--- a/extensions/timestamps.py	Sun Aug 04 12:58:48 2019 +0200
+++ b/extensions/timestamps.py	Sun Aug 04 17:57:53 2019 +0200
@@ -216,14 +216,28 @@
     if not repo.local():
         return
 
+    #
+    # NOTE: `repo` is not a class but an *instance*
+    #       ``__init__`` has been called already and cannot overwritten
+    #       afterwards.
+    #
+
     class TimestampedRepo(repo.__class__):
 
-        def __init__(self, *args, **kwds):
-            super(TimestampedRepo, self).__init__(*args, **kwds)
-            self._tss_hooktype = None
-            self._tss_hook_pats = None
-            self._tss_from_parents = None
-            ui.warn(b"end init of a TimestampedRepo\n")
+        def _tss_ensure_vars(self):
+            """Ensure that all timestamps variables are set.
+
+            Note that :meth:`__init__` cannot used because
+            :function:`reposetup` is called with an *instance* and not a
+            class.
+
+            """
+            if not hasattr(self, "_tss_initialized"):
+                self._tss_hooktype = None
+                self._tss_hook_pats = None
+                self._tss_from_parents = None
+                self._tss_initialized = True
+                self.ui.debug(_(b"timestamps: variables initialized"))
 
         def commit(self, text=b"", user=None, date=None, match=None,
                    force=False, editor=False, extra=None, **kwds):
@@ -245,7 +259,7 @@
             if match is None:
                 self.ui.status(_("timestamps: handling skipped: no `match' instance given in commit\n"))
                 return None
-
+            self._tss_ensure_vars()
             wctx = self[None]
             tsconfmatch = _gen_matcher_from_tsconfig(wctx)
             if tsconfmatch is not None:
@@ -335,6 +349,7 @@
 
         def _tss_record_pre_data(self, hooktype, **kwds):
             """Called by generic pre-hooks"""
+            self._tss_ensure_vars()
             self._tss_hooktype = hooktype
             self._tss_hook_pats = kwds.get("pats", None)
             self._tss_from_parents = [p.hex() for p in self[None].parents()]
@@ -343,6 +358,7 @@
             """Called on :hg:`hg update` and :hg:`hg merge`
 
             """
+            self._tss_ensure_vars()
             if not self._tss_hooktype \
                    or self._tss_hooktype not in (b"pre-update",
                                                  b"pre-merge"):