--- a/rust/hg-core/src/repo.rs	Tue Dec 07 17:48:50 2021 -0800
+++ b/rust/hg-core/src/repo.rs	Tue Nov 09 18:17:52 2021 +0100
@@ -417,6 +417,14 @@
         )
     }
 
+    pub fn has_subrepos(&self) -> Result<bool, DirstateError> {
+        if let Some(entry) = self.dirstate_map()?.get(HgPath::new(".hgsub"))? {
+            Ok(entry.state().is_tracked())
+        } else {
+            Ok(false)
+        }
+    }
+
     pub fn filelog(&self, path: &HgPath) -> Result<Filelog, HgError> {
         Filelog::open(self, path)
     }