        header = self.index.pack_header(header)
                        e = header + e
                    fp.write(e)
                if self._docket is not None:
                    self._docket.index_end = fp.tell()
                # the temp file replace the real index when we exit the context
                # manager

            tr.replace(self._indexfile, trindex * self.index.entry_size)
            nodemaputil.setup_persistent_nodemap(tr, self)

47285:46b828b85eb7

                        header = self.index.pack_header(header)
                        e = header + e
                    fp.write(e)
                if self._docket is not None:
                    self._docket.index_end = fp.tell()

                # There is a small transactional race here. If the rename of
                # the index fails, we should remove the datafile. It is more
                # important to ensure that the data file is not truncated
                # when the index is replaced as otherwise data is lost.
                tr.replace(self._datafile, self.start(trindex))

                # the temp file replace the real index when we exit the context
                # manager

            tr.replace(self._indexfile, trindex * self.index.entry_size)
            nodemaputil.setup_persistent_nodemap(tr, self)