--- a/rust/hg-pyo3/src/lib.rs	Fri Jan 03 12:51:25 2025 +0100
+++ b/rust/hg-pyo3/src/lib.rs	Fri Jan 03 14:57:53 2025 +0100
@@ -7,6 +7,7 @@
 mod node;
 mod revision;
 mod revlog;
+mod transaction;
 mod store;
 mod util;
 

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rust/hg-pyo3/src/transaction.rs	Fri Jan 03 14:57:53 2025 +0100
@@ -0,0 +1,33 @@
+use hg::{transaction::Transaction, utils::files::get_bytes_from_path};
+use pyo3::{intern, types::PyBytes, PyObject, Python};
+
+/// Wrapper around a Python transaction object, to keep `hg-core` oblivious
+/// of the fact it's being called from Python.
+pub struct PyTransaction {
+    inner: PyObject,
+}
+
+impl PyTransaction {
+    pub fn new(inner: PyObject) -> Self {
+        Self { inner }
+    }
+}
+
+impl Clone for PyTransaction {
+    fn clone(&self) -> Self {
+        Python::with_gil(|py| Self {
+            inner: self.inner.clone_ref(py),
+        })
+    }
+}
+
+impl Transaction for PyTransaction {
+    fn add(&mut self, file: impl AsRef<std::path::Path>, offset: usize) {
+        Python::with_gil(|py| {
+            let file = PyBytes::new(py, &get_bytes_from_path(file.as_ref()));
+            self.inner
+                .call_method(py, intern!(py, "add"), (file, offset), None)
+                .expect("transaction add failed");
+        })
+    }
+}