636         util.copyfile(

   636         util.copyfile(

   637             srcrepo.vfs.join(b'dirstate'), backupvfs.join(b'dirstate')

   637             srcrepo.vfs.join(b'dirstate'), backupvfs.join(b'dirstate')

   638         )

   638         )

   639 

   639 

   640     assert srcrepo.dirstate._use_dirstate_v2 == (old == b'v2')

   640     assert srcrepo.dirstate._use_dirstate_v2 == (old == b'v2')

   642     srcrepo.dirstate._map.preload()

   641     srcrepo.dirstate._map.preload()

   643     srcrepo.dirstate._use_dirstate_v2 = new == b'v2'

   642     srcrepo.dirstate._use_dirstate_v2 = new == b'v2'

   644     srcrepo.dirstate._map._use_dirstate_v2 = srcrepo.dirstate._use_dirstate_v2

   643     srcrepo.dirstate._map._use_dirstate_v2 = srcrepo.dirstate._use_dirstate_v2

   645     srcrepo.dirstate._dirty = True

   644     srcrepo.dirstate._dirty = True

   646     srcrepo.vfs.unlink(b'dirstate')

   645     srcrepo.vfs.unlink(b'dirstate')