1 files changed, 6 insertions, 0 deletions
diff --git a/tvix/eval/src/io.rs b/tvix/eval/src/io.rs
index 3215e5a7ddb7..4e7404ef9c53 100644
--- a/tvix/eval/src/io.rs
+++ b/tvix/eval/src/io.rs
@@ -41,6 +41,12 @@ pub trait EvalIO {
     /// Read the directory at the specified path and return the names
     /// of its entries associated with their [`FileType`].
     fn read_dir(&self, path: PathBuf) -> Result<Vec<(SmolStr, FileType)>, ErrorKind>;
+
+    /// Returns the root of the store directory, if such a thing
+    /// exists in the evaluation context.
+    fn store_dir(&self) -> Option<String> {
+        None
+    }
 }
 
 /// Implementation of [`EvalIO`] that simply uses the equivalent