Function prune_refs

builtin/fetch.c:1446–1493

}

static int prune_refs(struct display_state *display_state,
		      struct refspec *rs,
		      struct ref_transaction *transaction,
		      struct ref *ref_map)
{
	int result = 0;
	struct ref *ref, *stale_refs = get_stale_heads(rs, ref_map);
	struct strbuf err = STRBUF_INIT;
	struct string_list refnames = STRING_LIST_INIT_NODUP;

	for (ref = stale_refs; ref; ref = ref->next)
		string_list_append(&refnames, ref->name);

	if (!dry_run) {
		if (transaction) {
			for (ref = stale_refs; ref; ref = ref->next) {
				result = ref_transaction_delete(transaction, ref->name, NULL,
								NULL, 0, "fetch: prune", &err);
				if (result)
					goto cleanup;
			}
		} else {
			result = refs_delete_refs(get_main_ref_store(the_repository),
						  "fetch: prune", &refnames,
						  0);
		}
	}

	if (verbosity >= 0) {
		int summary_width = transport_summary_width(stale_refs);

		for (ref = stale_refs; ref; ref = ref->next) {
			display_ref_update(display_state, '-', _("[deleted]"), NULL,
					   _("(none)"), ref->name,
					   &ref->new_oid, &ref->old_oid,
					   summary_width);
		}
		string_list_sort(&refnames);
		refs_warn_dangling_symrefs(get_main_ref_store(the_repository),
					   stderr, "   ", dry_run, &refnames);
	}

cleanup:
	string_list_clear(&refnames, 0);
	strbuf_release(&err);
	free_refs(stale_refs);
	return result;
}

static void check_not_current_branch(struct ref *ref_map)
{