Merge branch 'ps/reftable-exclude'

The reftable backend learned to more efficiently handle exclude
patterns while enumerating the refs.

* ps/reftable-exclude:
  refs/reftable: wire up support for exclude patterns
  reftable/reader: make table iterator reseekable
  t/unit-tests: introduce reftable library
  Makefile: stop listing test library objects twice
  builtin/receive-pack: fix exclude patterns when announcing refs
  refs: properly apply exclude patterns to namespaced refs

builtin/receive-pack.c

@@ -340,12 +340,26 @@ static void show_one_alternate_ref(const struct object_id *oid,
 static void write_head_info(void)
 {
 	static struct oidset seen = OIDSET_INIT;
+	struct strvec excludes_vector = STRVEC_INIT;
+	const char **exclude_patterns;
+
+	/*
+	 * We need access to the reference names both with and without their
+	 * namespace and thus cannot use `refs_for_each_namespaced_ref()`. We
+	 * thus have to adapt exclude patterns to carry the namespace prefix
+	 * ourselves.
+	 */
+	exclude_patterns = get_namespaced_exclude_patterns(
+		hidden_refs_to_excludes(&hidden_refs),
+		get_git_namespace(), &excludes_vector);
 
 	refs_for_each_fullref_in(get_main_ref_store(the_repository), "",
-				 hidden_refs_to_excludes(&hidden_refs),
-				 show_ref_cb, &seen);
+				 exclude_patterns, show_ref_cb, &seen);
 	for_each_alternate_ref(show_one_alternate_ref, &seen);
+
 	oidset_clear(&seen);
+	strvec_clear(&excludes_vector);
+
 	if (!sent_capabilities)
 		show_ref("capabilities^{}", null_oid());