--- a/rust/hg-core/src/dirstate_tree/dirstate_map.rs	Tue Jun 14 04:04:08 2022 +0200
+++ b/rust/hg-core/src/dirstate_tree/dirstate_map.rs	Wed Jun 08 19:15:58 2022 +0200
@@ -31,6 +31,13 @@
 /// anymore) is less than this fraction of the total amount of existing data.
 const ACCEPTABLE_UNREACHABLE_BYTES_RATIO: f32 = 0.5;
 
+#[derive(Debug, PartialEq, Eq)]
+/// Version of the on-disk format
+pub enum DirstateVersion {
+    V1,
+    V2,
+}
+
 pub struct DirstateMap<'on_disk> {
     /// Contents of the `.hg/dirstate` file
     pub(super) on_disk: &'on_disk [u8],
@@ -53,6 +60,8 @@
     /// Size of the data used to first load this `DirstateMap`. Used in case
     /// we need to write some new metadata, but no new data on disk.
     pub(super) old_data_size: usize,
+
+    pub(super) dirstate_version: DirstateVersion,
 }
 
 /// Using a plain `HgPathBuf` of the full path from the repository root as a
@@ -434,6 +443,7 @@
             ignore_patterns_hash: [0; on_disk::IGNORE_PATTERNS_HASH_LEN],
             unreachable_bytes: 0,
             old_data_size: 0,
+            dirstate_version: DirstateVersion::V1,
         }
     }
 

--- a/rust/hg-core/src/dirstate_tree/on_disk.rs	Tue Jun 14 04:04:08 2022 +0200
+++ b/rust/hg-core/src/dirstate_tree/on_disk.rs	Wed Jun 08 19:15:58 2022 +0200
@@ -3,6 +3,7 @@
 //! See `mercurial/helptext/internals/dirstate-v2.txt`
 
 use crate::dirstate::TruncatedTimestamp;
+use crate::dirstate_tree::dirstate_map::DirstateVersion;
 use crate::dirstate_tree::dirstate_map::{self, DirstateMap, NodeRef};
 use crate::dirstate_tree::path_with_basename::WithBasename;
 use crate::errors::HgError;
@@ -276,7 +277,9 @@
     metadata: &[u8],
 ) -> Result<DirstateMap<'on_disk>, DirstateV2ParseError> {
     if on_disk.is_empty() {
-        return Ok(DirstateMap::empty(on_disk));
+        let mut map = DirstateMap::empty(on_disk);
+        map.dirstate_version = DirstateVersion::V2;
+        return Ok(map);
     }
     let (meta, _) = TreeMetadata::from_bytes(metadata)
         .map_err(|_| DirstateV2ParseError)?;
@@ -291,6 +294,7 @@
         ignore_patterns_hash: meta.ignore_patterns_hash,
         unreachable_bytes: meta.unreachable_bytes.get(),
         old_data_size: on_disk.len(),
+        dirstate_version: DirstateVersion::V2,
     };
     Ok(dirstate_map)
 }

--- a/rust/hg-core/src/dirstate_tree/status.rs	Tue Jun 14 04:04:08 2022 +0200
+++ b/rust/hg-core/src/dirstate_tree/status.rs	Wed Jun 08 19:15:58 2022 +0200
@@ -4,6 +4,7 @@
 use crate::dirstate_tree::dirstate_map::BorrowedPath;
 use crate::dirstate_tree::dirstate_map::ChildNodesRef;
 use crate::dirstate_tree::dirstate_map::DirstateMap;
+use crate::dirstate_tree::dirstate_map::DirstateVersion;
 use crate::dirstate_tree::dirstate_map::NodeData;
 use crate::dirstate_tree::dirstate_map::NodeRef;
 use crate::dirstate_tree::on_disk::DirstateV2ParseError;
@@ -61,16 +62,29 @@
 
     let (ignore_fn, warnings, patterns_changed): (IgnoreFnType, _, _) =
         if options.list_ignored || options.list_unknown {
-            let mut hasher = Sha1::new();
-            let (ignore_fn, warnings) = get_ignore_function(
-                ignore_files,
-                &root_dir,
-                &mut |pattern_bytes| hasher.update(pattern_bytes),
-            )?;
-            let new_hash = *hasher.finalize().as_ref();
-            let changed = new_hash != dmap.ignore_patterns_hash;
-            dmap.ignore_patterns_hash = new_hash;
-            (ignore_fn, warnings, Some(changed))
+            let (ignore_fn, warnings, changed) = match dmap.dirstate_version {
+                DirstateVersion::V1 => {
+                    let (ignore_fn, warnings) = get_ignore_function(
+                        ignore_files,
+                        &root_dir,
+                        &mut |_pattern_bytes| {},
+                    )?;
+                    (ignore_fn, warnings, None)
+                }
+                DirstateVersion::V2 => {
+                    let mut hasher = Sha1::new();
+                    let (ignore_fn, warnings) = get_ignore_function(
+                        ignore_files,
+                        &root_dir,
+                        &mut |pattern_bytes| hasher.update(pattern_bytes),
+                    )?;
+                    let new_hash = *hasher.finalize().as_ref();
+                    let changed = new_hash != dmap.ignore_patterns_hash;
+                    dmap.ignore_patterns_hash = new_hash;
+                    (ignore_fn, warnings, Some(changed))
+                }
+            };
+            (ignore_fn, warnings, changed)
         } else {
             (Box::new(|&_| true), vec![], None)
         };
@@ -135,7 +149,8 @@
 
     outcome.dirty = common.ignore_patterns_have_changed == Some(true)
         || !outdated.is_empty()
-        || !new_cachable.is_empty();
+        || (!new_cachable.is_empty()
+            && dmap.dirstate_version == DirstateVersion::V2);
 
     // Remove outdated mtimes before adding new mtimes, in case a given
     // directory is both