/usr/share/postgresql/10/extension/amcheck--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 20 21 22 23 24 | /* contrib/amcheck/amcheck--1.0.sql */
-- complain if script is sourced in psql, rather than via CREATE EXTENSION
\echo Use "CREATE EXTENSION amcheck" to load this file. \quit
--
-- bt_index_check()
--
CREATE FUNCTION bt_index_check(index regclass)
RETURNS VOID
AS 'MODULE_PATHNAME', 'bt_index_check'
LANGUAGE C STRICT PARALLEL RESTRICTED;
--
-- bt_index_parent_check()
--
CREATE FUNCTION bt_index_parent_check(index regclass)
RETURNS VOID
AS 'MODULE_PATHNAME', 'bt_index_parent_check'
LANGUAGE C STRICT PARALLEL RESTRICTED;
-- Don't want these to be available to public
REVOKE ALL ON FUNCTION bt_index_check(regclass) FROM PUBLIC;
REVOKE ALL ON FUNCTION bt_index_parent_check(regclass) FROM PUBLIC;
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