/usr/share/postgresql/10/extension/timetravel--1.0.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | /* contrib/spi/timetravel--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION timetravel" to load this file. \quit
CREATE FUNCTION timetravel()
RETURNS trigger
AS 'MODULE_PATHNAME'
LANGUAGE C;
CREATE FUNCTION set_timetravel(name, int4)
RETURNS int4
AS 'MODULE_PATHNAME'
LANGUAGE C RETURNS NULL ON NULL INPUT;
CREATE FUNCTION get_timetravel(name)
RETURNS int4
AS 'MODULE_PATHNAME'
LANGUAGE C RETURNS NULL ON NULL INPUT;
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