/usr/share/postgresql/10/extension/pageinspect--1.0--1.1.sql is in postgresql-10 10.3-1.
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 | /* contrib/pageinspect/pageinspect--1.0--1.1.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION pageinspect UPDATE TO '1.1'" to load this file. \quit
DROP FUNCTION page_header(bytea);
CREATE FUNCTION page_header(IN page bytea,
OUT lsn text,
OUT checksum smallint,
OUT flags smallint,
OUT lower smallint,
OUT upper smallint,
OUT special smallint,
OUT pagesize smallint,
OUT version smallint,
OUT prune_xid xid)
AS 'MODULE_PATHNAME', 'page_header'
LANGUAGE C STRICT;
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