dirstate-v2: Change the on-disk format when the requirement is enabled For now, the format is the same except with an additional marker at the start. This marker is redundant: for existing repositories it is `.hg/requires` that determines which format to use. For new repositories, it is the new `format.exp-dirstate-v2` config. There is no upgrade or downgrade so far. Most of the changes are about plumbing a boolean through layers of APIs to indicate which format should be used. Differential Revision: https://phab.mercurial-scm.org/D10719

--- a/rust/hg-core/src/dirstate_tree.rs	Wed May 19 13:15:00 2021 +0200
+++ b/rust/hg-core/src/dirstate_tree.rs	Wed May 19 13:15:00 2021 +0200
@@ -1,4 +1,5 @@
 pub mod dirstate_map;
 pub mod dispatch;
+pub mod on_disk;
 pub mod path_with_basename;
 mod status;