diff mercurial/localrepo.py @ 47280:1766130fe9ba

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/mercurial/localrepo.py	Wed May 19 13:15:00 2021 +0200
+++ b/mercurial/localrepo.py	Wed May 19 13:15:00 2021 +0200
@@ -1690,6 +1690,8 @@
     def _makedirstate(self):
         """Extension point for wrapping the dirstate per-repo."""
         sparsematchfn = lambda: sparse.matcher(self)
+        v2_req = requirementsmod.DIRSTATE_V2_REQUIREMENT
+        use_dirstate_v2 = v2_req in self.requirements
 
         return dirstate.dirstate(
             self.vfs,
@@ -1698,6 +1700,7 @@
             self._dirstatevalidate,
             sparsematchfn,
             self.nodeconstants,
+            use_dirstate_v2,
         )
 
     def _dirstatevalidate(self, node):