--- a/mercurial/cext/parsers.c	Sat Jul 03 03:55:23 2021 +0200
+++ b/mercurial/cext/parsers.c	Sat Jul 03 04:01:17 2021 +0200
@@ -118,6 +118,38 @@
     0                      /* sq_inplace_repeat */
 };
 
+static PyObject *dirstatetuple_v1_state(dirstateTupleObject *self)
+{
+	return PyBytes_FromStringAndSize(&self->state, 1);
+};
+
+static PyObject *dirstatetuple_v1_mode(dirstateTupleObject *self)
+{
+	return PyInt_FromLong(self->mode);
+};
+
+static PyObject *dirstatetuple_v1_size(dirstateTupleObject *self)
+{
+	return PyInt_FromLong(self->size);
+};
+
+static PyObject *dirstatetuple_v1_mtime(dirstateTupleObject *self)
+{
+	return PyInt_FromLong(self->mtime);
+};
+
+static PyMethodDef dirstatetuple_methods[] = {
+    {"v1_state", (PyCFunction)dirstatetuple_v1_state, METH_NOARGS,
+     "return a \"state\" suitable for v1 serialization"},
+    {"v1_mode", (PyCFunction)dirstatetuple_v1_mode, METH_NOARGS,
+     "return a \"mode\" suitable for v1 serialization"},
+    {"v1_size", (PyCFunction)dirstatetuple_v1_size, METH_NOARGS,
+     "return a \"size\" suitable for v1 serialization"},
+    {"v1_mtime", (PyCFunction)dirstatetuple_v1_mtime, METH_NOARGS,
+     "return a \"mtime\" suitable for v1 serialization"},
+    {NULL} /* Sentinel */
+};
+
 PyTypeObject dirstateTupleType = {
     PyVarObject_HEAD_INIT(NULL, 0)      /* header */
     "dirstate_tuple",                   /* tp_name */
@@ -146,7 +178,7 @@
     0,                                  /* tp_weaklistoffset */
     0,                                  /* tp_iter */
     0,                                  /* tp_iternext */
-    0,                                  /* tp_methods */
+    dirstatetuple_methods,              /* tp_methods */
     0,                                  /* tp_members */
     0,                                  /* tp_getset */
     0,                                  /* tp_base */

--- a/mercurial/pure/parsers.py	Sat Jul 03 03:55:23 2021 +0200
+++ b/mercurial/pure/parsers.py	Sat Jul 03 04:01:17 2021 +0200
@@ -64,6 +64,22 @@
         else:
             raise IndexError(idx)
 
+    def v1_state(self):
+        """return a "state" suitable for v1 serialization"""
+        return self._state
+
+    def v1_mode(self):
+        """return a "mode" suitable for v1 serialization"""
+        return self._mode
+
+    def v1_size(self):
+        """return a "size" suitable for v1 serialization"""
+        return self._size
+
+    def v1_mtime(self):
+        """return a "mtime" suitable for v1 serialization"""
+        return self._mtime
+
 
 def gettype(q):
     return int(q & 0xFFFF)
@@ -450,7 +466,14 @@
 
         if f in copymap:
             f = b"%s\0%s" % (f, copymap[f])
-        e = _pack(b">cllll", e[0], e[1], e[2], e[3], len(f))
+        e = _pack(
+            b">cllll",
+            e.v1_state(),
+            e.v1_mode(),
+            e.v1_size(),
+            e.v1_mtime(),
+            len(f),
+        )
         write(e)
         write(f)
     return cs.getvalue()