diff rust/hg-core/src/dirstate_tree/dirstate_map.rs @ 47474:c657beacdf2e

dirstate-v2: Drop cached read_dir results after .hgignore changes

Soon we’ll want the status algorithm to be able to skip `std::fs::read_dir` in
more cases, notabling when listing unknown files but not ignored files.

When ignore patterns change (which we detect by their hash, added to the
dirstate-v2 format in a previous changeset), a formerly-ignored file could
become unknown without changing its parent directory’s modification time.
Therefore we remove any directory mtime from the dirstate, effictively
invalidating the existing caches.

Differential Revision: https://phab.mercurial-scm.org/D10907

--- a/rust/hg-core/src/dirstate_tree/dirstate_map.rs	Tue Jun 22 22:52:08 2021 +0200
+++ b/rust/hg-core/src/dirstate_tree/dirstate_map.rs	Fri Jun 04 15:26:38 2021 +0200
@@ -495,6 +495,19 @@
         }
     }
 
+    pub(super) fn get_or_insert<'tree, 'path>(
+        &'tree mut self,
+        path: &HgPath,
+    ) -> Result<&'tree mut Node<'on_disk>, DirstateV2ParseError> {
+        Self::get_or_insert_node(
+            self.on_disk,
+            &mut self.root,
+            path,
+            WithBasename::to_cow_owned,
+            |_| {},
+        )
+    }
+
     pub(super) fn get_or_insert_node<'tree, 'path>(
         on_disk: &'on_disk [u8],
         root: &'tree mut ChildNodes<'on_disk>,